Abstract
Plant with a more upright architecture offers many advantages to farmers. Recurrent mass selection (RS) programs for carioca type common bean have been implemented for the purpose of obtaining new lines that will generate the high yields that are associated with upright plant archi tecture. This study aimed to assess the efficiency of recurrent mass selection (RS) for upright plant architecture in common bean (Phaseolus vulgaris) and the effect of RS on grain yield and to verify whether or not there is still variability in the population that favors continuing selection programs, using information obtained from progenies evaluated in cycle five (CV) and cycle eight (CVIII) of the RS program. Mass selection for more upright plants was performed visually in the "S0" generation before flowering. Progenies S and Swere evaluated in 2009 (CV) and 2011 (CVIII). Heritability (h²;) and RS progress were estimated using adjusted means. After eight selection cycles, the population subjected to RS still had enough genetic variability to achieve continued success through recurrent selection. The RS progress was 1.62 % per cycle for the growth habit scores and 6.81 % for grain yiel.
Highlights
The demand for new cultivars that combine greater grain yield within commercial standards is growing, especially in the case of the carioca type bean (Phaseolus vulgaris) and more upright plant architecture
Recurrent mass selection (RS) programs for carioca type common bean have been implemented for the purpose of obtaining new lines that will generate the high yields that are associated with upright plant architecture
This study aimed to assess the efficiency of recurrent mass selection (RS) for upright plant architecture in common bean (Phaseolus vulgaris) and the effect of RS on grain yield and to verify whether or not there is still variability in the population that favors continuing selection programs, using information obtained from progenies evaluated in cycle five (CV) and cycle eight (CVIII) of the RS program
Summary
The demand for new cultivars that combine greater grain yield within commercial standards is growing, especially in the case of the carioca type bean (Phaseolus vulgaris) (beige with brown stripes) and more upright plant architecture. For breeders to obtain lines that combine upright plants with high commercial grain yield the greatest difficulty is the large number of genes involved in the controling of these traits and the effect on the environment when these traits find expression (Kelly and Adams, 1987). For this reason, the probability of obtaining success in any one single selection cycle is low. The principal alternative available is the use of recurrent selection (Hallauer et al, 2010)
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