Abstract
The effect of improved heat tolerance through drought preconditioning on responses to drought preconditioning under heat stress was studied in two Kentucky bluegrasses.Plants of Kentucky bluegrass(Poa pratensis)cultivarsMidnight(drought resistant)andBrilliant(drought sensitive)were well watered(non-preconditioned control)or exposed to two cycles of drought stress without irrigation(drought preconditioning)and then exposed to heat stress(35℃/30℃,day/night)for 25days in growth chambers.Turf quality and other physiological parameters in leaves were determined at 0(end of drought preconditioning and beginning of heat treatment),5,10,15,20,and 25days of heat treatment.During the period of heat stress,drought-preconditioning of cv.Brilliantresulted in significantly(P0.05)higher turf quality compared with the non-preconditionedBrilliant.After 5days of heat stress,osmotic potential gradually declined in droughtpreconditionedBrilliant,but there was little change in the non-preconditioniedBrilliant.Plants of droughtpreconditionedBrilliantmaintained significantly(P0.05)higher relative water content than those of nonpreconditioned plants at 10and 15days of heat stress.The activities of superoxide dismutase and catalase were significantly(P0.05)higher in drought-preconditionedBrilliantthan in non-preconditionedBrilliantat 10and 20days of heat stress,but electrolyte leakage was the reverse.There was significantly(P0.05)higher fatty acid(16∶0and 18∶0)content in drought-preconditionedBrilliantthan in non-preconditionedBrilliantafter 15days of heat stress,although the content of 18∶3was the opposite.Drought-preconditioned Midnighthad a higher double bond index(DBI)than non-preconditionedBrilliant.The physiological parameters were not significantly different in the two treatments inMidnightunder heat stress.In conclusion,drought preconditioning improved heat tolerance in the drought sensitive cv.Brilliantbut failed to improve heat tolerance in the drought resistant cv.Midnight'.Improved heat tolerance through drought preconditioning inBrilliantwas associated with increased osmoregulatory ability and the promotion of antioxidant activities which can protect unsaturated fatty acids from damage.These changes may play an important role in improving leaf relative water content,protecting membrane systems and delaying leaf senescence.
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Claims 11
Claim · model-written summary
Preconditioned Brilliant had significantly higher turf quality during heat stress.
- Taxon
- Kentucky bluegrasses
.jpg?width=60)
Poa pratensist0 - Material
- Brilliante0
- Treatment
- drought-preconditioninge0
- Outcome
- turf qualitye0
- Direction
- highere0
- Comparator
- non-preconditionedBrilliante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“drought-preconditioning of cv.Brilliantresulted in significantly(P0.05)higher turf quality compared with the non-preconditionedBrilliant.”
t0“Kentucky bluegrasses”
Claim · model-written summary
Osmotic potential declined in preconditioned Brilliant after five days of heat stress.
- Taxon
- Kentucky bluegrassesPoa pratensist0
- Material
- Brilliante0
- Treatment
- droughtpreconditionedBrilliante0
- Outcome
- osmotic potentiale0
- Direction
- declinede0
- Comparator
- non-preconditioniedBrilliante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 5days of heat stress,osmotic potential gradually declined in droughtpreconditionedBrilliant,but there was little change in the non-preconditioniedBrilliant.”
t0“Kentucky bluegrasses”
Claim · model-written summary
Preconditioned Brilliant maintained higher relative water content at 10 and 15 days.
- Taxon
- Kentucky bluegrassesPoa pratensist0
- Material
- Brilliante0
- Treatment
- droughtpreconditionedBrilliante0
- Outcome
- relative water contente0
- Direction
- highere0
- Comparator
- nonpreconditioned plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants of droughtpreconditionedBrilliantmaintained significantly(P0.05)higher relative water content than those of nonpreconditioned plants at 10and 15days of heat stress.”
t0“Kentucky bluegrasses”
Claim · model-written summary
Preconditioning raised superoxide dismutase and catalase activities in Brilliant.
- Taxon
- Kentucky bluegrassesPoa pratensist0
- Material
- Brilliante0
- Treatment
- drought-preconditionedBrilliante0
- Outcome
- activities of superoxide dismutase and catalasee0
- Direction
- highere0
- Comparator
- non-preconditionedBrilliante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of superoxide dismutase and catalase were significantly(P0.05)higher in drought-preconditionedBrilliantthan in non-preconditionedBrilliantat 10and 20days of heat stress,but electrolyte leakage was the reverse.”
t0“Kentucky bluegrasses”
Claim · model-written summary
Preconditioning lowered electrolyte leakage in Brilliant.
- Taxon
- Kentucky bluegrassesPoa pratensist0
- Material
- Brilliante0
- Treatment
- drought-preconditionedBrilliante0
- Outcome
- electrolyte leakagee0
- Direction
- lowerinferrede0
- Comparator
- non-preconditionedBrilliante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activities of superoxide dismutase and catalase were significantly(P0.05)higher in drought-preconditionedBrilliantthan in non-preconditionedBrilliantat 10and 20days of heat stress,but electrolyte leakage was the reverse.”
t0“Kentucky bluegrasses”
Claim · model-written summary
Preconditioned Brilliant had higher 16:0 and 18:0 fatty acid content.
- Taxon
- Kentucky bluegrassesPoa pratensist0
- Material
- Brilliante0
- Treatment
- drought-preconditionedBrilliante0
- Outcome
- fatty acid(16∶0and 18∶0)contente0
- Direction
- highere0
- Comparator
- non-preconditionedBrilliante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was significantly(P0.05)higher fatty acid(16∶0and 18∶0)content in drought-preconditionedBrilliantthan in non-preconditionedBrilliantafter 15days of heat stress,although the content of 18∶3was the opposite.”
t0“Kentucky bluegrasses”
Claim · model-written summary
Preconditioned Brilliant had lower 18:3 content.
- Taxon
- Kentucky bluegrassesPoa pratensist0
- Material
- Brilliante0
- Treatment
- drought-preconditionedBrilliante0
- Outcome
- content of 18∶3e0
- Direction
- lowerinferrede0
- Comparator
- non-preconditionedBrilliante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was significantly(P0.05)higher fatty acid(16∶0and 18∶0)content in drought-preconditionedBrilliantthan in non-preconditionedBrilliantafter 15days of heat stress,although the content of 18∶3was the opposite.”
t0“Kentucky bluegrasses”
Claim · model-written summary
Preconditioned Midnight had a higher double bond index than non-preconditioned Brilliant.
- Taxon
- Kentucky bluegrassesPoa pratensist0
- Material
- Midnighte0
- Outcome
- double bond index(DBI)e0
- Direction
- highere0
- Comparator
- non-preconditionedBrilliante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought-preconditioned Midnighthad a higher double bond index(DBI)than non-preconditionedBrilliant.”
t0“Kentucky bluegrasses”
Claim · model-written summary
Midnight showed no significant physiological parameter differences between treatments under heat stress.
- Taxon
- Kentucky bluegrassesPoa pratensist0
- Material
- Midnighte0
- Treatment
- two treatmentse0
- Outcome
- physiological parameterse0
- Direction
- not significantly differente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The physiological parameters were not significantly different in the two treatments inMidnightunder heat stress.”
t0“Kentucky bluegrasses”
Claim · model-written summary
Preconditioning improved heat tolerance in Brilliant.
- Taxon
- Kentucky bluegrassesPoa pratensist0
- Material
- Brilliante0
- Treatment
- drought preconditioninge0
- Outcome
- heat tolerancee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought preconditioning improved heat tolerance in the drought sensitive cv.Brilliantbut failed to improve heat tolerance in the drought resistant cv.Midnight”
t0“Kentucky bluegrasses”
Claim · model-written summary
Preconditioning failed to improve heat tolerance in Midnight.
- Taxon
- Kentucky bluegrassesPoa pratensist0
- Material
- Midnighte0
- Treatment
- drought preconditioninge0
- Outcome
- heat tolerancee0
- Direction
- failed to improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought preconditioning improved heat tolerance in the drought sensitive cv.Brilliantbut failed to improve heat tolerance in the drought resistant cv.Midnight”
t0“Kentucky bluegrasses”
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