Genetic diversity of NBS-LRR class disease-resistance gene analogs in cultivated and wild eggplants
文献类型: 外文期刊
作者: Zhuang, Yong 1 ; Zhou, Xiaohui 1 ; Wang, Shubin 1 ;
作者机构: 1.Jiangsu Acad Agr Sci, Inst Vegetable Crops, Nanjing 210014, Peoples R China
关键词: Eggplant;Disease-resistance gene;NBS-LRR;Genetic diversity;Resistance gene analogs
期刊名称:PLANT SYSTEMATICS AND EVOLUTION ( 影响因子:1.631; 五年影响因子:1.704 )
ISSN: 0378-2697
年卷期: 2012 年 298 卷 7 期
页码:
收录情况: SCI
摘要: The genes encoding the nucleotide-binding site (NBS) and leucine-rich repeat (LRR) motifs constitute a large gene family in plants and have attracted much interest, because most of the plant disease-resistance genes that have been cloned are from this gene family. In this study, degenerate oligonucleotide primers, designed on the basis of conserved regions of the NBS domains from known plant resistance genes, were used to isolate resistance gene analogs (RGAs) from cultivated and wild eggplants, i.e., S. melongena, S. aethiopicum gr. Gilo, S. linnaeanum, S. integrifolium, S. sisymbriifolium, and S. khasianum. Sequence analysis indicated that the cloned eggplant RGAs belong to the non-TIR-NBS-LRR type, which are very similar to the R genes or the RGAs identified in other plant species, especially Solanaceae plants, suggesting the existence of common ancestors. Wide genetic diversity of eggplant RGAs was observed both in interspecific and intraspecific sequences, and eight distinct families of eggplant RGAs were identified. Further studies revealed a high average ratio of synonymous to non-synonymous substitution and a low level of recombination. These results suggest that NBS-encoding sequences of RGAs in cultivated and wild eggplants are subject to gradual accumulation of mutations leading to purifying selection. This is the first report of NBS-LRR class RGAs in eggplants.
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