大白菜黑腐病鉴定的湿度试验及其苗期与成株期抗病性的相关分析

对北京新4号、北京新1号、北京大牛心、京翠70号、京翠60号、京秋65号6个大白菜品种进行苗期黑腐病鉴定的湿度试验及其苗期和成株期抗病性的相关性分析。结果表明：试验材料之间对黑腐病的抗性存在显著差异，其中北京新1号抗性最强。比较不同保湿处理下的病情指数，表明湿度是影响黑腐病发病的关键因素。用DPS软件对6个大白菜品种的苗期和成株期抗性的相关性进行回归分析，表明苗期人工接种（接种前不保湿，接种后保湿24 h）和成株期的病情指数存在显著线性相关，说明用苗期人工接种鉴定大白菜黑腐病抗性的方法是可靠的。

Humidity Test of Chinese Cabbage Black Rot Identification and Correlation Analysis of Its Seedling and Adult-plant Resistance

Taking Chinese cabbage〔Brassica campestris L. ssp. pekinensis（Lour）olsson〕‘Beijingxin No.4’, ‘Beijingxin No.1’, ‘Beijingdaniuxin’, ‘Jingcui No.60’, ‘Jingcui No.70’, ‘Jingqiu No.65’as tested materials, humidity test and correlation analysis of Chinese cabbage seedling and adult-plant resistance to black rot were studied. The result indicated that there existed significant differences among different Chinese cabbages for black rot resistance and‘Beijingxin No.1’had the strongest resistance to black rot. Comparing disease indexes under different wet conditions, we found moisture was the key factor affecting black rot occurances. Using DPS software to conduct regression analysis and analyzing the correlation between artificial inoculation disease index of black rot in seedling stage and in adult plant stage, we found the results were that there existed notable linear correlation between artificial inoculation in seedling stage（before inoculation no moisture and after inoculation moisture for 24 h）and the disease index in adult-plant stage, and the method of artificial inoculation in seedling stage to identify resistance to black rot is reliable.