Author : Ngamchuen Kaowichian

Summary : Six populations from each of five families differing in degree of heterozygosity and heterogeneity were evaluated for phenotypic stability in eleven environments. The degree of heterozygosity among individuals in a population are not very important factors in determining stability in sorghum. There was a strong relationship between average yield and stability. High yielding population were the most unstable indicating that high yield and phenotypic stability do not usually reside in the same variety. Heterosis and inbreeding depression were evaluated in the F1 and in the F4 population. As expected, heterosis and inbreeding depression were closely related with each other. Furthermore, heterosis was most pronounced in environment where average yield was high. It is apparent that F1 population would be most useful for favorable environment.