Metabolic properties, maximum growth temperature and phage sensitivity of Rhizobium sp. (Galega) compared with other fast-growing rhizobia |
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Authors: | Kristina Lindström Sirkka Lehtomäki |
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Institution: | Department of Microbiology, University of Helsinki, Helsinki, Finland |
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Abstract: | Abstract Rhizobium strains nodulating Galega species were characterized by metabolic tests, maximum growth temperature determinations in a temperature gradient incubator and phage typing, and compared with other fast-growing rhizobia. By numerical taxonomy it was shown that the Galega Rhizobium strains are closely related to each other and unrelated to the recognized species of Rhizobium . The maximum growth temperature of rhizobia nodulating G. orientalis was 33.0–34.0°C and of rhizobia nodulating G. officinalis 35.0–37.0°C. The Galega rhizobia were only lysed by their own phages, and not by typing phages for other Rhizobium species. The G + C% of Rhizobium sp. ( Galega ) strainswas 63%.44 previously unclassified fast-growing rhizobia from tropical plants, which were included in the experiments, were shown to form a heterogenous group with diverse properties. The results confirm and extend previous findings, and suggest that Rhizobum sp. ( Galega ) should be considered a new species of Rhizobium . |
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Keywords: | G + C% Numerical taxonomy Phage typing Rhizobium sp (Galega) |
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