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对４个不同抗性的甘薯品种经苗茎剪口接种蔓割病菌后，测定叶片多酚氧化酶（ＰＰＯ）活力及其同功酶，结果表明：接种第２ｄＰＰＯ活力上升，ＰＰＯ活力病／健比值大于１，抗、感病品种之间差异不明显，第４、８ｄ抗、感病品种ＰＰＯ活力都下降，ＰＰＯ活力病／健比值小于１，并且感病品种比值小于抗病品种；在接种的第８ｄ叶柄ＰＰＯ同功酶带没有增加，抗病品种扫描表面活力变化不大，而感病品种ＰＰＯ同工酶酶谱颜色加深，条带不清，扫描表面活力明显降低．上述结果可作为鉴别品种抗性的生理指标
Four sweet potato cultivars with different resistances were inoculated with the pathogen of pathogenic bacteria after inoculation. The activity of polyphenol oxidase (PPO) and its isozymes were measured. The results showed that the activities of PPO activity increased The ratio of PPO activity / health was lower than 1, and the ratio of susceptible and disease-resistant PPO was less than 1, and the ratio of susceptible and disease-resistant PPO was less than that of resistant varieties; The PPO isoenzyme bands of the 8th petiole did not increase, the resistance of the resistant varieties did not change much on the surface of the resistant cultivars, while the susceptible PPO isoenzyme zymograms deepened, the bands were unclear and the scanning surface vitality was obviously decreased. The above results can be used as a physiological index to identify the resistance of cultivars