Skip Navigation


JXB Advance Access originally published online on March 31, 2003
This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF) Freely available
Right arrow All Versions of this Article:
54/386/1481    most recent
erg156v1
Right arrow E-letters: Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when E-letters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (28)
Right arrowRequest Permissions
Right arrow Disclaimer
Google Scholar
Right arrow Articles by Catford, J.-G.
Right arrow Articles by Vierheilig, H.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Catford, J.-G.
Right arrow Articles by Vierheilig, H.
Agricola
Right arrow Articles by Catford, J.-G.
Right arrow Articles by Vierheilig, H.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Journal of Experimental Botany, Vol. 54, No. 386, pp. 1481-1487, May 1, 2003
© 2003 Oxford University Press

Suppression of arbuscular mycorrhizal colonization and nodulation in split-root systems of alfalfa after pre-inoculation and treatment with Nod factors

Received 26 November 2002; Accepted 21 February 2003

Jean-Guy Catford1, Christian Staehelin2, Sylvain Lerat1, Yves Piché1 and Horst Vierheilig4,1,3

1 CRBF, Faculté de Foresterie et de Géomatique, Université Laval, Pavillon C-E. Marchand, Ste-Foy G1K 7P4, Québec, Canada
2 Laboratoire de Biologie Moléculaire des Plantes Supérieures, Université de Genève, CH-1292 Chambésy/Genève, Switzerland
3 Institut für Pflanzenschutz, Universität für Bodenkultur Wien, Peter-Jordan-Str. 82, Vienna, Austria

4 To whom correspondence should be addressed. E-mail: nonhorst{at}boku.ac.at

Roots of legumes establish symbiosis with arbuscular mycorrhizal fungi (AMF) and nodule-inducing rhizobia. The existing nodules systemically suppress subsequent nodule formation in other parts of the root, a phenomenon termed autoregulation. Similarly, mycorrhizal roots reduce further AMF colonization on other parts of the root system. In this work, split- root systems of alfalfa (Medicago sativa) were used to study the autoregulation of symbiosis with Sinorhizobium meliloti and the mycorrhizal fungus Glomus mosseae. It is shown that nodulation systemically influences AMF root colonization and vice versa. Nodules on one half of the split-root system suppressed subsequent AMF colonization on the other half. Conversely, root systems pre-colonized on one side by AMF exhibited reduced nodule formation on the other side. An inhibition effect was also observed with Nod factors (lipo-chito-oligosaccharides). NodSm-IV(C16:2, S) purified from S. meliloti systemically suppressed both nodule formation and AMF colonization. The application of Nod factors, however, did not influence the allocation of 14C within the split-root system, excluding competition for carbohydrates as the regulatory mechanism. These results indicate a systemic regulatory mechanism in the rhizobial and the arbuscular mycorrhizal association, which is similar in both symbioses.

Key words: Arbuscular mycorrhiza, autoregulation, Glomales, Medicago sativa, Nod factors, nodulation, Sinorhizobium meliloti, split-root system.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 ANN BOT (LOND)Home page
J. Du, F.-H. Yu, P. Alpert, and M. Dong
Arbuscular mycorrhizal fungi reduce effects of physiological integration in Trifolium repens
Ann. Bot., August 1, 2009; 104(2): 335 - 344.
[Abstract] [Full Text] [PDF]

Home page
 Plant Physiol.Home page
D. A. Samac and M. A. Graham
Recent Advances in Legume-Microbe Interactions: Recognition, Defense Response, and Symbiosis from a Genomic Perspective
Plant Physiology, June 1, 2007; 144(2): 582 - 587.
[Full Text] [PDF]

Home page
 Plant Physiol.Home page
A. O. Ovtsyna, E. A. Dolgikh, A. S. Kilanova, V. E. Tsyganov, A. Y. Borisov, I. A. Tikhonovich, and C. Staehelin
Nod Factors Induce Nod Factor Cleaving Enzymes in Pea Roots. Genetic and Pharmacological Approaches Indicate Different Activation Mechanisms
Plant Physiology, October 1, 2005; 139(2): 1051 - 1064.
[Abstract] [Full Text] [PDF]

Home page
 J Exp BotHome page
R. E. Macchiavelli and G. Brelles-Marino
Nod factor-treated Medicago truncatula roots and seeds show an increased number of nodules when inoculated with a limiting population of Sinorhizobium meliloti
J. Exp. Bot., December 1, 2004; 55(408): 2635 - 2640.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.