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Fig. 4. Dendogram derived from the analysis of fingerprint patterns showing the diversity among clover-nodulating Rhizobium recovered from nodules present on indigenous plants in the low metal soil (Group A), in the high metal soil (Group B) or from nodules present on plants used to determine the most probable number of Rhizobium in the high metal soil (Group C). The dendogram, based on the molecular distances between isolates, was produced by the minimum spanning tree method (Rohlf, 1973).
