福建省番茄晚疫病菌生理小种鉴定分析

Identification and Analysis on Physiological Races of PhytophthorainfestansIsolated in 2014 from Tomatoes in Fujian

摘要: 为明确福建省番茄晚疫病菌生理小种组成结构,利用5个鉴别寄主对2014年分离自福建省的78株番茄晚疫病菌的生理小种进行测定。研究结果表明,供试的番茄晚疫病菌由T1、T1,2、T1,5、T1,3,4、T1,2,5、T1,2,3,4和T1,2,3,4,5共7个小种组成,其中T1,2地理分布最广,出现频率最高,占鉴定总数的28.20%,为福建省番茄晚疫病菌优势小种,毒力频率分析显示,对5个抗番茄晚疫病基因Ph-1、Ph-2、Ph-3、Ph-4和Ph-5有毒力的毒性基因出现频率依次为100%、64.1%、35.09%、35.09%和26.92%,表明Ph-1和Ph-2在福建省已丧失抗性。

Abstract: The physiological races of Phytophthora infestans isolated in 2014 from tomatoes in Fujian were studied.Seven physiological races from the 78 isolates were identified in 5hosts.Among them,T1,2 was the most widely distributed and predominant in the province with an appearance frequency of 28.20%.The occurrence frequency of the virulent genes resistant to Ph-1,Ph-2,Ph-3,Ph-4and Ph-5 were 100%,64.1%,35.09%,35.09% and26.92%,respectively.It appeared that the tomato cultivars carrying Ph-1and Ph-2genes had become susceptible to the prevalent races of P.infestans in Fujian.