Abstract
Introduction Evaluation of the effects of water-limited conditions on the photosynthetic characteristics and forage yield is important for enhancing the forage productivity and drought tolerance in Kentucky bluegrass ( Poa pratensis L.). Methods In the present study, 100 P . pratensis ecotypes collected from different geographical areas in Iran were assessed under well-watered and drought stress conditions. Genetic variation and response to selection for the photosynthetic characteristics [i.e., net photosynthesis rate (A), stomatal conductance ( g s ), transpiration rate (T r ), chlorophyll content (Chl), and photochemical efficiency (Fv/Fm)] and forage yield [fresh forage yield (FY) and dry forage yield (Dy)] traits were analyzed during the 2018 and 2019 growing seasons. Results and discussion Drought stress had negative effects on evaluated photosynthesis parameters and significantly reduced dry and fresh forage yields. On average, FY with a 45% decrease and g s with a 326% decrease under drought stress conditions showed the highest reduction rate among forage yield and photosynthesis traits, respectively. Genotypic coefficients of variation (GCV) for FY were lower under drought stress. The estimates of heritability, genetic advance, and genetic advance as percentage of mean showed the predominance of additive gene action for the traits. Overall, the results showed that “Ciakhor”, “Damavand”, “Karvandan”, “Basmenj”, “Abr2”, “Abrumand”, “Borhan”, “Hezarkanian”, “LasemCheshmeh”, “Torshab”, and “DoSar” have higher forage yield production with little change between two irrigation regimes, which makes them promising candidates for developing high-yielding drought-tolerant varieties through breeding programs.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Drought stress had negative effects on the evaluated photosynthesis parameters of Kentucky bluegrass ecotypes.
- Taxon
- Poa pratensis L.
.jpg?width=60)
Poa pratensise0 - Material
- ecotypese1
- Treatment
- drought stresse2
- Outcome
- photosynthesis parameterse2
- Direction
- negative effectse2
- Comparator
- well-waterede1
- Setting
- Irane1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Evaluation of the effects of water-limited conditions on the photosynthetic characteristics and forage yield is important for enhancing the forage productivity and drought tolerance in Kentucky bluegrass ( Poa pratensis L.)”
e1“100 P . pratensis ecotypes collected from different geographical areas in Iran were assessed under well-watered and drought stress conditions”
e2“Drought stress had negative effects on evaluated photosynthesis parameters and significantly reduced dry and fresh forage yields”
Claim · model-written summary
Drought stress significantly reduced dry and fresh forage yields of the ecotypes.
- Taxon
- Poa pratensis L.Poa pratensise0
- Material
- ecotypese1
- Treatment
- drought stresse2
- Outcome
- dry and fresh forage yieldse2
- Direction
- significantly reducede2
- Comparator
- well-waterede1
- Setting
- Irane1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Evaluation of the effects of water-limited conditions on the photosynthetic characteristics and forage yield is important for enhancing the forage productivity and drought tolerance in Kentucky bluegrass ( Poa pratensis L.)”
e1“100 P . pratensis ecotypes collected from different geographical areas in Iran were assessed under well-watered and drought stress conditions”
e2“Drought stress had negative effects on evaluated photosynthesis parameters and significantly reduced dry and fresh forage yields”
Claim · model-written summary
On average, fresh forage yield (FY) decreased by 45% under drought stress, the highest reduction rate among forage yield and photosynthesis traits.
- Taxon
- Poa pratensis L.Poa pratensise0
- Material
- ecotypese1
- Treatment
- drought stress conditionse3
- Outcome
- FYe3
- Direction
- decreasee3
- Value
- 45%e3
- Qualifier
- highest reduction rate among forage yield and photosynthesis traitse3
- Comparator
- well-waterede1
- Setting
- Irane1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Evaluation of the effects of water-limited conditions on the photosynthetic characteristics and forage yield is important for enhancing the forage productivity and drought tolerance in Kentucky bluegrass ( Poa pratensis L.)”
e1“100 P . pratensis ecotypes collected from different geographical areas in Iran were assessed under well-watered and drought stress conditions”
e3“On average, FY with a 45% decrease and g s with a 326% decrease under drought stress conditions showed the highest reduction rate among forage yield and photosynthesis traits, respectively”
Claim · model-written summary
Stomatal conductance (g s) showed a 326% decrease under drought stress.
- Taxon
- Poa pratensis L.Poa pratensise0
- Material
- ecotypese1
- Treatment
- drought stress conditionse3
- Outcome
- g se3
- Direction
- decreasee3
- Value
- 326%e3
- Comparator
- well-waterede1
- Setting
- Irane1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Evaluation of the effects of water-limited conditions on the photosynthetic characteristics and forage yield is important for enhancing the forage productivity and drought tolerance in Kentucky bluegrass ( Poa pratensis L.)”
e1“100 P . pratensis ecotypes collected from different geographical areas in Iran were assessed under well-watered and drought stress conditions”
e3“On average, FY with a 45% decrease and g s with a 326% decrease under drought stress conditions showed the highest reduction rate among forage yield and photosynthesis traits, respectively”
Claim · model-written summary
Genotypic coefficients of variation for FY were lower under drought stress.
- Taxon
- Poa pratensis L.Poa pratensise0
- Material
- ecotypese1
- Treatment
- drought stresse4
- Outcome
- Genotypic coefficients of variation (GCV) for FYe4
- Direction
- lowere4
- Comparator
- well-waterede1
- Setting
- Irane1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Evaluation of the effects of water-limited conditions on the photosynthetic characteristics and forage yield is important for enhancing the forage productivity and drought tolerance in Kentucky bluegrass ( Poa pratensis L.)”
e1“100 P . pratensis ecotypes collected from different geographical areas in Iran were assessed under well-watered and drought stress conditions”
e4“Genotypic coefficients of variation (GCV) for FY were lower under drought stress”
Claim · model-written summary
Heritability and genetic advance estimates showed a predominance of additive gene action for the traits.
- Taxon
- Poa pratensis L.Poa pratensise0
- Outcome
- additive gene actione5
- Qualifier
- estimates of heritability, genetic advancee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Evaluation of the effects of water-limited conditions on the photosynthetic characteristics and forage yield is important for enhancing the forage productivity and drought tolerance in Kentucky bluegrass ( Poa pratensis L.)”
e5“The estimates of heritability, genetic advance, and genetic advance as percentage of mean showed the predominance of additive gene action for the traits”
Claim · model-written summary
Eleven named ecotypes had higher forage yield production with little change between two irrigation regimes.
- Taxon
- Poa pratensis L.Poa pratensise0
- Material
- “Ciakhor”, “Damavand”, “Karvandan”, “Basmenj”, “Abr2”, “Abrumand”, “Borhan”, “Hezarkanian”, “LasemCheshmeh”, “Torshab”, and “DoSar”e6
- Outcome
- forage yield productione6
- Direction
- highere6
- Qualifier
- little change between two irrigation regimese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Evaluation of the effects of water-limited conditions on the photosynthetic characteristics and forage yield is important for enhancing the forage productivity and drought tolerance in Kentucky bluegrass ( Poa pratensis L.)”
e6“Overall, the results showed that “Ciakhor”, “Damavand”, “Karvandan”, “Basmenj”, “Abr2”, “Abrumand”, “Borhan”, “Hezarkanian”, “LasemCheshmeh”, “Torshab”, and “DoSar” have higher forage yield production with little change between two irrigation regimes, which makes them promising candidates for developing high-yielding drought-tolerant varieties through breeding programs”
Claim · model-written summary
The named ecotypes are promising candidates for developing high-yielding drought-tolerant varieties through breeding programs.
- Taxon
- Poa pratensis L.Poa pratensise0
- Outcome
- developing high-yielding drought-tolerant varietiese6
- Qualifier
- through breeding programse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Evaluation of the effects of water-limited conditions on the photosynthetic characteristics and forage yield is important for enhancing the forage productivity and drought tolerance in Kentucky bluegrass ( Poa pratensis L.)”
e6“Overall, the results showed that “Ciakhor”, “Damavand”, “Karvandan”, “Basmenj”, “Abr2”, “Abrumand”, “Borhan”, “Hezarkanian”, “LasemCheshmeh”, “Torshab”, and “DoSar” have higher forage yield production with little change between two irrigation regimes, which makes them promising candidates for developing high-yielding drought-tolerant varieties through breeding programs”
The same questions in other papers
drought · physiology: photosynthesis · Poa pratensis (Kentucky bluegrass)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
4 papers more in this group
See all 8 papers →drought · yield · Poa pratensis (Kentucky bluegrass)Results agree
1 paper in the same direction as this paper
- negative
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.