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The genetic diversity of group-1 homoeologs and characterization of novel LMW-GS genes from Chinese Xinjiang winter wheat landraces (Triticum aestivumL.)

文献类型： 外文期刊

作者： Hu, Xinkun 1 ; Dai, Shoufen 1 ; Yan, Yongliang 3 ; Liu, Yaxi 1 ; Zhang, Jinbo 3 ; Lu, Zifeng 3 ; Wei, Yuming 1 ; Zheng, Y 1 ;

作者机构： 1.Sichuan Agr Univ, State Key Lab Crop Gene Explorat & Utilizat South, Chengdu 611130, Sichuan, Peoples R China

2.Sichuan Agr Univ, Triticeae Res Inst, Chengdu 611130, Sichuan, Peoples R China

3.Xinjiang Acad Agr Sci, Inst Crop Germplasm Resource, Urumqi 830091, Peoples R China

关键词： Chinese endemic wheats; Xinjiang wheat landraces; Low-molecular-weight glutenins (LMW-GSs); Chimeric genes; Evolutionary relationships

期刊名称：JOURNAL OF APPLIED GENETICS （ 影响因子：3.24； 五年影响因子：2.756 ）

ISSN： 1234-1983

年卷期： 2020 年 61 卷 3 期

页码：

收录情况： SCI

摘要： Group-1 homoelog genes in wheat genomes encode storage proteins and are the major determinants of wheat product properties. Consequently, understanding the genetic diversity of group-1 homoelogs and genes encoding storage proteins, especially the low-molecular-weight glutenins (LMW-GSs), within wheat landrace genomes is necessary to further improve the quality of modern wheat crops. The genetic diversity of group-1 homoelogs in 75 Xinjiang winter wheat landraces was evaluated by Diversity Arrays Technology (DArT) markers. These data were used to select 15 landraces for additional LMW-GS gene isolation. The genetic similarity coefficients among landraces were highly similar regardless if considering the diversity markers on 1A, 1B, and 1D chromosomes individually or using all of the markers together. These similarities were evinced by the generation of four similar cluster dendrograms that comprised 11-15 landrace groups, regardless of the dataset used to generate the dendrograms. A total of 105 LMW-GS sequences corresponding to 79 unique genes were identified overall by using primers designed to targetGlu-A3andGlu-B3loci, and 54 mature proteins were predicted from the unique LMW-GS genes. Nine novel chimeric LMW-GS genes were also identified, of which, one was recombinant for -i/-m, one for -s/-m, and seven for -m/-m parent genes, respectively. Phylogenetic analysis separated all of the LMW-GSs into three clades that were supported by moderate bootstrap values (> 70%). The clades corresponded to LMW-GS genes primarily harboring different N-terminals. These results provide useful information for better understanding the evolutionary genetics of the importantGlu-3locus of wheat, and they also provide new novel gene targets that can potentially be exploited to improve wheat quality.

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