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Changes in Dehydrogenase and Peroxidase Activities of Aspen Infected with Hypoxylon mammatum. Arthur L. Schipper, Jr., Principal Plant Physiologist, North Central Forest Experiment Station, U.S. Department of Agriculture, Forest Service, Folwell Avenue, St. Paul, Minnesota 55101; Phytopathology 65:440-445. Accepted for publication 6 November 1974. DOI: 10.1094/Phyto-65-440.

Hypoxylon mammatum infection of aspen reduced glyceraldehyde-3-phosphate dehydrogenase activity and increased glucose-6-phosphate dehydrogenase activity. Glucose-6-phosphate dehydrogenase activity and callus formation in wood peaked 4 weeks after wounding in uninoculated trees, but not in inoculated trees. Despite large increases in peroxidase activity, inoculated host tissue did not exhibit resistance to H. mammatum. H. mammatum apparently interferes with wound-healing during the infection stage of parasitism.