Abstract
1. The souna part of sweet potatoes injured by Geratostometla fmbriata increasec its respiration amounts from two to three times more than the control.
2. As for the oxygen absorption curves. Okinawa No. 100 showed a line a little ascending, while Norin No. 1 gave clearly a descending one. The results mean that the former was slower than the latter in forming wound tissue at the cut surface.
3. The respiration quotient (R. Q.) of the sound part of rotted sweet potatoes was about 1.0, but that of the fungus itself which grew on steamed sweet potatoes was 1.1_??_1.2.
4. It is assumed that the respiration of rotted sweet potatoes may be increased through the following processes: (1) the protoplasm of the tissue was subjected to the colloid chemical changes by the penetration of the fungus, (2) the respiratory enzymes such as oxidase, peroxidase, and cytochrome oxidase were activated, and the respiration was increased by them, and (3) by the energy resulted from the above processes, both the enzymes concerning the regpirations and the intermediate substances such as polyphenols and vitamin C were synthesized.
