Genotype x environment interaction and yield stability in Field pea (pisum sativum L.) tested over different locations in Southern Ethiopia

Abstract

Twenty-four field pea (pisum sativum L.) genotypes were evaluated for genotype x environment interaction (GEI) and yield stability across five locations in 2006/2007. ANOVA test showed the main effects due to genotype, locations and the genotype x location were highly significant for grain yield and other yield related traits. Highly significant (P<0.01) to significant (P<0.05) rank correlation were found among stability parameters such as ecovalence (Wi); deviation from regression (S2d i) and AMMI stability value (ASV) implying their close resemblance and effectiveness in identifying stable genotypes. As a result, these relationships reveal that one of them could be sufficient to select genotypes of interest in a field pea. On the basis of results, field pea genotype ‘IG-51980’ in a pipe line was the most suitable and desirable genotype which showed stable yields and was recommended for commercial cultivation in south  Ethiopia ,whereas the highest yielding genotype Gume was not stable.

Keywords: Field pea, genotype x environment interaction, stability parameters, yield