Abstract
L.) is widely grown in sub-tropical and tropical areas and, as such, it is exposed to heatstress especially during the grain filling period (GFP). Global warming has further affected its production and productivity in these heat-stressed environments. We examined the effects of heatstress on 18 morpho-physiological and yield-related traits in 96 bread wheat accessions. Heat stress decreased crop growth and GFP, and consequently reduced morphological and yield-related traits in the delayed sown crop. A low heat susceptibility index and high yield stability were used for selecting tolerant accessions. Under heatstress, the days to 50% anthesis, flag-leaf area, chlorophyll content, normalized difference vegetation index (NDVI), thousand grain weight (TGW), harvest index and grain yield were significantly reduced both in tolerant and susceptible accessions. The reduction was severe in susceptible accessions (48.2% grain yield reduction in IC277741). The plant height, peduncle length and spike length showeda significant reduction in susceptible accessions, but a non-significant reduction in the tolerant accessions under the heatstress. The physiological traits like the canopy temperature depression (CTD), plant waxiness and leaf rolling were increased in tolerant accessions under heatstress. Scanning electron microscopy of matured wheat grains revealed ultrastructural changes in endosperm and aleurone cells due to heat stress. The reduction in size and density of large starch granules is the major cause of the yield and TGW decrease in the heat-stress-susceptible accessions. The most stable and high-yielding accessions, namely, IC566223, IC128454, IC335792, EC576707, IC535176, IC529207, IC446713 and IC416019 were identified as the climate-smart germplasm lines. We selected germplasm lines possessing desirable traits as potential parents for the development of bi-parent and multi-parent mapping populations.
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Claims 12
Claim · model-written summary
Heat stress decreased crop growth and grain filling period in delayed-sown wheat.
- Taxon
- Bread Wheat
Triticum aestivumt0 - Treatment
- Heat stresse0
- Outcome
- crop growth and GFPe0
- Direction
- decreasede0
- Qualifier
- delayed sown crope1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress decreased crop growth and GFP”
e1“in the delayed sown crop”
t0“Bread Wheat”
Claim · model-written summary
Heat stress reduced morphological and yield-related traits in the delayed-sown crop.
- Taxon
- Bread WheatTriticum aestivumt0
- Treatment
- Heat stresse1
- Outcome
- morphological and yield-related traitse0
- Direction
- reducede0
- Qualifier
- delayed sown crope0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced morphological and yield-related traits in the delayed sown crop”
e1“Heat stress decreased crop growth and GFP”
t0“Bread Wheat”
Claim · model-written summary
Under heat stress, days to 50% anthesis, flag-leaf area and chlorophyll content were significantly reduced in tolerant and susceptible accessions.
- Taxon
- Bread WheatTriticum aestivumt0
- Treatment
- heatstresse0
- Outcome
- days to 50% anthesis, flag-leaf area, chlorophyll contente0
- Direction
- reducede0
- Qualifier
- both in tolerant and susceptible accessionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under heatstress, the days to 50% anthesis, flag-leaf area, chlorophyll content, normalized difference vegetation index (NDVI), thousand grain weight (TGW), harvest index and grain yield were significantly reduced both in tolerant and susceptible accessions.”
t0“Bread Wheat”
Claim · model-written summary
Under heat stress, NDVI, thousand grain weight and harvest index were significantly reduced in tolerant and susceptible accessions.
- Taxon
- Bread WheatTriticum aestivumt0
- Treatment
- heatstresse0
- Outcome
- normalized difference vegetation index (NDVI), thousand grain weight (TGW), harvest indexe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under heatstress, the days to 50% anthesis, flag-leaf area, chlorophyll content, normalized difference vegetation index (NDVI), thousand grain weight (TGW), harvest index and grain yield were significantly reduced both in tolerant and susceptible accessions.”
t0“Bread Wheat”
Claim · model-written summary
Under heat stress, grain yield was significantly reduced in tolerant and susceptible accessions.
- Taxon
- Bread WheatTriticum aestivumt0
- Treatment
- heatstresse0
- Outcome
- grain yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under heatstress, the days to 50% anthesis, flag-leaf area, chlorophyll content, normalized difference vegetation index (NDVI), thousand grain weight (TGW), harvest index and grain yield were significantly reduced both in tolerant and susceptible accessions.”
t0“Bread Wheat”
Claim · model-written summary
Grain yield reduction was more severe in susceptible accession IC277741, at 48.2%.
- Taxon
- Bread WheatTriticum aestivumt0
- Material
- IC277741e0
- Outcome
- grain yield reductione0
- Direction
- reductione0
- Value
- 48.2%e0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction was severe in susceptible accessions (48.2% grain yield reduction in IC277741).”
t0“Bread Wheat”
Claim · model-written summary
Under heat stress, plant height, peduncle length and spike length fell significantly in susceptible accessions.
- Taxon
- Bread WheatTriticum aestivumt0
- Treatment
- heatstresse0
- Outcome
- plant height, peduncle length and spike lengthe0
- Direction
- reductione0
- Qualifier
- susceptible accessionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant height, peduncle length and spike length showeda significant reduction in susceptible accessions, but a non-significant reduction in the tolerant accessions under the heatstress.”
t0“Bread Wheat”
Claim · model-written summary
Under heat stress, plant height, peduncle length and spike length fell nonsignificantly in tolerant accessions.
- Taxon
- Bread WheatTriticum aestivumt0
- Treatment
- heatstresse0
- Outcome
- plant height, peduncle length and spike lengthe0
- Direction
- reductione0
- Qualifier
- tolerant accessionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant height, peduncle length and spike length showeda significant reduction in susceptible accessions, but a non-significant reduction in the tolerant accessions under the heatstress.”
t0“Bread Wheat”
Claim · model-written summary
Canopy temperature depression, waxiness and leaf rolling increased in tolerant accessions under heat stress.
- Taxon
- Bread WheatTriticum aestivumt0
- Treatment
- heatstresse0
- Outcome
- canopy temperature depression (CTD), plant waxiness and leaf rollinge0
- Direction
- increasede0
- Qualifier
- tolerant accessionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The physiological traits like the canopy temperature depression (CTD), plant waxiness and leaf rolling were increased in tolerant accessions under heatstress.”
t0“Bread Wheat”
Claim · model-written summary
Heat stress changed endosperm and aleurone cell ultrastructure in mature wheat grain.
- Taxon
- Bread WheatTriticum aestivumt0
- Treatment
- heat stresse0
- Outcome
- ultrastructural changes in endosperm and aleurone cellse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scanning electron microscopy of matured wheat grains revealed ultrastructural changes in endosperm and aleurone cells due to heat stress.”
t0“Bread Wheat”
Claim · model-written summary
Reduced size and density of large starch granules were identified as the major cause of lower yield and thousand grain weight in susceptible accessions.
- Taxon
- Bread WheatTriticum aestivumt0
- Outcome
- yield and TGW decreasee0
- Qualifier
- reduction in size and density of large starch granulese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in size and density of large starch granules is the major cause of the yield and TGW decrease in the heat-stress-susceptible accessions.”
t0“Bread Wheat”
Claim · model-written summary
Eight accessions were identified as stable, high-yielding climate-smart germplasm lines.
- Taxon
- Bread WheatTriticum aestivumt0
- Material
- IC566223, IC128454, IC335792, EC576707, IC535176, IC529207, IC446713 and IC416019e0
- Outcome
- climate-smart germplasm linese0
- Comparator
- most stable and high-yielding accessionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most stable and high-yielding accessions, namely, IC566223, IC128454, IC335792, EC576707, IC535176, IC529207, IC446713 and IC416019 were identified as the climate-smart germplasm lines.”
t0“Bread Wheat”
The same questions in other papers
heat · yield · Triticum aestivum (wheat)Positive and negative results
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