Effect of clammy climate on the germination of tobacco varieties (lines) in the Yunnan-Guizhou plateau

To evaluate the viability of tobacco varieties during low temperature and high humidity environment,20 tobacco varieties were used to germination in 8-10 ℃,RH60%,day and night 12 h alternated.The results showed that the range of the germination percentage of tobacco varieties were 78.67%-98.00%,and CV was 6.62%.Solution conductivity and relative conductivity had significant correlation with a value and significant negative correlation with h value.Germination rate had significant correlation with 1000-grain weight and significant negative correlation with electric conductivity.20 tobacco varieties were divided into clammy tolerance types,common types and clammy sensitivity types.The study also selected Guiyan-201,K326,Yunyan-87,Hongda,four clammy tolerance varieties according to seed color,vitality and germination rate.