Definition of rhizobium in English:



  • A nitrogen-fixing bacterium that is common in the soil, especially in the root nodules of leguminous plants.

    Genus Rhizobium; Gram-negative rods

    • ‘Legume roots are known to exude various flavonoid and isoflavonoid molecules that induce expression of nod genes by bacteria in rhizobia.’
    • ‘Closer to the point of attachment to the root, membrane-bound compartments containing rhizobia are released into plant cells where the rhizobia differentiate into bacteroids, the form capable of fixing N 2.’
    • ‘Since these two cover crops are legumes, they form a symbiosis with specialized soil bacteria called rhizobia.’
    • ‘In an exciting paper, Fox describes how estrogen signals between plants and their symbiotic rhizobium soil bacteria can be disrupted by agricultural chemicals.’
    • ‘Inoculant contains millions of these rhizobia bacteria and often comes in the form of a powder.’


1920s: modern Latin, from rhizo- ‘root’ + Greek bios ‘life’.