Abstract
Potato (Solanum tuberosum) suspension cultures were used as a model to obtain basic information regarding the occurrence of enzymatic browning reactions. The cultures were subjected to chitosan, an established stress factor, at concentrations from 2.5 to 100 μg/mL to examine stress reactions and to pressure treatments from 100 to 400 MPa for 10 min at 25 °C to monitor the impact of minimal processing on plant systems. The release of hydrogen peroxide from chitosan or high- pressure-treated potato cells, which constitutes an initial stress response, was correlated with activities of phenylalanine ammonia-lyase (PAL), peroxidase (PO), and polyphenol oxidase (PPO) as well as with polyphenol production in cell free extracts. Chitosan-induced browning was related to PAL induction and corresponded to the concentration of phenols within the cells. Sensitivity of plant cells to these stress factors was affected by the amount of PO present in the cells. High PO levels in the potato cells resulted in a fast degrada...
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