Abstract
Several strains ofRhizobium trifolii were tested for their ability to synthesize and utilize phenolate or hydroxamate types of siderophores. None of the nodulating strains ofR. trifolii was able to produce detectable amounts of siderophores. Only the non-nodulating strainR. trifolii AR6 formed a phenolate siderophore, which stimulated the growth of the siderophore-negative mutant AR65. Other strains ofR. trifolii could not utilize iron from exogenously supplied Desferal, pseudobactin or citrate. The siderophore fromR. trifolii AR6 and 2,3-dihydroxybenzoic acid slightly stimulated the growth of someR. trifolii strains.
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