Metabolic Effects on Ion Fluxes inTolypella intricata

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Abstract
The uptake of C1 ions by cells of Tolypella intricata is greatly increased by light, and must be an active process. K ions in the cells (at 90–110 mM concentration) are in approximate electrochemical equilibrium with the external solution, but the K influx is affected (directly or indirectly) by cellular metabolism. The K influx is increased by light, and the increase is greater in the presence of C1 than when C1 is removed from the solution. K uptake is inhibited by chemicals which also inhibit the C1 pump.It is suggested that light increases the permeability of the plasmalemma to K, but there must also be links between K and C1 uptake. The possible nature of these links is discussed.The internal Na concentration (3–10 mM) is considerably below the expected equilibrium concentration, but the Na influx is also very low (and is not increased by light). The permeability of the plasmalemma to Na is thus very low, and there can be little active extrusion of Na under normal conditions.

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