黄淮区大豆花叶病毒株系组成与分布

 用8个大豆品种作为一组株系鉴别寄主,将黄淮豆区8省市202个毒株划分为7个株系(y₁~y₇)。y₁及y₂为弱毒株系,仅侵染感病品种(1138-2、文丰5号);y₃、y₄、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及y₇为强毒株系,除侵染以上品种外,还侵染高抗品种(齐黄22、密荚1号)。全区弱毒株系占55.9%,中毒株系占28.7%,强毒株系占15.3%。江苏、山东、河南、河北、安徽和北京市以弱毒株系为主(43.5%~88.9%),山西省以中毒株系为主(50.0%),陕西省弱毒株系、中毒株系各占50.0%,山东、河南、河北3省强毒株系所占比例较高(22.4%~33.3%)。株系分布具有一定的稳定性。

CLASSIFICATION AND DISTRIBUTION OF STRAINS OF SOYBEAN MOSAIC VIRUS IN HUANG HUAI AREA OF CHINA

Two hundred and two samples of soybean mosaic virus(SMV)collected from seven provinces and one city were identified and classified into seven strains(y 1-y 7) based on disease reaction on eight soybean cultivars. The y 1 and y 2 were the low virulence strains, which only infected susceptible cultivars (1138 2 and Wenfeng 5). The y 3, y 4 and y 5 were the moderately virulence strains, which infect susceptible and moderately resistant cultivars (Qihuang 10,Xudou 1,Youbian 30 and Ludou 4). The y 6 and y 7 were the high virulence strains, which not only infected above six cultivars but also two resistant cultivars (Qihuang 22 and Mijia 1). The low virulence strains, moderately virulence strains and high virulence strains account for 55.9%,28.7% and 15.3% of SMV in Huang Huai area,respectively. Most strains of SMV in Jiangsu, Shandong, Henan, Hebei, Anhui and Beijing were low virulence ( 43.5% -88.9%). In Shanxi province, moderately virulence strain was predominant (50.0%). The low virulence strains and moderately virulence strains were 50.0% each in Shaanxi province. The rate of high virulence strains was higher in Shandong, Hebei and Henan provinces (22.4%-33.3%). The distribution of SMV strains in Huang Huai area was stable to some extent.