【摘要】 以黑龙江省3个地区洋葱紫斑病植株为试材,采用组织分离法分离洋葱紫斑病病原菌,对获得菌株进行致病性测定、形态学鉴定以及16srDNA ITS序列分析,并研究其生物学特性。结果表明:该致病菌为葱链格孢菌(Alternaria porri(Ell.)Cifferri),该菌株在以葡萄糖为碳源时产孢量最高,但菌丝生长量最低;在以氯化铵为氮源时菌丝生长量和产孢量都达到最高。32℃,pH 7,光照条件为12h光照/12h黑暗交替培养菌丝生长量最高;24℃,pH 8,连续黑暗条件下产孢量最高。更多还原

【Abstract】 The plant of onion violet leaf spot was used as test material which was isolated from onion in three areas of Heilongjiang Province.The pathogen of onion violet leaf spot was isolated by tissue isolation,and the pathogen was identified by morphological and 16 srDNA ITS sequence analysis and the biological characteristics were conducted.The results showed that the pathogen of onion violet leaf spot was Alternaria porri(Ell.)Cifferri.When glucose was used as carbon source,the spore production was the highest,but the amount of mycelium growth was the lowest.When the ammonium chloride was the nitrogen source,the amount of mycelium growth and spore production reached the highest.The mycelium growth was the highest at 32℃,pH 7,and the condition was 12 hlight 12hdark alternate culture;the spore production was the highest at 24℃,pH 8under continuous dark conditions.更多还原