Analysis of Grain Yield Stability in Hexaploid Wheat Genotypes Grown in Temperate Regions of Iran Using Additive Main Effects and Multiplicative Interaction

Eighteen wheat breeding lines were evaluated along with two check cultivars acrossnine locations of temperate zone of iran during two crop seasons (2003-2004 and 2004-2005). field records were taken for some important traits especially grain yield.combined anova for nine locations in the first season and for seven locations in bothseasons was undertaken. in each case, additive main effects and multiplicative interactionanalysis (ammi) was employed and the biplot of the interaction principal components(ipc) were evaluated for stability and adaptation relationships among genotypes andlocations. ipc1, ipc2 and ipc3 accumulatively defining 78.4% of genotype×environment(g×e) interaction variation were found out as significant in the first crop season. biplot offirst two ipcs identified at least two sub-regions among the locations. some genotypes(m-82-7 and m-82-17) showed specific adaptation toward one of the drought-prone subregions.for the combined data of both seasons, only ipc1 was significant defining 41.5%of g×e interaction variation. thus, plot of ipc1 along with grain yield means wereemployed for an interpretation of adaptation relationships. entries m-82-8, m-82-9, m-82-11 and m-82-15 showed specific adaptation to mashhad station which was interactiveand particular in behavior. the results indicated that ammi is an informative method ofstability and adaptation analysis to be employed in practical plant breeding andsubsequent variety recommendations.