Abstract
Summary The effect of tentoxin, an energy transfer inhibitor produced by the phytopathogenic fungus Alternaria alternata, and of its natural derivative, dihydrotentoxin, on the membrane potential of leaf cells of the fresh-water plant Egeria densa was investigated. Tentoxin reversibly depolarizes the membrane potential in the light down to its dark level after a lag-phase of some 10 min. A second application of the phytotoxin shortens this lag-phase considerably. Dihydrotentoxin also depolarizes the membrane potential, but less effectively. In the dark, no influence on the PD of both substances could be observed. Fusicoccin repolarizes the membrane in the presence of tentoxin or dihydrotentoxin or, when first added, suppresses the toxin-induced response. Tentoxin as well as d1hydrotentoxin lower the ATP content of Egeria leaves significantly. The tentoxin action on the cell potential is discussed as a result of inhibition of photophosphorylation.
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