【摘要】 本文通过40个大豆品种的抗大豆花叶病鉴定,阐述了种传率、褐斑率和成株抗性三个抗性鉴定指标及相互关系。结果表明:种传率、褐斑率、成株抗性分别受不同基因控制。植株感染病后,任一指标为抗性,三项指标间不存在相关性。病株种子出苗率(种子活力)下降主要受种传率影响,与褐斑率、病情指数关系不大。在田间自然传毒情况下,褐斑率、种传率均随成熟期的推迟而加重。这是原始病株(带毒种子产生的病苗)、蚜虫消长及在同一时间内,不同熟期品种生长发育期不同所致,不能反映品种本身的抗性水平。更多还原

【Abstract】 Three testing, seed transimission rate, seedcoat mottling rate, and disease index, were analysed by 40 soybeans resistant to soybean mosaic virus (SMV). Result showd that seed transimis-sion rate, seedcoat mottling rate and plant resistance were controlled by diffenrent genes, seed transmission rate resulted in reduction of seedling rate of the diseased plant, but hot the seedcoat mottling rate and disease imcidence and severity. As soybean maturity postpc eds the seed transimission rate and the seedcoat mottling rate increased under infection conditions in the field.更多还原