The yield stability of sorghum varieties and hybrids in East African environments

Majisu, B.N. and Doggett, H. (1972) The yield stability of sorghum varieties and hybrids in East African environments. East African Agricultural and Forestry Journal, 38 (2). pp. 179-192.

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Evaluation of varieties and hybrids for yield stability, that is, the ability to show minimum interaction with the environment, was carried out in a series of East African environments below 5000 ft during 1966-70. Grain yield data were analysed by partitioning genotype X environment interactions into linear components and deviations therefrom. Genotype X environment interactions were significant in all years and genotypes usually differed significantly in their regression on environments. The varieties Serena and Dobbs had mean yields above the grand mean and regression coefficients close to unity but their deviation mean squares were undesirably large. Some genotypes showed evidence of good yield stability but their superiority over local improved varieties was in doubt. Hybrids were the highest-yielding entries in each year and some showed a marked tendency to improved response under more favourable environments. There was no convincing evidence of stability differences between varieties and hybrids as broad genotype groupings. It is suggested that only highly heterotic and stable hybrids would be expected to show relative yield advantage over equally stable varieties

Item Type: Article
Author Affiliation: Sorghum and Millets Unit, Serere, Uganda
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 01 Jun 2012 08:28
Last Modified: 01 Jun 2012 08:28

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