Light-induced Electric Potentials of Intact Anthoceros Chloroplasts and Their Modification in the Presence of the Energy Transfer Inhibitor tentoxin

Abstract

Summary The photoelectric response of intact Anthoceros chloroplasts in situ was investigated using micro-electrode technique. The biphasic potential curve of dark-adapted chloroplasts could be modified by short preillumination. Tentoxin, a cyclic tetrapeptide known as energy transfer inhibitor, did not influence neither the biphasic character of the light-induced response nor the potential decay time constant τ in the dark. It prevented the transient undershoot which occurs during the potential decay after the end of illumination and led to some irregularities in the shape of the light-induced potential curve. The results are discussed in relation to possible tentoxin actions.