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The effect of aluminium on phosphate uptake by three isolated ectomycorrhizal fungi

Three ectomycorrhizal fungi, Laccaria bicolor, Lactarius hepaticus and Lactarius rufus, were grown in liquid medium for 2 weeks and used in short-term phosphate (P) uptake studies. At phosphate concentrations ranging from 1 to 100 μM the fungi exhibited a single affinity phase. The kinetic parameter...

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Bibliographic Details
Published in:Plant and soil 1992-02, Vol.140 (2), p.167-174
Main Authors: JONGBLOED, R.H., TOSSERAMS, M.W.A., BORST-PAUWELS, G.W.F.H.
Format: Article
Language:English
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Summary:Three ectomycorrhizal fungi, Laccaria bicolor, Lactarius hepaticus and Lactarius rufus, were grown in liquid medium for 2 weeks and used in short-term phosphate (P) uptake studies. At phosphate concentrations ranging from 1 to 100 μM the fungi exhibited a single affinity phase. The kinetic parameters for P uptake differed between species with Km varying from 1.5 to 13.1 μM. Vmax also depended on the buffer that was applied. P uptake by the fungi was severely reduced by aluminium (Al). This could be ascribed mainly to the complexing of phosphate by Al³⁺. Correcting for this decrease in phosphate concentration, the P uptake by both Lactarius hepaticus and Laccaria bicolor was only slightly inhibited by Al, while P uptake by Lactarius rufus was even stimulated. The latter may be attributed to a reduction in surface potential caused by the trivalent Al cation, which in turn increases the concentration of the negatively charged phosphate ion in the near-membrane region.
ISSN:0032-079X
1573-5036
DOI:10.1007/BF00010594