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比较系统而深入地研究了在水培下稀土元素La~(3+)与菠菜体内叶绿素的作用. 结果表明: La~(3+)能促进菠菜的生长, 提高光合效率; 明显增加叶绿素含量, 缺Mg~(2+)情况下La~(3+)可部分取代Mg~(2+)的作用; 对PSⅡ形成的促进作用比对PSⅠ的明显, 提高PSⅡ的电子传递效率. ICP-MS和原子吸收测定结果进一步表明, 稀土进入叶绿体内后不仅使Mg~(2+)叶绿素增加, 而且叶绿素上结合有稀土元素, 形成了稀土叶绿素, 缺Mg~(2+)情况下用La~(3+)处理后稀土叶绿素约占总叶绿素的72%. UV-Vis, FT-IR和EXAFS表征出La~(3+)参与了叶绿素卟啉环中N的配位, La-N键长为0.253nm.
The effects of rare earth element La ~ (3+) on the chlorophyll content in spinach were studied systematically and deeply.The results showed that La ~ (3+) could promote the growth of spinach and increase the photosynthetic efficiency, significantly increase the content of chlorophyll, In the absence of Mg ~ (2+), La ~ (3+) could partially replace Mg ~ (2+), and the promotion of PSⅡ was more obvious than that of PSⅠ, and the electron transport efficiency of PSⅡ was improved. ICP- The results of atomic absorption spectrometry further showed that the rare earth elements not only increased the chlorophyll content of Mg 2+ but also incorporated the rare earth element into the chlorophyll and formed the rare earth chlorophyll. Under the condition of Mg 2+, +) Treatment accounted for 72% of the total chlorophyll.Ul-Vis, FT-IR and EXAFS showed that La ~ (3+) was involved in the coordination of N in the chlorophyll porphyrin ring.The La-N bond length was 0.253 nm.