%0 Journal Article
%T Mechanism of lanthanum effect on chlorophyll of spinach
%A HONG Fashui
%A WEI Zhenggui
%A ZHAO Guiwen
%A <br>洪法水
%A 魏正贵
%A 赵贵文
%J 中国科学C辑(英文版)
%D 2002
%I Springer
%X The mechanism of La3+ effect on chlorophyll (chl) of spinach in solution culture has been studied. The results show that La3+ can obviously promote growth, increase chlorophyll contents and photosynthetic rate of spinach. La3+ may substitute Mg2+ for chlorophyll formation of spinach when there is no Mg2+ in solution. La3+ improves significantly PSII formation and enhances electron transport rate of PSII. By ICP-MS and atom absorption spectroscopy methods, it has been revealed that rare earth elements (REEs) can enter chloroplasts and increase Mg2+-chl contents; and REEs bind to chlorophyll and also form REE-chl. REE-chl is about 72% in total chlorophyll with La3+ treatment and without Mg2+ in solution. By UV-Vis, FT-IR and extended X-ray absorption fine structure spectroscopy (EXAFS) methods, it has been found that La3+ coordinates with nitrogen of porphyrin rings with the average La-N bond length of 0.253 nm.
%K lanthanum
%K spinach
%K chlorophyll
%K spectrum characterization<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=180CF3A72E750F3261A8A60EDC957784&aid=35FE60A9C695B50B62464E723091FA66&yid=C3ACC247184A22C1&vid=94E7F66E6C42FA23&iid=0B39A22176CE99FB&sid=43608FD2E15CD61B&eid=5BC9492E1D772407&journal_id=1674-7305&journal_name=ScienceChina.Lifesciences&referenced_num=10&reference_num=0