Existing bean variability and breeding activities at CIAT for new genetic combinations

Tohme, Joseph M.

Existing bean variability and breeding activities at CIAT for new genetic combinations

Autores

Editor

Southern Africa Development Coordination Conference (SADCC)
Centro Internacional de Agricultura Tropical (CIAT), Regional Programme on Beans in Southern Africa

Descripción

Assembled germplasm has provided breeders with valuable traits for the improvement of common beans. Molecular markers such as phaseolin and isozymes have facilitated understanding of the genus Phaseolus thus enabling breeders to develop more effective strategies. However, there are still gaps in the collections that have been assembled and in available information. Strategies for conservation need to be coordinated among international and national programs to prevent further genetic erosion of collected germplasm. Duplication of germplasm collections is vital. New sources of genetic variability not present in existing cultivars have been identified and transferred to adapted backgrounds. Wild accessions of P. vulgaris have provided genetic variability and sources of resistance not yet found in cultivated beans. At CIAT, the diversification of sources of resistance to several diseases and insects is well advanced. Broad and stable resistance is being sought. These new resistant sources are deployed through international nurseries which also serve to monitor pathogen variability. (AS)

Palabras clave

phaseolus vulgaris, plant breeding, germplasm, genetic variation, gene pools, cultivars, selection, resistance, xanthomonas campestris phaseoli, colletotrichum lindemuthianum, bean common mosaic virus, ophiomyia, zabrotes subfasciatus, empoasca, ascochyta, bacterial diseases, coleoptera, diseases and pathogens, injurious insects, mycoses, noxious animals, pests, viroses, fitomejoramiento, germoplasma, variacion genetica, reservas geneticas, variedades, selección, resistencia, virus del mosaico común frijol