Electron Microscopy and Electrophysiology of Local Cell Wall Formation in Chara corallina

概要

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The formation of fibrillar and amorphous local wall appositions induced by wounding and treatment with chlortetracycline (CTC) was studied in internodal cells of Chara corallina. Wounding causes a transient depolarisation of the membrane and a transient increase in membrane conductance. The formation of a fibrillar, cellulosic wound wall starts after the cell wall lesion has been plugged by vacuolar crystals and cytoplasmic inclusions. At that time both membrane potential and membrane conductance have recovered their normal values. CTC induces a persistent electrophysiological response and formation of the amorphous, callose-containing wall takes place at low (more positive) membrane potential and low membrane resistance, suggesting an increased passive membrane permeability. The electrophysiological changes increase with the Ca^<2+> concentration of the CTC solution. The relevance of the membrane potential for the formation of local wall appositions is discussed.
日本植物生理学会の論文