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COMPARTMENTATION AND LOW TEMPERATURE FLUXES OF POTASSIUM IN MYCELIUM OF DENDRYPHIELLA SALINA
Author(s) -
JENNINGS D. H.,
AYNSLEY J. S.
Publication year - 1971
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.1469-8137.1971.tb02572.x
Subject(s) - potassium , mycelium , sodium , efflux , chemistry , calcium , nuclear chemistry , botany , radiochemistry , biochemistry , biology , organic chemistry
S ummaryDendryphiella salina was grown at 21° C in two media, identical except that one contained potassium labelled with 42 K. The cultures were transferred to 2° C, the fungus separated from the medium, the radioactive mycelium placed in the non‐radioactive medium and the efflux of 42 K measured. Under these conditions the rate of dry weight increase is reduced by at least 75%. The fungus behaves as a multicompartment system with regard to potassium with at least 75% of the ion being in the slowest‐exchanging compartment. The efflux from this compartment into a medium containing 2.5 mM potassium is of the order of 0.14 p moles cm −2 sec −1 , being at least doubled when 50 mM sodium is present. Addition of 10 mM calcium in the presence of sodium reduces the efflux to a value close to that obtained when sodium is absent.