Abstract
In the present investigation, organic acids as metabolic products in the culture filtrates of Phytophthora infestans were examined by the method of paper chromatography and microchemistry.
1. As a non-volatile organic acid, oxalic acid and succinic acid are recognized in the filtrate of asparagine-glucose medium and potato decoction, and oxalic acid in that of Waksman's medium.
2. As a volatile organic acid, no organic acid has been detected by the method of paperchromatography, whereas the existence of a small quantity of acetic acid and formic acid has been confirmed by the microchemical method in the filtrates of asparagine-glucose medium and potato decoction.
3. The principal acid of these organic acids produced by Phytophthora infestans was found to be oxalic acid.
