Abstract:
Aiming to explore germplasm resources of the local sun-cured tobacco which were resistant to the tobacco black shank was identified in field period in this study in order to the methods identification the tobacco black shank in breeding. The result showed that there were significant differences in resistance among different species. The 13 species were high-resistance varieties such as Jipizhong, Buye637 and so on. Cunsanpi; Hanguyan, Kumaye, Baiyandahua were medi-um-resistance varieties; susceptible varieties were Bagumaoyan and Mayangquanyan. The study was conducted on the relationship between biochemical reactions and resistance mechanisms of the 10 species with different resistance to tobacco black shank. The results showed that the resistant varieties polyphenol oxidase, superoxide dismutase activity, wood hormone levels of the resistant species after artificial inoculation were higher than susceptible ones.