The cytokinin receptor LHK1 (Lotus Histidine Kinase 1) is necessary for nodule formation during the development of rhizobia-legume symbiosis.
Rhizobia, a type of soil bacteria that fixes nitrogen, can coexist symbiotically with legumes. This rhizobia-legume symbiosis causes nodules to grow on the plant roots, where the bacteria may transform atmospheric nitrogen into plant-useable ammonia. Rhizobia are soil microorganisms that can collaborate with legume plants to create root nodules that are conducive to bacterial nitrogen fixation. Legumes enable the growth of extremely large rhizobia populations close to their roots.
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