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PMID: 21504914 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Review

Auxin, cytokinin and the control of shoot branching.

Annals of botany ·Vol. 107 ·No. 7 ·2011-05-00 ·Pages 1203-12

Müller D, Leyser O

Abstract

It has been known for many decades that auxin inhibits the activation of axillary buds, and hence shoot branching, while cytokinin has the opposite effect. However, the modes of action of these two hormones in branching control is still a matter of debate, and their mechanisms of interaction are equally unresolved. Here we review the evidence for various hypotheses that have been put forward to explain how auxin and cytokinin influence axillary bud activity. In particular we discuss the roles of auxin and cytokinin in regulating each other's synthesis, the cell cycle, meristem function and auxin transport, each of which could affect branching. These different mechanisms have implications for the main site of hormone action, ranging from systemic action throughout the plant, to local action at the node or in the bud meristem or leaves. The alternative models have specific predictions, and our increasing understanding of the molecular basis for hormone transport and signalling, cell cycle control and meristem biology is providing new tools to enable these predictions to be tested.

MeSH Terms
Cytokinins/metabolism Indoleacetic Acids/metabolism Meristem/growth & development,metabolism Models, Biological Plant Shoots/growth & development,metabolism
Chemicals
Cytokinins Indoleacetic Acids
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Müller Dörte
Department of Biology, University of York, York, UK.
Leyser Ottoline
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Article Info
Journal
Annals of botany
Abbr.
Ann Bot
ISSN
1095-8290
DOI
10.1093/aob/mcr069
Published
2011-05-00
Epub
2011-00-18
Pages
1203-12
Language
English
Region
England
NLM ID
0372347
PMCID
PMC3091808
Subset
IM
Grants
Biotechnology and Biological Sciences Research Council · BB/E024750/1 · United Kingdom
External Links
PubMed source DOI: 10.1093/aob/mcr069 PMC Full Text View journal details
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