Abstract
This study evaluated the agronomic performance of six segregating populations of black bean (BRS Supremo x CHP 97-01, BRS Supremo x CHP 97-04, BRS Supremo x CHP 97-05-16, BRS Supremo x CHP 97-26, BRS Supremo x IPR Grauna and BRS Supremo x Uirapuru IPR) in the F3 generation, conducted by the bulk method. Populations and parents were evaluated in the 2007/08 growing season in a randomized block design with four replications. Results show promising traits of the segregating population BRS Supremo x CHP 97-04, which was superior to parent BRS Supremo, indicating the line for further selection. The segregating populations and their parents were grouped by Ward's method, indicating the similarity of the selected lines.
Highlights
A major challenge in common bean (Phaseolus vulgaris L.) breeding is the development of high-yielding cultivars, adapted to various climatic conditions, with desirable technological characteristics for farmers and consumers
The results revealed significant differences between treatments for plant height, number of grains per plant and 500-grain weight (Table 1)
One analysis technique is based on the use of contrasts, for cases where the researcher is interested in testing specific effects of the experiment, by planned comparisons (Corrente et al 2001)
Summary
A major challenge in common bean (Phaseolus vulgaris L.) breeding is the development of high-yielding cultivars, adapted to various climatic conditions, with desirable technological characteristics for farmers and consumers. The mean squares corresponding to the previously established contrasts between parents and F3 segregating populations for the traits number of pods per plant and grain yield showed significance in some contrasts, not detected by the global analysis of variance (Table 2).
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