Abstract
Cultivation of drought adapted genotypes is the best approach to avoid yield loss under water deficit condition. In order to screen for drought tolerance 82 Iranian wheat genotypes were evaluated by recording relative water content (RWC), days to maturity, leaf rolling and leaf silvering under stress condition in a field trial. In next experiment ten genotypes (six tolerant and four sensitive) selected from field experiment were assessed for drought adaptability measuring RWC, osmotic adjustment (OA), catalase (CAT) and peroxidase (POD) activity and stomatal characteristics. The genotypes were grown under normal and stress condition with three replications. There was high variability among genotypes in response to drought. Azadi and Ohadi showed significant enhancement in CAT activity while in POD activity maximum increase was recorded for Homa. Kohdasht (0.59MPa) and Arta (0.15MPa) had the highest and lowest OA, respectively. Higher OA ability indicates the potential for accumulating osmolytes in cells to absorb water more easily under stress condition. Stomatal closure in response to drought was more significant in Kohdasht and Arta while in Homa almost no change in stomatal closure was detected. Significant negative correlation (r = -0.65, p<0.05) was obtained between RWC and stomatal opening implying the dominance of stomatal conductance control for water retention in genotypes with higher RWC. The activity of POD in Homa, a drought sensitive genotype, was significantly high under stress condition. Presumably the scavenging of H2O2 may be the last defense barrier of this genotype against drought. Kohdasht had the highest ability of water retention under stress condition mostly due to its excellent OA and stomatal closure. These physiological characters can be transferred to high yield genotypes to improve drought adaptability.
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Claims 14
Claim · model-written summary
Wheat genotypes varied strongly in drought response.
- Taxon
- wheat
Triticum aestivumt0 - Outcome
- variability among genotypes in response to droughte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was high variability among genotypes in response to drought”
t0“wheat genotypes”
Claim · model-written summary
Azadi CAT activity increased significantly.
- Taxon
- wheatTriticum aestivumt0
- Material
- Azadie0
- Treatment
- stress conditione1
- Outcome
- CAT activitye0
- Direction
- enhancemente0
- Comparator
- normale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Azadi and Ohadi showed significant enhancement in CAT activity”
e1“under normal and stress condition”
t0“wheat genotypes”
Claim · model-written summary
Ohadi CAT activity increased significantly.
- Taxon
- wheatTriticum aestivumt0
- Material
- Ohadie0
- Treatment
- stress conditione1
- Outcome
- CAT activitye0
- Direction
- enhancemente0
- Comparator
- normale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Azadi and Ohadi showed significant enhancement in CAT activity”
e1“under normal and stress condition”
t0“wheat genotypes”
Claim · model-written summary
Homa had the maximum POD activity increase.
- Taxon
- wheatTriticum aestivumt0
- Material
- Homae0
- Treatment
- stress conditione1
- Outcome
- POD activitye0
- Direction
- maximum increasee0
- Comparator
- normale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in POD activity maximum increase was recorded for Homa”
e1“under normal and stress condition”
t0“wheat genotypes”
Claim · model-written summary
Kohdasht had the highest osmotic adjustment, 0.59MPa.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kohdasht (0.59MPa) and Arta (0.15MPa) had the highest and lowest OA, respectively”
t0“wheat genotypes”
Claim · model-written summary
Arta had the lowest osmotic adjustment, 0.15MPa.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kohdasht (0.59MPa) and Arta (0.15MPa) had the highest and lowest OA, respectively”
t0“wheat genotypes”
Claim · model-written summary
Drought induced more significant stomatal closure in Kohdasht.
- Taxon
- wheatTriticum aestivumt0
- Material
- Kohdashte0
- Treatment
- droughte0
- Outcome
- Stomatal closuree0
- Direction
- moree0
- Comparator
- normale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomatal closure in response to drought was more significant in Kohdasht and Arta”
e1“under normal and stress condition”
t0“wheat genotypes”
Claim · model-written summary
Drought induced more significant stomatal closure in Arta.
- Taxon
- wheatTriticum aestivumt0
- Material
- Artae0
- Treatment
- droughte0
- Outcome
- Stomatal closuree0
- Direction
- moree0
- Comparator
- normale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomatal closure in response to drought was more significant in Kohdasht and Arta”
e1“under normal and stress condition”
t0“wheat genotypes”
Claim · model-written summary
Homa showed almost no change in stomatal closure.
- Taxon
- wheatTriticum aestivumt0
- Material
- Homae0
- Treatment
- stress conditione1
- Outcome
- stomatal closuree0
- Direction
- no changee0
- Comparator
- normale1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Homa almost no change in stomatal closure was detected”
e1“under normal and stress condition”
t0“wheat genotypes”
Claim · model-written summary
Relative water content and stomatal opening were negatively correlated (r = -0.65, p<0.05).
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- stomatal openinge0
- Outcome
- RWCe0
- Direction
- negativee0
- Value
- r = -0.65e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant negative correlation (r = -0.65, p<0.05) was obtained between RWC and stomatal opening”
t0“wheat genotypes”
Claim · model-written summary
Homa POD activity was significantly high under stress.
- Taxon
- wheatTriticum aestivumt0
- Material
- Homae0
- Treatment
- stress conditione0
- Outcome
- activity of PODe0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity of POD in Homa, a drought sensitive genotype, was significantly high under stress condition”
t0“wheat genotypes”
Claim · model-written summary
Kohdasht had the highest water retention under stress.
- Taxon
- wheatTriticum aestivumt0
- Material
- Kohdashte0
- Treatment
- stress conditione0
- Outcome
- ability of water retentione0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kohdasht had the highest ability of water retention under stress condition”
t0“wheat genotypes”
Claim · model-written summary
Authors attribute Kohdasht water retention mostly to osmotic adjustment and stomatal closure.
- Taxon
- wheatTriticum aestivumt0
- Material
- Kohdashte1
- Outcome
- ability of water retentione1
- Qualifier
- excellent OA and stomatal closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mostly due to its excellent OA and stomatal closure”
e1“Kohdasht had the highest ability of water retention under stress condition”
t0“wheat genotypes”
Claim · model-written summary
Authors suggest transferring these physiological characters to high yield genotypes.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- transferred to high yield genotypes to improve drought adaptabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These physiological characters can be transferred to high yield genotypes to improve drought adaptability”
t0“wheat genotypes”
The same questions in other papers
drought · physiology: gas exchange · Triticum aestivum (wheat)Positive and negative results
4 papers in the same direction as this paper · 71 in the opposite direction
- negative
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