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- W1562185611 abstract "SUMMARY Photosynthetic response to high light was determined for Bull kelp, Nereocystis luetkeana (K. Mertens) Postels and Ruprecht in order to understand how this species is affected by short‐term fluctuations in irradiance. Exposure of N. luetkeana blades to high intensity photosynthetically active radiation (1000 µmol photons m −2 s –1 ) caused increased non‐photochemical quenching of fluorescence and higher de‐epoxidation ratios for xanthophyll pigments indicating that energy‐quenching xanthophylls were used to protect blades against photoinhibition. Despite initiation of these photoprotective mechanisms, maximum photochemical efficiency of photosystem II ( F v / F m ) decreased 40% in response to a 60 min exposure to 1000 µmol photons m −2 s –1 photosynthetically active radiation indicating that photoinhibition had occurred. Light‐saturated rates of oxygen evolution were not changed significantly by the high light treatment. Recovery of maximum photochemical efficiency of photosystem II to within 8% of initial values occurred after a 300‐min dim light period. Younger sections of the blades were slightly more susceptible to high light damage than older sections. Middle sections of the blades were more prone to light‐induced damage at water temperatures of 7°C or 18°C, as compared to 13°C. Exposure to biologically effective ultraviolet‐B radiation (UV‐B be ) (up to 4.5 kJ m –2 day –1 ) in photoinhibitory light conditions did not significantly affect light‐induced damage to photosystem II." @default.
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- W1562185611 date "2011-05-12" @default.
- W1562185611 modified "2023-10-16" @default.
- W1562185611 title "Photosynthetic response of Nereocystis luetkeana (Phaeophyta) to high light" @default.
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- W1562185611 doi "https://doi.org/10.1111/j.1440-1835.2011.00614.x" @default.
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