Abstract
Pod number is an important component of yield in soybean (Glycine max (L.) Merr.), and pods are unevenly distributed in the upper, middle and lower parts of the plant. Here, linkage analysis combined with genome-wide association study (GWAS) was used to identify 20 pod number-related traits in four-way recombinant inbred lines (FW-RILs) derived from crosses between the four soybean varieties (Kenfeng 14 × Kenfeng 15) × (Heinong 48 × Kenfeng 19). The results show that pod number-related traits are highly influenced by genetic factors, while the environment plays only a minor role. A total of 602 QTLs were identified, of which 52 were detected in multiple environments (over two environments). In addition, GWAS detected 26 common QTNs (identified by multiple methods or environments) in the QTL intervals. Based on gene ontology (GO) enrichment analysis and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis, 11 potential candidate genes were identified that likely involved the growth and development of soybean pods. These findings will help elucidate the genetic basis of pod number traits.
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The authors gratefully acknowledge the financial support for this study provided by grants from the National Key Research and Development Program of China (2017YFD0101303-6) to W-X.L.
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W-XL and HN conceived and designed the experiments. XS, JW, CY, SJ, MS, XL ZQ, YW, XT, and YF performed the field experiments. SL and ZT performed the genome sequencing. JS, KZ, and HN analyzed and interpreted the results. JS and HN drafted the manuscript and all the authors contributed to the manuscript revision.
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Table S1
Summary of planting conditions of 5 environments (XLSX 9 kb)
Table S2
Phenotypic data of pod number traits in 6 extreme lines (XLSX 8 kb)
Table S3
Primer sequences used in this study (XLSX 9 kb)
Table S4
Statistical analysis of pod number-related traits for FW-RILs grown in different environments (XLSX 18 kb)
Table S5
Joint ANOVA of pod numbers related traits of FW-RILs in multiple environments and heritability (XLSX 16 kb)
Table S6
Identification of QTL for soybean pod number at Multi-environment (XLSX 16 kb)
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Song, J., Sun, X., Zhang, K. et al. Identification of QTL and genes for pod number in soybean by linkage analysis and genome-wide association studies. Mol Breeding 40, 60 (2020). https://doi.org/10.1007/s11032-020-01140-w
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DOI: https://doi.org/10.1007/s11032-020-01140-w