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Phenotypic Stability of Grain Sorghum Population
Thesis Abstract:
The phenotypic stability of sox sorghum populations derived from each of five crosses was evaluated in 11 different environments in Thailand. The populations included two parents, F1, f2, a mixture of f4 lines and mixtures of the two parents.
Results showed that the pure line the most stable and F1 the least while the mixtures of the two parents exhibited phenotypic stability intermediate between them, strongly indicating that stability in sorghum does not depend on the degree of heterozygosity and heterogeneity among individuals Average yielders were the most stable, whereas the high yielders were the most unstable.
Evaluation of heterosis and inbreeding depression in the F1 and F4 populations showed a close relationship between the two factors. Moreover, heterosis was most pronounced in environment with high average yield, suggesting the capability of good genotypes, such as the F1 hybrid, to fully utilize favorable environmental features.
Among the five characters measured, inbreeding depression was slowest in grain yield, indicating the high complexity of this character.