Some properties of arctic rhizobia |
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Authors: | Suzanne Caudry-Reznick Danielle Prevost Herbert M Schulman |
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Institution: | (1) Lady Davis Institute, Jewish General Hospital, 3755 Cote Ste-Catherine Road, H3T 1E2 Montreal, Quebec, Canada;(2) Station de Recherche, Agriculture Canada, Sainte-Foy, Quebec, Canada |
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Abstract: | Forty-eight strains of Rhizobium isolated from the root nodules of three species of legumes indigenous to the high tundra (Astragalus alpinus, Oxytropis maydelliana andOxytropis arctobia) are phenotypically heterogenous with respect to intrinsic antibiotic resistance, expression of nitrogenase activityex planta and plasmid content. All of the strains possess a 250–300 kb plasmid and are homologous to each other on the genomic DNA level but have little DNA homology with selected reference strains of well characterized species of rhizobia. The arctic rhizobia have an optimum growth temperature of 23°C and can grow slowly at 5°C. The DNA from four of the isolates, which were selected for detailed investigation, have sequences homologous tonif andnod genes fromRhizobium trifolii. |
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Keywords: | Arctic rhizobia Arctic legumes Nitrogen fixation |
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