念珠藻属植物hetR基因的适应性进化分析  

Adaptive evolutionary analysis of hetR gene in Nostoc

作　　者：王捷[1] 魏爱丽[1] 石瑛[1] 李艳晖[1] 韩雨昕 王中杰 Wang Jie;Wei Ai-Li;Shi Ying;Li Yan-Hui;Han Yu-Xin;Wang Zhong-Jie(Department of Biology,Taiyuan Normal University,Jinzhong,Shanxi 030619,China;School of Life Science,Shanxi University,Taiyuan 030006,China;Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture,Wuhan Botanical Garden,Chinese Academy of Sciences,Wuhan 430074,China)

机构地区：[1]太原师范学院生物系,山西晋中030619 [2]山西大学生命科学学院,太原030006 [3]中国科学院武汉植物园,中国科学院植物种质创新与特色农业重点实验室,武汉430074

出　　处：《植物科学学报》2020年第1期23-31,共9页Plant Science Journal

基　　金：国家自然科学基金项目(51709197);山西省“1331工程”重点创新团队建设计划(TD201718);山西省应用基础研究计划(201801D221282);山西省高等学校科技创新项目(201802102)。

摘　　要：以念珠藻属(Nostoc)及其近缘类群hetR基因的51条序列为研究对象,对hetR基因的编码蛋白进行生物信息学分析和系统发育分析,并使用分支模型、位点模型和分支-位点模型进行该基因位点的适应性进化研究。系统发育分析结果显示,51条hetR基因蛋白序列可分为4个大分支。适应性进化分析结果表明,在3种进化模型中,大多数分支及藻株都没有检测到统计学上具有显著性的正选择位点,说明检测的位点大多处于负选择压力下。但在普通念珠藻(Nostoc commune,CHAB2802)中检测到正选择位点(126T),提示念珠藻属植物hetR基因发生了适应性改变。Fifty-one sequences of the hetR gene from Nostoc and related species of cyanobacteria were studied.The coding proteins of hetR were analyzed by bioinformatics and phylogenetic analysis.The adaptive evolutionary characteristics of hetR were studied using the branch,site,and branch-site models.Phylogenetic analysis showed that the inner group could be divided into four large branches.Based on the adapti ve evolutionary analysis,no significant positive selection sites were detected in other branches and algae strains of the three evolutionary models,indicating that most of the sites were under negative selection pressure.However,significant positively selected sites(126T)were detected in Nostoc commune(CHAB2802),indicating that the hetR gene has undergone adaptive evolution in Nostoc.

关 键 词：念珠藻属 hetR基因 适应性进化 

分 类 号：Q949.2[生物学—植物学]