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

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

doi:10.1105/tpc.004911

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 journal › Article › peer-review

207 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 language	English (US)
Pages (from-to)	2761-2770
Number of pages	10
Journal	Plant Cell
Volume	14
Issue number	11
DOIs	https://doi.org/10.1105/tpc.004911
State	Published - Nov 1 2002
Externally published	Yes

ASJC Scopus subject areas

Plant Science
Cell Biology

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title = "YABBY polarity genes mediate the repression of KNOX homeobox genes in Arabidopsis",

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.",

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AU - Bowman, John L.

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

Abstract

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