Abstract
Soybean is one of the world's most important sources of vegetable oil. The oil content and fatty acid ratio have attracted significant attention due to their impact on the shelf-life of soybean oil products and the consumers' health. In this study, the high-density genetic map derived from Guizao 1 and Brazil 13 was utilised to analyse the quantitative trait loci of palmitic acid (PA), stearic acid (SA), oleic acid (OA), linoleic acid (LA), linolenic acid (LNA) and oil content. A total of 54 stable QTLs were detected in genetic map linkage analysis, which shared six bin intervals. Among them, the bin interval on chromosome 13 (bin106-bin118 and bin123-bin125) was detected as stable QTLs in multiple environments, linked to OA, LA, and LNA. Eight differentially expressed genes (DEGs) within these QTLs interval were determined as candidate genes according to the joint investigation of parental resequencing, bioinformatics and RNA sequencing data. All these results will be conducive to breeding soybean with the ideal fatty acid ratio for food, and provide the genetic information basis for mining genes related to fatty acid and oil content traits in soybean.
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