Abstract
Demographic studies suggest that mortality of emerging bunchgrass seedlings limits restoration success across North American cold desert rangelands, but how variation in seedling resilience to ecophysiological stress contributes to this is unclear. We measured light-saturated photosynthetic rate (A sat ), apparent CO 2 assimilation quantum yield (ΦCO 2 ), and light-adapted PSII yield (Φ PSII ) of seedlings from two native perennial bunchgrasses (Elymus elymoides, Pseudoroegneria spicata) during and in recovery from acute water stress (6% soil moisture). All seedlings of both species survived the 14-d dry-down and recovery, and both had ∼95% reduction in A sat and ΦCO 2 by day 3 of the dry-down but had divergent recoveries from the acute water stress. E. elymoides took a single day to recover A sat and ΦCO 2 to prestress levels, while it took P. spicata 6 d to have 50% recovery from acute water stress. Especially notable is that after reduction in Φ PSII on d 7 of the dry-down, E. elymoides recovered within 1 d at a lower Φ PSII compared with pretreatment, while P. spicata had an additional 1-d lag in Φ PSII recovery. These results suggest that E. elymoides (Turkey Lake germplasm) seedlings are more physiologically resilient to acute water stress than P. spicata (Anatone germplasm), which has implications for restoration planning and native plant breeding.
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Claims 7
Claim · model-written summary
All seedlings of both species survived the fourteen day dry down and recovery.
Not reportedTaxon
Verbatim
e0“All seedlings of both species survived the 14-d dry-down and recovery”
Claim · model-written summary
Both species had about 95% lower light saturated photosynthetic rate by day three of dry down.
Not reportedTaxonComparator
Verbatim
e0“both had ∼95% reduction in A sat and ΦCO 2 by day 3 of the dry-down”
Claim · model-written summary
Both species had about 95% lower apparent CO2 assimilation quantum yield by day three of dry down.
Not reportedTaxonComparator
Verbatim
e0“both had ∼95% reduction in A sat and ΦCO 2 by day 3 of the dry-down”
Claim · model-written summary
Elymus elymoides recovered A sat and ΦCO2 to prestress levels in one day.
- Taxon
- E. elymoides
Elymus elymoidese0 - Outcome
- A sat and ΦCO 2e0
- Direction
- recovere0
- Value
- a single daye0
- Comparator
- prestress levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“E. elymoides took a single day to recover A sat and ΦCO 2 to prestress levels”
Claim · model-written summary
Pseudoroegneria spicata took six days to reach 50% recovery after acute water stress.
- Taxon
- P. spicata
.jpg?width=60)
Pseudoroegneria spicatae0 - Outcome
- recovery from acute water stresse0
- Value
- 50%e0
- Qualifier
- 6 de0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“P. spicata 6 d to have 50% recovery from acute water stress”
Claim · model-written summary
Elymus elymoides recovered PSII yield within one day, at a level below pretreatment.
- Taxon
- E. elymoidesElymus elymoidese0
- Outcome
- Φ PSIIe0
- Direction
- lowere0
- Value
- 1 de0
- Comparator
- pretreatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“E. elymoides recovered within 1 d at a lower Φ PSII compared with pretreatment”
Claim · model-written summary
Pseudoroegneria spicata had an additional one day lag in PSII yield recovery.
- Taxon
- P. spicataPseudoroegneria spicatae0
- Outcome
- Φ PSII recoverye0
- Value
- 1-de0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. spicata had an additional 1-d lag in Φ PSII recovery”