Rapid Hormone-induced Hyperpolarization of the Oat Coleoptile Transmembrane Potential 1

AUTOR(ES)

Cleland, Robert E.

RESUMO

The effects of the plant growth substances indoleacetic acid (IAA) and fusicoccin on the transmembrane potential of Avena coleoptile cells (at 27-29 C) were studied. Fusicoccin caused hyperpolarization of the membrane potential which started after a lag of less than 20 seconds, and which on average reached −49 mv at an external K+ concentration of 1 mm and −75 mv at 0.1 mm K+. IAA caused a hyperpolarization of −25 mv starting after a lag of 7 to 8 minutes. These results suggest that fusicoccin and IAA both activate electrogenic H+ extrusion.

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