Studies on the rot of onion bulbs by Aspergillus niger

Productions of oxalic acid and enzyme by A. niger

Abstract

Aspergillus niger isolated from decayed onion bulb produced oxalic acid in a high concentration on potato sucrose or Czapek broth by shake culture. A crude enzyme extracted from onion bulbs which were decayed by the inoulation with A. niger possessed macerating activity to onion bulbs. The activity was stimulated by the mixture of oxalic acid and crude enzyme.