PHOSPHATE ACCUMULATION IN FAGUS MYCORRHIZAS

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Summary

The quantities of polyphosphate formed in beech mycorrhizas during uptake of KH232PO4 were estimated after extraction with cold TCA and KOH. Over an absorption period of 19 h the proportion of absorbed phosphate converted into polyphosphate increases with external phosphate concentration from 22% in 0·16 mM to 44% in 0·98 mM KH2PO4. Uptake from 64 mM phosphate results in 39 % being accumulated as polyphosphate during 2·5 h. Calculations based on the percentage of phosphate accumulated in the sheath, obtained by dissection, show that a large fraction of the phosphate in the fungus is accumulated as polyphosphate.

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