| visible foliar injury and physiological responses to ozone in italian provenances of fraxinus excelsior and f. ornus. | we compared leaf visible injury and physiological responses (gas exchange and chlorophyll a fluorescence) to high o3 exposure (150 nmol mol(-1) h, 8 h day(-1), 35-40 days) of two woody species of the same genus with different ecological features: the mesophilic green ash (fraxinus excelsior) and the xerotolerant manna ash (f. ornus). we also studied how provenances from northern (piedmont) and central (tuscany) italy, within the two species, responded to o3 exposure. onset and extent of visible ... | 2007 | 17450285 |