Rhizobium (genus - antagonists)

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Rhizobium rhizogenes - agar colony
Source: Retina Gallery

Rhizobium (antagonists) (Frank 1889)

The species of this genus are Gram-negative bacteria which mainly colonize roots, form root nodules and fix nitrogen. The genus also includes some important tumour-forming species which cause crown gall diseases (see the plant pathogenic strains of Rhizobium). Some of the plant pathogenic species have strains which are non-pathogenic and which can be used as antagonists against the pathogenic strains. The latter group is covered here.

The taxonomy of the genus is still unresolved, especially how it relates to the genus Agrobacterium, see Rhizobium (plant pathogens).

The type species is Rhizobium leguminosarum.


The following antagonistic species are currently entered in the system: