Recent data indicate that the slow-growing, non-acid-producing root nodule bacteria of leguminous plants should be separated from the fast-growing, acid-producing strains and placed in a new genus. The separation is warranted by numerical taxonomy, deoxyribonucleic acid base ratio determinations, nucleic acid hybridization, ribosomal ribonucleic acid cistron similarities, serology, composition of extracellular gum, carbohydrate utilization and metabolism, bacteriophage and antibiotic susceptibilities, protein composition, and types of intracellular inclusion bodies in the bacteroid forms. The name proposed for the new genus is . The type species of the genus is (Buchanan 1980) comb. nov. (basonym: Buchanan 1980), the type strain of which is ATCC 10324.


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