致病疫霉两种交配型的致病性及对不同碳氮比例的反应  

Pathogenicity and Response of Phytophthora infestans to C/N Ratio

作　　者：苏海鹏[1] 罗文富[1] 杨艳丽[1] 肖霞[1] 

机构地区：[1]云南农业大学云南省植物病理重点实验室,云南昆明650201

出　　处：《云南农业大学学报》2004年第6期661-665,共5页Journal of Yunnan Agricultural University

基　　金：云南省自然科学基金项目(97C023M);云南省科技厅攻关项目(2002NG9)。

摘　　要：对云南省分离到的7个晚疫病菌A2交配型菌株的致病性及对不同碳氮比(C/N)的反应进行了研究。结果表明:单个的A2交配型菌株、A2+A1交配型菌株孢子囊接种致病性无显著差异,但均比对照的A1交配型菌株接种致病性强。在C/N比为4∶1,3∶1,2∶1时,A2菌株的生长速率比A1菌株慢,C/N为1∶2,1∶3,1∶4时A2菌株比A1菌株生长快,在C/N为2∶1时,A1与A2菌株各自生长最快。在不同C/N条件下A2产孢量都比A1少,在C/N为2∶1时,A1与A2各自产孢最多;C/N对A2交配型菌株的游动孢子释放有影响,在碳氮比为3∶1时,A2的游动孢子释放率明显高于A1菌株。Effect of C/N ratios on two mating type isolates and pathogenicity of Phytophthora infestans were studied in the laboratory. A2 pathogenicity was stronger than A1, the mixture of A1 and A2 was not different from A2 in pathogenicity. The different C/N ratios influenced the mycelial growth, sporangia yield and zoospore release. The favourable C/N ratio was 2∶1 to mycelial growth, but 3∶1 to zoospore release for A2 mating type isolates.

关 键 词：晚疫病菌 交配型 致病性 马铃薯 晚疫病 

分 类 号：S435.32[农业科学—农业昆虫与害虫防治]