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High genetic abundance of Rpi-blb2/Mi-1.2/Cami gene family in Solanaceae

文献类型： 外文期刊

作者： Zhao, Lina 1 ; Zhang, Qijun 2 ; Gao, Rongchao 1 ; Yang, Sihai 1 ; Liu, Haoxuan 1 ; Zhang, Xiaohui 1 ;

作者机构： 1.Nanjing Univ, State Key Lab Pharmaceut Biotechnol, Sch Life Sci, Nanjing 210000, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Nanjing 210000, Jiangsu, Peoples R China

关键词： Plant R gene;Rpi-blb2/Mi-1.2/Cami;Evolutionary history

期刊名称：BMC EVOLUTIONARY BIOLOGY （ 影响因子：3.26； 五年影响因子：3.732 ）

ISSN： 1471-2148

年卷期： 2015 年 15 卷

页码：

收录情况： SCI

摘要： Background: Three NBS-LRR genes, Rpi-blb2, Mi-1.2, and Cami, constitute a very special plant resistance gene family. These genes confer resistance against 4 distantly related pathogen species in 3 different Solanaceae hosts. To characterize this noted resistance, we conducted a series of studies on this gene family. Results: First, homologs of this gene family were identified in the pepper, tomato and potato genomes. This revealed a large variation in copy number within this gene family among species and a great divergence was found both between and within species. To gain more information pertaining to gene resistance within this family, 121 LRR regions were cloned in 16 different wild/cultivated potato accessions. Again, frequent copy number variations and a high level of divergence between homolog were observed common among accessions. The divergence within species was so high that it reaches the level of divergence between species. Also, frequent frameshift mutations and abundant gene conversion events were identified in these LRR regions. Conclusions: Our findings suggest that this family harbors an unusually high level of genetic abundance, making it of particular interest. Together with other reported examples, our study also provides evidence that multi-resistance is a common trait in R gene families like this.

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