铕对小麦根可溶性钙含量的影响

Effect of Europium on Content of Calcium in Root of Wheat

研究了Eu对小麦（Triticumaestivum.L）细胞内Ca(2+)含量的影响方式，用原子吸收光谱法对根的可溶性钙，总钙含量进行了测定。结果表明，短时间内Eu(3+)促进根细胞可溶性钙含量增加，而随着处理时间的延长，可溶性钙含量下降，但总钙含量不断增加；对运输Ca(2+)的根细胞质膜和线粒体膜Ca(2+)-ATPase酶活性的测定，表明这两种酶活性随着细胞内可溶性钙含量的变化而变化，以维持细胞内Ca(2+)水平的稳定。Eu(3+)对植物体的作用方式可能是通过调节细胞内Ca(2+)变化来实现的。

The changes of free calcium and total calcium content of wheat(Triticum aestivum L. )root affected by Eu were determined as well as the Ca2+ -ATPase activities of cytoplasm membrane and mitochondria. The results show that Eu2+ improves the free Ca2+ content in a shorttime and then makes it decrease with the time lasting. During this Period, the activities ofCa2+ -ATPase on the cytoplasm and mitochondria also changes with the variation of free Ca2+content to keep the steadiness in cells. It is supposed that rare earth elements affect plant physiology by regulating the Ca2+ level in plant cell.