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The Journal of Heredity 1997:88(6):537-540
© 1997 The American Genetic Association 88:537-540

other

Genetic Marker Transmission in Early Generation Common x Tepary Bean Hybrids

D. F. Garvin, C. T. Federici, E. J. Stockinger, and J. G. Waines

Department of Botany and Plant Sciences, University of California Riverside, CA, 92521
Dr. Garvin is now at the U.S. Plant, Soil, and Nutrition Laboratory Tower Road, Ithaca, New York
Dr. Stockinger is now at Michigan State University East Lansing, Michigan

Corresponding Editor: Susan Gabay-Laughnan

Abstract

A set of BC1F2 populations derived from common bean x tepary bean interspecific hybrids was examined for isozyme segregation within 12 different enzyme systems. The BC1F1 parents of the BC1F2 populations, as inferred from the BC1F2 progeny data, were found to be heterozygous for approximately half of the marker loci examined, in agreement with transmission genetic theory predictions. In contrast, segregation ratios for isozyme loci in the BC1F2 families deviated significantly from expected Mendelian ratios in approximately 50% of the cases, due to a severe deficiency of individuals homozygous for the tepary allele, as well as having a deficiency of heterozygotes in some cases. Using data from a diagnostic pair of linked isozyme loci, evidence of intergenomic recombination at levels equal to or greater than that encountered in intraspecific crosses was detected in one BC1F2 family.


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