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The Journal of Heredity 1995:86(2):98-106
© 1995 The American Genetic Association 86:98-106

research-article

Segregation and Recombination in Inter-Gene Pool Crosses of Phaseolus Vulgaris L.

O. M. Paredes, and P. Gepts

Department of Agronomy and Range Science, University of California Davis, CA 95616-8515

Address correspondence to P. Gepts

Abstract

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 was analyzed in 11 F2 populations derived from Middle American x Andean, and Andean x Andean crosses. An average level of 10.4% segregation distortion for RFLPs was observed compared with 19.2% for isozyme markers. Preferential transmission of Middle American alleles was detected in crosses between the two gene pools. Levels of recombination were highly variable among a subject of four of the 11 F2 populations analyzed. 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.


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