DIURNAL FLUCTUATIONS OF SECONDARY PHOTOOXIDANTS IN AIR AND OF DETOXIFICATION SYSTEMS IN THE FOLIAGE OF MEDITERRANEAN FOREST TREES

Authors
JUNKERMANN W POLLE A
Citation
W. Junkermann et A. Polle, DIURNAL FLUCTUATIONS OF SECONDARY PHOTOOXIDANTS IN AIR AND OF DETOXIFICATION SYSTEMS IN THE FOLIAGE OF MEDITERRANEAN FOREST TREES, Atmospheric environment, 31, 1997, pp. 61-65
Citations number
24
Journal title
Atmospheric environment → ACNP
ISSN journal
13522310
Volume
31
Year of publication
1997
Supplement
1
Pages
61 - 65
Database
ISI
SICI code
1352-2310(1997)31:<61:DFOSPI>2.0.ZU;2-V
Abstract
Gas-phase peroxide mixing ratios were measured in the canopy area of a Mediterranean oak/pine forest. Concurrently the activities of cell wa ll 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' ox idative defence system. (C) 1997 Elsevier Science Ltd.