Abstract
SUMMARY Climatic change affects global agriculture and is a severe threat to global food security due to variability of the three factors measuring climate change (CO 2 , temperature and precipitation) with temperature being the most crucial one. Wheat is severely affected by high temperatures with reproductive and grain-filling phases being most sensitive, impacting grain number, size and weight. Seed size and weight are the key agronomic traits subjected to artificial selection and involved in the domestication process since the origin of agriculture. Three genotypes Banks, EGA Gregory and Fang-60 with the latter known to be heat tolerant were grown under glass house conditions and subjected to heat stress for 3 days during early- (11–14 dpa – days post anthesis) and late- (27–30 dpa) grain filling stages in a mutually exclusive fashion. The impact of heat stress during early- and late- grain filling on the four major grain characteristics, thousand grain weight (TGW), grain length, grain width and grain thickness was assessed. The tolerant genotype Fang-60 exhibited significantly higher TGW during early-grain filling heat stress than the control possibly due to an ability to exploit the accelerated release of fertilizer under high temperature. Banks and EGA Gregory were moderately tolerant to susceptible to heat stress, respectively, at early- and late-grain filling with Fang-60 being tolerant to both early- and late- grain filling heat stress. This study confirms the availability of significant genetic variation in heat stress response in wheat that might be exploited to adapt wheat to higher growth temperatures.
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Claims 5
Claim · model-written summary
Fang-60 had significantly higher thousand grain weight under early grain filling heat stress than control.
- Taxon
- Wheat
Triticum aestivume1 - Material
- Fang-60e0
- Treatment
- early-grain filling heat stresse0
- Outcome
- TGWe0
- Direction
- highere0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tolerant genotype Fang-60 exhibited significantly higher TGW during early-grain filling heat stress than the control”
e1“Wheat is severely affected”
Claim · model-written summary
Banks was moderately tolerant to heat stress during grain filling.
- Taxon
- WheatTriticum aestivume1
- Material
- Bankse0
- Outcome
- moderately tolerante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Banks and EGA Gregory were moderately tolerant to susceptible to heat stress, respectively, at early- and late-grain filling”
e1“Wheat is severely affected”
Claim · model-written summary
EGA Gregory was susceptible to heat stress during grain filling.
- Taxon
- WheatTriticum aestivume1
- Material
- EGA Gregorye0
- Outcome
- susceptible to heat stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Banks and EGA Gregory were moderately tolerant to susceptible to heat stress, respectively, at early- and late-grain filling”
e1“Wheat is severely affected”
Claim · model-written summary
Fang-60 was tolerant to both early and late grain filling heat stress.
- Taxon
- WheatTriticum aestivume1
- Material
- Fang-60e0
- Outcome
- tolerant to both early- and late- grain filling heat stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fang-60 being tolerant to both early- and late- grain filling heat stress”
e1“Wheat is severely affected”
Claim · model-written summary
The authors found significant genetic variation in wheat heat stress response.
- Taxon
- wheatTriticum aestivume0
- Outcome
- genetic variation in heat stress responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant genetic variation in heat stress response in wheat”
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