Fertile,intermediate hybrids between Phaseolus vulgaris and P. acutifolius from congruity backcrossing |
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Authors: | Kobra R Haghighi Peter D Ascher |
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Institution: | (1) Department of Horticultural Science and Landscape Architecture, University of Minnesota, 55108 St. Paul, MN, USA;(2) Present address: Department of Horticulture, Plant and Soil Science Building, Michigan State University, 48824 East Lansing, MI, USA |
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Abstract: | Summary Recurrent or introgressive backcrossing of Phaseolus vulgaris — P. acutifolius hybrids with either P. vulgaris or P. acutifolius increased fertility, as measured by pollen stainability and seed per pod from non-manipulated flowers, while invariably resulting in loss of traits from the non-recurrent parent. When hybrids were backcrossed with each of the parent species in alternate generations (congruity backcrossing), fertility decreased in early generations but gradually increased in later generations. By the fourth or fifth generation, congruity-backcross hybrids produced numbers of seeds per pod from non-manipulated flowers comparable to those of parent species, although the percent of stainable pollen tended to be lower. Congruity-backcross hybrids were intermediate to parent species when pedigrees contained equal representation of parents but favored the majority parent when pedigrees were unbalanced. Individuals exhibiting symptoms of developmental incongruity, such as abnormal leaflet number, foliar variagation, or unusual growth patterns, occurred in each generation. However, completely new characteristics appeared after the second backcross generation, presumably due to recombination. Backcrossing to both parent species in alternate generation reversed incongruity, allowing selection for fertility without loss of traits from one of the parent species.Scientific Journal Series Paper Number 15, 671 of the Minnesota Agricultural Experimental Station |
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Keywords: | Congruity backcrossing Recurrent backcrossing Incongruity Interspecific genetransfer Phaseolus vulgaris Phaseolus acutifolius |
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