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Asymmetric leaf development and blade expansion in Arabidopsis are mediated by KANADI and YABBY activities

2004; The Company of Biologists; Volume: 131; Issue: 12 Linguagem: Inglês

10.1242/dev.01186

1477-9129

Yuval Eshed, Anat Izhaki, Stuart F. Baum, Sandra K. Floyd, John L. Bowman,

Tree Root and Stability Studies

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.