关键词: 烤烟, 抗旱敏感指标, 抗旱系数, 隶属函数

Abstract: The technology of tissue culture on five flue-cured tobacco varieties (Hong da, K326, NC82, G28, RG11) which were screened and evaluated for drought resistance using the average of subordinate function value based on morphological indexes and physiological indexes closely related to drought resistance were studied. The results showed that plant fresh weight, taproot length, total length of lateral root, root system vigor, chlorophyll content and protoplasmic membrane penetrable of a tobacco variety under normal conditions differed remarkably from those of the same variety under osmotic stress treatment, and fresh weight, total length of lateral root and permeability of plasma membrane were the sensitive indexes of drought resistance of flue-cured tobacco. In addition, the study indicated that drought resistance in different tobacco varieties was highly variable, and the descending order of drought resistance was NC82, RG11, Hong da, G28, K326. Meanwhile,this techniques could be used in screening and evaluation of varietal resistance of tobacco germplasm resources

Key words: flue-cured tobacco, sensitive indexes of drought resistance, drought resistance coefficient, subordinate function