中国农业科学 ›› 2007, Vol. 40 ›› Issue (5): 925-931 .

• 植物保护 • 上一篇    下一篇

河北省西瓜枯萎病菌生理小种鉴定与AFLP分析

段会军,张彩英,李喜焕,郭小敏,王省芬,马峙英   

  1. 河北农业大学/河北省作物种质资源重点实验室
  • 收稿日期:2005-01-22 修回日期:1900-01-01 出版日期:2007-05-10 发布日期:2007-05-10
  • 通讯作者: 马峙英

Differentiation of pathogenicity and AFLP analysis ofFusarium oxyporum f sp niveum

  1. 河北农业大学/河北省作物种质资源重点实验室
  • Received:2005-01-22 Revised:1900-01-01 Online:2007-05-10 Published:2007-05-10

摘要: 【目的】明确河北省西瓜枯萎病菌生理小种类型和遗传多样性,为西瓜抗病育种和西瓜枯萎病的综合防治提供依据。【方法】本文对采自河北省12个西瓜种植地区的46个西瓜枯萎病菌菌株和4个已知生理小种的菌株进行了致病性测定和AFLP分析。【结果】根据菌株对3个鉴别寄主表现出的致病性强弱,将河北省46个西瓜枯萎病菌菌株划分为3个不同的生理小种,即0号、1号和2号,分别占供试菌株的17.4%、65.2%和17.4%,其中1号生理小种为优势小种,分布在河北省所有西瓜种植区。21对AFLP引物对供试菌株扩增出1 157条带,其中多态性带389条,占总带数的33.6%。河北省西瓜枯萎病菌的遗传距离变化在0.33~0.95之间,平均为0.66,群体遗传多样性比较丰富。基于AFLP标记聚类分析表明,50个菌株被划分为3个类群(AFLP Groups,AGs)。AGI包含4个菌株,均为2号生理小种;AGII包括4个菌株,均为0号生理小种;AGIII包括42个菌株,以1号生理小种为主(32个),占该类群的76.2%。【结论】河北省西瓜枯萎病菌存在明显的致病性分化,其AFLP类群划分与致病性鉴定划分的生理小种之间存在一定相关性,但与菌株的地理来源无关。

关键词: 西瓜, 西瓜枯萎病菌, 生理小种, 致病性, AFLP

Abstract: Abstract: The pathogenicity and AFLP genetic differentiation of 46 Fusarium oxysporum f.sp niveum isolates from Shijiazhuang,Baoding,Tangshan etc. watermelon growing areas and 4 identified races from other regions were analyzed. The result showed that based on the different responses of three common identified hosts, the 50 isolates were classified into 3 physiologic races, 0 (18%)、1 (64%) and 2 (18%) , respectively. Of the total bands, 1157 AFLP bands were amplified by using 21 pairs of primers, among them, 389 ( 33.6%) were polymorphic; when all of polymorphic bands were analyzed by cluster analysis, 50 isolates were classified into3 groups: AGI, which included 5 physiologic race 2 ; AGII, including 4 physiologic race 0; AGIII, 42 isolates, which included 32 physiologic race 1 (76.2%) .It was concluded there existed obvious differentiation of the pathogenicity of Fusarium oxysporum f.sp. niveum in Hebei, and AFLP groups were generally associated with the different races.

Key words: Fusarium oxysporum f.sp. niveum, differentiation of pathogenicity, AFLP analysis