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Black bean (Phaseolus vulgaris L.) production in the lowlands of Mexico, Central America and the Caribbean is threatened by viral diseases (Godoy-Lutz et al., 2004; Flores-Estévez et al., 2003; Rosas et al., 2000). Bean golden yellow mosaic virus (BGYMV), a whitefly [Bemisia tabaci (Gennadius)]-transmitted begomovirus, can cause significant reduction in common bean seed yield when susceptible bean cultivars are planted in Central America and the Caribbean (Coyne et al., 2003). Bean common mosaic virus (BCMV) and bean common mosaic necrosis virus (BCMNV) are seed-borne diseases that also cause yield loss in susceptible cultivars (Beaver and Osorno, 2009). Recently released black bean cultivars in Central America have the bgm-1 and / resistance genes and the SW12 QTL (Miklas et al., 2006) that provide resistance to BGYMV and BCMV. Unfortunately, bean cultivars with an unprotected / gene produce a top necrosis reaction when infected with BCMV (Beaver et al., 2003). Bean lines that combine the dominant / and the recessive bc-3 genes have resistance to all known strains of BCMV and BCMNV (Kelly et al., 1994). The objective of this research was to develop black bean breeding lines for Central America and the Caribbean that pyramid genes for resistance to BGYMV, BCMV and BCMNV.

RELEASE OF 'XRAV-40-4'BLACK BEAN (PHASEOLUS VULGARIS L.) CULTIVAR