中国发生马铃薯晚疫病菌（Phytopthora　infestans）A_2交配型

The occurrence of potato late blight pathogen (Phytophthora infestans ) A_2 mating type in China

北京，内蒙古、山西和云南省等省区的１０个菌株，在黑麦琼脂培养基和立马豆Ｖ—８琼脂培养基上进行交配型试验，发现其中３个菌株为Ａ２交配型，７个菌株为Ａ１交配型。Ａ２交配型菌株采自内蒙古自治区和山西省。对卵孢子、藏卵器和雄器的形态进行了描述。ｔｅ，ａ＊ｆｆｎ．ＷｈｅｔｈｅｒＡ，ｅｘｉｓｔｓｏｒｎｏｔｉｎＣｈｉｎａｈａｓｎｅｖｅｒｂｅｅｎｓｔｕｄｉｅｄｂｅｆｏｒｅ．Ｉｎ１９９５ｗｅｂｅｇａｎｔｈｅｉｌｌｖｅｓｔｉｇａｔｉｏｎａｎｄｄｉｓｃｏｖｅｒｅｄＡ，ｉｎＣｈｉｎａ＇Ｔｈｅｐｒｅｌｉｍｉｎａｒｙｒｅｓｕｌｔｓｏｆｔｈｅｓｔｕｄｙｗｅｒｅｐｒｅｓｅｎｔａｓｆｏｌｌｏｗ．ＴｈｅｏｂｊｅｃｔｉｖｅｓｏｆｔｈｉｓｓｔｕｄｙｉｓｔｏｆｉｎｄｏｕｔｂｙｓｕｒｖｅｙｗｈｅｔｈｅｒｔｈｅＡ，ｍａｔｉｎｇｔｙｐｅｅｘｉｓｔｓｉｎＣｈｉｎａ，ａｎｄｆｕｒｔｈｅｒｒｅｓｅａｒｃｈｏｎｔｈｅｉｍｍｉｇｒａｔｉｏｎ，ｍｏｖｅｍｅｎｔ，ｒｅａｓｏｎｆｏｒｄｅｖｅｌｏｐｍｅｎｔａｎｄｅｐｉｄｅｍｉｏｌｏｇｙｏｆｔｈｅＡ，ｗｏｕｌｄｂｅｃａｒｒｉｅｄｏｕｔｌａｔｅｒ．１Ｍａｔｅｒｉａｌｓａｎｄｍｅｔｈｏｄｓｌ＇１ＣＯｌｌｅｃｔｉｏｎｏｆｓａｍｐ?

isolates of Phytophthora infesfans collected from in blighted potato fields in 4 different provinces (Beijing, Inner Mongolia, Shanxi, Yunnan) in 1995 were examined for mating type on lima beau and rye agar medium, the mating experiment indicated that 7 out of 10 strains used was A, mating type, the rest 3 strains were A2, of which 2 strains were collected from experimental field of Wumeng Agricultural Institute, 1 from Wuzhai Research Station in Shanxi province.The characteristic of oogonium, antheridium and oospore were described and photograph were attached.