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New insights into the genetic networks affecting seed fatty acid concentrations in Brassica napus

文献类型： 外文期刊

作者： Wang, Xiaodong 1 ; Long, Yan 2 ; Yin, Yongtai 1 ; Zhang, Chunyu 2 ; Gan, Lu 1 ; Liu, Liezhao 5 ; Yu, Longjiang 1 ; Meng, 1 ;

作者机构： 1.Huazhong Univ Sci & Technol, Coll Life Sci & Technol, Wuhan 430074, Peoples R China

2.Huazhong Agr Univ, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Peoples R China

3.Chinese Acad Agr Sci, Inst Biotechnol, Beijing 100081, Peoples R China

4.Jiangsu Acad Agr Sci, Inst Ind Crops, Key Lab Cotton & Rapeseed, Minist Agr, Nanjing 210014, Jiangsu, Peoples R China

5.Southwest Univ, Coll Agron & Biotechnol, Chongqing 400716, Peoples R China

关键词： Brassica napus;Fatty acid composition;QTL;Epistatic interaction;Regulatory pathway

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）

ISSN： 1471-2229

年卷期： 2015 年 15 卷

页码：

收录情况： SCI

摘要： Background: Rapeseed (B. napus, AACC, 2n = 38) is one of the most important oil seed crops in the world, it is also one of the most common oil for production of biodiesel. Its oil is a mixture of various fatty acids and dissection of the genetic network for fatty acids biosynthesis is of great importance for improving seed quality. Results: The genetic basis of fatty acid biosynthesis in B. napus was investigated via quantitative trail locus (QTL) analysis using a doubled haploid (DH) population with 202 lines. A total of 72 individual QTLs and a large number pairs of epistatic interactions associated with the content of 10 different fatty acids were detected. A total of 234 homologous genes of Arabidopsis thaliana that are involved in fatty acid metabolism were found within the confidence intervals (CIs) of 47 QTLs. Among them, 47 and 15 genes homologous to those of B. rapa and B. oleracea were detected, respectively. After the QTL mapping, the epistatic and the candidate gene interaction analysis, a potential regulatory pathway controlling fatty acid biosynthesis in B. napus was constructed, including 50 enzymes encoded genes and five regulatory factors (LEC1, LEC2, FUS3, WRI1 and ABI3). Subsequently, the interaction between these five regulatory factors and the genes involved in fatty acid metabolism were analyzed. Conclusions: In this study, a potential regulatory pathway controlling the fatty acid was constructed by QTL analysis and in silico mapping analysis. These results enriched our knowledge of QTLs for fatty acids metabolism and provided a new clue for genetic engineering fatty acids composition in B. napus.

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