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PMID: 19641034 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Interactions between auxin and strigolactone in shoot branching control.

Plant physiology ·Vol. 151 ·No. 1 ·2009-09-00 ·Pages 400-12

Hayward A, Stirnberg P, Beveridge C, Leyser O

Abstract

In Arabidopsis (Arabidopsis thaliana), the carotenoid cleavage dioxygenases MORE AXILLARY GROWTH3 (MAX3) and MAX4 act together with MAX1 to produce a strigolactone signaling molecule required for the inhibition of axillary bud outgrowth. We show that both MAX3 and MAX4 transcripts are positively auxin regulated in a manner similar to the orthologous genes from pea (Pisum sativum) and rice (Oryza sativa), supporting evolutionary conservation of this regulation in plants. This regulation is important for branching control because large auxin-related reductions in these transcripts are associated with increased axillary branching. Both transcripts are up-regulated in max mutants, and consistent with max mutants having increased auxin in the polar auxin transport stream, this feedback regulation involves auxin signaling. We suggest that both auxin and strigolactone have the capacity to modulate each other's levels and distribution in a dynamic feedback loop required for the coordinated control of axillary branching.

MeSH Terms
Arabidopsis/genetics,growth & development,metabolism Arabidopsis Proteins/genetics,metabolism Down-Regulation Gene Expression Regulation, Plant/physiology Indoleacetic Acids/metabolism Lactones/metabolism Plant Shoots/growth & development,metabolism Signal Transduction Up-Regulation
Chemicals
Arabidopsis Proteins Indoleacetic Acids Lactones
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Hayward Alice
University of Queensland, School of Biological Sciences, Australian Research Council Centre of Excellence for Integrative Legume Research, Queensland 4072, Australia.
Stirnberg Petra
Beveridge Christine
Leyser Ottoline
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Article Info
Journal
Plant physiology
Abbr.
Plant Physiol
ISSN
0032-0889
DOI
10.1104/pp.109.137646
Published
2009-09-00
Epub
2009-00-29
Pages
400-12
Language
English
Region
United States
NLM ID
0401224
PMCID
PMC2735998
Subset
IM
Grants
Biotechnology and Biological Sciences Research Council · BB/C518057/1 · United Kingdom
External Links
PubMed source DOI: 10.1104/pp.109.137646 PMC Full Text View journal details
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