Fatty acid composition of Rhizobium spp.

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Abstract
The fatty acid composition of 42 isolates belonging to the major plant affinity groups of Rhizobium has been determined and found to vary reproducibly with culture age. Numerical taxonomic techniques applied to the 15 major fatty acid components of log-phase cultures of comparable physiological age showed that the rhizobia constitute a uniform group. However, two clusters comprising soybean–cowpea isolates and pea–bean isolates were evident. These observations, based on a simple analysis of only one group of chemical components, indicate relation ships among rhizobia which differ from the conventional plant-affinity groupings but which are consistent with other proposed relationships established using a variety of biochemical and physiological criteria.

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