Principal Coordinates Analysis of Yield Stability Performances of Grain Yield in Durum Wheat Genotypes

Twenty genotypes of durum wheat were evaluated in five different test locations over three growing seasons and analyzed for stability of yield performance. The combined analysis of variance revealed the presence of significant genotype × environment (GE) interaction for grain yield. The GE interaction was examined using multivariate analysis technique as principal coordinate analysis (PCOA). According to grand means of test environments and total mean yield (2504 kg ha^-1), test environments are grouped to low (seven environments) and high (eight environments) mean yield. Considering scatter point diagrams, plot of minimum spanning tree and values of centroid distances, genotypes G13 with 2592 kg ha^-1 (mean rank=2), and G15 with 2575 kg ha^-1 (mean rank=7), were identified for unfavorable or poor environmental conditions while genotypes G9 with 2566 kg ha^-1 (mean rank=8), and G14 with 2694 kg ha^-1 (mean rank=1), were identified for favorable environments.