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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (6): 1042-1051.doi: 10.19802/j.issn.1007-9084.2021107

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Quantitative trait locus analysis for sesame oil and fatty acid contents

Rong ZHOU(), Fang-tao XU, Chen SHENG, Jun YOU, Dong-hua LI, Sheng-nan SONG, Lin-hai WANG   

  1. Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences /Key Laboratory of Biology and Genetic Improvement of Oil Crops, Ministry of Agriculture and Rural Affairs, Wuhan 430062, China
  • Received:2021-04-02 Online:2021-12-22 Published:2021-12-23
  • Contact: Lin-hai WANG E-mail:rongzzzzzz@126.com

Abstract:

In this study, the oil content, oleic acid, linoleic acid, palmitic acid and stearic acid content variations of the RIL population, that generated from the high oil content sesame cultivar "Zhongzhi 13" (56.31%) and the low oil content sesame material ZZM2748 (48.75%) with 548 lines, were studied in two different environments by near infrared method, and the QTL were mapped using the two softwares WinQTLCart2.5 and ICIMapping3.0 based on a genetic linkage map. It was found that the oil content and fatty acid content of the population had great variation. The RIL oil contents varied from 42.43% to 58.38% in different environments, and it had no significant correlation with oleic acid and linoleic acid content but palmitic acid content. A total of 50 QTLs were mapped and distributed in 11 linkage groups of sesame, with the contribution rate varying from 1.59% to 40.62%. Among them, 21 QTLs were detected by the two software parallelly, and 7 QTL were repeatedly detected in the two environment. The two QTL qSOC_10.3 and qSOC_11.1contributed 34.38% and 40.62% to the phenotype variations respectively, and were the major loci for the oil content variation. Especially, qSOC_11.1 also exhibited pleiotropic for oleic acid, linoleic acid, palmitic acid and stearic acid. In combination with gene annotation and differential expression analysis, 24 candidate genes were found at the two major loci. The genetic variation characteristics of sesame oil content and different fatty acid content, QTL and candidate genes obtained in this study have guiding significance and application value for genetic improvement of related traits.

Key words: sesame, oil content, oleic acid, linoleic acid, QTL

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