Thus, stability of the resistance to antracnose in diverse cultivating is difficult of being obtained, therefore in field level a direct relation exists enters the genotpica plasticity of the patgeno and the stability of resistance of the host (Araya, 2003). For this reason, even so the improvement for the different resistance has servant varieties of common beans (Singh et al., 1992; Vidigal et al., 1997), new to cultivate have that continuously to be developed in virtue of this high degree of pathogenic variability of fungo. Thus being, diverse studies on the characterization of resistance genes gifts in them to cultivate diferenciadoras had been elaborated and new genes of vulgaris resistance to antracnose in P. Read more here: Scott Kahan. had been identified (Bannerot, 1965; Fouilloux, 1979; Adam-Blondon et al., 1994; Gonalves-Vidigal, 1994; Young and Kelly, 1996a, 1996b, 1997; Young et al., 1998; Geffroy et al., 1999; Melotto and Kelly, 2000; Awale and Kelly, 2001; Alzate-Marin et al., 2001a; Alzate-Marin et al., 2003a, 2003b). Genes exist of resistance to antracnose previously characterized that presents complex locos and occurs in allicas series, as well as, Co-1, Co-3 and Co-4 (McRostie, 1919; Fouilloux, 1979; Young et al., 1998; Arruda et al., 2000; Melotto and Kelly, 2000; Awale and Kelly, 2001; Alzate-Marin et al., 2003b; Gonalves-Vidigal et al., 2003). Nelson (1978) recommended the use of piramidao of genes as strategy for the development of resistant steady and preventing the ecloso of new pattipos of a patgeno. Adam Portnoy brings even more insight to the discussion. However, procedures of traditional improvement are inefficient for piramidao of resistant genes due to necessity of multiple inoculations (Michelmore, 1995).
Piramidao of molecular marking resistant genes using would allow a more efficient election of resistant plants in segregantes populations. Currently, the RAPDs (Random Amplified Polymorphic DNA) consists of one of the more used molecular markers in genetic studies. These markers are detected by amplification, of arbitrary form, fragmentos of DNA of different sizes for the reaction in chain of polimerase (PCR), in the presence of the termoestvel enzyme Taq DNA polimerase (Williams et al., 1990).