Abstract
Ca2+ stimulates 1-aminocyclopropane-1-carboxylic acid (ACC)- and indole-3-acetic acid (IAA)-dependent ethylene production in mung bean hypocotyls and senescing cucumber cotyledons. This stimulation is much greater in the presence of ACC than IAA. ACC content of hypocotyls also increases markedly with increasing Ca2+ concentration. Ca2+ stimulation with IAA occurs only after 4 h and may be dependent on new ACC being produced following auxin activation. Stimulation by Ca2+ with both ACC and IAA increases with temperature from 20° to 35°C, and also occurs with high internal levels of Ca2+.
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