1983年调查了4个组合 F_2的柱头外露率。IR36/6209-3F_2群体不呈正态分布,6209-3的高柱头外露率为完全显性,表现质量性状遗传,容易通过杂交而转育。其余组合 F_2接近正态分布,表现为数量性状遗传。IR36/6209-3F_2的柱头外露长度和宽度,都接近正态分布,也属数量性状遗传。柱头外露率,外露长度和宽度在 F_2群体中都有超高亲个体出现,都可在选育不育系中加以利用。 In 1983, the stigma exsertion rates of four combinations F_2 were investigated. The populations of IR36 / 6209-3F_2 were not normally distributed. The high stigma exsertion rate of 6209-3 was completely dominant, and the quality traits were inherited, which were easily transferred by crossbreeding. The remaining combinations F 2 close to normal distribution, the performance of the quantitative trait genetic. The stigma exsertion length and width of IR36 / 6209-3F_2 are close to the normal distribution, which is also a quantitative trait inheritance. The stigma exsertion rate, the exposed length and the width all appeared in F_2 population, and all of them could be used in breeding male sterile line.