YABBY polarity genes mediate the repression of KNOX homeobox genes in Arabidopsis

Mande K. Kumaran, John L. Bowman, Venkatesan Sundaresan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

202 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)2761-2770
Number of pages10
JournalPlant Cell
Issue number11
StatePublished - Nov 1 2002
Externally publishedYes

ASJC Scopus subject areas

  • Plant Science
  • Cell Biology


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