Effects of SO2 fumigations on photosynthetic CO2 gas exchange, chlorophyll a fluorescence emission and antioxidant enzymes in the lichens Evernia prunastri and Ramalina farinacea

antioxidantes antioxidants antioxydant carbon dioxide chlorophylle chlorophylls clorofilas dioxyde de carbone dioxyde de soufre enzimas enzyme enzymes fluorescence fluorescencia fumigation gas exchange intercambio de gases lichen lichenes photosynthese photosynthesis pollution sulphur dioxide