Stability Analysis of Durum Wheat (Triticum Durum Desf) Genotypes by Regression Measurement In Ethiopia

Abstract

In this study, 13 advanced lines with 4 standard and a local check of Durum wheat (Triticum turgidum var. durum Desf.) were evaluated for two consecutive cropping seasons (2014-2015) at six research stations for grain yield in Ethiopia. The combined analysis of variance indicated that the main effects of location and genotype and interaction effects of genotype × year, genotype × location and genotype × year × location were highly significant for grain yield. GE interaction was analyzed using linear regression techniques. There was a considerable variation in grain yield among genotypes and environments. Stability was estimated using the Eberhart and Russell method. Stability analysis of grain yield in deferent environments showed that the variance of genotypes and genotypes × environment interactions were significant. Due to the stability analysis, Genotypes 2, 3, 4 and 15 have b value close to one, i.e. genotypes are responsive to good environments, and it may be considered stable for grain yield in all of the environments. The deviation from regression for G7, G9, G10 and G11 are also low and because of the low value of the genotypic mean, these genotypes are intermediate stable and poorly adapted to all environments. None of the genotypes evaluated was perfectly stable in all of the environments due to lack of b- the value equal to unity. The broad sense heritability was 69.2%, indicating selection should give a good response for grain yield.