Abstract
Uptake of 24Mg by excised roots of Pinus sylvestris L. during up to 4 h long incubations in 99.9 atom % 24Mg (50 μM) was measured by ICP-MS. A rapid initial uptake phase (30 min) was followed by a slower uptake. This was interpreted as a shift from a phase dominated by saturable ion exchange (free space uptake), to a non-saturable phase, during which the rate of uptake was 0.077±0.0.012 μmol Mg g−1 (d.wt.) h−1. The metabolic uncoupler DNP (2,4-dinitrophenol) at 50 μM decreased the Mg uptake rate by 35% only, but the effect of DNP was significant (p<0.01). Several problems related to a high variability in the experimental material were encountered, and further refinement of this approach in studies of plant Mg uptake is suggested.
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Högberg, P., Jensén, P., Näsholm, T. et al. Uptake of 24Mg by excised pine roots: A preliminary study. Plant Soil 172, 323–326 (1995). https://doi.org/10.1007/BF00011334
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DOI: https://doi.org/10.1007/BF00011334