Iron metabolism by an ectomcorrhizal fungus,Cenococcum graniforme

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Abstract
When Cenococcum graniforme is grown in submerged culture where iron is not a limiting nutrient, ‘reductants’ are released which will reduce Fe(111). Of the two ‘reductant’ responses observed, one is associated with the reduction of unchelated Fe(111) and the second reduces iron from ethylenediaminetetraacetate. With iron supplied as Fe citrate, ferrichrome A, Fe salts, Fe ethylenediaminetetraacetate or Fe diethylenetriaminepentaacetate, all cultures produced ‘reductant’ for unchelated Fe(111); however, only cultures grown in the presence of ethylenediametetraacetate or diethylenetriaminepentaacetate would reduce chelated iron. Transport of iron into the cells was found to be a Fe(11) system which was energy dependent and displayed saturation kinetics. Purified cell walls of C. graniforme will bind Fe(11) and these cell walls could serve as a potential source of iron to the adjacent cells.