Comparison of three methods used for the study of adaptation and phenotypic stability in the common bean (Phaseolus vulgaris L.).

DUARTE, J. B.; ZIMMERMANN, M. J. de O.

Comparison of three methods used for the study of adaptation and phenotypic stability in the common bean (Phaseolus vulgaris L.).

Autores

Descripción

The objective of lhe present work was to compare lhe acuity of three different rnethods of studying phenotypic stability for determining lhe variability in average yield data of lhe common bean. Data from twelve prelirninary yield trials of 76 common bean genotypes grown in eight Brazilian locations were used. Two classical procedures based on linear regression analysis and lhe recent proposition of bisegmented linear regression were studied. Based on lhe proportion of estimates of coefficients of-determínatíon that were statistically significant or non significant for lhe genotypes studied, as well as on lhe magnitude of such estimates, it was concluded that lhe segmented linear regression procedure was slightly superior to lhe methods based on linear regression analysis. The two methods oflinear regression showed similar results. The advantage of lhe bisegmented linear regression method was more evident when lhe behaviour of lhe genotypes in response to lhe environrnental variation did not follow linearity.