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青海省东部地区小麦条锈菌群体遗传结构分析
Population genetic structure of wheat stripe rust pathogen Puccinia striiformis f.sp.tritici in eastern Qinghai Province

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周聪颖 1   吕璇 1   邓杰 1   赵宝强 1   高图强 1   姚强 2   马占鸿 1 *  
文摘 小麦条锈病是由条形柄锈菌小麦专化型[Puccinia striiformis f.sp.tritici (Pst)]引起的大区流行性病害,严重影响我国小麦生产和粮食安全。青海省是全国小麦条锈病的常发流行区和条锈菌西北越夏区的重要组成部分,青海省东部农业区为该省小麦主要种植区,明确该区小麦条锈菌群体遗传结构,有助于掌握地区内部的菌源来源和菌群关系,为小麦条锈病的防控提供科学依据。利用13对SSR引物对青海东部9县区185个小麦条锈菌菌系进行了群体遗传结构分析。结果表明:青海东部麦区各县区亚群体遗传变异主要来源于亚群体内部个体,青海省东部地区湟水流域的互助县亚群体具有最高基因多样性,同属于湟水流域的化隆县亚群体具有最高基因型多样性,推测互助县和化隆县可能为青海东部小麦条锈群体遗传多样性中心。遗传分化Fst值表明青海省小麦条锈菌群体遗传分化差异较大。贝叶斯聚类、主成分判别分析(DAPC)、主坐标分析(PCoA)、系统发育聚类结果反映出青海省东部地区存在3个群体分组。共享基因型分布在化隆县、互助县、大通县和湟中区四个地区的亚群体间,表明它们之间存在密切的菌源交流;大量独享基因型的发现,暗示青海东部地区存在相对独立的遗传群体。连锁不平衡分析结果显示,尖扎县亚群体检测到有性生殖信号,其余各采样县市亚群体上未检测到有性生殖信号,整体上青海省东部地区的小麦条锈菌群体表现出有性生殖与无性生殖的混合生殖特征。综上,充分证实了青海东部流行区的条锈菌群体既存在远距离传播,又具有相对独立的特征,是我国小麦条锈菌重要的越夏和变异基地。
其他语种文摘 Wheat stripe rust caused by Puccinia striiformis f.sp.tritici (Pst),is an epidemic disease which seriously affects wheat production and food security in China.Qinghai Province is a frequent epidemic region and an important part of the northwest over-summering region of wheat stripe rust in China.The eastern agricultural region is the main wheat production region in Qinghai Province.Understanding the population genetic structure of Pst in this region is helpful to elucidate the origin and relationship of wheat stripe rust and provide scientific basis for the control of wheat stripe rust.The population genetic structure of 185 Pst isolates in 9 Counties (Districts) of eastern Qinghai Province were analyzed using 13 pairs of SSR primers.The results showed that the genetic variation mainly comes from individuals within the subpopulations.Huzhu County subpopulation had the highest genetic diversity,and Hualong County subpopulation had the highest genotype diversity.It was speculated that Huzhu County and Hualong County might be the genetic diversity center of Pst population in eastern Qinghai Province.The Fst value showed that the genetic differentiation of Pst populations in eastern Qinghai Province was distinct.Bayesian clustering,DAPC,PCoA and phylogenetic clustering reflected that there were three population groups.The shared genotypes were distributed among the subpopulations in Hualong County,Huzhu County,Datong County and Huangzhong District,indicating that there was close Pst inoculum exchange among them;The discovery of a large number of exclusive genotypes suggested that there were relatively independent genetic populations.The results of linkage disequilibrium analysis showed that sexual reproduction signals were detected in the subpopulation of Jianzha County,and no sexual reproduction signals were detected in the subpopulation of other Counties (Districts).On the whole,the Pst population in the eastern Qinghai Province showed mixed reproductive characteristics of both sexual and asexual reproduction.In conclusion,it was confirmed that the Pst population in eastern Qinghai Province has both long-distance transmission and relatively independent characteristics,and is an important over-summering and variation base of Pst in China.
来源 植物病理学报 ,2023,53(5):922-933 【核心库】
DOI 10.13926/j.cnki.apps.000841
关键词 小麦条锈菌 ; SSR ; 群体遗传学 ; 青海省 ; 小麦条锈病
地址

1. 中国农业大学植物病理学系, 农业农村部作物有害生物监测与绿色防控重点实验室, 北京, 100193  

2. 青海省农林科学院, 青海省农业有害生物综合治理重点实验室, 西宁, 810016

语种 中文
文献类型 研究性论文
ISSN 0412-0914
学科 植物保护
基金 国家重点研发计划项目
文献收藏号 CSCD:7616497

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1 郭阳 208份春小麦资源抗条锈性评价及抗病基因检测 麦类作物学报,2025,45(4):448-461
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