Summary
In excised roots of barley and tomato plants, lowering the water potential of nutrient solutions to-10.4 and-20.4 atm decreased the uptake of bromide and phosphorus while increasing the loss of these ions to the external solutions.
Lowering the water potential greatly increased the rate of loss of potassium and bromide from the cytoplasm, but the increases in loss from the vacuoles were much smaller. The results suggest that the mechanisms of ion uptake are not affected by low water potential and that the decrease in ion accumulation is caused by the increased leakage from the cells.
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Greenway, H., Klepper, B. & Hughes, P.G. Effects of low water potential on ion uptake and loss for excised roots. Planta 80, 129–141 (1968). https://doi.org/10.1007/BF00385588
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DOI: https://doi.org/10.1007/BF00385588