黄淮地区大豆花叶病毒株系鉴定

用８个大豆品种作为一组株系鉴别品种，将黄淮豆区７省１市２０２个毒株划分为７个株系（ｙ１～ｙ７）。ｙ１～ｙ２为弱毒株系，仅侵染感病品种（１１３８－２、文丰５号）；ｙ３～ｙ５为中毒株系，分别侵染感病和中抗品种（齐黄１０号、徐豆１号、诱变３０、鲁豆４号），ｙ６～ｙ７为强毒株系，ｙ６除密荚１号外侵染齐黄２２等７个品种，ｙ７侵染所有８个鉴别品种，引起叶脉坏死症状。全区以弱毒株系为主（５５９％），中毒株系占２８７％，强毒株系占１５３％。明确了各地区株系的分布与流行趋势。株系分布具有一定的稳定性。

Classification and Distribution of Soybean Mosaic Virus Strains on Huang-huai Plain of China

wo hundred and two plants of soybean mosaic virus(SMV)collected from seven provinces and one city were identified and classified into seven strains based on disease reactions of inoculated eight soybean varieties.Among them the y1-y2 were less virulence strains which only infected susceptible varieties as Nanjing 1138-2 and Wenfeng 5,y3-y5 were medium virulence strains which could infect the susceptible or medium resistant varieties as Qihuang 10,Xudou 1,Youbian 30 and Ludou 4,and y6-y7 were high virulence strains which infected seven or all eight varieties.Distribution of the seven strains on Huang-Huai plain was ascertained.