Abstract
As a result of the world population and climate change impact increases (especially in arid environments), there is a critical need for high-yield, drought-tolerant wheat. Synthetic hexaploid wheat derived lines (SHW-DL), were created artificially by crossing different durum wheat cultivars (AABB) with accessions of Aegilops tauschii (DD), a beneficial source of new genes for common bread wheat ( Triticum aestivum L). Here, we studied the response of a panel of 91 SHW-DL for drought tolerance based on physiological, antioxidant enzyme activities, and drought tolerance indices. A wide range of variation and high values of heritability observed for grain yield, physiological and antioxidant traits indicating that the SHW-DL panel constitutes a valuable gene source for drought tolerance improvement of wheat. Despite decreases in grain yield (YLD), leaf area index (LAI), and relative water content (RWC) an increase in the content of malondialdehyde (MDA) was observed. Moreover, drought streass increased the antioxidant enzyme activities of ascorbate peroxidase (APX), catalase (CAT) and peroxidase (POD), and also photosynthetic pigments, proline (Pro), and MDA content. With higher values of grain yield, physiological and biochemical traits such as photosynthetic pigments, and RWC, and lower content of MDA, and peroxidase (H 2 O 2 ) activity, SHW-DL performed better compared to common wheat lines under water stress conditions. Different responses to water stress within the germplasm and between synthetic and common wheat suggest that selection for adaptive and suitable genotypes is possible for drought tolerance in synthetic wheat germplasm. Genotypes 54, 98, 102, 105, 122, 124, 143, 159, 196, and 198 were identified to be directly used in breeding programs or indirectly by crossing them with other wheat germplasm collections.
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Claims 8
Claim · model-written summary
SHW-DL showed broad variation and high heritability in yield, physiological and antioxidant traits.
- Taxon
- wheat
Triticum aestivumt0 - Material
- SHW-DLe0
- Outcome
- heritabilitye0
- Direction
- high valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A wide range of variation and high values of heritability observed for grain yield, physiological and antioxidant traits indicating that the SHW-DL panel”
t0“wheat”
Claim · model-written summary
Drought decreased grain yield, leaf area index and relative water content.
- Taxon
- wheatTriticum aestivume0
- Treatment
- droughte0
- Outcome
- grain yield (YLD), leaf area index (LAI), and relative water content (RWC)e0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought tolerance improvement of wheat. Despite decreases in grain yield (YLD), leaf area index (LAI), and relative water content (RWC)”
Claim · model-written summary
Drought increased MDA content.
- Taxon
- wheatTriticum aestivume0
- Treatment
- droughte0
- Outcome
- content of malondialdehyde (MDA)e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought tolerance improvement of wheat. Despite decreases in grain yield (YLD), leaf area index (LAI), and relative water content (RWC) an increase in the content of malondialdehyde (MDA) was observed”
Claim · model-written summary
Drought increased APX, CAT and POD activities.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- drought streasse0
- Outcome
- antioxidant enzyme activities of ascorbate peroxidase (APX), catalase (CAT) and peroxidase (POD)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought streass increased the antioxidant enzyme activities of ascorbate peroxidase (APX), catalase (CAT) and peroxidase (POD)”
t0“wheat”
Claim · model-written summary
Drought increased photosynthetic pigments and proline.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- drought streasse0
- Outcome
- photosynthetic pigments, proline (Pro)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought streass increased the antioxidant enzyme activities of ascorbate peroxidase (APX), catalase (CAT) and peroxidase (POD), and also photosynthetic pigments, proline (Pro), and MDA content”
t0“wheat”
Claim · model-written summary
SHW-DL had higher grain yield, photosynthetic pigments and RWC than common wheat under water stress.
- Taxon
- wheatTriticum aestivume0
- Material
- SHW-DLe0
- Outcome
- grain yield, physiological and biochemical traits such as photosynthetic pigments, and RWCe0
- Direction
- highere0
- Comparator
- common wheat linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With higher values of grain yield, physiological and biochemical traits such as photosynthetic pigments, and RWC, and lower content of MDA, and peroxidase (H 2 O 2 ) activity, SHW-DL performed better compared to common wheat lines under water stress conditions.”
Claim · model-written summary
SHW-DL had lower MDA and peroxidase activity than common wheat under water stress.
- Taxon
- wheatTriticum aestivume0
- Material
- SHW-DLe0
- Outcome
- MDA, and peroxidase (H 2 O 2 ) activitye0
- Direction
- lowere0
- Comparator
- common wheat linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With higher values of grain yield, physiological and biochemical traits such as photosynthetic pigments, and RWC, and lower content of MDA, and peroxidase (H 2 O 2 ) activity, SHW-DL performed better compared to common wheat lines under water stress conditions.”
Claim · model-written summary
Ten genotypes were identified for direct or indirect breeding use.
- Taxon
- wheatTriticum aestivume0
- Material
- Genotypes 54, 98, 102, 105, 122, 124, 143, 159, 196, and 198e0
- Outcome
- directly used in breeding programs or indirectly by crossing them with other wheat germplasm collectionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes 54, 98, 102, 105, 122, 124, 143, 159, 196, and 198 were identified to be directly used in breeding programs or indirectly by crossing them with other wheat germplasm collections.”
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