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The Journal of Heredity 1985:76(6):447-450
© 1985 The American Genetic Association 76:447-450

research-article

F1 hybrid weakness in the common bean

Differential geographic origin suggets two gene pools in cultivated bean germplasm

P. Gepts, and F. A. Bliss

The authors are affiliated with the Department of Horticulture, University of Wisconsin, 1575 Linden Drive, Madison, WI 53706. They are indebted to K. Krniecik for technical assistance. This research was supported by funds of the College of Agriculture and Life Sciences, University of Wisconsin-Madison, and of the USDA under grant no. 81-CRCR-1-0604 of the Competitive Grants Office.

Abstract

The geographic origin of cultivars involved in F1 hybrid weakness was established using phaseolin type, as determined by one-dimensional SDS/PAGE. In all cases investigated, F1 weakness arose in crosses between an ‘S’ phaseolin, small-seeded parent of Middle American origin and a ‘T’ or a ‘C’ phaseolin, large-seeded parent of Andean origin. The appearance of F1 hybrid weakness reflects the geographical isolation of common bean cultivars of the two regions and points to the existence of two separate gene pools in cultivated common bean germplasm.


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