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The Journal of Heredity 1985:76(6):468-470
© 1985 The American Genetic Association 76:468-470

other

Pseudo-self compatibility (PSC) in Petunia integrifolia

Michael N. Dana, and Peter D. Ascher

The authors are, respectively, assistant professor of horticulture, Purdue University, West Lafayette, Indiana 47907; and professor of horticulture, University of Minnesota, St. Paul, MN 55108. Scientific journal series paper no. 14, 067 of the Minnesota Agricultural Experiment Station. Please address reprint requests to P. D. Ascher.

Abstract

Petunia integrifoiia (P. violacea), a naturally occuring self incompatible (SI) species, is a putative parent of Petunia x hybrida. It was studied for its response to selection for increased pseudo-self compatibility (PSC). After two generations of selection, a population mean of 25.3 percent PSC was achieved with one > 90 percent PSC individual. Heat treatment prior to open flower and bud self pollinations resulted in a greater increase in PSC than ambient temperature bud self pollinations. The response indicates that PSC in P. x hybrida must be regarded as a natural phenomenon and not an artifact of horticultural interspecific hybridization.


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