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The Journal of Heredity 1984:75(2):113-116
© 1984 The American Genetic Association 75:113-116

research-article

Stem color and pleiotropy of genes determining flower color in the common morning glory

D. J. Schoen, D. E. Giannasi, R. A. Ennos, and M. T. Clegg

Departments of Botany and Molecular and Population Genetics, University of Georgia Athens, GA
Department of Biology, McGill University 1205 Avenue Docteur Penfield, Montréal, Québec H3A 1B1, Canada
Department of Botany, University of Georgia Athens, GA 30602
Department of Genetics, University of Newcastle upon Tyne Ridley Building, Newcastle upon Tyne, NE1 7RU, UK
Departments of Botany and Molecular and Population Genetics, University of Georgia Athens, GA 30602

Please address reprint requests to Dr. Clegg

Abstract

The common morning glory, Ipomoea purpurea, is a weedy annual vine abundant throughout much of the southeastern United States. Populations are typically polymorphic for flower color. The genetic control of stem color can be partially accounted for through the pleiotropic action of two of the loci involved in determining flower color. The locus P/p codes for pigment hue in both flower and stem, and I/i codes for pigment intensity in the two tissues. Biochemical analysis confirms the identical nature of the anthocyanidins in flowers and stems. Compared with flowers, however, stems contain fewer or less complex glycosides of the anthocyanidins. The expression of flower-color loci at an earlier stage of the plant life cycle adds another dimension to studies concerned with accounting for the maintenance of the flower-color polymorphism in this species.


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