Yield and resistance to pathogens of carioca type bean populations / Desempenho produtivo e resistência a patógenos em populações de feijão do tipo carioca

AUTOR(ES)

Gilmar Silvério da Rocha

DATA DE PUBLICAÇÃO

2008

RESUMO

The main objective of this work was to evaluate the genetic potential of five segregating carioca type bean populations, originated from crossings involving the elite lines UTF-0013, CNFC 9437, OPS-82, Carioca 1070 and GEN 12-2 and the isoline Rudá-R, used as source of resistance to anthracnosis, rust, and angular leaf spot. The families evaluated were derived from F4 plants, previously selected using SCAR molecular markers associated to genes of resistance to anthracnosis and angular leaf spot. Initially, 215 F4:6 families (2006 winter) and 10 checks were evaluated using the triple square lattice. In the following generations (F4:7 - 2007 February to May and F4:8 - 2007 winter), 18 families per population and 10 checks were evaluated also in lattice. The experiments were conducted at the experimental area of the Universidade Federal de Viçosa, Department of Plant Science, in Coimbra-MG. Yield and grain aspect were evaluated in all the experiments. Plant architecture was evaluated in the last two crops and rust severity only in the first. Individual and compound analyses of variance were carried out for all the characters evaluated. Based on the molecular information of the F4 plants that originated the families and on their evaluation, 36 promising families were separated for selection of superior lines. Out of these, 26 were inoculated with the races 65 and 453 of Colletotrichum lindemuthianum. The population CNFC 9437 x Rudá-R was also inoculated with the race 63.23 of Pseudocercospora griseola. Eighteen families were found resistant to both races of C. lindemuthianum. It means that they have the alleles Co-4 and Co-10 and/or Co-6 or their combinations. The resistance to 63.23 of P. griseola of families of the population CNFC 9437 x Rudá-R indicated that the introgression of the allele Phg-1 was performed successfully and that the SCARH13520a marker- assisted selection was highly efficient.

ASSUNTO(S)

scar markers produtividade de grãos marcadores scar phaseolus vulgaris melhoramento vegetal phaseolus vulgaris grain yield

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