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1997
Journal Article
Titel
Diurnal fluctuations of secondary photooxidants in air and of detoxification systems in the foliage of mediterranean forest trees
Abstract
Gas-phase peroxide mixing ratios were measured in the canopy area of a Mediterranean oak/pine forest. Concurrently the activities of cell wall localized peroxidases, which protect leaves from external oxidants, were investigated. The diurnal cycles of peroxidase activity showed a strong decrease when the gas-phase concentration of highly phytotoxic hydroxy hydroperoxides increased. These results suggest that ambient gas-phase mixing ratios of organic peroxides may injure the plants' oxidative defence system.