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PMID: 17632573 Published · ppublish English Journal Article Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Review

How rhizobial symbionts invade plants: the Sinorhizobium-Medicago model.

Nature reviews. Microbiology ·Vol. 5 ·No. 8 ·2007-08-00 ·Pages 619-33

Jones KM, Kobayashi H, Davies BW, Taga ME, Walker GC

Abstract

Nitrogen-fixing rhizobial bacteria and leguminous plants have evolved complex signal exchange mechanisms that allow a specific bacterial species to induce its host plant to form invasion structures through which the bacteria can enter the plant root. Once the bacteria have been endocytosed within a host-membrane-bound compartment by root cells, the bacteria differentiate into a new form that can convert atmospheric nitrogen into ammonia. Bacterial differentiation and nitrogen fixation are dependent on the microaerobic environment and other support factors provided by the plant. In return, the plant receives nitrogen from the bacteria, which allows it to grow in the absence of an external nitrogen source. Here, we review recent discoveries about the mutual recognition process that allows the model rhizobial symbiont Sinorhizobium meliloti to invade and differentiate inside its host plant alfalfa (Medicago sativa) and the model host plant barrel medic (Medicago truncatula).

MeSH Terms
Bacterial Proteins/genetics,metabolism Gene Expression Regulation, Bacterial Medicago sativa/microbiology Medicago truncatula/microbiology Models, Biological Plant Proteins/genetics,metabolism Plant Roots/microbiology Root Nodules, Plant/microbiology Signal Transduction Sinorhizobium meliloti/genetics,physiology Symbiosis
Chemicals
Bacterial Proteins Plant Proteins
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Jones Kathryn M
Department of Biology, Massachusetts Institute of Technology, Building 68, Room 633, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Kobayashi Hajime
Davies Bryan W
Taga Michiko E
Walker Graham C
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Article Info
Journal
Nature reviews. Microbiology
Abbr.
Nat Rev Microbiol
ISSN
1740-1534
DOI
10.1038/nrmicro1705
Published
2007-08-00
Pages
619-33
Language
English
Region
England
NLM ID
101190261
PMCID
PMC2766523
Subset
IM
Grants
NIGMS NIH HHS · R01 GM031030 · United States
NIGMS NIH HHS · R01 GM031030-26 · United States
External Links
PubMed source DOI: 10.1038/nrmicro1705 PMC Full Text View journal details
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