Effects of ascorbate feeding on chlorophyll fluorescence and xanthophyll cycle components in the lichen Parmelia quercina (Willd.) Vainio exposed to atmospheric pollutants

acide ascorbique acido ascorbico ascorbic acid atmosfera atmosphere chlorophylle chlorophylls clorofilas estres fluorescence fluorescencia lichen lichenes photosynthese photosynthesis pollution stress thylakoids tilacoides xanthophylle xanthophylls xantofilas