2 running title: flooding stress signaling 3 corresponding ... · 4 64. 65. abstract . 66. 67....
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1 Running title: Flooding stress signaling 2 3 Corresponding author: Rashmi Sasidharan 4
Address: Padualaan 8, 3584 CH, Utrecht, The Netherlands 5
Telephone number: +31 30 2536871 6
Email: [email protected] 7
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Plant Physiology Preview. Published on November 2, 2017, as DOI:10.1104/pp.17.01232
Copyright 2017 by the American Society of Plant Biologists
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Signal dynamics and interactions during flooding stress. 33 34 Rashmi Sasidharan1, Sjon Hartman1, Zeguang Liu1, Shanice Martopawiro1, Nikita 35 Sajeev1,2, Hans van Veen1, Elaine Yeung1, Laurentius A.C.J. Voesenek1 36 37 1Plant Ecophysiology, Institute of Environmental Biology, Utrecht University, The 38
Netherlands 39
2Molecular Plant Physiology, Institute of Environmental Biology, Utrecht University, The 40
Netherlands 41
42 Summary (200 characters): Flooding triggers several internal changes in plant cells, 43
and interactions between these signals can provide critical information for 44
downstream beneficial gene expression, stress acclimation and survival. 45
46 R.S., S.H., Z.L., S.M., N.S., H.v.V., E.Y. and L.A.C.J.V. all contributed to the writing of the 47 manuscript. 48 49 50 51 52 53
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Footnotes 54 55 Financial sources: This work was supported by grants from the Netherlands 56
Organization for Scientific Research (NWO-ALW No. 822.01.007, NWO-Veni No. 57
863.12.013 and NWO-Crop Sciences grant 867.15.031 to R.S.; NWO-EPS grant 58
831.15.001 to SH; NWO-ALW 824.14.007 to SM, LACJV; a China Scholarship Council 59
grant to ZL) 60
61 Corresponding author: Rashmi Sasidharan ([email protected]) 62
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64 Abstract 65
66
Flooding is detrimental for nearly all higher plants including crops. The compound 67
stress elicited by slow gas exchange and low light levels under water is responsible 68
for both a carbon and an energy crisis ultimately leading to plant death. The 69
endogenous concentrations of four gaseous compounds: oxygen, carbon dioxide, 70
ethylene and nitric oxide, change during submergence of plant organs in water. 71
These gases play a pivotal role in signal transduction cascades leading to adaptive 72
processes such as metabolic adjustments and anatomical features. Of these gases, 73
ethylene is seen as the most consistent, pervasive and reliable signal of early 74
flooding stress most likely in tight interaction with the other gases. The production 75
of reactive oxygen species (ROS) in plant cells during flooding and directly after 76
subsidence, during which the plant is confronted with high light and oxygen levels, is 77
characteristic for this abiotic stress. Low, well-controlled levels of ROS are essential 78
for adaptive signaling pathways, in interaction with the other gaseous flooding 79
signals. On the other hand, excessive uncontrolled bursts of ROS can be highly 80
damaging for plants. A fine-tuned balance is therefore important with a major role 81
for ROS production and scavenging. Our understanding of the temporal dynamics of 82
the four gases and ROS is basal, whereas it is likely that they form a signature 83
readout of prevailing flooding conditions and subsequent adaptive responses. 84
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
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INTRODUCTION 101
102
Global flood risk under climate change has increased dramatically in recent decades 103
(Hirabayashi et al., 2013). In the last 50 years, increasingly frequent and severe 104
flooding events have negatively impacted terrestrial plant life. When flooded, gas 105
exchange is severely restricted between the plant and its environment causing 106
several internal changes in plants. Flooded plant organs can experience a shortage of 107
oxygen (O2) and/or carbon dioxide (CO2), and accumulate high levels of the volatile 108
hormone ethylene. In addition, there are changes in the concentration of O2 derived 109
free radicals, nitric oxide (NO) and reactive oxygen species (ROS) (Bailey-Serres and 110
Voesenek, 2008). The generation, dynamics, concentration and exact balance of 111
these substances in flooded cells depend on the plant organ and type of flooding. 112
We propose that these substances and their interaction during flooding provide 113
plants with a signature readout of prevailing flooded conditions, which elicits an 114
appropriate adaptive response. Here we outline current knowledge regarding the 115
generation, dynamics and interactions of these signals in flooded plants and their 116
influence on downstream responses affecting plant survival. 117
118 SIGNAL GENERATION 119
Tissue level variation in O2 and CO2 120
Light energy drives fixation of CO2 into carbohydrates via photosynthesis. These 121
carbohydrates are vital structural building blocks for plants, and are also respired to 122
generate energy, a process that requires sufficient O2 supply. Flooding-induced 123
reduction in O2 and CO2 hinders respiration and photosynthesis and imposes a 124
severe energy and carbohydrate deficit in submerged plants. O2 and CO2 dynamics 125
are the direct result of consumption, production and diffusive resistance and these 126
factors can vary considerably depending on organ and flooding type (Voesenek and 127
Sasidharan, 2013). 128
Light availability is determined by floodwater clarity and depth. Murky water can 129
almost completely block light reaching the plant surface (Vervuren et al., 2003), thus 130
hampering underwater photosynthesis. Furthermore, limited CO2 access would 131
severely reduce the rate of carbon capture and limit O2 release from the plant 132
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(Mommer and Visser 2005). Studies have shown that in clear water, submerged 133
shoots do not have an O2 deficit (Mommer et al., 2007; Lee et al. 2011; Vashisht et 134
al., 2011; van Veen et al., 2013) and in some cases can even be hyperoxic (Pedersen 135
et al., 2016). Such high O2 levels combined with CO2 limitation most likely lead to 136
increased photorespiration and prevents any net carbon gain for the plant (Mommer 137
et al. 2005a, b). When plants are submerged in dark conditions, internal O2 levels 138
rapidly decline as a result of respiratory consumption and limited diffusion from the 139
environment. However, shoot internal O2 levels rarely decline to zero (Vashisht et 140
al., 2011, Winkel et al., 2013). Though gas diffusion is impaired, the leaf tissue is 141
surrounded by water that usually has close to ambient O2 levels. The flat leaf, 142
sometimes in combination with gas films then does allow some gas exchange 143
(Pedersen et al., 2009; Verboven et al., 2014). 144
Roots experience a completely different environment when submerged. Flooded 145
soils are rapidly depleted of O2, as water fills existing airspaces and respiring 146
microorganisms and roots consume available O2 leading to an anoxic environment. 147
Heterotrophic roots invariably will rapidly consume internal O2 and by virtue of their 148
cylindrical anatomy have less favorable environmental gas exchange (Greenway et 149
al. 2006). Arabidopsis roots were hypoxic even under well-drained conditions, but 150
when submerged became anoxic within 15 minutes (Vashisht et al., 2011). This was 151
alleviated by submerging in light conditions, indicating that even in Arabidopsis, 152
internal shoot to root O2 diffusion is important. This highlights the importance of 153
tissue porosity, tissue tortuosity and diffusion distance for root O2 supply (Colmer, 154
2003). CO2 from respiring roots and rhizosphere microorganisms can lead to a high 155
CO2 environment. This could possibly influence roots via an effect on intracellular pH 156
and some key metabolic enzymes (Greenway et al., 2006). 157
Oxygen sensing was recently shown to occur via proteolysis of group VII Ethylene 158
Response Factors (ERFVIIs). ERFVIIs are important transcriptional regulators of 159
hypoxia responses via control of hypoxia adaptive gene expression (Hinz et al., 2010; 160
Licausi et al., 2011; Gibbs et al., 2011; Gasch et al., 2015). Studies in Arabidopsis have 161
revealed that the presence of a characteristic N-terminal motif makes ERFVIIs direct 162
targets of the N-end rule pathway of proteolysis where, in the presence of both 163
ambient NO and O2 these proteins are ubiquitinated and degraded (Licausi, et al. 164
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2011; Gibbs et al., 2011; Gibbs et al., 2014). When either the NO or O2 concentration 165
declines, ERFVIIs are no longer flagged for ubiquitination, accumulate and activate 166
downstream target genes, including those required for fermentation. 167
168 Starvation strongly influences flooding responses 169
During complete submergence plants experience a strong decline in energy and 170
carbon availability. This is due to reduced photosynthesis, either through a lack of 171
light or reduced rate of CO2 diffusion, and due to impaired respiration through 172
reduced oxygen availability. Plants can sense and integrate a variety of signals 173
relaying cellular energy and carbon status. This includes sucrose sensing via 174
trehalose metabolism (Schluepmann et al., 2003), glucose via Hexokinase1 (Moore 175
et al., 2003) and fructose via NAC089 (Li et all, 2011). These responses are tightly 176
balanced by the opposing actions of the conserved kinases sucrose-non-fermenting-177
1-related protein kinase-1 (SnRK1) during starvation and by target of rapamycin 178
(TOR) Kinase during energy abundance (Lastdrager et al., 2014; Baena-Gonzalez and 179
Hansson, 2017). These central regulators maintain energy homeostasis and stress 180
acclimation through major transcriptomic, translatomic and metabolic 181
reprogramming (Lastdrager et al., 2014). Low energy signaling is intricately 182
connected with plant hormone signaling pathways, especially ABA and ethylene 183
(Finkelstein and Gibson, 2002; Cho et al., 2010; Ljung et al., 2015). 184
Starvation leads to a downregulation of energetically expensive secondary metabolic 185
processes and protein translation, a crucial adaptation to prioritize energy 186
expenditure during flooding (Branco-Price et al., 2008; Edwards et al., 2012; 187
Sorenson and Bailey Serres, 2014). Arabidopsis plants experiencing starvation in 188
darkness had a highly similar transcriptomic response as those under submerged 189
conditions (van Veen et al. 2016; Lee et al. 2011). This indicates that low energy 190
signaling occurs via a generic signaling mechanism regardless of the origin of the 191
starvation stress. 192
However, the regulatory action of the low energy sensing machinery might not 193
always be beneficial during flooding. For instance, some rice accessions can 194
germinate under anoxic conditions, but require a large amount of readily available 195
sugars to do so (Magneschi and Perata, 2008; Loreti et al. 2016). One way these 196
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sugars are perceived is by trehalose-6-phosphate (T6P) levels, which directly reflects 197
sucrose availability (Yadav et al. 2014). However, in rice high T6P levels prevent 198
starch degradation via inhibition of SnRK1 activity, an undesirable process during 199
germination. This is avoided by T6P degradation via the induction of a T6P 200
phosphatase in varieties that harbor a specific T6P phosphatase gene (OsTPP7). 201
Active T6P removal reduces the sensitivity of rice blind to its available sugar levels 202
and facilitates starch mobilization to create a strong flux of sugars that fuels 203
anaerobic germination (Kretzschmar et al., 2015). Energy levels during anoxic 204
establishment of plants can thus be surprisingly high (Ishizawa et al., 1999). and The 205
regulation of energy signaling, e.g. trehalose metabolism, components occurs during 206
flooding in several species and tissues (Jung et al., 2010, van Veen et al., 2013; 207
Kretzschmar et al., 2015; Akman et al., 2017) suggesting that adjusting sensitivity to 208
sugar and energy signaling could be an essential part of regulating flooding 209
responses. 210
211 212 Ethylene invariably accumulates to high concentrations 213
All plant cells, except those of a few aquatic plant species with a permanently 214
submerged life style (Voesenek et al., 2015), are capable of synthesizing ethylene 215
and endogenous levels are determined by production rates and loss via diffusion to 216
the atmosphere. Ethylene biosynthesis starts with the conversion of the amino acid 217
methionine to S-Adenosyl-L-Methionine (SAM) by SAM synthetase. The enzyme 1-218
aminocyclopropane-1-carboxylic acid (ACC) synthase then catalyzes the production 219
of ACC from SAM followed by its oxidation to ethylene by ACC oxidase in a reaction 220
requiring O2. Both ACC synthase (ACS) and ACC oxidase (ACO) belong to large 221
multigene families and are regulated by various external and internal cues to control 222
ethylene production. In cells of flooded cells organs, endogenous ethylene levels 223
rapidly increase mainly due to hampered diffusion to the surrounding water. 224
Ethylene accumulates to high physiologically saturating levels in several plant species 225
in flooded shoots and roots (Voesenek and Sasidharan, 2013). Ethylene can reach 226
levels that are 20 fold (1 µlL-1) higher than non-submerged tissue within 1 hour 227
(Figure 1). Upon soil flooding, root ethylene levels were variable across species 228
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determined by production rates and diffusion capacity. Wetland species possessing 229
aerenchymatous tissue could vent entrapped ethylene and had lower accumulated 230
ethylene in flooded roots (Visser and Pierik, 2007). An overview of ethylene 231
concentrations in various plant species and organs upon flooding can be found in 232
Voesenek and Sasidharan (2013). Ethylene accumulation is not known to be affected 233
directly by changes in light levels during flooding. Thus unlike O2 and CO2 levels that 234
can be highly variable and influenced by several factors, high ethylene 235
concentrations are the most consistent, pervasive and reliable signal conveying early 236
flooding (Voesenek and Sasidharan, 2013; Sasidharan et al., 2015). Since ACC 237
conversion to ethylene requires O2, ethylene production cannot occur under true 238
anoxic conditions and it is therefore not a signal in these extreme situations. 239
240
Nitric oxide metabolism 241
Nitric oxide (NO) is a short-lived, highly reactive molecule regulating several plant 242
developmental and stress responses (Astier et al., 2011; Manjunatha et al., 2012; 243
Farnese et al., 2016). Plants regulate endogenous NO levels via control of 244
biosynthesis and scavenging. The regulation of NO biosynthesis in plants is poorly 245
understood. Several studies suggest that the main source of NO production is via 246
enzymatic and non-enzymatic reduction of nitrite (NO2-) (Planchet et al., 2005; Mur 247
et al, 2013; reviewed in Chamizo-Ampudia et al., 2017). Nitrite production is highly 248
dependent on nitrate reductase (NR) activity. The dependency of NO production on 249
nitrite availability, makes NR the major player in NO production (Magalhaes et al., 250
2000; Gupta and Kaiser, 2010; Gupta et al., 2011; Chamizo-Ampudia et al. 2017) 251
Removal of synthesized NO can occur via multiple reactions. NO can react chemically 252
with O2 to produce NO2- and NO3
- or with ROS to form additional Reactive Nitrogen 253
Species (RNS) (Delledone et al., 2001; Chamizo-Ampudia et al., 2017). NO can be 254
scavenged by glutathione (GSH) to produce S-nitrosylated glutathione (GSNO) 255
(Wilson et al., 2008; Frungillo et al., 2014). Finally, phytoglobins (previously called 256
Class I non-symbiotic hemoglobins) (Voesenek et al., 2016) use O2 to dioxygenate NO 257
in the plant cell to form nitrate (Hebelstrup et al., 2006 & 2012; Hill, 2012). 258
There is limited and contrasting data regarding temporal and spatial NO dynamics in 259
flooded plants. In Arabidopsis and cotton, NO emissions declined in the aerial plant 260
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tissues, while emissions increased in three waterlogged deciduous tree species 261
(Magalhaes et al., 2000; Copolovici and Uiinemets, 2010; Zhang et al., 2017). 262
However, NO dynamics under hypoxia have been studied more extensively. Both 263
cellular and exogenous NO levels increased in various plant species during hypoxia 264
(Planchet et al., 2005; Mugnai et al., 2012; Gupta and Igamberdiev, 2016). This NO 265
burst during hypoxia is thought to result from enhanced NR activity and nitrite 266
accumulation providing a substrate for NO production (Planchet et al., 2005; Mugnai 267
et al., 2012; Gupta and Igamberdiev, 2016). In roots, NO bursts could be specific to 268
the transition and division zone and dependent on hypoxia sensing in the root apex 269
(Mugnai et al., 2012) (Figure 1). Post-translational modification of NR via 270
phosphorylation effectively inactivated NO synthesis in tobacco (Lea et al., 2004), 271
and this phosphorylation may be impaired under hypoxic conditions leading to 272
higher NR activity. NR activity is also lowered under reduced light conditions (Nemie-273
Feyissa et al., 2013), with potential implications for NR activity during submergence 274
in turbid waters. In conclusion, the temporal and spatial dynamics of NO, and 275
therefore its effects, are likely dependent on the conditions of flooding. 276
277
ROS metabolism 278
ROS are highly reactive, chemical species formed by the stepwise reduction of 279
molecular O2. ROS include superoxide (O2.-), singlet oxygen (1O2), hydrogen peroxide 280
(H2O2) and the hydroxyl radical (OH.) (Demidchik, 2015; Mittler, 2017). ROS are by-281
products of various metabolic pathways and are produced enzymatically or non-282
enzymatically. Non-enzymatic ROS production can occur in chloroplasts and 283
mitochondria via electron transport chains (ETC). In both organelles, the occasional 284
leakage of electrons to O2 during electron transport can result in the partial 285
reduction of O2 generating O2.- which subsequently give rise to other more reactive 286
ROS (Møller, 2001; Asada, 2006). Enzymatic ROS production can occur at several 287
sites within the cell including peroxisomes, cell walls, plasma membrane and 288
apoplast (Mignolet-Spruyt et al., 2016). Peroxisomes are the site of several oxidative 289
metabolic processes that can generate ROS, such as β-oxidation of fatty acids and 290
photorespiration (del Río and López-Huertas, 2016). In the peroxisome, O2.- is 291
formed by xanthine oxidase (Bolwell and Wojtaszek, 1997), whilst glycolate oxidase 292
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catalyzes H2O2 generation (del Río and López-Huertas, 2016). Another enzymatic ROS 293
source is plasma membrane bound NADPH oxidases, or respiratory burst oxidase 294
homologs (RBOHs). RBOHs reduce extracellular O2 to O2.- using cytosolic NADPH 295
(Møller, 2001). Plants counter excessive ROS production with an efficient scavenging 296
machinery. This consists of ROS scavenging enzymes like superoxide dismutase 297
(SOD), ascorbate peroxidase (APX), catalase (CAT), glutathione peroxidase (GPX) and 298
antioxidant molecules like glutathione, ascorbic acid and α-tocopherol (Mittler et al., 299
2004; Steffens et al., 2013). 300
Considering that ROS originate from O2, it is expected that under flooding-induced 301
hypoxic conditions, ROS production is also restricted. However, several studies 302
report increased ROS accumulation under hypoxia/anoxia (Figure 1) (Pucciariello et 303
al., 2012; Chang et al., 2012; Paradiso et al., 2016). Under O2 deprivation, ROS 304
production likely still occurs in the mitochondria, chloroplasts and peroxisomes. 305
Anoxia inhibits the mitochondrial ETC resulting in the formation of mitochondrial 306
ROS (Chang et al., 2012), and chloroplastic ROS generation might occur via a similar 307
process. ROS could also be formed by peroxisomes during flooding in light. When 308
terrestrial plants photosynthesize underwater, photorespiration rates can increase 309
(Mommer and Visser, 2005). Photorespiration is one route via which peroxisomal 310
H2O2 production can be boosted (del Río and López-Huertas, 2016). Furthermore, 311
the antioxidant system can be negatively affected by hypoxia (Lasanthi-Kudahettige 312
et al., 2007), disrupting the tightly regulated balance between scavenging and 313
production. During flooding and hypoxia, ROS is also produced in a regulated 314
manner via RBOHs. In Arabidopsis, RBOHD is specifically upregulated during flooding 315
and hypoxia and is one of the core hypoxia genes (Mustroph et al., 2009; Pucciariello 316
et al., 2012; Yao et al., 2017). ROS signaling via regulated ROS production is 317
considered an important component of hypoxia signaling and adaptive responses to 318
flooding (Steffens et al., 2012; Pucciariello et al. 2012; Yamauchi et al., 2013; Gonzali 319
et al, 2015; Yamauchi et al., 2017). 320
321 SIGNAL INTERACTIONS 322
Ethylene and hypoxia signaling interact with NO 323
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The interplay between ethylene and NO has often been described but has rarely 324
been mechanistically investigated. However, chemical or genetic impairment of one 325
of these pathways often affects the other and impacts plant responses (Asgher et al., 326
2016; Magalhaes et al., 2000; Manjunatha et al., 2012). Like ethylene, NO could also 327
accumulate to higher concentrations in flooded tissues due to restricted gas 328
diffusion. However, since NO is highly reactive and short-lived, accumulation is likely 329
limited without the additional hypoxic NO burst described earlier. Accordingly, 330
waterlogged Arabidopsis and cotton plants showed elevated ethylene emission and 331
signaling, respectively, but declining NO emission from aerial tissues (Magalhaes et 332
al., 2000; Zhang et al., 2017). In addition, exogenous NO application increased 333
ethylene production in various plants species, possibly via enhanced ACO activity 334
(Magalhaes et al., 2000; Manac’h-Little et al., 2005). On the other hand, NO levels 335
declined in ethylene-deficient or constitutive mutants (Magalhaes et al., 2000; Liu et 336
al., 2017). Thus both gases may affect each other under the conditions that vary over 337
the course of a flooding event. 338
The NO scavenging phytoglobins could potentially facilitate crosstalk between NO 339
and ethylene. However, conclusive mechanistic evidence is lacking. Phytoglobin 340
mRNA levels increased under waterlogging and hypoxic conditions in multiple plant 341
species (Hebelstrup et al., 2012; van Veen et al., 2013; Mira et al., 2016). Phytoglobin 342
silencing in Arabidopsis and maize, increased ethylene and NO emissions, and 343
upregulated ethylene biosynthesis and signaling genes (Hebelstrup et al., 2012; Mira 344
et al., 2016). Interestingly, NO also enhanced phytoglobin mRNA abundance in rice, 345
cotton and spinach (Ohwaki et al., 2005; Qu et al., 2006; Bai et al., 2016) hinting at a 346
feedback mechanism. In the wetland species Rumex palustris, phytoglobin transcript 347
levels increased following a short ethylene treatment and could potentially reduce 348
NO in these tissues (van Veen et al., 2013). Taken together, phytoglobins modulate 349
NO and ethylene levels, while these gases in turn also affect phytoglobin abundance. 350
Crosstalk and feedback loops between NO and ethylene may also occur at 351
the level of ERFVIIs. ERFVII stability and action strongly depend on NO and O2 levels 352
(Licausi, et al. 2011; Gibbs et al., 2011; Gibbs et al., 2014). When either the NO or O2 353
concentration declines, ERFVIIs accumulate and facilitate downstream target gene 354
transcription. Interestingly, ERFVII regulated genes that contain the hypoxia-355
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responsive promoter element include multiple ethylene signaling genes and the NO 356
scavenging phytoglobin, HEMOGLOBIN1 (HB1) (Gasch et al., 2015). In addition, 357
expression of several ERFVIIs is also regulated by ethylene (Chang et al., 2013). In 358
conclusion, ERFVII abundance is regulated by NO, O2 and possibly ethylene, while 359
ERFVII action in turn can induce positive feedback loops for ethylene biosynthesis 360
and NO scavenging (Gasch et al., 2015). 361
362
The functional role of NO 363
While exact NO dynamics in flooded plants remain vague, it is clear that an NO 364
upsurge during hypoxia has functional implications for survival (Mugnai et al., 2012; 365
Gupta and Igamberdiev, 2016; Mira et al., 2016). For instance, chemically blocking 366
the hypoxia-induced NO burst at the onset of hypoxia strongly impaired hypoxia 367
survival in maize root tips (Mugnai et al., 2012). In addition to its role in regulating 368
ERFVII abundance, NO may also exert a regulatory role during flooding or hypoxia, by 369
post-translational modification (PTM) of proteins via S- or metal-nitrosylation and 370
tyrosine (Tyr) nitration (Reviewed by Astier et al., 2011; León et al., 2016). 371
Exogenous NO application in Arabidopis effectively S-nitrosylated proteins involved 372
in respiration, metabolism, signaling and stress responses (Lindermair et al., 2005; 373
Astier et al., 2011; León et al., 2016). S-nitrosylated proteins potentially involved in 374
flooding signaling and adaptation include ERFVIIs, cytochrome c oxidase (COX), 375
aconitase, phytoglobins and the H2O2 scavenger APX1 (Millar et al., 1996; Perazzolli 376
et al., 2004; Gupta et al., 2012; Gibbs et al., 2014; Begara-Morales et al., 2016). 377
Indeed, some reports indicate that an NO burst may inhibit COX activity (Millar et al., 378
1996; Brown, 2001). On the other hand, S-nitrosylation and therefore inhibition of 379
aconitase leads to enhanced alternative oxidase (AOX) activity under hypoxia in 380
Arabidopsis (Gupta et al., 2012). This altered bioactivity of COX and AOX by NO 381
suggests a role in tight regulation of respiration and O2 consumption in plant 382
mitochondria during hypoxia. 383
Phytoglobins mediate NAD(P)+ regeneration under hypoxia via the so-called 384
phytoglobin/NO cycle (Perazzolli et al., 2004; Igamberdiev et al., 2005; Gupta and 385
Igamberdiev, 2016). In the absence of O2, plant mitochondria can keep the electron 386
transport functional using nitrite as the electron acceptor (Gupta et al., 2005; Gupta 387
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and Igamberdiev, 2011). This nitrite reduction to NO in the ETC recycles NAD(P)H to 388
NAD(P)+ and leads to some ATP production. This process in addition to the ATP 389
generated by fermentation retains the energy status of cells as long as sugar 390
availability is sufficient. The produced NO can be scavenged by phytoglobins via S-391
nitrosylation and this is thought to contribute to regeneration of NAD(P)+ and 392
nitrate, in turn fueling glycolysis and ATP production. The observed induction of 393
phytoglobin transcripts by ethylene might enhance this process in some plant 394
species when submerged (van Veen et al., 2013). Finally, the importance of 395
phytoglobins for hypoxia acclimation is highlighted in various studies. Phytoglobin-396
impaired mutants showed reduced hypoxia tolerance, while over-expression 397
enhanced tolerance in multiple plant species (Dordas et al., 2003; Mira et al., 2016). 398
In conclusion, the phytoglobin/NO cycle shows a crucial strategy of adaptation 399
leading to a retained energy status under hypoxia. 400
401
ROS-mediated hypoxia acclimation 402
ROS production and signaling during hypoxia is considered essential for stress 403
acclimation. In hypoxic Arabidopsis seedlings, RBOHD mRNA levels are strongly 404
upregulated (Pucciariello et al., 2012; Yang and Hong, 2015). Elevated H2O2 levels in 405
Arabidopsis seedlings shortly after the imposition of anoxia (Baxter-Burrell et al., 406
2002; Pucciariello et al., 2012), is linked to RBOH-mediated electron flow from 407
NADPH to O2 resulting ultimately in H2O2 generation. Accordingly, this hypoxic H2O2 408
increase is absent and survival compromised in rbohD seedlings or upon chemical 409
inhibition of RBOH activity. RBOH activity and therefore H2O2 production during O2 410
deprivation is regulated by the activity of at least two other hypoxia-inducible 411
proteins: HYPOXIA RESPONSIVE UNIVERSAL STRESS PROTEIN 1 (HRU1) and RHO (Ras 412
homologous)-RELATED PROTEIN FROM PLANTS 2 (ROP2) (Baxter- Burrel et al., 2002; 413
Gonzali et al., 2015). 414
Hypoxic conditions convert ROP2 to its active form GTP-ROP2 and activate RBOH-415
mediated H2O2 production. The subsequent ROS burst triggers the expression of 416
downstream beneficial targets including fermentation genes (eg. ALCOHOL 417
DEHYDROGENASE (ADH)) required for hypoxia acclimation. However, ROP2-triggered 418
H2O2 signaling also upregulates ROP guanosine triphosphatase (GTPase) activating 419
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protein 4 (ROPGAP4), a negative regulator of ROP2. ROPGAP4-mediated inactivation 420
of ROP2 consequently dampens RBOHD-mediated ROS production. In ropgap4 421
mutants or in lines expressing a constitutively active form of ROP2, ADH expression 422
and activity was increased but tolerance was reduced (Baxter-Burrel et al., 2002). 423
Thus negative feedback inhibition of ROP2 and tight regulation of ROS production 424
plays a role in preventing oxidative stress and improving hypoxia tolerance. 425
Another hypoxia-inducible gene and ERFVII target regulating RBOH-mediated ROS 426
production is HRU1. HRU1 interacts with ROP2-GTP and RBOHD both in vitro and in 427
vivo, and hru1 mutants lack the hypoxic H2O2 burst observed in wild-type 428
Arabidopsis seedlings. HRU1 can exist as cytosolic HRU1-HRU1 dimers or monomers 429
that can take another interacting protein partner. The balance between these 430
dimers and monomers is essential for the control of ROS production. A shift in 431
balance towards HRU1 monomers might be favored during hypoxia, because under 432
these conditions HRU1 translocation to the plasma membrane was observed. Here it 433
may form a HRU1–ROP2–RBOHD complex and influence ROS production (Gonzali et 434
al., 2015). Together these findings indicate that apoplastic ROS production is a tightly 435
regulated process involving multiple protein interactions and is essential for hypoxia 436
acclimation and survival. 437
438
Functional ROS-ethylene interactions 439
Plants growing in flooded environments use morphological adaptations to improve 440
internal aeration and avoid flooding-induced hypoxia. These traits include formation 441
of gas filled voids or aerenchyma in existing root/shoots or shoot-borne, 442
aerenchyma-rich adventitious roots. Aerenchyma either constitutive or induced, 443
improves gas diffusion between flooded and non-flooded plant parts and permit 444
aerobic respiration to continue in affected organs (Voesenek and Bailey-Serres, 445
2015). Several studies have revealed that interactions between ROS and ethylene 446
signaling regulate lysigenious (formed by regulated cortical cell death) aerenchyma 447
development and adventitious roots (Yamauchi et al., 2013; Yamauchi et al., 2017; 448
Steffens et al., 2012). 449
Ethylene-induced formation of lysigenous aerenchyma under O2-deprived 450
conditions, via control of ROS production has been demonstrated in species such as 451
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rice, wheat and maize (Yamauchi et al., 2013; Takahashi et al., 2015; Yamauchi et al., 452
2017). Stem aerenchyma in deepwater rice internodes required ethylene-mediated 453
ROS accumulation to induce parenchymal cell death (Steffens et al., 2012). In rice 454
adventitious roots, stagnant flooding increased ethylene levels due to a combination 455
of restricted diffusion and enhanced biosynthesis. This increased transcript 456
abundance and subsequently activity of RBOHH. Interestingly, the strongest RBOHH 457
expression was in the root cortical cells and corresponded with ROS accumulation 458
and programmed cell death (PCD) only in these cells. Accordingly, in adventitious 459
roots of CRISPR/Cas9 RBOHH knockouts, H2O2 and aerenchyma were significantly 460
reduced under stagnant conditions (Yamauchi et al., 2017). Considering that 461
ethylene accumulates in all cells, the question arises as to how cellular specificity is 462
achieved for ROS generation and subsequent cell death. The answer might lie in the 463
distinct characteristics (thinner cell walls, higher ROS, low starch) and higher 464
ethylene sensitivity of pre-aerenchymatous cells (Justin and Armstrong, 1991; Visser 465
and Bögemann, 2006; Steffens et al., 2012). In situ staining of stagnant rice roots 466
showed O2.- accumulation and a radial expansion of collapsed cells starting from the 467
mid-cortical cells and spreading to the neighbouring cells within the cortex. RBOHH 468
mediated O2.- could be the signal propagating cellular collapse to adjacent cells 469
(Yamauchi et al., 2017). Such a systemic signaling role has been demonstrated in 470
Arabidopsis where RBOHD-generated H2O2 stimulated RBOHD activity in adjacent 471
cells resulting in an auto propagating wave of ROS production (Miller et al. 2009; 472
Mittler et al., 2011). Whether such a systemic signal transmission occurs during 473
aerenchyma formation is yet to be confirmed. 474
Interactions between ethylene and ROS signaling also regulates adventitious root 475
growth and emergence in rice. Preceding adventitious root emergence, the 476
epidermal cells overlying adventitious root primordia have to die (Steffens et al., 477
2012). Ethylene stimulates this epidermal cell death by promoting RBOH-mediated 478
H2O2 accumulation. In epidermal cells that undergo PCD, ethylene also reduced 479
expression of Metallothionein2b (MT2b), a ROS scavenger (Steffens et al., 2012). 480
Accordingly, enhanced constitutive epidermal cell death was observed in MT2b 481
knockdown mutants, which also had high H2O2 levels. Ethylene and ROS signaling 482
also mediate adventitious root growth regulation. Ethylene-induced adventitious 483
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root growth clearly requires ROS, since chemical manipulation of ROS levels clearly 484
affected adventitious root formation. However, this was highly specific to the nature 485
of ROS perturbation. For example, chemical inhibition of CAT and RBOH activity 486
clearly restricted ethylene-induced adventitious root growth. In contrast, 487
adventitious root growth was unaffected in MT2b knockdown lines with enhanced 488
H2O2 (Steffens et al., 2012). Adventitious root growth and emergence needs to be 489
precisely coordinated with epidermal cell death to protect the emerging root 490
primordium. This requires accurate signaling of the location where cell death should 491
occur. Ethylene and ROS alone could elicit local epidermal cell death only when a 492
mechanical stimulus (the physical pressure of the emerging root) was also present. 493
According to the current hypothesis, adventitious root formation requires ethylene-494
mediated ROS production in both the adventitious root primordium and the 495
overlying epidermal cells. ROS accumulation in the adventitious root primordium 496
promotes growth. The growing root exerts a mechanical force on specific epidermal 497
cells above it, whereby mechanical signaling and ethylene-induced ROS signaling 498
together trigger PCD (Steffens et al., 2012). 499
500
SIGNAL GENERATION AND INTERACTION UPON RE-AERATION 501
When floodwaters subside, submergence-mediated damage is further compounded. 502
Plants are re-exposed to higher O2 concentrations and increased light intensity, 503
resulting in further oxidative stress through a burst of ROS production (Fukao et al., 504
2011; Luo et al., 2012; Alpuerto et al., 2016) (Figure 1). Post-submergence ROS 505
damage is parallel to oxidative damage during hypoxic conditions, in which ROS 506
disrupts the photosynthetic apparatus (Luo et al., 2011; Panda and Sarkar, 2012; 507
Alpuerto et al., 2016) and consequently hinders photosynthetic recovery and 508
replenishment of carbohydrate reserves (Bhowmick et al., 2014; Gautam et al., 509
2017). During re-oxygenation and re-illumination, ROS and photo-inhibition can 510
further trigger desiccation stress (Setter et al., 2010), leaf senescence (Gautam et al., 511
2016; Liu and Jiang, 2016) and cell death (Tamang et al., 2014). Upon re-512
oxygenation, ROS accumulation likely occurs due to a combination of reduced 513
scavenging capacity and increased ROS production (Rhoads et al., 2006; Blokhina and 514
Fagerstedt, 2010; Shapiguzov et al., 2012). Excessive ROS accumulation is associated 515
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18
with high-energy demands of reactivated mitochondrial and photosynthetic 516
metabolism due to re-oxygenation and re-illumination, causing electron leakage in 517
ETCs and proton leakage in mitochondrial matrixes (Elstner and Osswald, 1994; 518
Smirnoff, 1995; Roach et al., 2015). Excess O2 reacting with ROS-related byproducts 519
produced during hypoxic conditions can also trigger additional ROS formation. 520
While ethylene is well established as a signal triggering adaptive responses during 521
flooding, less is known on its role during flooding recovery. Several studies have 522
reported increased ethylene biosynthesis and enhanced ACS and ACO expression in 523
plants upon re-oxygenation (Khan et al., 1987; Voesenek et al., 2003; García et al., 524
2014; Tsai et al., 2014; Ravanbakhsh et al., 2017). Anoxia limits ethylene 525
biosynthesis, since ACO requires O2 for ACC conversion to ethylene (Yang and 526
Hoffman 1984). However, re-oxygenation may trigger increased ethylene 527
biosynthesis, promoted by elevated levels of the rate-limiting ACC enzymes. The role 528
of ethylene during re-oxygenation could be distinct from its regulatory roles during 529
flooding and hypoxia (Fukao et al., 2011; Tsai et al., 2014; Tsai et al., 2016). In 530
Rumex, ethylene accumulation upon de-submergence correlated with increased ACC 531
levels and its conversion to ethylene by increased ACO activity (Voesenek et al., 532
2003). This rapid induction of ethylene synthesis upon de-submergence promoted 533
shoot elongation as a strategy to avoid complete submergence later (Voesenek et al., 534
2003). In addition, shoot elongation rates in R. palustris upon de-submergence was 535
dependent on submergence duration, suggesting that time taken for ACC 536
accumulation could be the rate-limiting determinant (Voesenek et al., 2003). Thus 537
the basal level of ACC biosynthesis could be critical for post-submergence ethylene 538
responses. 539
In Arabidopsis seedlings, ethylene signaling was important for limiting post-anoxic 540
injury (Tsai et al., 2014). Ethylene response transcription factor 1 (ERF1), a marker of 541
the ethylene transduction pathway, together with ERF2 were induced during re-542
oxygenation. Moreover, two ethylene-insensitive mutants, ein2-5 and ein3eil1, 543
displayed increased chlorosis and cell damage upon re-oxygenation compared to the 544
wild type. Genes encoding heat shock factors (HSF), heat shock proteins (HSP) and 545
antioxidants were significantly enriched, implying the potential challenges caused by 546
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19
re-oxygenation. The activation of ROS amelioration genes suggests that ethylene 547
could be important in eliminating ROS produced upon re-aeration. However, 548
ethylene accumulation under submergence negatively affected antioxidant levels 549
upon de-submergence in intolerant rice cultivars (Kawano et al., 2002). This again 550
suggests that regulatory roles of ethylene during hypoxia and re-oxygenation could 551
be different. In addition, comparison of the transcriptome wild type and ethylene-552
insensitive Arabidopsis mutants also suggested that ethylene might be involved in 553
regulating distinct pathways upon re-oxygenation such as jasmonate signaling, 554
feedback inhibiting its own production, and suppressing dehydration via inhibition of 555
ABA signaling (Tsai et al., 2014). 556
557
CONCLUSIONS 558
The energy and carbon crisis in flooded plants poses the largest threat to survival. 559
Sometimes starvation is ameliorated through increasing gas exchange via 560
aerenchyma and adventitious root development. However, a large majority of 561
flooding responses, such as reduced protein synthesis and down regulation of 562
secondary metabolism, most likely are coordinated via elaborate sugar sensing 563
mechanisms. Though energy signaling is essential to plant survival, by itself it is not 564
specific enough to reliably perceive flooding. However, a plant can utilize a variety of 565
other cues to precisely gauge a flooding event. 566
Changes in the gases ethylene, O2 and CO2 do not necessarily mean plants use them 567
for initiating adaptive responses. Ethylene is well established as an important signal 568
triggering several flood-adaptive traits (e.g. adventitious root and escape 569
growth)(Sasidharan & Voesenek, 2015). Rapid ethylene accumulation regardless of 570
the flooded conditions makes it a reliable signal in contrast with O2 levels that are 571
highly variable. For long it was unclear if O2 sensing occurred through direct 572
mechanisms or through an indirect effect of O2 on metabolism. It is now evident that 573
plants sense O2 through the O2-dependent degradation of ERF-VIIs (Licausi et al., 574
2011; Gibbs et al., 2011). Changes in CO2 could potentially also act as a flooding 575
signal. However, though several possible roles have been suggested (Greenway et 576
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20
al., 2006), currently, there is no evidence for a significant function in plant flooding 577
responses (Voesenek et al., 1997; Colmer et al., 2006). 578
Plants have relatively little control over these signals, which for a large part result 579
directly from the restriction of gas diffusion underwater. However, adaptive 580
downregulation of O2 consumption rate has been suggested (Zabalza et al. 2009) In 581
this sense ROS production during flooding is similar since it also occurs in an 582
unregulated process, mainly at the ETCs and peroxisomes. However, regulated ROS 583
production via the RBOHs also occurs and is essential for hypoxia acclimation and 584
survival (Loreti et al., 2016). In aerenchyma and adventitious root formation, a 585
certain background level of unregulated ROS, together with ethylene regulated 586
scavenging is required to induce cell death in specific cells (Steffens and Rasmussen, 587
2016). Taken together, rather than a cue to gauge flooding, ROS is a signaling 588
intermediate in hypoxia sensing and ethylene regulated root development. 589
NO dynamics during flooding remain unclear. However, an NO burst does occur 590
upon hypoxia, linked to hypoxia-induced NR activity. This could make NO, unlike 591
ROS, a possible signal to assess the flood event. However, NO is strongly regulated 592
by phytoglobin, which is under both ERF-VII and ethylene control (Figure 2). NO thus 593
also assumes the role of a signaling intermediate. 594
Although ethylene invariably accumulates upon flooding, a plant needs hypoxia 595
sensing to activate fermentation pathways. That this metabolic adaptation is linked 596
to O2-sensing ERF-VIIs makes sense, as it prevents fermentation in shoots submerged 597
under light conditions where not aerobic respiration, but photosynthesis is impaired. 598
Interestingly, O2 availability seems of little importance in aerenchyma formation or 599
adventitious root development (Figure 2). Given that even under drained soil 600
conditions roots experience hypoxia, could mean that O2 is not such a robust 601
flooding signal for roots. Instead, ethylene is the key player mediating this plasticity 602
in root development. These separate roles of ethylene and O2 permit a response 603
tailored to specific flooding conditions. 604
Little is known regarding O2 and ethylene interactions. However, ethylene mutants 605
have reduced hypoxic ADH upregulation (Peng et al., 2001; Yang et al. 2011), 606
ethylene-induced escape growth was enhanced under hypoxic conditions (Voesenek 607
et al., 1997) and ethylene pre-treatment can enhance anoxia tolerance (van Veen et 608
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21
al., 2013). Here there is a potential role for ROS and NO. Both are affected by and 609
have an impact on hypoxia and ethylene signaling. While NO destabilizes ERF-VIIs, it 610
is also scavenged by ethylene-inducible and ERF-VII target phytoglobin, and provides 611
a mechanistic link between ethylene and NO (Figure 2). Similarly, ROS is part of both 612
ethylene and ERF-VII signaling pathways. However, it remains unclear whether ROS 613
derived from either signal are interchangeable. 614
It is clear that plants use a multitude of signals to assess a flooding event and trigger 615
appropriate responses that prolong survival (Figure 2). Interestingly, the role of 616
these signals changes through time, as is apparent from the distinct signal 617
interactions during and after submergence (Figure 1). Relatively little is known about 618
signaling dynamics during recovery and how this links to responses initiated during 619
flooding. Additionally, electrophysiological changes occur within minutes of 620
hypoxia/anoxia, but their physiological role remains unestablished (Wang et al., 621
2017). Likewise, NO and ROS bursts occur within the first hours upon hypoxia. It is 622
unclear whether these bursts only push the plant into an altered physiological state 623
that it can homeostatically maintain, or whether they are recurring events during 624
flooding. Too little is known of the temporal dynamics of flooding signals, and the 625
future challenge lies in determining this to assess the relevant positive and negative 626
regulatory feedback loops under actual flooded conditions and how they influence 627
plant response and survival. 628
629
630
631
FIGURE LEGENDS 632 Figure 1. Signal dynamics during a typical light-limited flooding event. During early 633 submergence (light gray shading), ethylene accumulates rapidly while oxygen levels 634 decline gradually. Upon hypoxia, nitric oxide (NO) and reactive oxygen species (ROS) 635 bursts occur. Upon recovery from prolonged submergence (dark gray shading), there 636 is transient ethylene production while oxygen levels return to normal. NO dynamics 637 upon de-submergence are unknown, but a strong ROS burst likely occurs. The 638 schematic conveys general trends based on current knowledge and is intended to 639 show that flooding signals can display strong variability during different phases of 640 the flooding event. Furthermore, these signal dynamics are strongly dependent on 641 flood conditions, plant species and the organ and tissues affected. 642 643
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Figure 2. An overview of the major flooding signals (yellow boxes) and their 644 interactions, leading to the regulation of major adaptive responses (grey boxes). 645 Restricted gas exchange between the plant and its environment during flooding 646 results in alterations in endogenous levels of CO2, O2 and ethylene. These primary 647 signals can further give rise to the secondary signals ROS, NO and starvation. 648 Changes in the availability of O2 and CO2 is the net result of production, consumption 649 and diffusion and are therefore highly dependent on light conditions during flooding. 650 Changes in CO2 likely influence flooding responses due to its role as a substrate for 651 photosynthesis. CO2 limitation in the light leads to starvation and subsequent 652 metabolic reprogramming via energy signaling mechanisms. A decline in O2 levels 653 limits aerobic respiration, but also triggers downstream acclimation responses via 654 the group VII ethylene response factor (ERFVIIs) transcription factors. Oxygen 655 dependent stabilization of ERF-VIIs via the N-end rule enhances hypoxia-responsive 656 gene expression including the fermentation enzymes (eg: ALCOHOL 657 DEHYDROGENASE). However, an efficient transcriptional induction requires an ERF-658 VII dependent ROS burst through RBOHD. ROS is also formed non-enzymatically 659 during hypoxia via the electron transport chain (ETC). ERF-VII degradation is also 660 dependent on NO. Hypoxia induces NO accumulation, probably due to increased NR 661 activity and subsequent nitrite reduction at the mitochondrial ETC. However NO is 662 also scavenged during hypoxia by hemoglobin (HB1) which in turn is induced by ERF-663 VIIs. O2 levels also play an essential role in energy homeostasis not just via their role 664 as a substrate for respiration. The activation of fermentation through hypoxia-665 stabilized ERF-VIIs boosts ATP production diminishing starvation. At the same time, 666 fermentation is highly dependent on sufficient sugar availability and is thus inhibited 667 by starvation. Additionally, NO increase upon hypoxia is suggested to inhibit 668 cytochrome c oxidase and the TCA cycle enzyme aconitase, altering efficient ATP 669 generation via respiration. 670 Ethylene biosynthesis rates can change upon flooding, but reduced gas exchange is 671 the primary reason for ethylene accumulation to saturating levels. Ethylene 672 accumulation plays a pivotal role in aerenchyma and adventitious root (AR) 673 development mediated by interactions with ROS. Programmed cell death of 674 epidermal cells covering AR primordia is required for penetration, and is essential in 675 the cortex for aerenchyma formation. Ethylene-mediated ROS accumulation occurs 676 via RBOH activity or due to reduced ROS scavenging. 677 678 679
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ADVANCES
• Plants use spatial and temporal dynamics in
ethylene, O2, NO, and ROS to convey information
about flooding conditions.
• A complex web of interactions between these
various signals fine-tunes plant flooding
responses.
• Ethylene accumulates during submergence
regardless of water turbidity and light
penetration, making it a reliable flooding signal.
• The hypoxia-induced NO burst is critical for
hypoxia acclimation, possibly via S-nitrosylation
of key proteins involved in flooding adaptation.
• ROS homeostasis is important for hypoxia
survival.
• Ethylene, NO, and ROS dynamics could also be
important signals during recovery, with roles that
are distinct from those during flooding.
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OUTSTANDING QUESTIONS
• How do the spatial and temporal responses to
ethylene, O2, ROS, and NO vary during
flooding and subsequent recovery?
• To what extent are dynamics of ROS and NO
observed in hypoxic systems relevant to actual
flooded conditions?
• Do regulated and uncontrolled ROS or NO
production have similar roles during flooding
and recovery?
• What is the mechanism of ethylene and
oxygen crosstalk?
• Is there variation across species in the ability
to perceive and process flooding signals, and
does this correspond with flooding tolerance?
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