Genotype x Environment Interaction for Yield in Field Pea (<i>Pisum sativum</i> L.)

Abstract

The performance of a given genotype depends on its genetic potential and the environment upon which it is grown. In this study, sixteen genotypes of field pea (Pisum sativum L.) were tested over locations (Shambu and Arjo) for three years (2000-2002) and at Gedo (2002) with the objectives of identifying high yielding, stable and adaptable varieties for the Western highlands of Ethiopia. Regression and additive main and multiplication interaction (AMMI) analysis were computed to identify stable genotypes across multienvironments (location-year combinations). Analysis of variance revealed highly significant difference among genotype and genotype x environment (G x E) interactions, implying that genotypes suitable for specific environments can be selected. Regression and AMMI analysis were employed in order to determine the stability of genotypes. The two models regression analysis and AMMI revealed similar result in that Bariso, EH92049-1-2-1 and EH92049-2-2 were stable and widely adapted genotypes. However, the genotypes EH92049-1-3-1 and EH92039-1 are sensitive to changes in environmental conditions. Bariso was the most stable and high yielding genotype and was therefore released for the western Ethiopian highlands and other areas with similar agroecologies.

Keywords: AMMI; Genotype x Environment; Pisum sativum; Regression; Stable