Genotype x Environment Interaction and Stability Analysis for Grain Yield of Advanced Tef Genotypes using GGE Biplots

Abstract

Selection of the most high-yielding and stable cultivars across environments are difficult because of the complex nature of genotype × environment interactions (G x E interaction). The study was conducted with the objectives to determine the G x E interaction of tef genotypes and to identify tef genotypes with high stability for grain yield using GGE biplot analysis. In the present study, 12 advanced tef genotypes and one standard check were evaluated at Holetta and Ginchi in 2014 and 2015 and at Adadi in 2014. Combined analysis of variance revealed the existence of significant G x E interaction for tef grain yield. Genotype, environment and G x E interaction explained 6.70 %, 81.03 % and 12.27 % of the variation in grain yield, respectively.  The GGE model showed that the first and second principal component axis accounted for 43.2 % and 29.5 % of variability, respectively. The pattern of G x E interaction was a crossover type as revealed by differential yield ranking of the genotypes across environments. Genotype G4 (RIL- 77C)  was both high yielding and stable across the test environments and could be considered as desirable genotype recommended for release as variety. The test environment E3 (Adadi-2014) was identified to be the most discriminating and representative environment to evaluate tef genotypes.

Keywords: Tef, GGE biplot, stability, genotype x environment interaction.

DOI: 10.7176/JBAH/10-21-05

Publication date: November 30^th 2020