ZINC TOLERANCE OF MYCORRHIZAL <i>BETULA</i>

Abstract

S ummary Seedlings of Betula spp. were grown in conjunction with isolates of Amanita muscaria Hooker and Paxillus involutus Fr. under aseptic conditions. Mycorrhizas were established in sterilized peat and vermiculite to which nutrient media had been added. Zinc was supplied at various levels and growth of the host was assessed after eight weeks. The mycorrhizas increased the tolerance to Zn of both tolerant and non‐tolerant Betula . This was coupled with a reduction in the translocation of zinc to the shoots of Betula , but an accumulation of zinc in the mycorrhizas.