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THE PLANT CELL, Vol 4, Issue 8 901-913, Copyright © 1992 by American Society of Plant Biologists
LEAFY Interacts with Floral Homeotic Genes to Regulate Arabidopsis Floral Development
E. Huala and I. M. Sussex
Department of Plant Biology, University of California, Berkeley, California 94720
In the leafy mutant of Arabidopsis, most of the lateral meristems that are
fated to develop as flowers in a wild-type plant develop as inflorescence
branches, whereas a few develop as abnormal flowers consisting of whorls of
sepals and carpels. We have isolated several new alleles of leafy and
constructed a series of double mutants with leafy and other homeotic
mutants affecting floral development to determine how these genes interact
to specify the developmental fate of lateral meristems. We found that leafy
is completely epistatic to pistillata and interacts additively with agamous
in early floral whorls, whereas in later whorls leafy is epistatic to
agamous. Double mutants with leafy and either apetala1 or apetala2 showed a
complete loss of the whorled phyllotaxy, shortened internodes, and
suppression of axillary buds typical of flowers. Our results suggest that
the products of LEAFY, APETALA1, and APETALA2 together control the
differentiation of lateral meristems as flowers rather than as
inflorescence branches.
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