Abstract
It is predicted that high-temperature stress will increasingly affect crop yields worldwide as a result of climate change. In order to determine the genetic basis of thermotolerance of seed-set in maize under field conditions, we performed mapping of quantitative trait loci (QTLs) in a recombinant inbred line (RIL) population using a collection of 8329 specifically developed high-density single-nucleotide polymorphism (SNP) markers, combined with a genome-wide association study (GWAS) of 261 diverse maize lines using 259 973 SNPs. In total, four QTLs and 17 genes associated with 42 SNPs related to thermotolerance of seed-set were identified. Among them, four candidate genes were found in both linkage mapping and GWAS. Thermotolerance of seed-set was increased significantly in near-isogenic lines (NILs) that incorporated the four candidate genes in a susceptible parent background. The expression profiles of two of the four genes showed that they were induced by high temperatures in the maize tassel in a tolerant parent background. Our results indicate that thermotolerance of maize seed-set is regulated by multiple genes each of which has minor effects, with calcium signaling playing a central role. The genes identified may be exploited in breeding programs to improve seed-set and yield of maize under heat stress.
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Claims 6
Claim · model-written summary
Linkage mapping and GWAS identified four QTLs and 17 genes associated with 42 SNPs for maize seed-set thermotolerance.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In total, four QTLs and 17 genes associated with 42 SNPs related to thermotolerance of seed-set were identified.”
t0“maize”
Claim · model-written summary
Four candidate genes for maize seed-set thermotolerance were found in both linkage mapping and GWAS.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Among them, four candidate genes were found in both linkage mapping and GWAS.”
t0“maize”
Claim · model-written summary
Near-isogenic maize lines carrying the four candidate genes had significantly increased seed-set thermotolerance in a susceptible parent background.
- Material
- near-isogenic lines (NILs)e0
- Treatment
- incorporated the four candidate genese0
- Outcome
- Thermotolerance of seed-sete0
- Direction
- increasede0
- Comparator
- susceptible parent backgrounde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thermotolerance of seed-set was increased significantly in near-isogenic lines (NILs) that incorporated the four candidate genes in a susceptible parent background.”
t0“maize”
Claim · model-written summary
High temperatures induced expression of two candidate genes in tassels of a tolerant maize parent.
- Material
- tolerant parent backgrounde0
- Organ / stage
- maize tassele0
- Treatment
- high temperaturese0
- Gene
- two of the four genese0
- Outcome
- expression profilese0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The expression profiles of two of the four genes showed that they were induced by high temperatures in the maize tassel in a tolerant parent background.”
t0“maize”
Claim · model-written summary
The authors infer that several minor-effect genes regulate maize seed-set thermotolerance, with calcium signaling central.
- Gene
- multiple genese0
- Outcome
- thermotolerance of maize seed-sete0
- Qualifier
- calcium signaling playing a central rolee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results indicate that thermotolerance of maize seed-set is regulated by multiple genes each of which has minor effects, with calcium signaling playing a central role.”
Claim · model-written summary
The authors propose using the identified genes to improve maize seed-set and yield under heat stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The genes identified may be exploited in breeding programs to improve seed-set and yield of maize under heat stress.”
The same questions in other papers
heat · molecular: expression · Zea mays (maize)Positive and negative results
9 papers in the same direction as this paper · 10 in the opposite direction
- negative
- no effect
- negative
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See all 20 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.