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THE PLANT CELL, Vol 7, Issue 10 1635-1644, Copyright © 1995 by American Society of Plant Biologists
Conservation of Floral Homeotic Gene Function between Arabidopsis and Antirrhinum
V. F. Irish and Y. T. Yamamoto
Department of Biology, Osborn Memorial Laboratory, P.O. Box 208104, Yale University, New Haven, Connecticut 06520-8104
Several homeotic genes controlling floral development have been isolated in
both Antirrhinum and Arabidopsis. Based on the similarities in sequence and
in the phenotypes elicited by mutations in some of these genes, it has been
proposed that the regulatory hierarchy controlling floral development is
comparable in these two species. We have performed a direct experimental
test of this hypothesis by introducing a chimeric Antirrhinum Deficiens
(DefA)/Arabidopsis APETALA3 (AP3) gene, under the control of the
Arabidopsis AP3 promoter, into Arabidopsis. We demonstrated that this
transgene is sufficient to partially complement severe mutations at the AP3
locus. In combination with a weak ap3 mutation, this transgene is capable
of completely rescuing the mutant phenotype to a fully functional wild-type
flower. These observations indicate that despite differences in DNA
sequence and expression, DefA coding sequences can compensate for the loss
of AP3 gene function. We discuss the implications of these results for the
evolution of homeotic gene function in flowering plants.
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