first steps towards an explicit modeling of ......2013/05/07 · first steps towards an explicit...
TRANSCRIPT
9th International Workshop on Sap Flow7th June 2013
Plant PhysiologyULg
FIRST STEPS TOWARDS AN EXPLICIT MODELING OF ABA PRODUCTION AND
TRANSLOCATION IN RELATION WITH THE WATER UPTAKE DYNAMICS
GUILLAUME LOBET, LOÏC PAGÈS AND XAVIER DRAYE
1
Plant PhysiologyULg
PLANET-ABA
2
PlaNet
Modeling results
Water Flow
Conclusions
WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM
PLANT
Plant PhysiologyULg
PLANET-ABA
2
PlaNet
Modeling results
Water Flow
Conclusions
SOIL
AIR
WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM
PLANT
Plant PhysiologyULg
PLANET-ABA
2
PlaNet
Modeling results
Water Flow
Conclusions
SOIL
AIR
WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM
PLANT
Plant PhysiologyULg
PLANET-ABA
2
PlaNet
Modeling results
Water Flow
Conclusions
SOIL
AIR
WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM
PLANT
Plant PhysiologyULg
PLANET-ABA
2
PlaNet
Modeling results
Water Flow
Conclusions
SOIL
AIR
WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM
PLANT
Plant PhysiologyULg
PLANET-ABA
2
PlaNet
Modeling results
Water Flow
Conclusions
SOIL
AIR
ABA
WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM
PLANT
Plant PhysiologyULg
PLANET-ABA
2
PlaNet
Modeling results
Water Flow
Conclusions
SOIL
AIR
ABA
4D architecture
Heterogenous hydraulic
conductances
Root to shoot signaling
WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM
Plant PhysiologyULg
PLANET-ABA
PlaNet
Modeling results
Water Flow
Conclusions
4D architecture
Heterogenous hydraulic
conductances
Root to shoot signaling
MODELING WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM
PLANET-MAIZE
Lobet et al, 2012
Plant PhysiologyULg
PLANET-ABA
4
PlaNet
Modeling results
Water Flow
Conclusions
ψxyl ψsoil
ψsoil
Kx
Kx
Kr
Krψxyl
ψxyl ψsoil
Kx
Kr
ψxyl ψsoil
KxKr
ψxylψsoil
ψsoil
Kx
Kx
Kr
Krψxyl
ψxylψsoil
Kx
Kr
Variable hydraulic propertiesSystem of linear equations
4D architecture
Heterogenous hydraulic
conductances
Root to shoot signaling
MODELING WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM
Doussan et al. 2006
Plant PhysiologyULg
PLANET-ABA
5
PlaNet
Modeling results
Water Flow
Conclusions
4D architecture
Heterogenous hydraulic
conductances
Root to shoot signaling
MODELING WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM
ABA translocation
Stomatal closure = f(ψ, ABA)
ABA production = f(ψ)ABA degradation = f(t)
ABA production = f(ψ)ABA degradation = f(t)
Tardieu et Davies 1993Dodd et al. 2008, 2010
Plant PhysiologyULg
PLANET-ABA
5
PlaNet
Modeling results
Water Flow
Conclusions
4D architecture
Heterogenous hydraulic
conductances
Root to shoot signaling
MODELING WATER FLOW IN THESOIL-PLANT-ATMOSPHERE CONTINUUM
ABA translocation
Stomatal closure = f(ψ, ABA)
ABA production = f(ψ)ABA degradation = f(t)
ABA production = f(ψ)ABA degradation = f(t)
Tardieu et Davies 1993Dodd et al. 2008, 2010
LEAF
ROOT
Plant PhysiologyULg
PLANET-ABA
6
PlaNet
Modeling results
Water Flow
Conclusions
SIMULATION PARAMETERS
-1,5
-1,1
-0,8
-0,4
0
100 150 200 250 300so
il wat
er p
oten
tial (
MPa
)time (h)
Homogenous soil water content
decrease
Three conditions
2. No ABA production in the
roots
3. No ABA production in the
shoot
1. Normal conditions
Plant PhysiologyULg
PLANET-ABA
7
PlaNet
Modeling results
Water Flow
Conclusions
NORMAL SCENARIO
100 150 200 250 300
-1.2
-0.8
-0.4
Roots
time (h)
wat
er p
oten
tial (
MP
a)No dryingHomogenous drying
100 150 200 250 300
-1.2
-0.8
-0.4
Leaves
time (h)100 150 200 250 300
-1.2
-0.8
-0.4
Soil
time (h)
A B C
Plant water potential decrease with soil drying
Plant PhysiologyULg
PLANET-ABA
7
PlaNet
Modeling results
Water Flow
Conclusions
NORMAL SCENARIO
100 150 200 250 300
-1.2
-0.8
-0.4
Roots
time (h)
wat
er p
oten
tial (
MP
a)No dryingHomogenous drying
100 150 200 250 300
-1.2
-0.8
-0.4
Leaves
time (h)100 150 200 250 300
-1.2
-0.8
-0.4
Soil
time (h)
A B C
100 150 200 250 300
0.2
1.0
5.0
20.0
100.0 Roots
time (h)
[AB
A] n
M
No dryingHomogenous drying
100 150 200 250 300
520
50200
1000
Leaves
time (h)
[AB
A] n
M
100 150 200 250 300
520
50200
1000
Collar
time (h)
[AB
A] n
M
A B CRoots Leaves Collar
Plant water potential decrease with soil drying
ABA is produced as plant article water potential decreases
Plant PhysiologyULg
PLANET-ABA
7
PlaNet
Modeling results
Water Flow
Conclusions
NORMAL SCENARIO
100 150 200 250 300
-1.2
-0.8
-0.4
Roots
time (h)
wat
er p
oten
tial (
MP
a)No dryingHomogenous drying
100 150 200 250 300
-1.2
-0.8
-0.4
Leaves
time (h)100 150 200 250 300
-1.2
-0.8
-0.4
Soil
time (h)
A B C
100 150 200 250 300
0.2
1.0
5.0
20.0
100.0 Roots
time (h)
[AB
A] n
M
No dryingHomogenous drying
100 150 200 250 300
520
50200
1000
Leaves
time (h)
[AB
A] n
M
100 150 200 250 300
520
50200
1000
Collar
time (h)
[AB
A] n
M
A B CRoots Leaves Collar
100 150 200 250 300
1e-10
2e-10
5e-10
1e-09
2e-09
temps (h)
radi
al c
ond.
(m−1
sMPa)
No dryingHomogenous drying
100 150 200 250 300-2.0e-09
-1.5e-09
-1.0e-09
-5.0e-10
0.0e+00
temps (h)
radi
al fl
ux (kg H
20/s)
100 150 200 250 300
050
100
150
200
250
300
temps (h)
cum
ulat
ive
trans
pira
tion
(gH
20)
A B
time(h) time(h)
Plant water potential decrease with soil drying
ABA is produced as plant article water potential decreases
Stomata closes with soil drying
Plant PhysiologyULg
PLANET-ABA
8
PlaNet
Modeling results
Water Flow
Conclusions
REMOVING ABA PRODUCTION
Plant PhysiologyULg
PLANET-ABA
8
PlaNet
Modeling results
Water Flow
Conclusions
REMOVING ABA PRODUCTION
No ABA in the leaves Removes stomatal response
Plant PhysiologyULg
PLANET-ABA
8
PlaNet
Modeling results
Water Flow
Conclusions
REMOVING ABA PRODUCTION
No ABA in the leaves Removes stomatal response
No ABA in the root No effect on stomatal response
Plant PhysiologyULg
PLANET-ABA
9
PlaNet
Modeling results
Water Flow
Conclusions
DISCUSSIONS
In its current version the model does not support the role of ABA as a long distance signal
Plant PhysiologyULg
PLANET-ABA
9
PlaNet
Modeling results
Water Flow
Conclusions
DISCUSSIONS
In its current version the model does not support the role of ABA as a long distance signal
In contraction with previous studies (Parent et al. 2009; Tardieu & Davies 1993; Tardieu & Simonneau 1998; Tardieu & Davies 1992)
Plant PhysiologyULg
PLANET-ABA
9
PlaNet
Modeling results
Water Flow
Conclusions
DISCUSSIONS
In its current version the model does not support the role of ABA as a long distance signal
In contraction with previous studies (Parent et al. 2009; Tardieu & Davies 1993; Tardieu & Simonneau 1998; Tardieu & Davies 1992)
Not enough quantitative data at the local scale
Plant PhysiologyULg
PLANET-ABA
9
PlaNet
Modeling results
Water Flow
Conclusions
DISCUSSIONS
In its current version the model does not support the role of ABA as a long distance signal
In contraction with previous studies (Parent et al. 2009; Tardieu & Davies 1993; Tardieu & Simonneau 1998; Tardieu & Davies 1992)
Not enough quantitative data at the local scale
ABA dynamic more complex (ABA-GE, ...)
Plant PhysiologyULg
PLANET-ABA
10
PlaNet
Modeling results
Water Flow
Conclusions
CONCLUSIONS
First step toward explicit modeling of ABA flux and effect on water flow at the plant level
Model is not able to reproduce the reality
ACKNOWLEDGMENTS
Sensitivity analysis on production and degradation rates