Stability Analysis of Bread Wheat Genotypes Using the AMMI Stability Model at Southeast Oromia

Abstract

Ethiopia is the largest wheat producer in Sub- Saharan Africa. The productivity of wheat has increased in the last few years in the country, but low as compared to other countries. This low productivity is attributed to a number of factors including biotic, abiotic, shortage of high yielding and stable varieties. The objective of the present study is to identify high yielding and stable genotype. A total of twenty genotypes including Dambal (st. check) and Mada walabu (Local check) were evaluated for two cropping season 2017 and 2018 at four locations: Sinana, Agarfa, Goba and Gololcha. The experiment was laid out in RCBD with three replications. The result of combined analysis of variance showed high significant differences for genotypes, environment and GE interaction. The result of AMMI analysis indicated that 36.3 %, of the total variability was justified by environment, 28.6% by genotypes and 34.9% by GE interaction whereas IPCA 1 and IPCA 2 explained 74.2% from the total GE. Based on GSI a single criteria for stability and high grain yield, genotypes G9, G1, G14,G10, G15 and G12 have the smallest genotype stability index which means they were stable and high yielding genotype. The best genotype with respect to environment Gololcha 2017 and Gololcha 2018 was genotype G10. Genotypes G3 and G17 were better adapted to environments Agarfa 2017. G12 is high yielder stable across tested locations. Therefore this genotype was identified as candidate genotypes to be verified for possible release.