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In this study we examined the activities of polyphenol oxidase (PPO) and   antioxidant enzymes, peroxidase (POX) and catalase (CAT) during lettuce seed   germination at different concentrations of phenol. Out of eleven varieties of   lettuce, four were chosen according to their germination tolerance to phenol   as follows: plants exhibiting high (Ljubljanska ledenka - LJL and Nansen - N)   and low toleranace (Little Gem - LG and Majska kraljica - MK). A decrease in   germination efficiency after exposure to LD50 of phenol was determined for   these four varieties. The effects of phenol treatment on POX, CAT and PPO   activities were determined after 4, 5, 6, 7 and 8 days of growth at LD50   concentrations. A trend of increased peroxidase activity was observed in   seeds grown on LD50 of phenol compared to control seeds. A significant   increase in CAT activity was observed at the beginning of treatment for MK,   LG and N in seeds grown on phenol as well as in control seeds. A trend of   increased PPO activity was observed in all control seeds. We also   investigated the affinity of PPO for two different substrates that were used   for the determination of enzyme activity. Our results show that LJL and N are   the varieties most tolerant to growth on phenol. Here we report on the   activities of their antioxidant enzymes and PPO during seed germination.   [Projekat Ministarstva nauke Republike Srbije, br. ON173017

Effect of phenol on germination capacity and polyphenol oxidase, peroxidase and catalase activities in lettuce