What are rhizobia?

Rhizobia is the common name given to a group of small, rod- shaped, Gram -ve bacteria, which collectively have the ability to produce nodules on the roots (or, in some cases, the stems) of leguminous plants. In early studies with these organisms, it was established that no strain could nodulate all legumes, but that each could nodulate some legumes though not others. This led to the concept of cross-inoculation groups, with organisms grouped according to the hosts they nodulated.

For a time this was the basis on which rhizobia were identified. Thus, rhizobia isolated from one species of clover would usually nodulate other species of clover, and were then collectively called Rhizobium trifolii, while rhizobia isolated from medics would also nodulate lucerne and fenugreek, and were called R.meliloti. This specificity is still very important in selecting the appropriate inoculant for your crop or planting, and the wrong choice of inoculant is still a common cause of nodulation failure.

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