O objetivo deste trabalho foi verificar o efeito de ambientes na predição do potencial genético de populações de feijoeiro quanto ao diâmetro do hipocótilo e produtividade de grãos. Foram avaliadas 48 populações segregantes de feijão nas safras de inverno de 2009 (gerações F2 e F3 simultaneamente) e seca de 2010 (gerações F3 e F4 simultaneamente), além de 16 testemunhas. A predição do potencial genético das populações foi feita utilizando a metodologia de Jinks e Pooni. Verificou-se baixa coincidência entre as melhores e entre as piores populações nas duas safras e nas diferentes gerações para os dois caracteres, evidenciando que o efeito de ambientes interfere na escolha das populações de feijoeiro, quando se utiliza o método de Jinks e Pooni. Assim, é recomendável que a predição do potencial seja realizada com base nas informações de um maior número de ambientes.

The objective of this study was to investigate the effect of environments on the estimated genetic potential of common bean populations for the traits hypocotyl diameter and grain yield. We evaluated 48 segregating bean populations in the growing seasons winter 2009 (F2 and F3 simultaneously) and drought 2010 (F3 and F4 generations simultaneously), and 16 controls. The genetic potential of the population was estimated using the methodology of Jinks and Pooni. The coincidence between the best and worst populations in the two growing seasons and different generations for the two characters was low, indicating that the environmental effect interferes with the selection of common bean populations when using the method of Jinks and Pooni. Thus, it is recommended that the genetic potential should be estimated based on the evaluation of a larger number of environments.

In common bean (Phaseolus vulgaris L.) breeding, plant selection that associate erect plant architecture, high yield, and grains with good commercial acceptance has been the choice of breeders. Thus, this study aimed to evaluate potential parents, to obtain promising segregating populations that associate high yield, erect plant architecture and carioca grain type, as well as to obtain information on heterosis, general and specific combining ability of these parents regarding grain yield and traits related to plant architecture. Fourteen common bean lines were crossed under a partial diallel scheme. Group 1 was composed by eight erect plant lines and group 2 by six carioca grain type lines. The F1's plants from the crosses and the 14 parents were evaluated during spring (Mar. sowing) for plant architecture grade, diameter of the hipocotyl, plant mean height, and grain yield. Predominance of additive effects was observed for plant architecture grade and diameter of the hypocotyls. For grain yield and plant mean height, there was a greater contribution of the dominance effects. Thus, selection of erect plants, with a larger diameter of the hypocotyl can be carried out in early generations; while for grain yield and plant mean height, it must be delayed, preferably, to later generations.

Este trabalho foi realizado com os objetivos de estimar o progresso genético após dois ciclos de seleção recorrente no melhoramento de feijão vermelho e obter novas linhagens. No ciclo zero foram avaliadas famílias F3:5 e F3:6. No ciclo um as famílias foram extraídas na geração F5 e avaliadas nas gerações F5:6 e F5:7. Como as famílias foram avaliadas em anos e gerações diferentes, a estimativa do progresso genético foi obtida avaliando simultaneamente as 30 melhores linhagens obtidas no final de cada ciclo, em experimentos conduzidos por três safras. Após dois ciclos de seleção recorrente, o progresso genético, na média das safras, foi de 7,5% para produtividade de grãos, 7% para aspecto de grãos, 33,4% para resistência a ferrugem e 13,2% para resistência a mancha angular. Foram obtidas linhagens de feijão vermelho com potencial para serem incluídas em futuros ensaios de Valor de Cultivo e Uso (VCU) para Minas Gerais, Brasil.

This study was carried out for the purpose of estimating genetic progress after two cycles of recurrent selection in red bean breeding and of obtaining new lines. In cycle zero, F3:5 and F3:6 families were evaluated. In cycle one, the families were extracted in generation F5 and evaluated in generations F5:6 and F5:7. As the families were evaluated in different years and generations, the estimate of genetic progress was obtained by simultaneously evaluating the 30 best lines obtained at the end of each cycle in experiments conducted through three crop seasons. After two cycles of recurrent selection, genetic progress, in the mean value of the crop seasons, was 7.5% for grain yield, 7% for grain appearance, 33.4% for resistance to rust and 13.2% for resistance to angular leaf spot. Lines of red beans were obtained with potential for being included in future Value for Cultivation and Use (VCU) testing for Minas Gerais, Brazil.

Este trabalho foi realizado com o objetivo de avaliar o potencial de linhagens de feijão vermelho, oriundas de populações do primeiro ciclo de seleção recorrente do programa de melhoramento do feijoeiro da Universidade Federal de Viçosa. Foram avaliadas 243 famílias, provenientes de 18 populações segregantes, nas gerações F3:5, F3:6 e F3:7. Essas famílias foram conduzidas pelo método do "bulk dentro de famílias" e daquelas com maior potencial, foram extraídas 154 linhagens, avaliadas nas safras da seca de 2006 (F7:9) e seca de 2007 (F7:10), em Coimbra - MG. As estimativas dos parâmetros genéticos e fenotípicos evidenciaram a presença de variabilidade entre as famílias. O método do "bulk dentro de famílias" derivadas de plantas F3 mostrou-se promissorcomo estratégia de melhoramento do feijoeiro. Linhagens com maior potencial para inclusão nos futuros ensaios de valor de cultivo e uso (VCU) para Minas Gerais foram extraídas das populações Vermelhinho/AN9022180//Vermelhinho/ Vermelho2157,Vermelhinho//Vermelhinho/IAPAR81,Vermelhi-nho/LR720982//Vermelhinho/AB136 e Vermelhinho/AB136// Vermelhinho/Vermelho2157.

The purpose of this study was to evaluate the performance potential of red bean lines, derived from populations of the first cycle of recurrent selection in the common bean breeding program of the Federal University of Viçosa, Minas Gerais. In the F3:5, F3:6 and F3:7 generations, 243 families from 18 segregating populations were evaluated. These families were conducted by the bulk-within-families method and from the best, 154 lines were obtained and evaluated in the dry season of 2006 (F7: 9) and of 2007 (F7: 10), Coimbra - MG. The estimates of genetic and phenotypic parameters revealed variability among families. The method bulk within F3-derived families proved useful for bean breeding. The most promising lines that may be included in future tests of value for cultivation and use (VCU), and will possibly be recommended for planting in the state of Minas Gerais, were derived from the populations Vermelhinho/AN9022180//Vermelhinho/Vermelho2157, Vermelhinho//Vermelhinho/ IAPAR81,Vermelhinho/LR720982// Vermelhinho/AB136 and Vermelhinho/AB136//Vermelhinho/ Vermelho2157.