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Asian Journal of Plant Sciences
Year: 2014  |  Volume: 13  |  Issue: 2  |  Page No.: 73 - 79

Genotype X Environment Interaction and Yield Stability of Malt Barley Genotypes Evaluated in Tigray, Ethiopia Using the Ammi Analysis

Muez Mehari, Sentayehu Alamerew and Berhane Lakew    

Abstract: Eight malt barley genotypes were evaluated in randomized complete block design using three replications at six locations in Tigray region during 2013/2014 main cropping season. The objective of this study was to quantify the magnitude of genotype by environment interaction and yield stability of malt barley genotypes. The additive main effect and multiplicative interaction effect model (AMMI) analysis revealed significant difference (p<0.01) for genotypes, locations and genotype by location interaction. The magnitude of the testing location was greater than the genotype by location interaction and the genotype. This indicates that the testing locations were diversified in discriminating the genotypes. The AMMI model clearly demonstrates the genotype by location interaction by partitioning into two significant interaction principal components that capture 83.84% of the genotype by location interaction. According to the stability analysis of the additive main effect and multiplicative interaction effect Stability Value (ASV) and the AMMI 1 biplot analysis the genotype Bekoji and Fire-Gebs were the most stable coupled with higher grain yield greater than the grand mean where as the genotypes Sabini and HB-1533 were unstable. Using the AMMI 1 biplot analysis, the testing locations, korem, Hashange, Mekhan and Emba-hasti were favorable testing locations whereas Hagara-Selam was unfavorable testing location.

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