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中国生物防治学报 ›› 2016, Vol. 32 ›› Issue (1): 55-61.DOI: 10.16409/j.cnki.2095-039x.2016.01.009

• 研究论文 • 上一篇    下一篇

家蚕灰僵病种群遗传结构研究

张胜利1,2, 陈雪2, 蒲顺昌1, 徐延平2, 何灵敏2, 李增智2, 栾丰刚3   

  1. 1. 亳州师范高等专科学校生物工程研究所, 亳州 236800;
    2. 安徽农业大学微生物防治省重点实验室, 合肥 230036;
    3. 江西农业大学林学院, 南昌 330045
  • 收稿日期:2015-03-23 出版日期:2016-02-08 发布日期:2016-02-22
  • 通讯作者: 栾丰刚
  • 作者简介:张胜利(1984-),男,工程师,E-mail:victory.z@163.com
  • 基金资助:
    安徽省高校自然科学基金(KJ2013B152);金蝉花产品开发创新研究团队(校教字[2014]60);江西省科技计划项目(20132BAB204024)

Population Genetic Structure Analysis of Insect Fungal Pathogen Causing Silkworm Grey Muscardine

ZHANG ShengLi1,2, CHEN Xue2, PU Shunchang1, XU Yanping2, HE Lingmin2, LI Zengzhi2, LUAN Fenggang3   

  1. 1. Institute of Biological Engineering, Bozhou Teachers College, Bozhou 236800, China;
    2. Provincial Key Laboratory of Microbial Control, Anhui Agricultural University, Hefei 230036, China;
    3. College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China
  • Received:2015-03-23 Online:2016-02-08 Published:2016-02-22

摘要: 家蚕灰僵病为低频率发生的家蚕真菌性地方病,病原为爪哇棒束孢。采用ISSR分子标记对安徽潜山和浙江桐乡的2个家蚕灰僵病病原种群进行了指纹图谱分析。利用12个ISSR引物共扩增出132个位点,其中多态位点数为93个,占70.45%。在种群水平上的Nei's遗传多样性指数(h)和Shannon's指数(Is)具有一致性。采用UPGMA法进行聚类分析,来自2个地区的19个菌株在遗传相似系数0.76处完全按地理来源分为2个类群;基于ISSR信息的三维主坐标分析(PCA)结果与分子聚类结果一致。2个家蚕灰僵病病原种群间的基因流(Nm)为0.5106,遗传分化系数(Gst)为0.3287,说明种群间遗传多样性高于种群内。2个种群单独聚类表明,潜山地方病种群在0.8的相似处有一个明显的优势类群,而桐乡种群未表现出优势性。上述分析可知,家蚕灰僵病病原种群表现出与地理来源相关的空间异质性,种群异质性是地方病种群维持的重要原因。

关键词: 家蚕, 灰僵病, 爪哇棒束孢, 地方病, ISSR

Abstract: Fungal pathogen Isaria javanica can cause a low rate of silkworm grey muscardine. In this study, two I. javanica populations collected from Qianshan and Tongxiang were fingerprinting analyzed using ISSR markers. In the assayed 19 isolates, 120 discernible DNA bands ranging in size from 200 to 2000 bp were generated by 12 ISSR primers, and 93 of the bands (70.45%) were polymorphic. Nei's gene diversity (h) and Shannon's Information index (Is) showed a similar trend with the percentage of polymorphism at the population level. At the point of genetic similarity coefficient 0.76, the strains could be divided into 2 groups which correlated with the geographic origin of sampling. The result of 3-D principal coordinate analyses (PCA) based on ISSR data shared high similarity with UPGMA cluster analysis. The gene flow (Nm) between the two populations was 0.5678, and the genetic differentiation coefficient (Gst) was 0.3287, which indicates higher genetic diversity between populations than within populations. Single population clustering results showed that Qianshan population had an evident dominant group at the genetic similarity coefficient of 0.8, while Tongxiang population did not have a predominant lineage. Based on the analyses above, we can conclude that pathogen populations causing enzootic grey muscardine are geographically heterogenous, which may be an important factor for the maintenance of enzootic populations.

Key words: Bombyx mori, grey muscardine, Isaria javanica, enzootic, ISSR

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