کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1259851 | 971698 | 2007 | 7 صفحه PDF | دانلود رایگان |
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 LHC II to PS II, excitation energy distribution from PS I to PS II, 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, PS II DCPIP photoreduction, and oxygen evolution of chlorop lasts was of the following order: Ce > Nd > La > control. However, the photoreduction activities of spinach PS I 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.
Journal: Journal of Rare Earths - Volume 25, Issue 4, August 2007, Pages 495-501