Abstract
High temperature (HT, heat) stress is detrimental to wheat (Triticum aestivum L.) production. Wild relatives of bread wheat may offer sources of HT stress tolerance genes because they grow in stressed habitats. Wheat chromosome translocation lines, produced by introgressing small segments of chromosome from wild relatives to bread wheat, were evaluated for tolerance to HT stress during the grain filling stage. Sixteen translocation lines and four wheat cultivars were grown at optimum temperature (OT) of 22/14°C (day/night). Ten days after anthesis, half of the plants were exposed to HT stress of 34/26°C for 16 d, and other half remained at OT. Results showed that HT stress decreased grain yield by 43% compared with OT. Decrease in individual grain weight (by 44%) was the main reason for yield decline at HT. High temperature stress had adverse effects on leaf chlorophyll content and Fv/Fm; and a significant decrease in Fv/Fm was associated with a decline in individual grain weight. Based on the heat response (heat susceptibility indices, HSIs) of physiological and yield traits to each other and to yield HSI, TA5594, TA5617, and TA5088 were highly tolerant and TA5637 and TA5640 were highly susceptible to HT stress. Our results suggest that change in Fv/Fm is a highly useful trait in screening genotypes for HT stress tolerance. This study showed that there is genetic variability among wheat chromosome translocation lines for HT stress tolerance at the grain filling stage and we suggest further screening of a larger set of translocation lines.
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Claims 13
Claim · model-written summary
Heat stress decreased wheat grain yield by 43% relative to optimum temperature.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- HT stresse0
- Outcome
- grain yielde0
- Direction
- decreasede0
- Value
- 43%e0
- Comparator
- OTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HT stress decreased grain yield by 43% compared with OT”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Heat stress decreased individual wheat grain weight by 44%.
- Taxon
- wheatTriticum aestivume1
- Treatment
- HTe0
- Outcome
- individual grain weighte0
- Direction
- Decreasee0
- Value
- 44%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decrease in individual grain weight (by 44%) was the main reason for yield decline at HT”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
High temperature stress adversely affected wheat leaf chlorophyll content.
- Taxon
- wheatTriticum aestivume1
- Treatment
- High temperature stresse0
- Outcome
- leaf chlorophyll contente0
- Direction
- adverse effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature stress had adverse effects on leaf chlorophyll content and Fv/Fm”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
High temperature stress adversely affected wheat Fv/Fm.
- Taxon
- wheatTriticum aestivume1
- Treatment
- High temperature stresse0
- Outcome
- Fv/Fme0
- Direction
- adverse effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature stress had adverse effects on leaf chlorophyll content and Fv/Fm”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
A significant decline in Fv/Fm was associated with reduced individual grain weight.
- Taxon
- wheatTriticum aestivume1
- Outcome
- individual grain weighte0
- Direction
- declinee0
- Qualifier
- significant decrease in Fv/Fme0
- Comparator
- Fv/Fme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant decrease in Fv/Fm was associated with a decline in individual grain weight”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
TA5594 was highly tolerant to heat stress.
- Taxon
- wheatTriticum aestivume1
- Material
- TA5594e0
- Outcome
- highly tolerante0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TA5594, TA5617, and TA5088 were highly tolerant and TA5637 and TA5640 were highly susceptible to HT stress”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
TA5617 was highly tolerant to heat stress.
- Taxon
- wheatTriticum aestivume1
- Material
- TA5617e0
- Outcome
- highly tolerante0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TA5594, TA5617, and TA5088 were highly tolerant and TA5637 and TA5640 were highly susceptible to HT stress”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
TA5088 was highly tolerant to heat stress.
- Taxon
- wheatTriticum aestivume1
- Material
- TA5088e0
- Outcome
- highly tolerante0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TA5594, TA5617, and TA5088 were highly tolerant and TA5637 and TA5640 were highly susceptible to HT stress”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
TA5637 was highly susceptible to heat stress.
- Taxon
- wheatTriticum aestivume1
- Material
- TA5637e0
- Outcome
- highly susceptiblee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TA5594, TA5617, and TA5088 were highly tolerant and TA5637 and TA5640 were highly susceptible to HT stress”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
TA5640 was highly susceptible to heat stress.
- Taxon
- wheatTriticum aestivume1
- Material
- TA5640e0
- Outcome
- highly susceptiblee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TA5594, TA5617, and TA5088 were highly tolerant and TA5637 and TA5640 were highly susceptible to HT stress”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Change in Fv/Fm was judged useful for screening genotypes for heat stress tolerance.
- Taxon
- wheatTriticum aestivume1
- Outcome
- highly useful trait in screening genotypes for HT stress tolerancee0
- Comparator
- Fv/Fme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“change in Fv/Fm is a highly useful trait in screening genotypes for HT stress tolerance”
e1“wheat (Triticum aestivum L.)”
Claim · model-written summary
Wheat translocation lines showed genetic variability in heat tolerance at grain filling.
- Taxon
- wheatTriticum aestivume0
- Material
- wheat chromosome translocation linese0
- Organ / stage
- grain filling stagee0
- Outcome
- genetic variabilitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is genetic variability among wheat chromosome translocation lines for HT stress tolerance at the grain filling stage”
Claim · model-written summary
The authors suggest screening a larger set of translocation lines.
- Taxon
- wheatTriticum aestivume1
- Outcome
- further screening of a larger set of translocation linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we suggest further screening of a larger set of translocation lines”
e1“wheat (Triticum aestivum L.)”
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