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Dark-adapted (10-min darkening) average (±SE) maximum fluorescence yield of photosystem II (Fv/Fm) of mature leaves of 10- to 12-week-old Nicotiana tabacum ‘Wisconsin’ at 0.5, 3, 10, 24, and 48 h of recovery following the exposure to ozone concentrations of 0, 400, 600, 800, and 1000 ppb for 30 min in a custom-made cylindrical double-walled glass chamber at 25 °C. All measurements were replicated at least three times. (This figure is available in color at JXB online.)
