Abstract
Exposure to temperatures ≥30°C during flowering and grain filling stages can negatively affect seed set and seed weight in spring wheat ( Triticum aestivum L.). The screening of a large set of germplasm under hot wheat growing environments (Indo‐Gangetic Plain in India) led to the identification of promising heat‐tolerant genotypes. The selected set of 28 diverse spring wheat genotypes were exposed to heat stress (34/16°C day/night temperatures) for 10 d during flowering and for 30 d during grain filling to quantify genetic variability in pollen germination, photosynthesis, and yield parameters under controlled‐environment conditions. Pollen grains collected immediately at anthesis (between 0530 and 0630 h) were incubated on liquid in vitro pollen germination media. Averaged across wheat genotypes, a significant reduction in pollen germination (39.9%, P < 0.001) was recorded from plants exposed to heat stress. Heat stress for 10 d during flowering induced significant reduction in seed number (15.4 and 23.0%) and seed weight (32.3 and 34.6%) on main and primary spikes, respectively, compared with the control. Heat stress during grain filling had a more pronounced impact on seed weight (16 and 22%) than seed number (2.7 and 9.3%) in main and primary spikes, respectively. Genotypes KSG025 and KSG1214 with higher seed number, seed weight, and harvest index and appreciable pollen germination under heat stress were identified as candidate donors for simultaneously enhancing flowering and post‐flowering heat tolerance in spring wheat.
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Claims 11
Claim · model-written summary
Heat stress reduced pollen germination by 39.9% across wheat genotypes.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- heat stresse0
- Outcome
- pollen germinatione0
- Direction
- reductione0
- Value
- 39.9%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Averaged across wheat genotypes, a significant reduction in pollen germination (39.9%, P < 0.001) was recorded from plants exposed to heat stress.”
Claim · model-written summary
Flowering heat reduced main-spike seed number by 15.4%.
- Taxon
- spring wheatTriticum aestivumt0
- Organ / stage
- maine0
- Treatment
- Heat stress for 10 d during floweringe0
- Outcome
- seed numbere0
- Direction
- reductione0
- Value
- 15.4e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress for 10 d during flowering induced significant reduction in seed number (15.4 and 23.0%) and seed weight (32.3 and 34.6%) on main and primary spikes, respectively, compared with the control.”
t0“spring wheat”
Claim · model-written summary
Flowering heat reduced primary-spike seed number by 23.0%.
- Taxon
- spring wheatTriticum aestivumt0
- Organ / stage
- primary spikese0
- Treatment
- Heat stress for 10 d during floweringe0
- Outcome
- seed numbere0
- Direction
- reductione0
- Value
- 23.0%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress for 10 d during flowering induced significant reduction in seed number (15.4 and 23.0%) and seed weight (32.3 and 34.6%) on main and primary spikes, respectively, compared with the control.”
t0“spring wheat”
Claim · model-written summary
Flowering heat reduced main-spike seed weight by 32.3%.
- Taxon
- spring wheatTriticum aestivumt0
- Organ / stage
- maine0
- Treatment
- Heat stress for 10 d during floweringe0
- Outcome
- seed weighte0
- Direction
- reductione0
- Value
- 32.3e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress for 10 d during flowering induced significant reduction in seed number (15.4 and 23.0%) and seed weight (32.3 and 34.6%) on main and primary spikes, respectively, compared with the control.”
t0“spring wheat”
Claim · model-written summary
Flowering heat reduced primary-spike seed weight by 34.6%.
- Taxon
- spring wheatTriticum aestivumt0
- Organ / stage
- primary spikese0
- Treatment
- Heat stress for 10 d during floweringe0
- Outcome
- seed weighte0
- Direction
- reductione0
- Value
- 34.6%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress for 10 d during flowering induced significant reduction in seed number (15.4 and 23.0%) and seed weight (32.3 and 34.6%) on main and primary spikes, respectively, compared with the control.”
t0“spring wheat”
Claim · model-written summary
Grain-filling heat reduced main-spike seed weight by 16%.
- Taxon
- spring wheatTriticum aestivumt0
- Organ / stage
- maine0
- Treatment
- Heat stress during grain fillinge0
- Outcome
- seed weighte0
- Value
- 16e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress during grain filling had a more pronounced impact on seed weight (16 and 22%) than seed number (2.7 and 9.3%) in main and primary spikes, respectively.”
t0“spring wheat”
Claim · model-written summary
Grain-filling heat reduced primary-spike seed weight by 22%.
- Taxon
- spring wheatTriticum aestivumt0
- Organ / stage
- primary spikese0
- Treatment
- Heat stress during grain fillinge0
- Outcome
- seed weighte0
- Value
- 22%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress during grain filling had a more pronounced impact on seed weight (16 and 22%) than seed number (2.7 and 9.3%) in main and primary spikes, respectively.”
t0“spring wheat”
Claim · model-written summary
Grain-filling heat reduced main-spike seed number by 2.7%.
- Taxon
- spring wheatTriticum aestivumt0
- Organ / stage
- maine0
- Treatment
- Heat stress during grain fillinge0
- Outcome
- seed numbere0
- Value
- 2.7e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress during grain filling had a more pronounced impact on seed weight (16 and 22%) than seed number (2.7 and 9.3%) in main and primary spikes, respectively.”
t0“spring wheat”
Claim · model-written summary
Grain-filling heat reduced primary-spike seed number by 9.3%.
- Taxon
- spring wheatTriticum aestivumt0
- Organ / stage
- primary spikese0
- Treatment
- Heat stress during grain fillinge0
- Outcome
- seed numbere0
- Value
- 9.3%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat stress during grain filling had a more pronounced impact on seed weight (16 and 22%) than seed number (2.7 and 9.3%) in main and primary spikes, respectively.”
t0“spring wheat”
Claim · model-written summary
KSG025 was identified as a candidate heat-tolerance donor with favourable seed traits, harvest index and pollen germination.
- Taxon
- spring wheatTriticum aestivume0
- Material
- KSG025e0
- Outcome
- candidate donorse0
- Qualifier
- higher seed number, seed weight, and harvest index and appreciable pollen germination under heat stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes KSG025 and KSG1214 with higher seed number, seed weight, and harvest index and appreciable pollen germination under heat stress were identified as candidate donors for simultaneously enhancing flowering and post‐flowering heat tolerance in spring wheat.”
Claim · model-written summary
KSG1214 was identified as a candidate heat-tolerance donor with favourable seed traits, harvest index and pollen germination.
- Taxon
- spring wheatTriticum aestivume0
- Material
- KSG1214e0
- Outcome
- candidate donorse0
- Qualifier
- higher seed number, seed weight, and harvest index and appreciable pollen germination under heat stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes KSG025 and KSG1214 with higher seed number, seed weight, and harvest index and appreciable pollen germination under heat stress were identified as candidate donors for simultaneously enhancing flowering and post‐flowering heat tolerance in spring wheat.”
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