Genotype by Environment Interaction and Stability Analysis in Ethiopian Mustard (Brassica Carinata A Braun) Using AMMI Biplot and Stability Parameters

Abstract

The objective of this study was to evaluate genotype by environment interaction and yield stability in multi environmental locations in Ethiopia. Ten Ethiopian mustard genotypes along with one local check and one standard check were evaluated for seed yield at four locations namely, Holeta, Debrezeit, Asasa and Arsi Negelle during the growing season of 2020/2021. The experimental design was randomized complete block design with four replication. Analysis of variance, Ammi biplot and stability parameters were applied for evaluation of genotype by environment interaction and stability. The analysis of variance showed significant differences (P<0.05) among genotypes, locations and GXE interaction for yield. One of the most widely used models to analyses genotype-by-environment data is the additive main effects and multiplicative interaction (AMMI) model. The AMMI1 biplot showed that genotypes G7, G5, and G8 are less affected by the interaction of genotypes and environmental changes and genotypes G1, G7, G8 and G11 are stable genotypes across locations. The AMMI2 biplot indicates that environments E4 and E3 do not exerted strong interaction forces, while strong interactions forces was observed for E1 and E2. AMMI2 also revealed that genotypes G6, G10, G7, G2, G1 and G5 are less affected by the environmental change whereas the remains are more responsive to environmental change.