Stability analysis for forage yield in sorghum lines

The objectives of this study were to analyze genotype by environment(GE) interactions on the forage yield of 15 sorghum lines by the additive main effects and multiplicative interaction(AMMI) model and to evaluate genotype(G), environment(E) and GE interactions using stability parameter i.e., AMMI stability value(ASV) and Wrick, s ecovalance (W2 i). The trials were conducted at two research station(Neyshabur and Torogh Mashhad) for three successive years2007-2009(). The result’s of AMMI analysis for forage yield indicated that the Genotype main effects, environment, and GE interactions as well as two first interaction principal components (IPCA1-2) were significant. AMMI biplot was able to distinguish stable genotypes and environments with high and low genotype discrimination ability. The genotypes 5 and 15 with higher mean yield than total mean were to be most stable genotypes, while the genotype 1 and 3 with the highest contribution to GE interaction, were to be the most instable. The result of recommended genotypes based on AMMI analysis showed that the genotypes 1 and 3 were highly adapted to Neyshabur and genotypes 5 and 15 were adapted to Mashhad environments during this study.