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First published online May 28, 2004
doi: 10.1242/10.1242/dev.01186

Development 131, 2997-3006 (2004)
Published by The Company of Biologists 2004
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Asymmetric leaf development and blade expansion in Arabidopsis are mediated by KANADI and YABBY activities

Yuval Eshed1,2,*,{ddagger}, Anat Izhaki1,*, Stuart F. Baum1,{dagger}, Sandra K. Floyd1 and John L. Bowman1,{ddagger}

1 Section of Plant Biology, Division of Biological Sciences, University of California, One Shields Avenue, Davis, CA 95616, USA
2 Department of Plant Sciences, The Weizmann Institute of Science, Rehovot, 76100 Israel

{ddagger} Authors for correspondence (e-mail: jlbowman{at}ucdavis.edu and yuval.eshed{at}weizmann.ac.il)

Accepted 18 March 2004

Asymmetric development of plant lateral organs is initiated by a partitioning of organ primordia into distinct domains along their adaxial/abaxial axis. Two primary determinants of abaxial cell fate are members of the KANADI and YABBY gene families. Progressive loss of KANADI activity in loss-of-function mutants results in progressive transformation of abaxial cell types into adaxial ones and a correlated loss of lamina formation. Novel, localized planes of blade expansion occur in some kanadi loss-of-function genotypes and these ectopic lamina outgrowths are YABBY dependent. We propose that the initial asymmetric leaf development is regulated primarily by mutual antagonism between KANADI and PHB-like genes, which is translated into polar YABBY expression. Subsequently, polar YABBY expression contributes both to abaxial cell fate and to abaxial/adaxial juxtaposition-mediated lamina expansion.

Key words: Arabidopsis, Leaves, Abaxial-adaxial polarity, Pattern formation, YABBY, KANADI




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