Deoxyribonucleic acid homologies were determined between five fast-growing soybean-nodulating strains from the People's Republic of China and other rhizobia. Type strains ATCC 14480, ATCC 9930, ATCC 14482, ATCC 10004, and ATCC 10324 were used to represent recognized species. sp. () strain ATCC 10319, the type strain of the former species , and sp. strain 3G4b5 were also included. The fast-growing soybean-nodulating strains had low levels of deoxyribonucleic acid homology with the type strains studied (5 to 43%). The fast-growing soybean-nodulating strains studied constitute at least two distinct deoxyribonucleic acid homology groups.


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