Abstract
The effect of streaming speed on intercellular transport of chloride has been studied using pairs of internodal cells of Chara. The rate of transport was measured by that fraction of the chloride that entered one internode which was transported out of it into the cells of the node and the next internode. The speed of cytoplasmic streaming was altered by treating the first cell with cytochalasin B. The relative rate of intercellular transport depended markedly on the streaming speed at all speeds up to those found in untreated cells. The chloride influx into the treated cell did not depend on the streaming speed. It is concluded that the rate of intercellular transport of low molecular weight solutes in Chara will be normally limited by the rate at which cytoplasmic streaming brings solute to the plasmodesmata, rather than by the diffusion permeability of the plasmodesmata. This conclusion may well apply to other charophyte plants, and could in principle apply to higher plants.
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