Document Detail

Failure to fix nitrogen by non-reproductive symbiotic rhizobia triggers host sanctions that reduce fitness of their reproductive clonemates.
MedLine Citation:
PMID:  21270038     Owner:  NLM     Status:  MEDLINE    
The legume-rhizobia symbiosis is a classical mutualism where fixed carbon and nitrogen are exchanged between the species. Nonetheless, the plant carbon that fuels nitrogen (N(2)) fixation could be diverted to rhizobial reproduction by 'cheaters'--rhizobial strains that fix less N(2) but potentially gain the benefit of fixation by other rhizobia. Host sanctions can decrease the relative fitness of less-beneficial reproductive bacteroids and prevent cheaters from breaking down the mutualism. However, in certain legume species, only undifferentiated rhizobia reproduce, while only terminally differentiated rhizobial bacteroids fix nitrogen. Sanctions were, therefore, tested in two legume species that host non-reproductive bacteroids. We demonstrate that even legume species that host non-reproductive bacteroids, specifically pea and alfalfa, can severely sanction undifferentiated rhizobia when bacteroids within the same nodule fail to fix N(2). Hence, host sanctions by a diverse set of legumes play a role in maintaining N(2) fixation.
Ryoko Oono; Carolyn G Anderson; R Ford Denison
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-01-26
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  278     ISSN:  1471-2954     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-07-27     Completed Date:  2011-12-05     Revised Date:  2013-06-30    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  2698-703     Citation Subset:  IM    
Department of Plant Biological Sciences, University of Minnesota, 250 Biological Sciences, 1445 Gortner Avenue, Saint Paul, MN 55108, USA.
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MeSH Terms
Medicago sativa / metabolism,  microbiology*
Nitrogen Fixation*
Peas / metabolism,  microbiology*
Plant Roots / microbiology
Rhizobium leguminosarum / genetics,  growth & development*,  metabolism
Sinorhizobium meliloti / genetics,  growth & development*,  metabolism
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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