VIEW ARTICLE

Effect of Pectin Source and Sugars on Polygalacturonase Production by Ceratocystis ulmi. W. L. Biehn, Assistant Plant Pathologist, Department of Plant Pathology and Botany, The Connecticut Agricultural Experiment Station, New Haven 06504; A. E. Dimond, Chief, Department of Plant Pathology and Botany, The Connecticut Agricultural Experiment Station, New Haven 06504. Phytopathology 61:745-746. DOI: 10.1094/Phyto-61-745.

Polygalacturonase (PG) production by Ceratocystis ulmi was more than 50 times greater on an ethanol-insoluble fraction from green elm shoots than on citrus pectin. Glucose (0.1 m) repressed PG production by C. ulmi 80-99% on an ethanol-insoluble fraction from green elm shoots and on citrus pectin; while galacturonic acid (0.05 m) reduced PG production 70-85%.