Identification of flue-cured tobacco germplasm resources resistant to brown spot disease

In order to explore and utilize flue-cured tobacco germplasm resources resistant to brown spot disease，screen new resistant resource and broaden genetic basis of parents for tobacco brown spot resistance breeding，resistance to brown spot disease of 390 tobacco germplasm resources from different sources were identified in the present study. The results showed that 10 flue-cured tobacco germplasm resources were resistance to brown spot disense from 61 local cultivars in Guizhou，which were Xiaofeng No. 8，Meitan-2，Qianjiang No. 1，Dafang， YA-2，Huishui-1，Huishui-2，Fuquan-1，Fuyan No.6 and YQ-1，respectively. Only one germplasm Zijiang No. 1 from 90 cultivars bred in Guizhou had resistance to brown spot disease. Among 105 introduced varieties outside Guizhou province，ten of them including Yunyan 100，Yuanyan 110，Danyu No.2，Zhongyan 86，Dabaijin 599， Xujin No.4，Longjiang 911，Liaoyan 8100，Jingyehuang and Pangyuanhuang were detected resistant to brown spot disease. Two germplasm Coker spedlgred and Oxford 26 of 134 introduced varieties abroad had resistance to brown spot. In conclusion，flue-cured tobacco germplasm resources resistant to brown spot disease are most abundant in local cultivars in Guizhou，which can be used as new resistant resources for tobacco brown spot resistance breeding.