Rates of Axial Transport of11C and14C in Characean Cells: Faster than Visible Streaming?

Publisher Website
Google Scholar
Abstract
Movements of 11C and 14C in N. translucens occur at rates two to five times greater than those of visually observed streaming. Like cytoplasmic streaming, longitudinal tracer movement is stopped reversibly by action potentials, irreversibly by N-ethylmaleimide (NEM) and is unaffected by colchicine (colch), suggesting that both processes share a common mechanism. Colchicine causes an increased loading delay time. In both N. translucens and C. corallina the activity of 11C and 14C at the nodes shows a sharp discontinuity: it is low on the feed side of the node and high at the node itself. This suggests that transport across plasmodesmata may be active.