Additive main effects and multiplicative interactions analysis of paddy yield performance of rice cultivars across locations under the influence of Rice yellow mottle Sobemovirus

Abstract

This study was carried out under the paddy yield performance of 14 cultivars resistance to Rice yellow mottle sobemovirus (RYMV) across two locations in northern Nigeria in 2005/2006 planting season. The experimental layout was randomized complete block design with three replications. Additive main effects and multiplicative interactions (AMMI) analysis indicated that the paddy yield of the cultivars (genotypes) was under major location (environmental) influence and cultivar x environmental interactions. The first principal component (PCA 1) was significant (P<0.05) while second principal component (PCA 2) was not significant (P>0.05) and it had a cumulative contribution of 80 % to the total variance in paddy yield performance by environmental interactions. Genotype and environmental interaction was also significant (P<0.05). A biplot using cultivar means and environment scores of the first 2 AMMI components showed that cultivars with larger PCA 1 and lower PCA 2 score gave higher yield value (stable cultivar). FARO 37 (G9) was found to be the most stable cultivar and cultivar with lower PCA 1 and larger PCA 2 scores had low paddy yield (unstable cultivar that is G6) with respect to the locations.