Journal Article Action potential Cell-to-cell permeation Chara corallina Chara internodal cells Charaaustralis Characeae Chlorophyll PAM microfluorometry Chlorophyll fluorescence Chlorophyll fluorescence transients Chloroplast membrane transporters Cytoplasmic streaming Electrical Signaling Excitable membranes Hyperpolarizing response K(+)-conductive state Long-distance transport NADPH oxidase Oxygen Pericellular microinjection of H(2)O(2) Photometabolites Plasma membrane H(+)/OH(−) transport Plasma membrane–chloroplast interactions Plasmodesmata Research Support, Non-U.S. Gov't S88TT14065 cytoskeleton mechanical stress oxygen platinum nanoelectrodes