Effects of CeCl3 on Energy Transfer and Oxygen Evolution in Spinach Photosystem Ⅱ
来源期刊：JOURNAL OF RARE EARTHS2007年第5期
论文作者：Su Mingyu Zhang Lu Liu Xiaoqing Si Wenhui Liu Chao Hong Fashui
Key words：CeCl3; spinach; photosystem Ⅱ; spectral characteristics; energy transfer; oxygen evolution; rare earths;
Abstract: Due to 4f electron characteristics and alternation valence, cerium involved in an oxidation-reduction reaction in plant, closely relating to photosynthesis. Our studies proved that cerium could promote photosynthesis and greatly improve spinach growth. However, the mechanism of promoting energy transfer and conversion by cerium remains unclear. Here we reported that the effects of Ce3+ on energy transfer and oxygen evolution in photosystem Ⅱ(PSⅡ) isolated from spinach, which was related to 4f electron characteristics and alternation valence in Ce molecule. The methods of absorption spectrum, fluorescence spectrum were used in the research. Results showed that Ce3+ treatment at low concentration could suitably change PSⅡ microenvironment, increase the absorbance of visible light, improve the energy transfer among amino acids within PSⅡ protein-pigment complex, and accelerate energy transport from tyrosine residue to chlorophyll a. In summary, the photochemical activity of PSⅡ(fluorescence quantum yield) and its oxygen evolving rate were enhanced by Ce3+.
Su Mingyu1，Zhang Lu1，Liu Xiaoqing1，Si Wenhui2，Liu Chao1，Hong Fashui1
(1.College of Life Sciences, Suzhou University;
2.Suzhou Polytechnical Institute of Agriculture, Suzhou 215123, China)
Abstract:Due to 4f electron characteristics and alternation valence, cerium involved in an oxidation-reduction reaction in plant, closely relating to photosynthesis. Our studies proved that cerium could promote photosynthesis and greatly improve spinach growth. However, the mechanism of promoting energy transfer and conversion by cerium remains unclear. Here we reported that the effects of Ce3+ on energy transfer and oxygen evolution in photosystem Ⅱ(PSⅡ) isolated from spinach, which was related to 4f electron characteristics and alternation valence in Ce molecule. The methods of absorption spectrum, fluorescence spectrum were used in the research. Results showed that Ce3+ treatment at low concentration could suitably change PSⅡ microenvironment, increase the absorbance of visible light, improve the energy transfer among amino acids within PSⅡ protein-pigment complex, and accelerate energy transport from tyrosine residue to chlorophyll a. In summary, the photochemical activity of PSⅡ(fluorescence quantum yield) and its oxygen evolving rate were enhanced by Ce3+.
Key words:CeCl3; spinach; photosystem Ⅱ; spectral characteristics; energy transfer; oxygen evolution; rare earths;
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