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EFFECTS OF MONOVALENT AND DIVALENT CATIONS ON PHOSPHATE ABSORPTION BY BEECH MYCORRHIZAS
Author(s) -
STRULLU D. G.,
GRELLIER B.,
GARREC J. P.,
McCREADY C. C.,
HARLEY J. L.
Publication year - 1986
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1986.tb00626.x
Subject(s) - divalent , phosphate , chemistry , magnesium , calcium , potassium , sodium , inorganic chemistry , beech , polyphosphate , potassium phosphate , nuclear chemistry , botany , biochemistry , chromatography , organic chemistry , biology
SUMMARY The rate of uptake of phosphate from dilute solutions of KH 2 PO 4 by Fagus mycorrhizas was much increased if calcium or magnesium, as chlorides, was added to the solution but not if sodium or potassium was similarly added. No effect on the partition of phosphate between sheath and core was observed but increased uptake was associated with an increase in number and phosphate content of phosphatic (polyphosphate) granules. The P/Ca ratio of the granules was reduced in the presence of calcium and increased in the presence of magnesium. It is concluded that these divalent cations are incorporated into phosphatic granules and that their effect on phosphate uptake is related to the reduction in the soluble phosphate present in the cells rather than to their effects on the cell membranes.