USING OF BIPLOT TECHN-IQUE FOR STUDYING OF G x E INTERACTION FOR PEANUT POD YIELD

Abstract

Yield data of seven peanut genotypes across four Iraqi environments have been analyzed during 2002 season using the GGE-Biplot technique. The Goals of this study were :(1) Specification the Ideal or favorable genotype(s) and environment(s) in term of high yield and stability ;(2) Definition the superior genotype for each environment; (3) Estimation the value of G.E. interaction. The results showed that variance of G and G.E. interpreted 31% and 22.9% of the total variation respectively. The first two principal components (PC1 &PC2) were sufficient to interpret G.E. interaction, where they explained 87% of GGE sum of square. The stable genotypes had PC2about zero and the genotypes that had PC1 scores>0 considered high- yielding genotypes and. C97 genotype was favorable one in term of high yields and stability, while the genotype C92 was stable but poor. On the other hand, all the tested environments had PC1 scores>0, and that suggests non-crossover type for the studied environments. Al-Kut environment was the desirable one because of its ability to discriminate the genotypes and representation the rest environments.