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자외선-B 스트레스에 대한 담배 잎의 광합성 능의 변화

Effects of Ultraviolet-B Radiation on Photosynthesis in Tobacco (Nicotiana tabacum cv. Petit Havana SR1) Leaves

이혜연|홍영남|박연일
한국환경농학회 (The Korean Society Of Environmental Agriculture)|2007.09|한국환경농학회지 (Agricultural and Environmental Sciences)|제26권 제3호|pp. 239-245

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참고문헌

주제분류농학

초록

Abstract

The effect of ultraviolet-B (UV-B) radiation on photosynthesis was studied by the simultaneous measurements of O2 evolution and chlorophyll (Chl) fluorescence in tobacco leaves. When the tobacco leaves were treated with UV-B (1 Wm-2), the maximal photosynthetic O2 evolution (Pmax; 4.60 μmolm-2s-1) at 200 μmolm-2s-1 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 results indicate that UV-B primarily decreases the capacity to dissipate excitation energy by trans-thylakoid pH, which in turn inhibits PSII activity.

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