Effects of 4f Electron Characteristics and Alternation Valence of Rare Earths on Photosynthesis: Regulating Distribution of Energy and Activities of Spinach Chloroplast
来源期刊：JOURNAL OF RARE EARTHS2007年第4期
论文作者：Su Mingyu Liu Xiaoqing Si Wenhui Liu Chao Zhang Yi Hong Fashui
Key words：4f electron characteristic and alternation valence; spinach; chloroplast; energy transfer and distribution; photochemical activity; rare earths;
Abstract: Chloroplasts were isolated from spinach treated with LaCl3, CeCl3, and NdCl3. Because of owning 4f electron characteristics and alternation valence, Ce treatment presented the highest enhancement in light absorption, energy transfer from LHCⅡ to PSⅡ, excitation energy distribution from PSⅠto PSⅡ, and fluorescence quantum yield around 680 nm. Compared with Ce treatment, Nd treatment resulted in relatively lower enhancement in these physiological indices, as Nd did not have alternation valence. La treatment presented the lowest enhancement, as La did not have either 4f electron or alternation valence. The increase in activities of whole chain electron transport, PSⅡ DCPIP photoreduction, and oxy gen evolution of chloroplasts was of the following order: Ce＞Nd＞La＞control. However, the photoreduction activities of spinach PSⅠ almost did not change with La, Ce, or Nd treatments. The results suggested that 4f electron characteristics and alternation valence of rare earths had a close relationship with photosynthesis improvement.
Su Mingyu1，Liu Xiaoqing1，Si Wenhui2，Liu Chao1，Zhang Yi1，Hong Fashui1
(1.College of Life Sciences, Suzhou University;
2.Suzhou Polytechnical Institute of Agriculture, Suzhou 215123, China)
Abstract:Chloroplasts were isolated from spinach treated with LaCl3, CeCl3, and NdCl3. Because of owning 4f electron characteristics and alternation valence, Ce treatment presented the highest enhancement in light absorption, energy transfer from LHCⅡ to PSⅡ, excitation energy distribution from PSⅠto PSⅡ, and fluorescence quantum yield around 680 nm. Compared with Ce treatment, Nd treatment resulted in relatively lower enhancement in these physiological indices, as Nd did not have alternation valence. La treatment presented the lowest enhancement, as La did not have either 4f electron or alternation valence. The increase in activities of whole chain electron transport, PSⅡ DCPIP photoreduction, and oxy gen evolution of chloroplasts was of the following order: Ce＞Nd＞La＞control. However, the photoreduction activities of spinach PSⅠ almost did not change with La, Ce, or Nd treatments. The results suggested that 4f electron characteristics and alternation valence of rare earths had a close relationship with photosynthesis improvement.
Key words:4f electron characteristic and alternation valence; spinach; chloroplast; energy transfer and distribution; photochemical activity; rare earths;
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