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Effects of Ultraviolet-B Radiation on Photosynthesis in Tobacco (Nicotiana tabacum cv. Petit Havana SR1) Leaves
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 Title & Authors
Effects of Ultraviolet-B Radiation on Photosynthesis in Tobacco (Nicotiana tabacum cv. Petit Havana SR1) Leaves
Lee, Hae-Youn; Park, Youn-Il; Hong, Young-Nam;
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The effect of ultraviolet-B (UV-B) radiation on photosynthesis was studied by the simultaneous measurements of evolution and chlorophyll (Chl) fluorescence in tobacco leaves. When the tobacco leaves were teated with UV-B (1 ), the maximal photosynthetic , evolution (Pmax; 4.60 ) at 200 ) was decreased with increasing time of UV-B treatment showing 80% decline after 4 h treatment. Chl fluorescence parameters were also affected by ultraviolet-B. Fo was increased while both Fm and Fv were decreased, resulted in the decreased of photochemical efficiency of PSII (Fv/Fm). Non-radiative dissipation of absorbed light as heat as estimated as NPQ (Fm/Fm' - 1) was also decreased with increasing time of UV-B treatment while the extent of photochemical quenching (qP) was not changed. Thus, the ratio of (1-qP)/NPQ parameter was also increased with increasing time of UV-B treatment indicating PSII is under the threat of photoinhibition. The result indicate that UV-B primarily decreases the capacity to dissipate excitation energy by trans-thylakoid pH, which in turn inhibits PSII activity.
Ultraviolet-B Radiation;photosynthesis;Chlorophyll fluorescence;Photosystem II;Photochemical quenching (qP);Non-photochemical quenching (NPQ);
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