TOWARDS AN INTEGRATED LINKAGE MAP OF COMMON BEAN - 4 - DEVELOPMENT OFA CORE LINKAGE MAP AND ALIGNMENT OF RFLP MAPS

Three RFLP maps, as well as several RAPD maps have been developed in c ommon bean (Phaseolus vulgaris L.). In order to align these maps, a co re linkage map was established in the recombinant inbred population BA T93 x Jalo EEP558 (BJ). This map has a total length of 1226 cM and com prises 563 markers, including some 120 RFLP and 430 RAPD markers, in a ddition to a few isozyme and phenotypic marker loci. Among the RFLPs m apped were markers from the University of California, Davis (establish ed in the Fz of the BJ cross), University of Paris-Orsay, and Universi ty of Florida maps. These shared markers allowed us to establish a cor respondence between the linkage groups of these three RFLP linkage map s. In total, the general map location (i.e., the linkage group members hip and approximate location within linkage groups) has been determine d for some 1070 markers. Approaches to align this core map with other current or future maps are discussed.