Among the photoactive semiconductors such as TiO2, ZnO, Fe2O3, WO3, and CdSe, TiO2 is the most widely used as photocatalyst in different media, because of its lack of toxicity and stability. In this study, the effects of titanium dioxide were investigated to obtain the information of physiological change in rice plant. Light-adapted Chlorophyll flourescence index decreased and relative electron transport rate of rice leaves was activated by titanium dioxide under 2,400 μmol m-2 s-1 PAR (Photosynthetic active radiation). Relative electron transport rate of rice leaf treated with titanium dioxide 10 ppm was high in order of 2,400 μmol m-2 s-1 PAR, 2,200 μmol m-2 s-1 PAR, 450 μmol m-2 s-1 PAR and titanium dioxide 10 ppm (45.1%), control (32.4%), diuron 10 ppm (15.3%) under 2,400 μmol m-2 s-1 PAR. Titanium dioxide increased photosynthesis of the rice leaf under 13.6 KJ m-2 day-1 UV-B only. With titanium dioxide 20 ppm, reduced UV-B (0.15 KJ m-2 day-1) intensity changed the induction of proteins and twenty-five proteins were identified. Among them, seventy proteins were up-regulated, four proteins were down-regulated and four proteins were newly synthesized. Function of these proteins was related to photosynthesis (52%), carbohydrate metabolism (4%), stress/defense (8%), secondary metabolism (4%), energy/electron transport (4%), and miscellaneous (28%).
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