梨自交不亲和基因克隆及其进化分析Cloning and phylogenetic analysis of S-RNase genes in genus Pyrus plants
梁文杰;谭晓风;乌云塔娜;
摘要(Abstract):
【目的】获得梨S-RNase基因全长序列及其进化、遗传多态性情况。【方法】设计特异性引物扩增梨S42-RNase基因组DNA全长序列,利用RT-PCR结合cDNA末端快速扩增(rapid amplification of cDNA ends,RACE)技术获得其cDNA全长序列。构建梨属植物S-RNase基因编码区和高变区(hyper variable region,HV)内含子的系统发育树。【结果】梨S42-RNase基因编码226个氨基酸,包含由27个氨基酸组成的信号肽,由11、11、6、8、7个氨基酸组成的5个保守区以及HV区插入的335 bp内含子序列。系统进化树显示,梨S-RNase基因编码区和HV区内含子的拓扑结构既相似又有差异。编码区Normalized dN-dS结果显示,除了HV区外还有几个区域存在大量的非同义替换,表明对阳性选择具有很高的敏感性。【结论】梨S-RNase基因编码区和HV区内含子的进化存在一定的关联性,除HV区外还存在其他区域参与梨雌蕊与花粉间特异识别。梨S-RNase基因编码区进化动力源自其编码特异识别蛋白的功能,是平衡选择的结果。HV区的内含子序列表现出很高的长度多态性,进化受到负选择的压力。
关键词(KeyWords): 梨;S-RNase;基因克隆;进化分析
基金项目(Foundation): 国家自然科学基金(31000309)
作者(Authors): 梁文杰;谭晓风;乌云塔娜;
DOI: 10.13925/j.cnki.gsxb.20210195
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