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FLORAL PIGMENTATION PATTERNS IN CLARKIA (ONAGRACEAE)
L. D. Gottlieb
Vol. 36, No. 1 (JANUARY-MARCH 1989), pp. 1-8
Published by: California Botanical Society
Stable URL: http://www.jstor.org/stable/41424721
Page Count: 8
You can always find the topics here!Topics: Petals, Species, Genetics, Pigmentation, Plants, Diploidy, Alleles, Flowers, Biological taxonomies, Pigments
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The pattern of anthocyanin pigmentation on flower petals of species of Clarkia sections Rhodanthos and Godetia is reviewed. The petals have large spots, blotches, or bands of red-purple color near the base, the center, the upper margin or in several positions, or are unspotted. A recent genetic analysis in C. gracilis revealed that the large central petal spot characteristic of subsp. sonomensis is allelic to a basal petal spot in subsp. gracilis that is normally not expressed because of the action of a modifier gene. Since Clarkia species display only a small number of discrete pigmentation patterns, I suggest that the major components of pattern differences among them are not complex from a genetic standpoint. Novel patterns can be assembled by substituting alíeles at relatively few loci. Additional genes presumably contribute to various details of the patterns.
Madroño © 1989 California Botanical Society