Abstract
INDUCED homeotic floral mutants in Arabidopsis thaliana and Antirrhinum majus1–3 are used to investigate the molecular mechanisms that establish floral organ identity. Here we describe bicalyx, a naturally occurring homeotic floral variant in Clarkia concinna (Onagraceae) that replaces petals with sepal-like structures. Typical C. concinna flowers have four sepals, four tri-lobed, bright pink petals, four stamens and a four-part ovary. Bicalyx flowers appear to have eight sepals, no petals and wild-type stamens and ovary with no reduction in fertility. All bicalyx organs on a plant are alike and have no developmental abnormalities, in contrast to many of the homeotic phenotypes described4–7. Bicalyx demonstrates that a large morphological difference governed by a simple genetic change can become established in a natural plant population and suggests that even homeotic genes play a role in the evolution of morphological diversity in plants.
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Ford, V., Gottlieb, L. Bicalyx is a natural homeotic floral variant. Nature 358, 671–673 (1992). https://doi.org/10.1038/358671a0
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DOI: https://doi.org/10.1038/358671a0
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