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The Journal of Heredity 1989:80(6):468-471
© 1989 The American Genetic Association 80:468-471

research-article

Comparison of 2n and Non-2n Pollen-Producing Haploid × Wild Species Hybrids in Potato

G. L. Yerk, and S. J. Peloquin

From the Departments of Horticulture and Genetics, University of Wisconsin Madison

Address reprint requests to Dr. Peloquin, Department of Horticulture, University of Wisconsin, Madison, WI 53706.

Abstract

Haploid x wild species hybrids (2n = 2x = 24) provide a means of capturing the germ plasm of the 2x, 2EBN wild Solatium spp. in a form in which it can be maintained and evaluated. 2n pollen allows introgression of germ plasm from haploid × wild species hybrids into cultivars through 4x x 2x crosses. 2n pollen-producing and non-2n pollen-producing hybrids were compared from the same population in regard to seven agronomic and breeding characteristics to determine appropriate selection strategies. Early in the growing season, the 2n pollen producers are significantly more vigorous and flower significantly more; however, by the latter part of the growing season they do not differ from the non-2n pollen producers. The 2n pollen producers are also significantly later in maturity than are the non-2n pollen producers, suggesting that conscious selection for earliness is necessary within this material. No significant difference was observed between the two groups in terms of yield, specific gravity, tuber number, general tuber appearance, and percentage tuberization per family. Breeding, genetic, and evolutionary implications are discussed.


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