Abstract
Investigation of three systems producing ethylene from 4-methylmercapto-2-oxobutyric acid in the presence of peroxidase has shown that the addition of indolyl-3-acetic acid (IAA) to two of them increases the amount of ethylene produced and is essential for the third. The system investigated in the present paper produces ethylene from the oxo acid in the presence of peroxidase, p-hydroxybenzoate, IAA and sulphinic acid. Of these components only sulphinic acid inhibits the oxidation of IAA, but no ethylene is produced in its absence. Indolyl-3-acetic acid leads to the production of ethylene by reason of its ability to initiate the oxidation of the sulphinic acid which in turn causes the breakdown of the oxo acid.
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