Abstract
Abstract Heat stress significantly limits yield in many wheat‐growing areas globally including north‐western NSW. While various traits linked to high‐temperature tolerance have been identified, the combination of traits that optimize the heat tolerance of wheat has not been established in most environments. A total of 554 genotypes were evaluated in the field at different times of sowing in north‐western NSW for three consecutive years to develop a heat‐tolerant wheat ideotype for this environment. The later sown experiments were exposed to higher temperatures at the critical reproductive and grain‐filling stages of development. The impact of high temperature was greatest at anthesis, and eventual grain yield was reduced by between 4% and 7% with every 1°C rise in average maximum temperature above the optimum of 25°C. High temperature reduced yield, plant height, grain weight and days to anthesis and maturity, and increased the percentage of screenings and grain protein content. Genotypes that produced higher yield under heat stress had shorter days to flowering and maturity, higher NDVI during grain filling, greater chlorophyll content at the milk stage of grain fill, taller plants, greater grain weight and number, and lower screenings compared with the benchmark cultivar Suntop. The genotype closest to the predicted heat‐tolerant wheat ideotype identified from trait ranges had 79.6% similarity.
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Claims 8
Claim · model-written summary
Each 1°C rise in maximum temperature above 25°C at anthesis reduced wheat grain yield by 4% to 7%.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- high temperaturee0
- Outcome
- grain yielde0
- Direction
- reducede0
- Value
- between 4% and 7%e0
- Qualifier
- at anthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The impact of high temperature was greatest at anthesis, and eventual grain yield was reduced by between 4% and 7% with every 1°C rise in average maximum temperature above the optimum of 25°C.”
t0“wheat”
Claim · model-written summary
High temperature reduced wheat plant height, grain weight, and days to anthesis and maturity.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- High temperaturee0
- Outcome
- plant height, grain weight and days to anthesis and maturitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High temperature reduced yield, plant height, grain weight and days to anthesis and maturity”
t0“wheat”
Claim · model-written summary
High temperature increased wheat screenings and grain protein content.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- High temperaturee1
- Outcome
- percentage of screenings and grain protein contente0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the percentage of screenings and grain protein content”
e1“High temperature reduced yield, plant height, grain weight and days to anthesis and maturity, and increased the percentage of screenings and grain protein content.”
t0“wheat”
Claim · model-written summary
Higher yielding heat stressed genotypes flowered and matured earlier than Suntop.
- Taxon
- wheatTriticum aestivumt0
- Material
- Genotypese0
- Outcome
- days to flowering and maturitye0
- Direction
- shortere0
- Comparator
- Suntope1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes that produced higher yield under heat stress had shorter days to flowering and maturity”
e1“compared with the benchmark cultivar Suntop”
t0“wheat”
Claim · model-written summary
Higher yielding heat stressed genotypes had greater NDVI during grain filling and chlorophyll at milk stage than Suntop.
- Taxon
- wheatTriticum aestivumt0
- Material
- Genotypese1
- Outcome
- NDVI during grain filling, greater chlorophyll content at the milk stage of grain fille0
- Direction
- highere0
- Comparator
- Suntope2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher NDVI during grain filling, greater chlorophyll content at the milk stage of grain fill”
e1“Genotypes that produced higher yield under heat stress”
e2“compared with the benchmark cultivar Suntop”
t0“wheat”
Claim · model-written summary
Higher yielding heat stressed genotypes were taller and had greater grain weight and number than Suntop.
- Taxon
- wheatTriticum aestivumt0
- Material
- Genotypese1
- Outcome
- grain weight and numbere0
- Direction
- greatere0
- Comparator
- Suntope2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“taller plants, greater grain weight and number”
e1“Genotypes that produced higher yield under heat stress”
e2“compared with the benchmark cultivar Suntop”
t0“wheat”
Claim · model-written summary
Higher yielding heat stressed genotypes had lower screenings than Suntop.
- Taxon
- wheatTriticum aestivumt0
- Material
- Genotypese1
- Outcome
- screeningse0
- Direction
- lowere0
- Comparator
- Suntope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower screenings compared with the benchmark cultivar Suntop”
e1“Genotypes that produced higher yield under heat stress”
t0“wheat”
Claim · model-written summary
The closest genotype to the predicted heat tolerant ideotype had 79.6% similarity.
- Taxon
- wheatTriticum aestivume0
- Material
- genotypee0
- Outcome
- similaritye0
- Value
- 79.6%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The genotype closest to the predicted heat‐tolerant wheat ideotype identified from trait ranges had 79.6% similarity.”
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See all 309 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.