Institute of Field and Garden Crops, The Volcani Center, Agricultural Research Organization, P.O. Box 6, Bet-Dagan 50250, Israel.
Plant Physiol. 1991 Apr;95(4):1265-9. doi: 10.1104/pp.95.4.1265.
Maintenance of intracellular K(+) concentrations that are not growth-limiting, in an environment of high Na(+), is characteristic of NaCl-adapted cells of the glycophyte, tobacco (Nicotiana tabacum/gossii). These cells exhibited a substantially greater uptake of (86)Rb(+) (i.e. an indicator of K(+)) relative to unadapted cells. Potassium uptake into NaCl-adapted cells was 1.5-fold greater than unadapted cells at 0 NaCl and 3.5-fold greater when cells were exposed to 160 millimolar NaCl. The difference in net K(+) uptake between unadapted and NaCl-adapted cells was due primarily to higher rates of entry rather than to reduced K(+) leakage. Presumably, enhanced K(+) uptake into adapted cells is a result of electrophoretic flux, and a component of uptake may be linked to vanadate-sensitive H(+) extrusion.
在高钠离子环境中，维持非生长限制的细胞内 K(+)浓度是盐生植物烟草（Nicotiana tabacum/gossii）适应 NaCl 的细胞的特征。这些细胞对 (86)Rb(+)（即 K(+)的指示剂）的摄取量显著高于未适应的细胞。在 0 氯化钠时，适应 NaCl 的细胞对钾的摄取量比未适应的细胞高 1.5 倍，当细胞暴露于 160 毫摩尔氯化钠时，摄取量高 3.5 倍。未适应和适应 NaCl 的细胞之间净 K(+)摄取量的差异主要归因于更高的进入速率，而不是 K(+)泄漏减少。推测，适应细胞中增强的 K(+)摄取是电泳通量的结果，摄取的一个组成部分可能与钒酸盐敏感的 H(+)外排有关。
