Abstract
Plants of barley (Hordeum vulgare L. cv. Salve) were grown with 6.5–35% relative increase of K+ supply per day (RKR) using a special computer‐controlled culture unit. After a few days on the culture solution the plants adapted their relative growth rate (RGR) to the rate of nutrient supply. The roots of the plants remained in a low salt status irrespective of the rate of nutrient supply, whereas the concentration of K+ in shoots increased with RKR. Both Vmax and Km for K+(86Rb) influx increased with RKR. It is concluded that with a continuous and stable K+ stress, the K+ uptake system is adjusted to provide an effective K+ uptake at each given RKR. Allosteric regulation of K+ influx does not occur and efflux of K+ is very small.
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