Abstract
Kentucky bluegrass ( Poa pratensis L.; KBG) has good turf quality with adequate irrigation, but moderate to low drought resistance. Interspecific hybridization of Kentucky bluegrass with Texas bluegrass ( Poa arachnifera Torr.; TBG), a drought resistant grass native to Texas, has been made to transfer genes of drought resistance from TBG to KBG. The objectives of this study were (i) to investigate whether the hybrids have improved drought resistance compared with either TBG or KBG by examining physiological responses to drought stress; and (ii) to determine major physiological factors associated with recuperative ability of those plants from drought stress. Plants were exposed to drought stress by withholding irrigation for 42 d in a greenhouse. The experiment consisted of 29 fourth‐generation backcrossed hybrids, one third‐generation hybrid (BDF), two KBG parents (‘C‐74’, ‘Midnight’), and one TBG parent. The genotypes classified into three cluster groups of drought resistance (high, moderate, and low) based on the responses of relative water content (RWC), electrolyte leakage (EL), and photochemical efficiency (Fv/Fm) to drought stress. The RWC and Fv/Fm declined with drought stress, but were maintained at higher levels in the high resistance group than the other group, while EL increased during drought and was lower in the high resistance group. Texas bluegrass, Midnight KBG, and two hybrids were ranked highest in drought resistance. Other hybrids varied in drought resistance, with more hybrids of BDF × Midnight ranked in the high drought resistance group than the hybrids of BDF × C‐74. Among all physiological parameters examined, EL was the most sensitive indicator to drought stress, as demonstrated by its most rapid increase in response to the stress. High Fv/Fm and retaining of green leaves during drought stress contributed to fast recovery from drought stress following rewatering.
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Claims 9
Claim · model-written summary
Genotypes grouped into high, moderate and low drought-resistance classes by RWC, EL and Fv/Fm
- Taxon
- Kentucky bluegrass
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Poa pratensise0 - Outcome
- drought resistancee1
- Qualifier
- three cluster groups of drought resistance (high, moderate, and low)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Kentucky bluegrass ( Poa pratensis L.; KBG) has good turf quality”
e1“The genotypes classified into three cluster groups of drought resistance (high, moderate, and low) based on the responses of relative water content (RWC), electrolyte leakage (EL), and photochemical efficiency (Fv/Fm) to drought stress”
Claim · model-written summary
Drought stress reduced RWC and Fv/Fm of Kentucky bluegrass genotypes
- Taxon
- Kentucky bluegrassPoa pratensise0
- Treatment
- drought stresse2
- Outcome
- RWC and Fv/Fme2
- Direction
- declinede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kentucky bluegrass ( Poa pratensis L.; KBG) has good turf quality”
e2“The RWC and Fv/Fm declined with drought stress, but were maintained at higher levels in the high resistance group than the other group, while EL increased during drought and was lower in the high resistance group”
Claim · model-written summary
RWC and Fv/Fm were higher in the high drought-resistance group than in the other groups
- Taxon
- Kentucky bluegrassPoa pratensise0
- Outcome
- RWC and Fv/Fme2
- Direction
- highere2
- Qualifier
- high resistance groupe2
- Comparator
- the other groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kentucky bluegrass ( Poa pratensis L.; KBG) has good turf quality”
e2“The RWC and Fv/Fm declined with drought stress, but were maintained at higher levels in the high resistance group than the other group, while EL increased during drought and was lower in the high resistance group”
Claim · model-written summary
Drought increased electrolyte leakage in Kentucky bluegrass genotypes
- Taxon
- Kentucky bluegrassPoa pratensise0
- Treatment
- droughte2
- Outcome
- ELe2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kentucky bluegrass ( Poa pratensis L.; KBG) has good turf quality”
e2“The RWC and Fv/Fm declined with drought stress, but were maintained at higher levels in the high resistance group than the other group, while EL increased during drought and was lower in the high resistance group”
Claim · model-written summary
Electrolyte leakage was lower in the high drought-resistance group under drought
- Taxon
- Kentucky bluegrassPoa pratensise0
- Treatment
- droughte2
- Outcome
- ELe2
- Direction
- lowere2
- Qualifier
- high resistance groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kentucky bluegrass ( Poa pratensis L.; KBG) has good turf quality”
e2“The RWC and Fv/Fm declined with drought stress, but were maintained at higher levels in the high resistance group than the other group, while EL increased during drought and was lower in the high resistance group”
Claim · model-written summary
Electrolyte leakage was the most sensitive indicator of drought stress among the parameters examined
- Taxon
- Kentucky bluegrassPoa pratensise0
- Outcome
- ELe5
- Qualifier
- the most sensitive indicator to drought stresse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kentucky bluegrass ( Poa pratensis L.; KBG) has good turf quality”
e5“EL was the most sensitive indicator to drought stress, as demonstrated by its most rapid increase in response to the stress”
Claim · model-written summary
Texas bluegrass, Midnight KBG and two hybrids ranked highest in drought resistance
- Taxon
- Texas bluegrassPoa arachniferae3
- Outcome
- drought resistancee3
- Qualifier
- ranked higheste3
Verbatim
e3“Texas bluegrass, Midnight KBG, and two hybrids were ranked highest in drought resistance”
Claim · model-written summary
More BDF x Midnight hybrids than BDF x C-74 hybrids fell in the high drought-resistance group
Verbatim
e4“more hybrids of BDF × Midnight ranked in the high drought resistance group than the hybrids of BDF × C‐74”
Claim · model-written summary
High Fv/Fm and green leaf retention may contribute to fast recovery of Kentucky bluegrass from drought after rewatering
- Taxon
- Kentucky bluegrassPoa pratensise0
- Outcome
- fast recovery from drought stresse6
- Qualifier
- High Fv/Fm and retaining of green leaves during drought stresse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kentucky bluegrass ( Poa pratensis L.; KBG) has good turf quality”
e6“High Fv/Fm and retaining of green leaves during drought stress contributed to fast recovery from drought stress following rewatering”
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