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

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

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    168 Scopus citations

    Abstract

    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
    Volume14
    Issue number11
    DOIs
    StatePublished - Nov 1 2002

    ASJC Scopus subject areas

    • Plant Science
    • Biochemistry, Genetics and Molecular Biology(all)
    • Biochemistry
    • Cell Biology

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