Inorganic sulphur nutrition of the vesicular-arbuscular mycorrhizal fungus Glomus caledonium

Hyphal growth from germinated spores of Glomus caledonium was stimulated in the presence of thiosulphate, metabisulphite, sulphite and sulphate. The largest effects were observed with sulphite and metabisulphite which gave 17- and 11-fold increases respectively at their optimum concentrations. Since no greater incorporation of radioactivity into the spores was observed from ³⁵S-sulphite than from ³⁵S-sulphate it was not possible to conclude how this effect was mediated.