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served for DBeQ the linkage groups b02d, b03c and b08f, principally. For linkage group b02d the distorted loci were in the middle of the linkage group, while for b03c and b08f they were located distally. Integration of the genetic and physical maps In the integration phase of this study, we used a method based DBeQ on the use of BES SSR anchoring points which was expected to be highly precise and accurate if the contig assembly had been performed well, The BES SSR markers used as anchor points allowed us to integrate 5,055 BAC clones through 99 contigs which together had a physical length of 47. 1 Mb based on the FPC assembly, thus corresponding to 7.

4% of the bean genome based on a genome size of 637 Mb, The genome coverage of the integrated map of com mon bean could be increased by using a larger number of contig based BES SSR markers as RGFP966 was done for the integrated map of Medicago truncatula, Protein biosynthesis For exam ple, if the 623 BES SSR microsatellite loci had been screened, they potentially would have linked 20,861 BAC clones, almost half RGFP966 the library, while the 230 selected BES SSRs represented contigs with 11,913 BAC clones from the fingerprinting described in Schlueter et al, The integrated common bean genetic physical map is saturated enough to map QTL or genes to physi cal regions of the genome. The integrated map, apart from being a resource for genetic mapping or positional cloning, could be used to find new linkages between contigs. In this case, only two BMb markers were close enough to postulate the possible overlap or close proximity of their constituent BAC clones.

For the other BES SSR markers, clear genetic separation showed that none of the assembled contigs overlapped with each other. Despite this, these results do not preclude the possibility of merging contigs through further genetic mapping. Conclusions Apart from our objective of saturating DBeQ the DOR364 × G19833 genetic map with BES SSR markers, our other main goal was the integration of the physical map of common bean with this genetic map. The importance of an integrated physical and genetic map is in its ability to physically locate loci that are known to be polymorphic between mapping parents with a high degree of preci sion and accuracy to a set of contigged large insert clones or sequences. In silico method used for SSR identification in BAC end sequences was a good option for obtaining wide spread and evenly distributed markers of adequate poly morphism.

The genetic map was saturated in SSRs and was easily linked to the physical map. It is pertinent to take into account the robustness of the integrated map obtained because the same genotype RGFP966 used for the DBeQ physi cal map construction was one of the parents of the mapping populations used to place BES SSR markers. Methods Identification of SSRs in the BAC ends A total of 89,017 BAC end sequences produced as part of the physical mapping project described in Schlueter et al. and originally from a BAC library of the Andean common bean genotype G19833 were searched for SSR repeats with BatchPrimer3 from You et al, This software has a flexible interface where the user can specify various parameters.

In this case, the criterion used for the microsatellite search was RGFP966 a minimum of five repetitions for di nucleotide motifs, four repetitions for tri nucleotide motifs and three repetitions for tetra or penta nucleotide motifs. Primer design conditions were for a length of 18 23 nt and a melting temperature of 50 60 C. Primers were designed around the SSR motif such that the PCR product size would be between 100 and 300 base pairs, BES SSR amplification PCR reactions were carried out in a final volume reac tion of 15 ul containing 20 ng of total genomic DNA, 0. 15 uM each of the forward and reverse primers, 2. 0 mM of MgCl2, 200 uM of total dNTP and 1 unit of Taq polymerase. The PCR program involved a touchdown profile with a hot start of 93 C for 3 min. followed by denaturation for 30 sec at 92 C. then annealing for 30 sec at the Tm of