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Bradyrhizobium is a genus of gram-negative bacilli (rod shaped) originally described by Jordon in 1982 (Kuykendall, 2005). Bradyrhizobium bacteria tend to live in the soil and form symbiotic relationships with various legume plants such as soybeans, flowering plants, clover, peanuts, and beans. The symbiotic relationship is established as the bacteria fix atmospheric nitrogen into ammonia, a process not found in their plant hosts, in exchange of essential carbohydrates for bacteria survival. Therefore, Bradyrhizobium species are also classified as nitrogen-fixing bacteria and are known to reside in nodules (roots of legume plants). The Bradyrhizobium genus currently consists of nine rhizobia species and one non-rhizobia species (B. betae).
- B. canariense
- B. denitrificans – formally Blastobacter denitrificans
- B. elkanii
- B. iriomotense
- B. japonicum – formally Rhizobium japonicum
- B. jicamae
- B. lianingense
Provided by the current taxonomy of rhizobia webpage at this link below.