Diversity in the nutritional requirements of strains of various Rhizobium species |
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| Authors: | Sukrita Chakrabarti Michele S Lee Alan H Gibson |
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| Institution: | C.S.I.R.O., Division of Plant Industry, P.O. Box 1600, Canberra City, A.C.T. Australia |
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| Abstract: | An examination of 85 strains of bacteria from five species of rhizobia (Rhizobium sp., R. japonicum, R. lupini, R. meliloti and R. trifolii), using a new semi-quantitative assay procedure, disclosed wide diversity among the strains in their requirement for, and response to, vitamins, carbon sources, and nitrogen sources. Approximately half of the strains in the first four species grew as well without vitamins as they did when supplied with a vitamin mixture or with yeast extract, but the other strains showed considerable variation in their requirements. Some strains were inhibited by yeast extract, or showed best growth in basic media supplemented with only one vitamin. The strains within the species differed widely in their utilization of gluconate, mannitol and arabinose as C-sources; there was less diversity in their use of glutamine, histidine, NH4+-N and NO3?-N as N-sources. The significance of these observations in the culture of rhizobia in the laboratory, in their ecological adaptation to particular environments, and in their ability to form an effective symbiosis with particular host legumes, is discussed. |
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