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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2020, Vol. 42 ›› Issue (5): 796-.doi: 10.19802/j.issn.1007-9084.2019265

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QTL mapping of fatty acids in different F2 populations in soybean

  

  1. School of Agriculture, Yunnan University, Kunming 650091, China
  • Online:2020-10-28 Published:2020-09-17

Abstract: Soybean is one of the most important oil crops in China and around the world. Soybean oil contains
mainly five fatty acids, and the relative composition of saturated and unsaturated fatty acids determines the quality
and use of soybean oil. In this study, a low linolenic line, FA10, was used as a common male parent to cross with
Zhongdou 32 and Zhongdou 43 to construct two F2 segregating populations. Gas Chromatography (GC) method was
used to determine the concentrations of fatty acids and SSR markers were used to analyze the genotype for the individuals
in the two populations. The objective of this study was to identify repeatable QTLs associated with fatty acids
in different genetic backgrounds in soybean. Using Interval Mapping (IM) method, a total of 39 and 18 QTLs for
fatty acids were detected in the two populations, respectively. Compared with the QTLs reported in previous studies,
40 QTLs showed same or close markers or marker intervals. Comparing the results from the two populations in this
study, four pairs of QTLs for linolenic showed high consistency in marker intervals and confirmed the results in previous
studies. All these stable QTLs for fatty acids might provide useful information for the improvement of fatty acids
in soybean.

Key words: soybean, fatty acids, genetic background, QTL mapping

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