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The Journal of Heredity 1988:79(4):289-293
© 1988 The American Genetic Association 79:289-293

research-article

Inheritance of Ray Floret Color in Zinnia angustifolia HBK and Z. elegans Jacq.

T. H. Boyle, and D. P. Stimart

Department of Horticulture, University of Maryland, College Park

Address reprint requests to Dr. Boyle, Department of Plant and Soil Sciences, French Hall, University of Massachusetts, Amherst, MA 01003.

Abstract

The inheritance of ray floret color was investigated forZinnia elegans Jacq. and Z. angustifolia HBK. For genetic analysis, five inbred lines of Z. elegans with orange, pink, red, white, or yellow ray florets were selfed and crossed to obtain S1, F1, F2, and BC1 populations; five clones of Z. angustifolia with ivory, orange, or white ray florets were selfed and crossed to generate S1 and F1 populations. In Z. elegans, the presence of the anthocyanidins pelargonidin and cyanidin was controlled by a single dominant gene (An1). Carotenoid expression in Z. elegans was conditioned by a recessive gene (ca) governing its presence and other genes controlling carotenoid patterning in petals. The presence of two unidentified anthocyanidins in orange-flowered Z. angustifolia was controlled by a single dominant gene (An2). It is suggested that An1 and An2 are nonallelic and control different processes in anthocyanidin biosynthesis.


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