Analysisof G.E. Interaction based on gge-biplot technique for some genotypes of sunflower

Abstract

Yield data of six sunflower genotypes tested across four Iraqi environments during 2007 and 2008 growing season were analyzed using the GGE-biplot method. Aims of this study were :(1)Analyze G.E.I. for six sunflower genotypes across four Iraqi environments by GGE-Biplot, (2) definition superior genotypes that could be valuable for sunflower improvement or variety release, (3) specification the suitable genotype for each environment, (4) determination the ideal and favorable genotypesin terms of high yield and stability,(5) Demonstration the GGE biplot which is used for the first time in Iraq. The G and G.E. interpreted 71.2% and 11.9% of the total respectively. The first two principal ( PC1& PC2) components were sufficient to interpret G.E.I that explained 85.7% and 11.4% of GGE sum of square respectively. The adaptable and / or higher- yielding genotypes had PC1 scores˃ 0, and PC1 ˂ 0 scores defined the non-adaptable and / or lower-yielding ones. The genotypes which had PC2 scores near zero identified as a stable, while absolute larger PC2 scores detected the unstable ones. Shimows was the ideal genotype in terms of higher yielding ability and stability, while the genotypes Cuban and Youroflore were stable but poor. On the other hand, all tested environments had PC1 scores>0 and that suggest non-crossovertype G.E.I. The Kut2 and Dywanya were the desirable environments.