抄録
Cassava roots easily deteriorate after harvest. Pruning treatment (all leaves and stems are cut awayexcept for about 30-cm-high stems and the stems and roots are left for 2 weeks or more before harvest) delays occurrence of the deterioration. Activities of L-phenylalanine ammonia-lyase, peroxidase, and acid invertase and coumarin content developed during incubation in all parts of 1.5 cm thick root tissue blocks prepared from the pruned and unpruned plants, but were lower in the former. Activities of the enzymesand coumarin content in the intact root from the pruned plant were lower than in the tissue block from the pruned plant and were less than in the intact root from the unpruned plant. In the latter case, the level of activities was highest in the intervening parts of the root, in which physiological deterioration was induced.
