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With two-species, bidirectional P. vulgarísx P. acutifolius CBC pedigrees, transference of economically important traits from P. acutifolius into P. vulgaris have been reported (Petersen, 1993; Anderson, et al., 1995). Transgressive, individuals surfaced with novei mechanisms of drought tolerance. More recent studies have shown that other traits were transmitted to produce CBC individuals with morphological or biochemical markers of nonparental Phaseolus species. While these two species differ for many important traits, they both possess many of the same "species genes" described by Lamprecht (1948). Species genes mean that all members of the same species are homozygous for alíeles (usually dominant) encoding the diagnostic trait. P. vulgaris and P. coccineiis have been frequently employed to create interspecific hybrids. Both species differ for species genes controlling cotyledon (epigeal / hypogeal) and stigma position (introrse / intermediate / extrorse). There have been no reports of recombination for species-specific traits. We initiated a CBC crossing scheme involving these two species as parents to test the effectiveness of CBC in disrupting the species-specific traits, i.e. would CBC disrupt the tight linkages between these two species.

Morphological and Biochemical Variability in Two-species Congruity Backcross (CBC) Phaseolus vulgaris × P. coccineus Hybrids