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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
REVIEW

Legume nodulation: successful symbiosis through short- and long-distance signalling

Mark Kinkema A , Paul T. Scott A and Peter M. Gresshoff A B
+ Author Affiliations
- Author Affiliations

A ARC Centre of Excellence for Integrative Legume Research, The University of Queensland, St Lucia, Brisbane, Qld 4072, Australia.

B Corresponding author. Email: p.gresshoff@uq.edu.au

Functional Plant Biology 33(8) 707-721 https://doi.org/10.1071/FP06056
Submitted: 17 March 2006  Accepted: 22 May 2006   Published: 2 August 2006

Abstract

Nodulation in legumes provides a major conduit of available nitrogen into the biosphere. The development of nitrogen-fixing nodules results from a symbiotic interaction between soil bacteria, commonly called rhizobia, and legume plants. Molecular genetic analysis in both model and agriculturally important legume species has resulted in the identification of a variety of genes that are essential for the establishment, maintenance and regulation of this symbiosis. Autoregulation of nodulation (AON) is a major internal process by which nodule numbers are controlled through prior nodulation events. Characterisation of AON-deficient mutants has revealed a novel systemic signal transduction pathway controlled by a receptor-like kinase. This review reports our present level of understanding on the short- and long-distance signalling networks controlling early nodulation events and AON.


Acknowledgments

We thank the Australian Research Council, the University of Queensland Strategic Research Fund and the Queensland State Government Smart State Initiative for funding under the Centre of Excellence Scheme. Special thanks are given to CILR members, especially Dr Attila Kereszt, for providing unpublished data and valued criticism.


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