caa a22 4500 477110878 CHVBK 20180405111608.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00035054 doi (NATIONALLICENCE)springer-10.1007/BF00035054 Young J. Department of Biology, University of York, P.O. Box 373, YO1 5YW, York, UK aut Phylogeny and taxonomy of rhizobia [Elektronische Daten] [J. Young] Rhizobia are bacteria that form nitrogen-fixing nodules on the roots, or occasionally the shoots, of legumes. There are currently more than a dozen validly named species, but the true number of species is probably orders of magnitude higher. The named species are listed and briefly discussed. Sequences of the small subunit ribosomal RNA (SSU or 16S rRNA) support the well-established subdivision of rhizobia into three genera: Rhizobium, Bradyrhizobium, and Azorhizobium. These all lie within the alpha subdivision of the Proteobacteria, but on quite distinct branches, each of which also includes many bacterial species that are not rhizobia. It has been clear for several years that Rhizobium, on this definition, is still too broad and is polyphyletic: there are many non-rhizobia within this radiation. Recently, therefore, it has been suggested that this genus should be split into four genera, namely Rhizobium (R. leguminosarum, R. tropici, R. etli), Sinorhizobium (S. fredii, S. meliloti, S. teranga, S. saheli), Mesorhizobium (M. loti, M. huakuii, M ciceri, M. tianshanense, M. mediterraneum), and a fourth, unnamed, genus for the current R. galegae. The evidence and pros and cons are reviewed. Kluwer Academic Publishers, 1996 Azorhizobium nationallicence Bradyrhizobium nationallicence Mesorhizobium nationallicence phylogeny nationallicence Rhizobium Sinorhizobium nationallicence species nationallicence taxonomy nationallicence Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl 186/1(1996-09-01), 45-52 0032-079X 186:1<45 1996 186 11104 https://doi.org/10.1007/BF00035054 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00035054 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Young J. Department of Biology, University of York, P.O. Box 373, YO1 5YW, York, UK aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl/ 186/1(1996-09-01), 45-52 0032-079X 186:1<45 1996 186 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer