Abstract

SILVA DIAZ, Rubén J et al. Phenotypic stability of maize hybrids in Venezuela using the index of superiority and the bilinear regression. Agronomía Trop. [online]. 2014, vol.64, n.1-2, pp.107-120. ISSN 0002-192X.

The phenotypic stability analysis provides detailed information on the behavior of each genotype against environmental variations, in this sense, the objective of this research was to detect the presence of genotype by environment interaction as well as to know the adaptability and phenotypic stability of eighteen maize hybrids (Zea mays L.), by using the models index of superiority and bilinear regression. Twelve experimental hybrids and six commercial controls were planted in seven locations of Venezuela, during 2012 rainy season, in a randomized complete block design with three replications. The trait of interest was grain yield (t ha^-1). Combined analyses of variance showed that hybrids performance were inconsistent because of environmental variations. With the model of index of superiority the hybrids 'DK 1596' and 'Exp A-1' were identifi ed as stable, while the model of bilinear regression allowed to identify the hybrids: 'Exp A-1', 'Exp A-2', 'Exp A-3', 'Exp A -5', 'Exp B-1', 'Exp B-4', 'Pioneer 30F35' and 'DK-370' as stable. With both models the hybrid Exp A-1 was identifi ed as stable whereas Exp B-4 as adaptable to favorable conditions. The model of bilinear regression was more discriminatory than the index of superiority; therefore, the fi rst one was more effi cient and suitable for the analysis of both adaptability and stability. The hybrids Exp A-1 and Exp B-4 showed a good productive performance in the different localities of evaluation, which should be considered for their release as commercial cultivars.

Keywords : Zea mays L.; genotype by environment interaction; predictability; stability; adaptability.

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