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Environmental and Stress Physiology

Electrical Potentials during Gravitropism in Bean Epicotyls

Department of Electronics, Faculty of Engineering, Kyushu University 36, Fukuoka 812, Japan, Department of Electric Engineering, Faculty of Engineering, Kinki University in Kyushu, Iizuka 820, Japan

An apparatus for measuring simultaneously the surface electrical potentials along epicotyl was developed to study the largely bending situation by gravity. Potentials increased on the upper side and decreased on the lower side after the horizontal placement. The time course of electrical changes consisted of two components which correspond to growth movements observed during gravitropism.