Molecular phylogeny and dynamic evolution of disease resistance genes in the legume family

文献类型： 外文期刊

第一作者： Zheng, Fengya

作者： Zheng, Fengya;Wong, Fuk-Ling;Zhao, Shancen;Lam, Hon-Ming;Zheng, Fengya;Wong, Fuk-Ling;Zhao, Shancen;Lam, Hon-Ming;Wu, Haiyang;Li, Shiming;He, Weiming;Zhao, Shancen;Wu, Haiyang;Wu, Haiyang;Zhang, Rongzhi;Li, Genying

作者机构：

关键词： R-genes;Legumes;Evolution;Coiled-coil (CC) domain;Toll/Interleukin-1 receptor (TIR) domain;Nucleotide-binding site (NBS);Leucine-rich repeat (LRR) domain

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： 2016 年 17 卷

页码：

收录情况： SCI

摘要： Background: Legumes are the second-most important crop family in agriculture for its economic and nutritional values. Disease resistance (R-) genes play an important role in responding to pathogen infections in plants. To further increase the yield of legume crops, we need a comprehensive understanding of the evolution of R-genes in the legume family. Results: In this study, we developed a robust pipeline and identified a total of 4,217 R-genes in the genomes of seven sequenced legume species. A dramatic diversity of R-genes with structural variances indicated a rapid birth-and-death rate during the R-gene evolution in legumes. The number of R-genes transiently expanded and then quickly contracted after whole-genome duplications, which meant that R-genes were sensitive to subsequent diploidization. R proteins with the Coiled-coil (CC) domain are more conserved than others in legumes. Meanwhile, other types of legume R proteins with only one or two typical domains were subjected to higher rates of loss during evolution. Although R-genes evolved quickly in legumes, they tended to undergo purifying selection instead of positive selection during evolution. In addition, domestication events in some legume species preferentially selected for the genes directly involved in the plant-pathogen interaction pathway while suppressing those R-genes with low occurrence rates. Conclusions: Our results provide insights into the dynamic evolution of R-genes in the legume family, which will be valuable for facilitating genetic improvements in the disease resistance of legume cultivars.

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