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PMID: 8494746 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Reclassification of American Rhizobium leguminosarum biovar phaseoli type I strains as Rhizobium etli sp. nov.

International journal of systematic bacteriology ·Vol. 43 ·No. 2 ·1993-04-00 ·Pages 374-7

Segovia L, Young JP, Martínez-Romero E

Abstract

A new Rhizobium species that nodulates Phaseolus vulgaris L. is proposed on the basis of a sequence analysis of 16S ribosomal DNA. This taxon, Rhizobium etli sp. nov., was previously named Rhizobium leguminosarum biovar phaseoli (type I strains) and is characterized by the capacity to establish an effective symbiosis with bean plants, the reiteration of the nitrogenase structural genes, the organization of the common nodulation genes into two separate transcriptional units bearing nodA and nodBC, the presence of the polysaccharide inhibition gene, psi, and the 16S ribosomal DNA sequence. An analysis of the sequence of a fragment of the 16S rRNA gene shows that this gene is quite different from the gene of R. leguminosarum. In addition, all R. etli strains have identical sequences. We describe these analyses and discuss additional evidence supporting our proposal.

MeSH Terms
Base Sequence DNA, Bacterial/genetics DNA, Ribosomal/genetics Molecular Sequence Data Phylogeny RNA, Ribosomal, 16S/genetics Rhizobium leguminosarum/classification,genetics Sequence Analysis, DNA Sequence Homology, Nucleic Acid
Chemicals
DNA, Bacterial DNA, Ribosomal RNA, Ribosomal, 16S
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Segovia L
Departamento de Genética Molecular, Universidad Nacional Autónoma de México, Cuernavaca, Morelos.
Young J P
Martínez-Romero E
Article Info
Journal
International journal of systematic bacteriology
Abbr.
Int J Syst Bacteriol
ISSN
0020-7713
DOI
10.1099/00207713-43-2-374
Published
1993-04-00
Pages
374-7
Language
English
Region
England
NLM ID
0042143
Subset
IM
Databases
GENBANK
M11223, M11927, M13695, M34127, M34129, M53855, M55233, M55234, M55235, M55236, M55242, M55243, M55485, M55486, M55487, M55489, M55491, M55492, M55494, M55496, M74163
External Links
PubMed source DOI: 10.1099/00207713-43-2-374
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