Regression and AMMI Analysis in early set barley genotypes in Northwest Ethiopia
2006
Alamnie Atanaw | Setie Agmas | Tadesse Dessaliegn
Barley is an important crop for the northwest parts of Ethiopia. Its productivity is low and there are very few released varieties for the early production system. Identification of genotypes with high yield and general adaptability is an indispensable task. A significant G x E interaction for quantitative trait such as grain yield can seriously limit progress in selection. Therefore, testing selected materials over locations and years to ensure that forth coming cultivars have stable performance is a universal practice. Fifteen genotypes (including a local and a standard check) were tested at three locations (Adet, Mota and Debre Tabor) for three years (1999-2001) with the objective of identifying high yielding and stable materials. Randomized complete block design with three replications was used. Analysis of variance showed highly significant difference among genotypes, environments and genotype x environment (G x E) interactions. Regression and AMMI (additive main and multiplication interaction) analyses were employed in order to determine the stability of genotypes. Accordingly, genotype 3371-03 was found to be the most stable and high yielding genotype 3371-03 was found to be the most stable and high yielding genotype and was released for large-scale production to improve the productivity and production of barley in the early barley production in the early barley production system of the region.
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