Abstract
The dependence of IAA-induced ethylene production was studied in etiolated coleoptile sections of wheat. Ethylene production under various conditions was compared with the elongation growth of coleoptile sections. Our results do not agree with the statement made by Goldwin and Wain (1973) that ethylene production is a direct consequence of rapid cell growth. For example, at low IAA concentrations, water stress promoted ethylene production although the elongation growth of coleoptiles was inhibited. Proceeding from new ideas on the effect of IAA and water stress on metabolism, the hypothesis is deduced that both high IAA concentrations and water stress reduce cytoplasmatic p H. In dependence on the maintenance of energy metabolism, this acidification of cytoplasm is claimed to be responsible for the stimulation of ethylene production.
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