Genotype x Environment Interaction and Yield Stabiligy in climbing Bean (paseolus vulgaris L.) Varieties.
2005
Chemeda Daba and Negash Geleta and Abeya Temesgen and Firdissa Eticha
Yield stability in eight climbing bean varieties was studied for two years across four locations with the objective of identifying stable varieties. The combined analysis of variance showed that varietal differences were significant for seed yield, days to flowering, days to maturity and number of seeds per pod. Significant year x genotype x location interactions were observed for seed yield, days to flowering, days to maturity, and seeds per plant. Genotype x environment interaction was not significant indicating that the yield of the varieties across the environments is not predictable. Pooled mean grain yield was highly significant suggesting that the observed deviations of all the varieties from the expected performances are different in magnitude due to the unpredictable causes of G x E interaction. The released variety, 812-BRC-28, was the top ranking variety in grain yield and showed maximum stability. Four genotypes, 813- BRC-29, 829-BRC-20, 852-BRC-27 and the local check were adaptable to favorable environments, while 850-BRC-21 adapted to poor environments.
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