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The effects of abscisic acid (ABA) on growth, uptake and translocation of potassium ions, K+ ,Mg2+ -ATPase activity and transpiration were investigated in young wheat ( Triticum aestivum L. cv. Martonvásári-8) plants grown at different K+ supplies. Long-term treatment with ABA (10 μ M ) reduced growth in high-K+ plants, but had less effect under low-K+ conditions. K+ (86 Rb) uptake was inhibited by about 70 and 40% in low- and high-K+ plants, respectively. The stimulation by K+ of the Mg2+ -ATPase activity in the root microsomal fraction was lost with ABA treatment. It is suggested that the inhibitory effect of ABA on K+ uptake may be related to this effects on the K+ ,Mg2+ -ATPase. Translocation of K+ to the shoot was inhibited in low-K+ plants only, and it was not affected in high-K+ plants. In parallel to this, ABA treatment reduced transpiration by about 50% in low-K+ plants, whereas a much smaller effect was seen in high-K+ plants. These observations suggest that the regulation by ABA of the stomatal movements is strongly counteracted by high-K+ status. 相似文献