courtney wilson dr. robert meinke and kelly amsberry plagiobothrys hirtus: seed viability for...
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![Page 1: Courtney Wilson Dr. Robert Meinke and Kelly Amsberry Plagiobothrys hirtus: Seed Viability for Recovery](https://reader035.vdocuments.site/reader035/viewer/2022062714/56649d545503460f94a31434/html5/thumbnails/1.jpg)
Courtney WilsonDr. Robert Meinke and
Kelly Amsberry
Plagiobothrys hirtus: Seed Viability for Recovery
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Why Plant Conservation Matters
Biodiversity
Natural resources
Medicinal
Agriculture/horticulture
It’s so important, it’s the law
Photos available at: cyberlawindia.com, beginlivinghealthy.com, paulpenders.com, constructionnvqs.com
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OverviewOverview
Introduction to Plagiobothrys hirtus and its habitat
Germination testing and viability studies
Site selection for outplanting
Recovery applications
Future studyPhoto by ODA staff
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P. hirtus P. hirtus andand its habitatits habitat
Boraginaceae family Facultatively perennial Hairy stems Populations limited to ~45
acres of Douglas County, Oregon
Wetland species found in swales, wet meadows, open marshes
Photo by Kelly Amsberry
Photo by Melissa Carr
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Wetlands
Ecological role of wetlands: Habitat for plants and
animals Water filtration Flood control
Humans and Wetlands Economic importance: EPA
estimates functions performed worldwide by wetlands is valued at $14.9 trillion per year
Tourism and recreation: birdwatching, fishing, canoeing, hunting
Photo by ODA staff
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P. hirtus habitat destruction
Development Agriculture Roadside pesticide usage Invasive species Recreational abuse
Photos by Courtney Wilson, ODA staff, and available at supermotors.net
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Federal and state listed endangered plant species
P. hirtus is Oregon’s # 1 priority recovery species
Taxonomically a speciesFacing a high level of threatHigh potential for recovery
As a small population, P. hirtus is especially vulnerable to:
Genetic driftReduced population
adaptability Inbreeding depression
Photo by Melissa Carr
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Research Question:Research Question:
Do different maternal lines express differing germination
rates?
Photo by ODA staff
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What we know about the germination of P. hirtus
In the wild, it germinates when fall rains begin
Under proper conditions, germination rates are ~67-95%
Does not express dormancy
Objectives:Find out if there is a relationship
between genetic diversity and germination rate
Develop protocol for seed management
Find new administratively protected sites for reintroductions
Grow plants in the OSU greenhousesTransplant to new sites
Downlist P. hirtus from endangered to threatened
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Seed CollectionSeed CollectionCollections from 4
populations in Douglas County
1. South Side Swale-DSWCD
2. Popcorn Swale-TNC 3. North Star Property 4. West Gate-BLM
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Seed Collection ProtocolSeed Collection Protocol
Monitor plants for ripeness from June-July
Seed collected from 25 maternal lines from each of the 4 populations
Phenotypic traits of each plant noted: size performance flower size flower quantity
Seeds dried at 55˚ C for 24 hours
Photo by Kelly Amsberry
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Genetic diversity visible in the range of phenotypic traits
Phenotypic traits of populations
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Seed Germination
5 Weeks
4 Populations
100 germination trials
Outcome:
Viability ranking and range for each population
Relationships between phenotypic traits and germination rates
Photo by Julia McGonigle
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Dormancy: a groundbreaking discoveryWe know it takes less
than 7 days for P. hirtus seeds to germinate.
7 days + no germination events + proper enviro. conditions=these seeds were expressing dormancy!
I used 3 different treatments to break dormancy.
Week 1
Treatments 100% seedsDI water
Weeks 2 and 3: Treatments added
20% seeds 0.05% GA3
20% seeds 0.25% KNO3
20% seeds13˚C cold stratification
40% seeds DI water
Photo available at “Naturalism: a Genesis” from http://punknaturalism.com/2010/07/
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Results: treatments
Some seeds treated with DI water began to moldSeeds treated with cold stratification had the highest germination rate
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Results: cold stratification
Germination rate by population
54%
88%
Popcorn Swale
Germination rates by population. n=5 for all populations. Relevance calculated using one-way ANOVA (P=0.001) Note that bars topped with the same letter are not significantly different, however, trends indicate that populations with higher genetic diversity have a higher germination rate.
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Results: reproductive capacity by population
Reproductive capacity calculated by multiplying (X)(Y)(Z)(G)
(X) seeds per flower(Y) flowers per inflorescence(Z) inflorescences per plant(G) germination rate
Population Reproductive capacity
Viability range in maternal lines
North Star 296.36 0 - 10
South Side Swale
181.86 0 - 9
Popcorn Swale 154.91 0 - 8
West Gate 39.07 0- 5
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Cold remediation
Put all the dormant DI treated seeds (40% of entire experiment) in cold stratification
Why? To salvage genetic material for transplanting new populations
Photo by Courtney Wilson
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Site selection for restoration at Site selection for restoration at NBHMANBHMA
*GIS: compiled aspects of slope and soil type
*Habitat suitability analysis
Model based on the condition and presence/absence of 9 characteristics:
1.Invasive species
4. Hydrology 7. Elevation
2. Associated species
5. Canopy cover
8. Proximity
3. Rush/sedge/grass dominated marsh
6. Soil type 9. Disturbance
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Potential habitat map
Map by Mike Hubbard
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Results: NBHMA restoration populations
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Recovery Applications
We now know:
P. hirtus expresses dormancy.
Dormancy is most easily broken with cold stratification.
Recovery strategies should mix seed to achieve highest levels of genetic diversity. Photo by Courtney Wilson
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Downlist Downlist P. hirtusP. hirtus
The PLHI recovery plan requires 9 protected reserves with a minimum of 5,000 plants each to downlist status from endangered to threatened
Currently on our way at three more potential populations and ~700 plantsin the greenhouse
Outstanding support from agencies and private landowners
Photo by Sam Friedman
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Future StudyFuture Study
The more I observe, the more questions I have!
Grazing: friend or foe? Medicinal properties? Roadside locations and spontaneous abortion? Dormancy mechanism?
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Many thanks
HHMI ODA Mentors Robert Meinke and Kelly Amsberry Kevin Ahern My field crew Jordan Brown, Sean Elseth, and Matt Groberg
Bureau of Land Management The Nature Conservancy Douglas Soil and Water Conservation District Danny Lang and Al Beck