Genotype-environment interaction and stability analysis for seed yield of Fenugreek (Trigonella foenum-graecum L.) genotypes
Yield data of 12 Fenugreek (Trigonella foenum-graecum L.) genotypes tested across 9 rain-fed environments during the 2015-2017 growing season using RCBD in 3 replications were analyzed using the AMMI model. The AMMI analysis tested in nine environments (years) were showed that the yield was significantly affected (P<0.001) by environment main effects. However, it was not significantly affected by genotypes main effect as well as GxE interaction. The model revealed that differences between the environments accounted for about 91.28% of the treatment sum of squares. The genotypes and the GxE interaction also accounted significantly for 0.92 % and 7.79% respectively of the treatment SS. The first principal component axis (PCA 1) of the interaction captured 48.61% of the interaction sum of squares. Similarly, the second principal component axis (PCA2) explained a further 24 % of the GEI sum of squares. The mean squares for the PCA 1 and PCA 2 were significant at P=0.01 and cumulatively contributed to 72.61% of the GxE interaction SS, leaving 27.44% of the variation in the GxE interaction in the residual. The AMMI and AMMI stability value (ASV) identified G7 and G5 as the stable and high yielding genotypes.
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