To study the mechanism of tobacco cytoplasmic male sterility, high-performance liquid chromatography was used to measure the contents of endogenous hormones(ZRs, iPAs, GA, ABA and IAA)in leaves and buds of tobacco cv. K326, K394 and Yunyan 87 with male-sterile and maintainer lines, and the ratios between different endogenous hormones were also analyzed. The results showed that except for the seedling stage of Yunyan 87, the content of IAA in leaves of maintainer lines was higher than that of male-sterile lines in all the cultivars. At flower-bu...