Abstract
Drought is a major limiting factor for turfgrass growth. Understanding genetic variations in physiological responses of turfgrass to drought stress would facilitate breeding and management programs to improve drought resistance. This study was designed to evaluate responses of abscisic acid (ABA) accumulation, water relations, and gas exchange to drought stress in four Kentucky bluegrass ( Poa pratensis L.) cultivars differing in drought resistance. Plants of `Midnight' and `A82-204' (drought resistant) and `Brilliant' and `RSP' (drought susceptible) were grown under well-watered (control) or drought stress conditions for 25 days in growth chambers. Turf quality, leaf water potential (Ψ leaf ), relative water content (RWC), leaf net photosynthesis rate (P n ), and stomatal conductance (g s ) declined, while electrolyte leakage (EL) increased during drought progression in all cultivars. The magnitudes of the change in these parameters were greater for `RSP' and `Brilliant' than for `Midnight' and `A82-204'. Leaf ABA content in `RSP' and `Brilliant' increased sharply after 2 days of stress to as much as 34 times the control level at 10 days of drought. Leaf ABA content in `Midnight' and `A82-204' also increased with drought, but to a lesser extent than in the other two cultivars. Leaf ABA level was negatively correlated with Ψ leaf and g s. `A82-204' had a significantly lower ABA accumulation rate with changes in Ψ leaf during drought compared to `Midnight', `RSP' and `Brilliant'; however, no differences in ABA accumulation rate were detected among the latter three cultivars. In addition, leaf g s was more sensitive to changes in ABA accumulation in `Midnight' and `A82-204' than in `RSP' and `Brilliant'. These results demonstrated that drought tolerant cultivars of Kentucky bluegrass were characterized by lower ABA accumulation and less severe decline in Ψ leaf , Pn, g s , and turf quality during drought stress than drought sensitive cultivars. Drought tolerance of Kentucky bluegrass could be related to sensitivity of stomata to endogenous accumulation of ABA under drought stress conditions.
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Claims 11
Claim · model-written summary
Drought decreased turf quality, leaf water potential and relative water content in Kentucky bluegrass.
- Taxon
- Kentucky Bluegrass
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Poa pratensist0 - Treatment
- drought stress conditionse0
- Outcome
- Turf quality, leaf water potential (Ψ leaf ), relative water content (RWC)e1
- Direction
- declinede1
- Comparator
- well-watered (control)e0
- Setting
- growth chamberse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Kentucky Bluegrass”
e0“were grown under well-watered (control) or drought stress conditions for 25 days in growth chambers”
e1“Turf quality, leaf water potential (Ψ leaf ), relative water content (RWC), leaf net photosynthesis rate (P n ), and stomatal conductance (g s ) declined”
Claim · model-written summary
Drought decreased leaf net photosynthesis rate and stomatal conductance in Kentucky bluegrass.
- Taxon
- Kentucky BluegrassPoa pratensist0
- Treatment
- drought stress conditionse0
- Outcome
- leaf net photosynthesis rate (P n ), and stomatal conductance (g s )e1
- Direction
- declinede1
- Comparator
- well-watered (control)e0
- Setting
- growth chamberse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kentucky Bluegrass”
e0“were grown under well-watered (control) or drought stress conditions for 25 days in growth chambers”
e1“Turf quality, leaf water potential (Ψ leaf ), relative water content (RWC), leaf net photosynthesis rate (P n ), and stomatal conductance (g s ) declined”
Claim · model-written summary
Drought increased electrolyte leakage in all Kentucky bluegrass cultivars.
- Taxon
- Kentucky BluegrassPoa pratensist0
- Treatment
- drought progressione2
- Outcome
- electrolyte leakage (EL)e2
- Direction
- increasede2
- Comparator
- well-watered (control)e0
- Setting
- growth chamberse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kentucky Bluegrass”
e0“were grown under well-watered (control) or drought stress conditions for 25 days in growth chambers”
e2“electrolyte leakage (EL) increased during drought progression in all cultivars”
Claim · model-written summary
The drought-induced changes in water relations and gas exchange were greater in RSP than in Midnight.
- Taxon
- Kentucky BluegrassPoa pratensist0
- Material
- RSPe3
- Outcome
- magnitudes of the change in these parameterse3
- Direction
- greatere3
- Comparator
- Midnighte3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kentucky Bluegrass”
e3“The magnitudes of the change in these parameters were greater for `RSP' and `Brilliant' than for `Midnight' and `A82-204'”
Claim · model-written summary
Leaf ABA content in RSP increased under drought to as much as 34 times the control level.
- Taxon
- Kentucky BluegrassPoa pratensist0
- Material
- RSPe4
- Treatment
- droughte4
- Outcome
- Leaf ABA contente4
- Direction
- increasede4
- Value
- 34 timese4
- Comparator
- control levele4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kentucky Bluegrass”
e4“Leaf ABA content in `RSP' and `Brilliant' increased sharply after 2 days of stress to as much as 34 times the control level at 10 days of drought”
Claim · model-written summary
Leaf ABA content in Midnight increased with drought, to a lesser extent than in the other two cultivars.
- Taxon
- Kentucky BluegrassPoa pratensist0
- Material
- Midnighte5
- Treatment
- droughte5
- Outcome
- Leaf ABA contente5
- Direction
- increasede5
- Qualifier
- to a lesser extente5
- Comparator
- the other two cultivarse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kentucky Bluegrass”
e5“Leaf ABA content in `Midnight' and `A82-204' also increased with drought, but to a lesser extent than in the other two cultivars”
Claim · model-written summary
Leaf ABA level was negatively correlated with leaf water potential and stomatal conductance.
- Taxon
- Kentucky BluegrassPoa pratensist0
- Compound
- ABAe6
- Outcome
- Ψ leaf and g se6
- Direction
- negatively correlatede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kentucky Bluegrass”
e6“Leaf ABA level was negatively correlated with Ψ leaf and g s”
Claim · model-written summary
Drought-resistant cultivar A82-204 had a significantly lower ABA accumulation rate with changes in leaf water potential than Midnight.
- Taxon
- Kentucky BluegrassPoa pratensist0
- Material
- A82-204e7
- Compound
- ABAe7
- Outcome
- ABA accumulation ratee7
- Direction
- lowere7
- Comparator
- Midnighte7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kentucky Bluegrass”
e7“`A82-204' had a significantly lower ABA accumulation rate with changes in Ψ leaf during drought compared to `Midnight', `RSP' and `Brilliant'”
Claim · model-written summary
No differences in ABA accumulation rate were detected among RSP, Brilliant and Midnight.
- Taxon
- Kentucky BluegrassPoa pratensist0
- Outcome
- ABA accumulation ratee1
- Qualifier
- among the latter three cultivarse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kentucky Bluegrass”
e1“no differences in ABA accumulation rate were detected among the latter three cultivars”
Claim · model-written summary
Leaf stomatal conductance was more sensitive to ABA accumulation in Midnight and A82-204 than in RSP and Brilliant.
- Taxon
- Kentucky BluegrassPoa pratensist0
- Material
- Midnighte2
- Compound
- ABAe2
- Outcome
- leaf g se2
- Direction
- more sensitivee2
- Comparator
- RSPe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kentucky Bluegrass”
e2“leaf g s was more sensitive to changes in ABA accumulation in `Midnight' and `A82-204' than in `RSP' and `Brilliant'”
Claim · model-written summary
Drought tolerance of Kentucky bluegrass may be related to stomatal sensitivity to endogenous ABA accumulation.
- Taxon
- Kentucky bluegrassPoa pratensise3
- Compound
- ABAe3
- Outcome
- Drought tolerancee3
- Qualifier
- sensitivity of stomata to endogenous accumulatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kentucky Bluegrass”
e3“Drought tolerance of Kentucky bluegrass could be related to sensitivity of stomata to endogenous accumulation of ABA under drought stress conditions”
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See all 11 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.