title: Enhanced Net K Uptake Capacity of NaCl-Adapted Cells.
abstract: 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.
authors: Institute of Field and Garden Crops, The Volcani Center, Agricultural Research Organization, P.O. Box 6, Bet-Dagan 50250, Israel.
authors: A E
authors: AE
authors: Watad
authors: M
authors: M
authors: Reuveni
authors: R A
authors: RA
authors: Bressan
authors: P M
authors: PM
authors: Hasegawa