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Genetic linkage between isozyme, morphological, and DNA markers in tepary bean



Genetic linkage between isozyme, morphological, and DNA markers in tepary bean



Journal of Heredity 85(4): 273-278



A genetic map of tepary bean (Phaseolus acutifolius A. Gray) may be useful to plant breeders attempting to transfer desirable genes from this species to other Phaseolus species. In order to expand the genetic information available for tepary bean, the inheritance of and linkage relationships among 23 morphological, isozyme, and RFLP markers were determined. All but one of the characters segregated in a monogenic fashion, and low levels of segregation distortion were observed. New two-locus linkages identified included Aat-2/Gpi-c2, Aco-2/Dia-3, and Dia-3/Idh-x. Nine of the 23 loci exhibited linkage to other loci analyzed and could be assigned to one of three distinct linkage groups. Two tepary bean linkage groups (Adh-1/Aat-Z Aco-2/Dia-3) appear to be conserved in common bean, although the linkage estimates for Adh-1/Aat-2 are dramatically different in these species. The Adh-1/Aat-2 linkage also appears to be conserved in lentil and pea. Additionally, the Gpi-c1/Pgd-3 linkage has a possible counterpart in soybean, and the Fdh-1/Gpi-c1 linkage in tepary bean is maintained in chickpea.

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Accession: 002390994

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