Acta Agrestia Sinica

›› 2004, Vol. 12 ›› Issue (4): 285-288,297.DOI: 10.11733/j.issn.1007-0435.2004.04.007

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Occurrence of Fusarium Root Rot in Astragalus adsurgens and Identification of the Pathogens

ZHOU Hong-you1,2, YANG He-tong3, TANG Wen-hua1   

  1. 1. Department of Plant Pathology, China Agriculture University, Beijing 100094, China;
    2. College of Agronomy, Inner-Mongolia Agriculture University, Huhhot, Inner Mongolia Autonomous Region 010019, China;
    3. Biotechnology Research Center, Shandong Academy of Sciences, Jinan, Shandong Province 250014, China
  • Received:2003-10-09 Revised:2004-01-13 Online:2004-11-15 Published:2004-11-15

沙打旺根腐病发生及病原菌鉴定

周洪友1,2, 杨合同3, 唐文华1   

  1. 1. 中国农业大学植物病理系, 北京, 100094;
    2. 内蒙古农业大学农学院, 呼和浩特, 010019;
    3. 山东省科学院生物技术研究中心, 济南, 250014
  • 通讯作者: 唐文华
  • 作者简介:周洪友(1968- ),男,河北抗宁人,讲师,博士研究生,研究方向为植物病害生物防治研究;唐文华,通讯作者Authorforcorrespondence

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Abstract: An investigation on milk vetch (Astragalus adsurgens) root rot was conducted in Chifeng City, Inner Mongolia Autonomous Region. The result shows that with the plant advances in age, its pathogenicity grows. A plant of 3 to 5 years of age succumbs to the disease at an 100% rate, and the disease index reaches 85 or even higher. The re-greening rate in spring of a 4-or 5-year-old milk vetch plant is as 68.8% or 54.8%, and their tillers re-greening rate is 20%～30% only. Pathogenicity tests on 19 species of Astragalus in greenhouse show that two fungal cultures isolated from a diseased milk vetch plant could infect A. adsurgeus, Medicago varia Martin cv., and Melilotus ofliciralis. Based on the morphological and pathogenicity study, the two isolates which caused root rot of A. adsurgens are identified as Fusarium solani f. sp. astragali, and Fusarium oxysporum f. sp. astragali.

Key words: Grassland science, Astragalus adsurgens, Fusarium root rot, Pathogens, Identification, Host range

摘要： 调查内蒙古赤峰沙打旺根腐病发生情况,结果表明沙打旺株龄越高,根腐病发病率和严重度越高,3～株龄发病率达100%,而病情指数则在8以上;4株龄和株龄沙打旺的返青率较低,分别为68.8%和4.8%;分枝返青率不到30%和20%.依据柯赫氏法则自典型病株分离病原菌,经鉴定,致病菌株为茄病镰刀菌和尖孢镰刀菌.对19种植物进行温室接种实验,结果表明两菌株均对沙打旺、鹰嘴紫云英、蒙古黄芪、达呼里黄芪、草木樨状黄芪等黄芪属植物有致病性.寄主范围试验表明,病原菌初步定为沙打旺茄病镰刀菌黄芪专化型(Fusarium solani f.sp astragali Sad 1)和尖孢镰刀菌黄芪专化型(Fusarium oxysporum f.sp astragali Sad 2).

关键词: 草原学, 沙打旺, 根腐病, 病原菌, 鉴定, 寄主范围

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