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Plant Cell Advance Online Publication
Published on October 11, 2002; 10.1105/tpc.004911

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Received May 31, 2002
Accepted August 19, 2002

YABBY Polarity Genes Mediate the Repression of KNOX Homeobox Genes in Arabidopsis

Mande K. Kumaran 1, John L. Bowman 2, and Venkatesan Sundaresan 3*

1 Institute of Molecular Agrobiology, National University of Singapore, Singapore 117604
2 Department of Plant Biology, University of California, Davis, California 95616
3 Institute of Molecular Agrobiology, National University of Singapore, Singapore 117604; Department of Plant Biology, University of California, Davis, California 95616; Department of Agronomy, University of California, Davis, California 95616

* To whom correspondence should be addressed. E-mail: sundar{at}ucdavis.edu.

The YABBY (YAB) genes specify abaxial cell fate in lateral organs in Arabidopsis. Loss-of-function mutants in two early-expressing YAB genes, FILAMENTOUS FLOWER (FIL) and YAB3, do not exhibit vegetative phenotypes as a result of redundancy. Mutations in these genes result in the derepression of the KNOX homeobox genes SHOOTMERISTEMLESS (STM), BREVIPEDICELLUS, and KNAT2 in the leaves and in the partial rescue of stm mutants. Here, we show that fil yab3 double mutants exhibit ectopic meristem formation on the adaxial surfaces of cotyledons and leaf blades. We propose that in addition to abaxial specification, lateral organ development requires YAB function to downregulate KNOTTED homeobox genes so that meristem initiation and growth are restricted to the apex.






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