Oxidized oligogalacturonides activate the oxidation of indoleacetic Acid by peroxidase.
Partial hydrolysis of polygalacturonic acid with a purified alpha-1,4-endopolygalacturonase yielded oligogalacturonides and trace amounts of a series of modified oligogalacturonides. Three of the minor products were isolated and identified as oxidized oligogalacturonides possessing termini of galactaric acid. Oxidation of indole-3-acetic acid by peroxidases was activated by oxidized oligogalacturonides but not by normal analogs.
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U.S. Department of Agriculture, Agricultural Research Service, Richard B. Russell Research Center, P. O. Box 5677, Athens, Georgia 30613.