Format

Send to

Choose Destination
See comment in PubMed Commons below
Proc Natl Acad Sci U S A. 2006 Jan 10;103(2):472-6. Epub 2005 Dec 30.

MAX1, a regulator of the flavonoid pathway, controls vegetative axillary bud outgrowth in Arabidopsis.

Author information

1
Department of Genetics, Harvard Medical School, USA. lazar@molbio.mgh.harvard.edu

Abstract

We show that MAX1, a specific repressor of vegetative axillary bud outgrowth in Arabidopsis, acts a positive regulator of the flavonoid pathway, including 11 structural genes and the transcription factor An2. Repression of bud outgrowth requires MAX1-dependent flavonoid gene expression. As the flavonoidless state leads to lateral outgrowth in Arabidopsis, our data suggest that a flavonoid-based mechanism regulates axillary bud outgrowth and that this mechanism is under the control of MAX1. Flavonoid gene expression results in the diminished expression of auxin transporters in the bud and stem, and this, in turn, decreases the rate of polar auxin transport. We speculate that MAX1 could repress axillary bud outgrowth via regulating flavonoid-dependent auxin retention in the bud and underlying stem. Because MAX1 is implicated in synthesis of the carotenoid-derived branch regulator(s) from the root, it likely links long-distance signaling with local control of bud outgrowth.

PMID:
16387852
PMCID:
PMC1324789
DOI:
10.1073/pnas.0509463102
[Indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Support Center