期刊
PLANT BREEDING
卷 138, 期 6, 页码 708-720出版社
WILEY
DOI: 10.1111/pbr.12734
关键词
climate-controlled conditions; cold stress tolerance; genomic prediction; quantitative trait loci; resource allocation; soybean
资金
- Bundesministerium fur Ernahrung und Landwirtschaft [2814EPS011]
- German Federal Ministry of Food and Agriculture
Breeding soybeans for higher latitudes requires cultivars with an increased chilling stress tolerance, especially when flowering occurs. Phenotyping in climate chambers to select for this trait is labour-intensive and requires an optimal allocation of resources due to limited space. We screened a diversity panel of 35 early maturity cultivars and a biparental population of 103 RILs for their cold stress tolerance at flowering stage. Pod number under control and stress conditions is highly heritable and showed only a weak correlation between the two treatments. Based on different testing scenarios, we could show that testing more genotypes with less replicates yields much higher responses to selection and hence should be pursued in such climate-controlled experiments. We identified quantitative trait loci (QTL) for pod number under both conditions (chromosomes 7 and 13) and a cold tolerance-specific QTL (chromosome 11). Furthermore, we performed genomic predictions using different test set scenarios and prediction models, showing that genomic prediction is a promising tool to select for cold stress tolerance, particularly if known QTL can be used as fixed effects in the model.
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