SEGREGATION AND RECOMBINATION IN INTER-GENE POOL CROSSES OF PHASEOLUS-VULGARIS L

Variation for segregation ratios and recombination rates was analyzed in crosses involving 13 common bean (Phaseolus vulgaris L.) genotypes from different gene pools and races, The segregation of RFLP, isozyme, and phaseolin markers belonging mostly to linkage groups D5 and D7 wa s analyzed in 11 F-2 populations derived from Middle American x Andean , and Andean x Andean crosses, An average level of 10.4% segregation d istortion for RFLPs was observed compared with 19.2% for isozyme marke rs, Preferential transmission of Middle American alleles was detected in crosses between the two gene pools, Levels of recombination were hi ghly variable among a subset of four of the 11 F-2 populations analyze d. These data, and comparisons with data published previously, suggest that recombination in common bean is under genetic control, although environmental factors may also affect it.