Abstract
Evaluation of forage yield and antioxidant activity in Poa pratensis with high quality and good spring green-up forage might help variety improvement for use under water deficit condition. Germplasm and phenotypic diversity evaluations lay a foundation for genotype selection and improvement of varieties for drought tolerance in P. pratensis. The present study was conducted to assess the genetic potential of a collection of P. pratensis accessions for drought stress and to identify the association between polyphenol compounds and forage yield traits. Vegetative clone samples of 100 accessions collected from a diverse geographical area of Iran were clonally propagated in a greenhouse and evaluated in the field under two moisture regimes (non-stress and drought stress) in 2018 and 2019. Drought stress had negative effects on fresh and dry forage yields and reduced phenotypic variances. On average, drought stress reduced fresh and dry forage yields by 45% and 28%, respectively. The results of Mantel test showed no significant correlation between forage yield traits and geographical distances. Genetic coefficients of variation for forage yield and most of the phytochemicals were lower under drought stress, suggesting that deficit irrigation may reduce genetic variation for the tested traits. The estimates of heritability were higher under non-stress conditions than under drought stress treatment for forage yield traits and few polyphenols. However, the majority of polyphenol compounds had higher heritability than forage yield traits under drought stress, which suggests the potential for indirect selection. The 'Ciakhor', 'Damavand', 'Karvandan', 'Abrumand', and 'Abr2' accessions had high quantities for polyphenols and yield traits under both moisture regimes. These accessions are promising candidates for use in variety crossing programs and for developing high-yielding varieties under water-deficit conditions.
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Claims 9
Claim · model-written summary
Drought reduced fresh forage yield by 45%.
- Taxon
- Poa pratensis
.jpg?width=60)
Poa pratensist0 - Treatment
- drought stresse0
- Outcome
- forage yieldse0
- Direction
- reducede0
- Value
- 45%e0
- Qualifier
- freshe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“drought stress reduced fresh and dry forage yields by 45% and 28%, respectively”
t0“Poa pratensis”
Claim · model-written summary
Drought reduced dry forage yield by 28%.
- Taxon
- Poa pratensisPoa pratensist0
- Treatment
- drought stresse0
- Outcome
- dry forage yieldse0
- Direction
- reducede0
- Value
- 28%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress reduced fresh and dry forage yields by 45% and 28%, respectively”
t0“Poa pratensis”
Claim · model-written summary
Drought reduced phenotypic variances.
- Taxon
- Poa pratensisPoa pratensist0
- Treatment
- Drought stresse0
- Outcome
- phenotypic variancese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress had negative effects on fresh and dry forage yields and reduced phenotypic variances”
t0“Poa pratensis”
Claim · model-written summary
Forage yield traits did not correlate significantly with geographical distance.
- Taxon
- Poa pratensisPoa pratensist0
- Outcome
- forage yield traitse0
- Direction
- no significant correlatione0
- Setting
- geographical distancese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant correlation between forage yield traits and geographical distances”
t0“Poa pratensis”
Claim · model-written summary
Genetic coefficients of variation for forage yield and most phytochemicals were lower under drought.
- Taxon
- Poa pratensisPoa pratensist0
- Treatment
- drought stresse0
- Outcome
- Genetic coefficients of variation for forage yield and most of the phytochemicalse0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genetic coefficients of variation for forage yield and most of the phytochemicals were lower under drought stress”
t0“Poa pratensis”
Claim · model-written summary
Heritability for forage yield traits and a few polyphenols was higher without stress.
- Taxon
- Poa pratensisPoa pratensist0
- Treatment
- drought stress treatmente0
- Outcome
- estimates of heritabilitye0
- Direction
- highere0
- Comparator
- non-stress conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“estimates of heritability were higher under non-stress conditions than under drought stress treatment for forage yield traits and few polyphenols”
t0“Poa pratensis”
Claim · model-written summary
Most polyphenols had higher heritability than forage yield traits under drought.
- Taxon
- Poa pratensisPoa pratensist0
- Treatment
- drought stresse0
- Outcome
- heritabilitye0
- Direction
- highere0
- Comparator
- forage yield traitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“majority of polyphenol compounds had higher heritability than forage yield traits under drought stress”
t0“Poa pratensis”
Claim · model-written summary
Five named accessions had high polyphenol quantities and yield traits under both moisture regimes.
- Taxon
- Poa pratensisPoa pratensist0
- Material
- 'Ciakhor', 'Damavand', 'Karvandan', 'Abrumand', and 'Abr2'e0
- Outcome
- polyphenols and yield traitse0
- Direction
- highe0
- Qualifier
- both moisture regimese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The 'Ciakhor', 'Damavand', 'Karvandan', 'Abrumand', and 'Abr2' accessions had high quantities for polyphenols and yield traits under both moisture regimes”
t0“Poa pratensis”
Claim · model-written summary
The five named accessions were recommended as crossing candidates for drought adapted, high yielding varieties.
- Taxon
- Poa pratensisPoa pratensist0
- Outcome
- promising candidates for use in variety crossing programs and for developing high-yielding varieties under water-deficit conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These accessions are promising candidates for use in variety crossing programs and for developing high-yielding varieties under water-deficit conditions”
t0“Poa pratensis”
The same questions in other 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.