Genotype x environment interaction in the grain yield of lines and cultivars in common bean - DOI: 10.4025/actasciagron.v31i4.850

Abstract

The objective of this work was to evaluate the effects of the genotype x environment interaction in the grain yield in lines and cultivars of common bean, as well as to give directions for breeding programs to develop superior cultivars. During the 2005/2006 agricultural year, an assay was conducted in the wet and dry cropping seasons, at three IAPAR Experimental Stations, totaling six environments. Complete randomized blocks, with 20 genotypes and three replications were used. Each plot had two lines of 5 m, 0.5 m between rows, and 15 plants m-1. Number of days to flowering and physiological maturity of the grains and grain yield were assessed. The individual and combined analyses of variance indicated significant differences among genotypes, environments and for the G x A interaction, at 1 and 5% levels of probability, revealing that the evaluated genotypes performed differently according to the environment in which the tests were performed. The following lines were selected: LPSIA04-103, LPSIA04-104 LPSIA04-106 and LPSIA04-108. All lines showed precocity (shorter number of days to flowering and physiological maturity of the grains), high grain yield and wide adaptability.