Rhizobia

thumb|right|Root nodules, each containing billions of Rhizobiaceae bacteria

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Image: Lotus pedunculatus11 ies.jpg

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~17 min read

Article

19 sections

Contents

History
Taxonomy {{efn|As with many bacterium classifications, taxonomy work is still in progress as new genetic data and discoveries re-shuffle the existing phylogenetic tree}}
Importance in agriculture
Symbiotic relationship
Nature of the mutualism
Infection and signal exchange
Evolutionary hypotheses
The sanctions hypothesis
The partner choice hypothesis
Evolutionary history
Ecology
Effects of Rhizobia on Legume Host Characteristics
Effects of Mutualism on other Species
Context-Dependency of Mutualism
Other diazotrophs
Note
References
Further reading
External links

thumb|right|Root nodules, each containing billions of Rhizobiaceae bacteria

Rhizobia are diazotrophic bacteria that fix nitrogen after becoming established inside the root nodules of legumes (Fabaceae). To express genes for nitrogen fixation, rhizobia require a plant host; they cannot independently fix nitrogen. In general, they are gram negative, motile, non-sporulating rods.