Abstract
High yield and wide adaptation are principal targets of wheat breeding but are hindered by limited knowledge on genetic basis of agronomic traits and abiotic stress tolerances. In this study, 277 wheat accessions were phenotyped across 30 environments with non-stress, drought-stressed, heat-stressed, and drought-heat-stressed treatments and were subjected to genome-wide association study using 395 681 single nucleotide polymorphisms. We detected 295 associated loci including consistent loci for agronomic traits across different treatments and eurytopic loci for multiple abiotic stress tolerances. A total of 22 loci overlapped with quantitative trait loci identified by biparental quantitative trait loci mapping. Six loci were simultaneously associated with agronomic traits and abiotic stress tolerance, four of which fell within selective sweep regions. Selection in Chinese wheat has increased the frequency of superior marker alleles controlling yield-related traits in the four loci during past decades, which conversely diminished favourable genetic variation controlling abiotic stress tolerance in the same loci; two promising candidate paralogous genes colocalized with such loci, thereby providing potential targets for studying the molecular mechanism of stress tolerance-productivity trade-off. These results uncovering promising alleles controlling agronomic traits and/or multiple abiotic stress tolerances, providing insights into heritable covariation between yield and abiotic stress tolerance, will accelerate future efforts for wheat improvement.
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Claims 7
Claim · model-written summary
The association study detected 295 loci, including consistent agronomic and multi-stress loci.
Verbatim
e0“We detected 295 associated loci including consistent loci for agronomic traits across different treatments and eurytopic loci for multiple abiotic stress tolerances.”
Claim · model-written summary
Twenty-two loci overlapped biparental QTL.
- Taxon
- wheat
Triticum aestivumt0 - Outcome
- loci overlapped with quantitative trait locie0
- Value
- 22 locie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A total of 22 loci overlapped with quantitative trait loci identified by biparental quantitative trait loci mapping.”
t0“wheat”
Claim · model-written summary
Six loci were associated with both agronomic traits and abiotic stress tolerance.
- Taxon
- wheatTriticum aestivumt0
- Gene
- locie0
- Outcome
- agronomic traits and abiotic stress tolerancee0
- Value
- Six locie0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Six loci were simultaneously associated with agronomic traits and abiotic stress tolerance, four of which fell within selective sweep regions.”
t0“wheat”
Claim · model-written summary
Four of the six shared loci lay in selective sweep regions.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- fell within selective sweep regionse0
- Value
- foure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“four of which fell within selective sweep regions.”
t0“wheat”
Claim · model-written summary
Selection raised superior yield allele frequencies at four loci.
Verbatim
e0“Selection in Chinese wheat has increased the frequency of superior marker alleles controlling yield-related traits in the four loci during past decades”
Claim · model-written summary
Selection diminished favorable abiotic stress variation at the same loci.
- Taxon
- wheatTriticum aestivumt0
- Gene
- locie0
- Outcome
- favourable genetic variation controlling abiotic stress tolerancee0
- Direction
- diminishede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which conversely diminished favourable genetic variation controlling abiotic stress tolerance in the same loci”
t0“wheat”
Claim · model-written summary
Two candidate paralogous genes colocalized with the loci.
- Taxon
- wheatTriticum aestivumt0
- Gene
- candidate paralogous genese0
- Outcome
- colocalized with such locie0
- Value
- twoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two promising candidate paralogous genes colocalized with such loci”
t0“wheat”