Observations reveal greater density of labelling in 'thick' cell walls of heat-shocked radicles.
We observed that the 'thin' cell walls have gold label at the plasmalemma membrane, whereas in the thicker walls label is observed within the wall. Different biochemical composition of thicker walls may be the cause of this differential labelling. The cytoplasmically dense cell types are those cells typically engaged in rapid cell division and therefore meristematic. Figure 1 .