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THE PLANT CELL, Vol 9, Issue 1 37-47, Copyright © 1997 by American Society of Plant Biologists
Photo and Hormonal Control of Meristem Identity in the Arabidopsis Flower Mutants apetala2 and apetala1
J. K. Okamuro, W. Szeto, C. Lotys-Prass and K. D. Jofuku
Department of Biology, Sinsheimer Laboratories, University of California, Santa Cruz, California 95064
We have analyzed the contributions of phytochrome and gibberellin signal
transduction to the control of flower meristem identity in the Arabidopsis
mutants apetala1 (ap1) and apetala2 (ap2). ap1 flowers are partially
defective for the establishment of flower meristem identity and are
characterized by the production of ectopic secondary or axillary flowers
and by branching. Axillary flower production is also induced in ap2-1
flowers by short-day photoperiod and is suppressed by hy1, a mutation
blocking phytochrome activity. The production of axillary flowers by ap2-1
is also suppressed by exogenous gibberellins and by spindly (spy), a
mutation that activates basal gibberellin signal transduction in a
hormone-independent manner. Ectopic axillary flower production and floral
branching by ap1 flowers are also suppressed by spy. We conclude that
gibberellins promote flower meristem identity and that the
inflorescence-like traits of ap2-1 and ap1-1 flowers are due in part to SPY
gene activity.
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