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对８个番茄品种分别在种子发芽期用番茄早疫病粗毒素和在苗期用病原菌孢子人工接种进行了抗性鉴定和抗性植株筛选。结果表明，不同番茄品种对粗毒素的抗性与对病原菌的抗病性明显相关，用粗毒素鉴定的成活率与用病原菌孢子接种鉴定的病情指数的相关系数为ｒ＝－０．８４５，其绝对值大于ｒ０．０１＝０．８３４，达极显著水平。用粗毒素筛选出的抗性植株经人工接种病原菌孢子进行抗病性鉴定表明均属抗病。因此，可用致病毒素在种子发芽期进行抗病性鉴定和抗病植株的筛选。
The resistance of eight tomato cultivars were determined by using the crude toxin of early blight of tomato and the artificial inoculation of the pathogen spores at the seed germination stage. The results showed that the resistance of different tomato varieties to crude toxin was significantly related to the pathogenicity of the pathogen. The correlation coefficient between the survival rate identified by crude toxin and the disease index identified by pathogen sporulation was r = -0.845, The absolute value is greater than r0.01 = 0.834, reaching a significant level. The resistant plants screened by crude toxin were pathogenically identified by artificial inoculation with pathogen spores. Therefore, pathogenicity identification and screening of resistant plants can be carried out with the virulence factors in the seed germination period.