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

Mande K. Kumaran | Zendy; John L. Bowman | Zendy; Venkatesan Sundaresan | Zendy

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

Author(s) -

Mande K. Kumaran,

John L. Bowman,

Venkatesan Sundaresan

Publication year - 2002

Publication title -

the plant cell

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.324

H-Index - 341

eISSN - 1532-298X

pISSN - 1040-4651

DOI - 10.1105/tpc.004911

Subject(s) - homeobox , biology , meristem , arabidopsis , mutant , gene , genetics , phenotype , psychological repression , ectopic expression , microbiology and biotechnology , transcription factor , gene expression

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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