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The Journal of Heredity 1992:83(2):135-139
© 1992 The American Genetic Association 83:135-139

research-article

Hybrid Weakness in Wild Phaseolus Vulgaris L.

E. M. K. Koinange, and P. Gepts

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

Address reprint requests to P. Gepts at the address above.

Abstract

Hybrid weakness (HW) is a usually lethal condition appearing in the F1 of crosses between certain Andean and Middle American common bean (Phaseolus vulgaris) cultivars; it is controlled by two complementary semidominant genes, DI1 and DI2, of Middle American and Andean origin, respectively. The objective of this study was to determine whether the DI1 and DI2 genes are present in the wild P. vulgaris gene pool and whether they exhibit the same geographic distribution as in their cultivated counterparts. Twenty Wild accessions chosen for their geographic range distribution and phaseol in and allozyme diversity were crossed to two testers (G00122 [GenBank] and G04830 [GenBank] ) known to have genes conditioning HW and to each other in half-diallel fashion. To promote the expression of HW, the F1 crosses were screened at high temperatures (25° C night, 35°C day). HW appeared in Middle American x Andean crosses but not in Middle American x Middle American or Andean x Andean crosses. Our results suggest that the DI genes arose before domestication as a consequence of geographic isolation, rather than as a consequence of selection pressure to eliminate unadapted hybrids among cultivars. They were introduced among cultivars presumably through domestication. Possible consequences for common bean breeding are presented.


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