SUMMARYNitrogen fertilization of potted Pinus sylvestris L. seedlings growing in forest humus was carried out using two different concentrations of ainmonium sulphate and ammonium chloride, corresponding to 50 and 100 kg N ha~Ĉ enococcum geophilum Fr. mycorrhizas were collected from the root systems of the seedlings and investigated by light and transmission electron microscopy. The number of vacuolar osmophilic bodies in the mantle byphae significantly increased after fertilization witb both atnmonium salts. Tbe bodies were analyzed by electron energy loss speetroscopy. Nitroget-i and phosphorus content increased following ammonium sulphate fertilization, but decreased witb ammonium chloride. Cytoplasmic injury was observed in the byphae in both ammonium chloride treatments but only in tbe higher ammonium sulphate treatment. It is hypothesized that the bodies have a transient storage and N-Hltering function.
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