Avaliação de progênies precoces de feijoeiro oriundas de cinco ciclos de seleção recorrente.

O objetivo do trabalho foi a avaliação de progênies, oriundas de cinco ciclos de seleção recorrente para florescimento precoce, visando selecionar progênies que apresentem florescimento precoce, aliadas à demais características de interesse aos melhoristas

Estimativas de parâmetros de compensação e de estabilidade entre linhagens de feijoeiro visando a obtenção de multilinhas.

Foi realizado o presente trabalho visando à obtenção de estimativas da capacidade de compensação de linhagens de feijão, bem como verificar se misturas das linhagens possuem maior estabilidade que as suas linhagens componentes

Como obter sucesso na cultura do feijoeiro no Estado de Minas Gerais.

Tem por finalidade difundir uma nova cultivar de feijão, a 'BRSMG Talismã', recomendada para o Estado de Minas Gerais, e fornecer sugestões de tecnologias que certamente deverão contribuir para o aumento da produtividade.bitstream/CNPAF/19513/1/circ_50.pd

Ganho com sete ciclos de seleção recorrente na cultura do feijoeiro para resistência à mancha angular e produtividade de grãos.

O presente trabalho teve por objetivo estimar o progresso genético obtido com os sete primeiros ciclos desse programa para a resistência à mancha angular e produtividade de grãos.CONAFE

Allele frequency and selection efficiency in cross populations of Andean x Mesoamerican common beans (Phaseolus vulgaris L. Fabales, Fabaceae).

Strategies were investigated for improving efficiency in the use of segregating common bean (Phaseolus vulgaris) populations using crosses between the Andean cultivar BRS-Radiante and the Mesoamerican parent cultivar Carioca-MG by developing populations with 12.5%, 25%, 50%, 75% and 87.5% of the allele frequency of one of the parents. For each of the five populations we evaluated for two traits, the number of days to the beginning of flowering and grain yield (g plot -1), in the F2:3 (sown in February 2006) and F2:4 (sown in July 2006) generation progenies using 15 x 15 lattice design experiments, with 44 progenies (n = 220 plants) plus the two parents and three controls being evaluated for each generation. In terms of variability release, the populations with different parental allele frequencies presented no consistent tendency of alteration. In general, genetic variance was stated among progenies in all populations, indicating success with selection. For grain yield, the lowest mean was observed in the populations with 50% of the alleles of both parents. If, for instance, the objective is to develop earlier flowering lines, the best strategy is to perform two, or at least one, backcross with the earliest parent. The most suitable allele frequency is to be determined according to the desired grain type

Phenotypic recurrent selection in the common bean ( Phaseolus vulgaris L) with carioca-type grains for resistance to the fungi Phaeoisariopsis griseola.

The efficiency of recurrent selection was assessed in obtaining common bean (Phaseolus vulgaris L) plant lines resistant to the phytopathogenic fungi Phaeoisariopsis griseola. The base bean population was obtained from the partial diallel between seven lines with carioca-type grains and 10 sources of resistance to P. griseola. The plants most resistant to the pathogen were selected in the F2 (S0) generation of the populations (C-0). The best S0:1 plants that presented carioca-type grains were intercrossed to obtain cycle I (C-I). The same procedure was adopted to obtain cycles C-II to C-V. In each recurrent selection cycle, S0:1 progenies selected were also assessed in experiments carried out in Lavras, Brazil, always using as check the Carioca MG (susceptible to P. griseola) and Pérola (tolerant) cultivars. The response to selection for resistance to the pathogen was estimated from the general mean of the S0:1 progenies from each selective cycle compared to the susceptible check Carioca MG. The estimated gain was 6.4% per cycle and the indirect response in grain yield by selection for resistance to the pathogen was 8.9% per cycle. The variability detected among the progenies in the last selective cycles enabled the prediction of additional responses to recurrent selection

Índice de seleção na escolha de populações segregantes de feijoeiro.

O objetivo do trabalho foi verificar a viabilidade de um índice de seleção, obtido a partir do somatório das variáveis padronizadas, na avaliação da capacidade de combinação de genitores

Estimates of compensation and stability parameters in common bean lines aiming at multilines.

This study aimed to determine parameter estimates of compensation of common bean lines and verify if the stability of a mixture of lines is higher than of the line components. Six common bean lines were evaluated, pairwise, in equal proportions. The experiments were conducted in 11 environments, where the trait seed yield was evaluated (grams per plot). The positive ci estimate (compensation ability of line i) of cultivar Talismã was highest, indicating the line for mixtures. The combination of the pair Carioca and MA-II-16, with the highest positive sij estimate (specific compensation ability for the pair of lines i and j), was satisfactory. It was observed that the mean contribution of mixtures to the interaction was in the mean lower than of lines in monoculture. The stability was highest in the mixture Talismã and MA-II-8 and the risk of adoption lowest. The estimates of these compensation and stability parameters in mixtures underlying additional information are a support in the choice of lines to compose a multiline

Cultivares de feijoeiro comum para o Estado de MInas Gerais.

As novas cultivares de feijoeiro comum recomendadas para cultivo em Minas Gerais vêm proporcionar aos agricultores várias opções quanto ao tipo de grão, resistência à doenças, porte da planta e precocidade, entre outras características. A escolha deve recair sobre aquela que melhor atenda às necessidades, condições de cultivo e oportunidade de comercialização.bitstream/CNPAF/22245/1/circ_65.pd

Avaliação de linhagens de feijoeiro de um programa de seleção recorrente quanto à reação a raça 63-31 de Pseudocercospora griseola.

O objetivo deste trabalho foi avaliar 35 linhagens de feijoeiro oriundas dos sete primeiros ciclos desse programa de seleção recorrente quanto à reação à raça 63-31 de P. griseola, em condições controladas.CONAFE