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黄瓜霜霉病菌侵染若干因子的研究

石延霞1;李宝聚1;刘学敏2   

  1. 1中国农业科学院蔬菜花卉研究所,北京 100081;2东北农业大学植物保护系,哈尔滨 150030

  • 收稿日期:2003-11-04 修回日期:2004-07-16 出版日期:2005-02-18

Several infection factors of Pseudoperonospora cubensis

SHI Yanxia1,LI Baoju1,LIU Xuemin2   

  1. 1Institute of Vegetables and Flowers,Chinese Academy of Agricultural Sciences,Beijing 100081,China;2Northeast Agricultural University,Harbin 150030,China

  • Received:2003-11-04 Revised:2004-07-16 Online:2005-02-18

摘要: 研究了温、湿度条件对黄瓜霜霉病菌致病性的影响,结果表明,25~35 ℃最适宜黄瓜霜霉病的发生,15/35 ℃的交替温度变化最有利于霜霉病菌的侵染,但35 ℃以上的高温对霜霉病菌具有杀伤作用;2 h的湿度条件就足以引起侵染,一旦侵入寄主,环境湿度条件对病害的发展影响不大.-20 ℃低温冷冻保存10个月和干燥放置7 d的霜霉菌种仍具致病力.发病的黄瓜叶片可以连续产生孢子囊,但随着发病时间的延长产生孢子囊量逐渐减少.活体叶片单位面积上产生的孢子囊量比离体叶片大,且显症天数与叶片单位面积产生孢囊量呈抛物线型关系.

关键词: 低温, 弱光, PI值, 超氧化物歧化酶, 愈创木酚过氧化物酶, 丙二醛

Abstract: The study on the effects of temperature and humidity on the pathogenicity of Pseudoperonospora cubensis showed that the optimum temperature for the occurrence of cucumber downy mildew was 25~35 ℃.An alternation of 15/35 ℃ was the most propitious to the infection of Pseudoperonospora cubensis, while the high temperature above 35 ℃ could kill the pathogens.2 hours humid was enough for infection.Pseudoperonospora cubensis stored at -20 ℃ for 10 months and dried for 7 days could still infect cucumber.The infected cucumber leaves could continuously produce sporangium,with its quantity gradually decreased with time.The quantity of sporangium produced in vivo was more than that in vitro.

Key words: Chilling, Low light, PI, SOD, POD, MDA