NOTES: Transfer of Rhizobium japonicum Buchanan 1980 to Bradyrhizobium gen. nov., a Genus of Slow-Growing, Root Nodule Bacteria from Leguminous Plants
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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, and the name proposed is Bradyrhizobium.Abstract:
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 Bradyrhizobium. The type species of the genus is B. japonicum (Buchanan 1980) comb. nov. (basonym: Rhizobium japonicum Buchanan 1980), the type strain of which is ATCC 10324.read more
Citations
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Fatty Acids, Antibiotic Resistance, and Deoxyribonucleic Acid Homology Groups of Bradyrhizobium japonicum
TL;DR: The fatty acid compositions and multiple antibiotic resistance patterns of 32 strains of Bradyrhizobium japonicum correlated with two major deoxyribonucleic acid homology groups, whereas group II strains were resistant to these antibiotics.
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A revision of Rhizobium Frank 1889, with an emended description of the genus, and the inclusion of all species of Agrobacterium Conn 1942 and Allorhizobium undicola de Lajudie et al. 1998 as new combinations: Rhizobium radiobacter, R. rhizogenes, R. rubi, R. undicola and R. vitis.
TL;DR: The species of Agrobacterium, Allorhizobium, and Sinor-Hizobiam were amalgamated into a single genus, RHZobium as discussed by the authors, based on 16S rDNA analyses.
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Phylogeny of the phototrophic rhizobium strain BTAi1 by polymerase chain reaction-based sequencing of a 16S rRNA gene segment.
TL;DR: The sequence from BTAi1 and that from the free-living phototroph Rhodopseudomonas palustris both fall within the range of variation found among strains of the soybean symbiont Bradyrhizobium japonicum, suggesting that it would be appropriate to include all of these organisms in a single genus.
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Phylogenies of atpD and recA support the small subunit rRNA-based classification of rhizobia.
TL;DR: Part of the atpD and recA genes have been sequenced for 25 type strains within the alpha-Proteobacteria, showing good support for a Rhizobium clade that includes Agrobacterium tumefaciens, and the very close relationship between Agrobacteria rhizogenes and RhizOBium tropici is confirmed.
References
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Approved lists of bacterial names
TL;DR: A review of the currently valid names of bacteria is conducted with the object of retaining only names for those taxa which were adequately described and cultivable, for which there was a Type, Neotype, or Reference strain available.
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Nitrogen fixation by Rhizobium cultured on a defined medium
TL;DR: Several plant metabolites, including sugars known to favour rhizobial growth and citric acid cycle intermediates, were examined for their effect on this latter system and as possible direct inducers of nitrogenase activity in cultured rhizobia.
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Symbiosis between Rhizobium and the Non-legume, Trema aspera
TL;DR: In this paper, Trema aspera decaisne plants growing between rows of tea in the Pangia District of New Guinea showed abundant nodulation, similar to the nodules found on many tropical legumes.
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The Application of Computer Techniques to the Taxonomy of the Root-nodule Bacteria of Legumes
TL;DR: The results obtained for the genus Rhizobium indicate the need for major taxonomic changes and the creation of a new genus Phytomyxa to contain strains of slow-growing root-nodule bacteria is also proposed.
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Acetylene reduction by Rhizobium in pure culture
TL;DR: This work has found that at least one strain of Rhizobium will do so when cultured alone on certain media and confirmed the ability of legume callus cultures to fix nitrogen.