Rhizobitoxine producers gain more poly-3-hydroxybutyrate in symbiosis than do competing rhizobia, but reduce plant growth

Legume sanctions against rhizobia that fix less nitrogen should exert a strong selection for more beneficial genotypes of rhizobia, but strains providing little host benefit are common. One reason may be that some rhizobia chemically manipulate the host, undermining the efficacy of sanctions. Here w...

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Bibliographic Details
Published inThe ISME Journal Vol. 3; no. 7; pp. 870 - 872
Main Authors Ratcliff, William C, Denison, R Ford
Format Journal Article
LanguageEnglish
Published England Nature Publishing Group 01.07.2009
Subjects
Antibiosis
Bacteria
Genotypes
Hydroxybutyrates - metabolism
Nitrogen
Plant Development
Plant growth
Plants - microbiology
Poly-3-hydroxybutyrate
Polyesters - metabolism
Propanolamines - metabolism
Rhizobiaceae - physiology
Symbiosis
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Summary:Legume sanctions against rhizobia that fix less nitrogen should exert a strong selection for more beneficial genotypes of rhizobia, but strains providing little host benefit are common. One reason may be that some rhizobia chemically manipulate the host, undermining the efficacy of sanctions. Here we show that the ethylene inhibitor, rhizobitoxine (Rtx), is an example of such a manipulation. Rtx-producing rhizobia decreased legume growth, but benefited relative to an isogenic, non-producing strain on the same plant by accumulating 47% more of the storage lipid poly-3-hydroxybutyrate (PHB).
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ISSN:1751-7362
1751-7370
DOI:10.1038/ismej.2009.38