Herencia de una nueva fuente de resistencia al virus del mosaico dorado amarillo de la habichuela (Phaseolus vulgaris L.) (Spanish text)

Bean Golden Yellow Mosaic (BGYMV), caused by a whitefly (Bemisia spp.) transmitted geminivirus, is an important disease that limits bean (Phaseolus vulgaris L.) production in Central America, the Caribbean and Florida. Increasing genetic resistance through plant breeding is an effective way to control this disease. Because the genetic base of BGYMV resistance of bean cultivars is narrow, it would be desirable to identify new sources of resistance to the virus. Accessions of Phaseolus coccineus are resistant to BGYMV. An interspecific cross between P. vulgaris and P. coccineus was evaluated and used to study the inheritance and to identify a molecular marker linked to this new source of resistance. Segregation patterns of F₂ plants suggest that BGYMV resistance from P. coccineus is controlled by two genes. A recessive gene, with the proposed symbol bgm-3, controls leaf mosaic and a dominant gene, with the proposed name Bgp-2, controls pod deformation. A group of 680 10 bp RAPD primers was evaluated in an attempt to identify a molecular marker. None of the primers, however, were linked to the resistance. The new genes can be used in breeding programs to increase resistance to BGYMV.