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Genomic variations and association study of agronomic traits in flax

文献类型： 外文期刊

作者： Xie, Dongwei 1 ; Dai, Zhigang 1 ; Yang, Zemao 1 ; Tang, Qing 1 ; Sun, Jian 3 ; Yang, Xue 4 ; Song, Xixia 2 ; Lu, Ying 2 ; Zh 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Bast Fiber Crops, Changsha, Hunan, Peoples R China

2.Heilongjiang Acad Agr Sci, Inst Ind Crops, Harbin, Heilongjiang, Peoples R China

3.Northeast Agr Univ, Agr Coll, Harbin, Heilongjiang, Peoples R China

4.Heilongjiang Acad Agr Sci, Sino Russian Agr Sci & Technol Cooperat Ctr, Harbin, Heilongjiang, Peoples R China

关键词： Flax; SLAF-seq; Genetic diversity; Evolution; GWAS

期刊名称：BMC GENOMICS （ 影响因子：3.969； 五年影响因子：4.478 ）

ISSN： 1471-2164

年卷期： 2018 年 19 卷

页码：

收录情况： SCI

摘要： Background: Flax (Linum usitatissimum. L) is an ancient oilseed and natural fiber crop. It could be divided into three categories by use, namely oil flax, fiber flax and oil-fiber dual purpose (OF). Cultivated flax is widely used in the food and textile industry. It is of great significance to elucidate the genetic characteristics of flax collections for accelerating the process of breeding improvement in this dual purpose crop. With the development of next-generation sequencing, we can use new methods, such as SLAF-seq (specific-locus amplified fragment sequencing), to decode unknown genomes of species. In this study, a high-through sequencing of flax collections using SLAF-seq was conducted. The evolutionary tendency was defined and candidate genes associated with agronomic traits of flax species were identified by Genome-Wide Association Studying (GWAS). Results: A flax collection consisting of 224 varieties were sequenced by SLAF-seq. In total, 346,639 SLAF tags were developed from all accessions, with an average sequencing depth of 7.19 for each accession. A total of 584,987 SNPs (single nucleotide polymorphism) with an MAF > 0.05 were identified from these SLAFs. The population structure division and phylogenetic analysis indicated a strong divergence among three kinds of flax groups. The genome-wide variation uncovered that oil flax had the highest genetic diversity and was considered to be the ancestor of fiber flax and oil-fiber flax. Sixteen associated peak SNPs for six traits were obtained by GWAS of oilrelated traits using EMMAX (efficient mixed-model association eXpedited). Candidate genes and their related pathway were evaluated. A new GWAS was developed for fiber properties using the GLM (General linear model) model and a number of loci were identified. Conclusions: To our knowledge, this is the first study on discovery multiple loci for important agronomic traits of flax species using GWAS strategy. These results will provide the highest possibility of incorporating both high fiber and good oil traits in a single variety.

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