- International Journal of Systematic and Evolutionary Microbiology
- Volume 38, Issue 4
f Numerical Taxonomic Study of Fast-Growing Soybean Rhizobia and a Proposal that Rhizobium fredii Be Assigned to Sinorhizobium gen. nov.
- Authors: W. X. CHEN*, G. H. YAN, J. L. LI
- * Corresponding author.
- Int J Syst Evol Microbiol, October 1988 38: 392-397, doi: 10.1099/00207713-38-4-392
- Subject: Original Papers Relating To Systematic Bacteriology
- Published Online:
A total of 33 strains of fast-growing soybean rhizobia isolated from soil and soybean nodules collected in China and 25 strains belonging to the genera Rhizobium, Bradyrhizobium, and Agrobacterium were compared by numerical taxonomic techniques, using 240 different characters. Our results indicated that all of the strains of fast-growing soybean rhizobia which we examined are closely related (guanine-plus-cytosine content, 59.9 to 63.8 mol%) and are separated from Rhizobium and Bradyrhizobium at the generic level. Based on numerical taxonomy, deoxyribonucleic acid (DNA) base ratio determinations, DNA-DNA hybridization data, serological analysis data, the composition of extracellular gum, bacteriophage typing data, and soluble protein patterns, we propose that the fast-growing soybean rhizobia represent members of a new genus rather than a species of Rhizobium (Rhizobium fredii); we propose Sinorhizobium gen. nov. as an appropriate generic name. The type species of the new genus is Sinorhizobium fredii comb. nov. (basonym, Rhizobium fredii Scholla and Elkan 1984), and the type strain is strain ATCC 35423 (= USDA 205). For the other species we propose the name Sinorhizobium xinjiangensis sp. nov.; the type strain of this species is strain CCBAU 110, which has been deposited in the Beijing Agricultural University Culture Collection, Beijing, People's Republic of China.
Copyright © 1988 International Union of Microbiological Societies | Published by the Microbiology Society
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