The estimated pore diameter for plasmodesmal channels in the Abutilon nectary trichome should be about 4 nm, rather than 3 nm

Abstract.

By injecting varous-size fluorescent probes into Abutilon striatum Dicks nectary trichomes, Terry and Robards (1987, Planta 171: 145–157) arrived at an estimate of 3 nm for the physical diameter of the channels involved in cell-to-cell movement. However, their calculations contain an arithmetic error in the volume assumed for the cell into which the probes diffused. (The actual volume is ten times larger.) The corrected calculations give a physical diameter of about 4 nm.