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Electrophysiological procedures were used to evaluate cellular responses of fern (Onoclea sensibilis L.) gametophytes to photomorphogenetically active light. Red, far red, and blue light caused rapid changes in the membrane potential of the apical cell of the gametophyte filament; other cells in the filament were not similarly responsive. Measurements made with one electrode in the apical cell revealed that the membrane potential depolarized in red light and repolarized in far red light. Irradiation with blue light caused a hyperpolarization, the rapidity of which was dependent on a red light pretreatment. More refined measurements with one electrode in the tip of the apical cell and another in the base of the cell showed that both red and blue light treatments cause the apical cell to behave as a dipole. Because of the profound, long-term morphological changes that follow light irradiation in this organism, it was hoped to use it to elucidate the role that electrical parameters play in determining subsequent developmental events.

Electrical Changes in the Apical Cell of the Fern Gametophyte during Irradiation with Photomorphogenetically Active Light