Abstract
This study was performed to investigate the effects of drought stress on agronomic traits, post-drought recovery, and survival of tall fescue genotypes in the Research Farm of the Isfahan University of Technology located in Lavark, Najafabad, central Iran. In this study, 67 tall fescue genotypes, including three groups of the early, medium, and late in terms of flowering were studied. All genotypes were fully irrigated after planting for two years (2016-2017) and then in the third and fourth years (2018-2019) were examined under three irrigation environments including normal water (50% moisture depletion) mild drought stress (70% moisture depletion), and intense drought stress (90% moisture depletion). Morphological and performance traits were examined. In the summer of the fourth year (2019) after the summer harvest, irrigation was stopped in all drought stress levels for two months. Then the plants were irrigated again for six weeks, and after regrowth, recovery-related traits were evaluated. High genetic diversity was observed among tall fescue genotypes for all measured traits. The results showed that drought stress had adverse effects on forage yield and yield components, recovery traits, and survival. Prolonged drought stress changed the relationships between different traits. Significant positive correlation between the forage yield and recovery rate with drought tolerance indicated that these traits could be used as appropriate selection criteria to increase forage yield and identify superior genotypes in arid and semi-arid regions. The results of this study indicated low to moderate summer dormancy (incomplete summer dormancy) in this germplasm. Negative correlation of functional and stress tolerance traits with day to recovery under drought stress conditions showed that drought tolerant genotypes will have faster recovery than other genotypes. The results showed that some late flowering genotypes (such as 3L, 18L and 11L) are valuable gene sources for forage production. Drought tolerant genotypes with suitable yield in three flowering groups were identified using the biplot and principal component analysis method. These genotypes can be useful for breeding programs in future studies.
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Claims 9
Claim · model-written summary
Tall fescue genotypes showed high genetic diversity for all measured traits.
- Taxon
- tall fescue
Lolium arundinaceume0 - Material
- genotypese0
- Outcome
- genetic diversitye0
- Direction
- Highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High genetic diversity was observed among tall fescue genotypes for all measured traits.”
Claim · model-written summary
Drought adversely affected forage yield and yield components.
- Taxon
- tall fescueLolium arundinaceumt0
- Treatment
- drought stresse0
- Outcome
- forage yield and yield componentse0
- Direction
- adverse effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that drought stress had adverse effects on forage yield and yield components, recovery traits, and survival.”
t0“Tall Fescue”
Claim · model-written summary
Drought adversely affected recovery traits and survival.
- Taxon
- tall fescueLolium arundinaceumt0
- Treatment
- drought stresse0
- Outcome
- recovery traits, and survivale0
- Direction
- adverse effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that drought stress had adverse effects on forage yield and yield components, recovery traits, and survival.”
t0“Tall Fescue”
Claim · model-written summary
Prolonged drought altered relationships between tall fescue traits.
- Taxon
- tall fescueLolium arundinaceumt0
- Treatment
- Prolonged drought stresse0
- Outcome
- relationships between different traitse0
- Direction
- changede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Prolonged drought stress changed the relationships between different traits.”
t0“Tall Fescue”
Claim · model-written summary
Forage yield and recovery rate correlated positively with drought tolerance.
- Taxon
- tall fescueLolium arundinaceumt0
- Outcome
- forage yield and recovery ratee0
- Direction
- positive correlatione0
- Comparator
- drought tolerancee0
- Setting
- arid and semi-arid regionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant positive correlation between the forage yield and recovery rate with drought tolerance indicated that these traits could be used as appropriate selection criteria to increase forage yield and identify superior genotypes in arid and semi-arid regions.”
t0“Tall Fescue”
Claim · model-written summary
The germplasm had low to moderate, incomplete summer dormancy.
- Taxon
- tall fescueLolium arundinaceumt0
- Outcome
- summer dormancye0
- Direction
- low to moderatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results of this study indicated low to moderate summer dormancy (incomplete summer dormancy) in this germplasm.”
t0“Tall Fescue”
Claim · model-written summary
Functional and stress tolerance traits correlated negatively with days to recovery under drought.
- Taxon
- tall fescueLolium arundinaceumt0
- Treatment
- drought stress conditionse0
- Outcome
- day to recoverye0
- Direction
- Negative correlatione0
- Comparator
- functional and stress tolerance traitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Negative correlation of functional and stress tolerance traits with day to recovery under drought stress conditions showed that drought tolerant genotypes will have faster recovery than other genotypes.”
t0“Tall Fescue”
Claim · model-written summary
Late flowering genotypes 3L, 18L and 11L were valuable sources for forage production.
- Taxon
- tall fescueLolium arundinaceumt0
- Material
- 3L, 18L and 11Le0
- Outcome
- valuable gene sources for forage productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results showed that some late flowering genotypes (such as 3L, 18L and 11L) are valuable gene sources for forage production.”
t0“Tall Fescue”
Claim · model-written summary
Biplot and principal component analysis identified drought tolerant genotypes with suitable yield across three flowering groups.
- Taxon
- tall fescueLolium arundinaceumt0
- Outcome
- Drought tolerant genotypes with suitable yielde0
- Comparator
- three flowering groupse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought tolerant genotypes with suitable yield in three flowering groups were identified using the biplot and principal component analysis method.”
t0“Tall Fescue”
The same questions in other papers
drought · yield · Lolium arundinaceum (tall fescue)Results differ
12 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- negative
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