镧在小麦不同部位组织细胞中X射线能谱分析

XRAY ENERGY SPECTRA ANALYSIS OF LANTHANUM IN TISSUE CELLS OF DEFFERENT PARTS OF WHEAT PLANT

镧在小麦不同部位组织细胞中Ｘ射线能谱分析周世恭刘敏（中国科学院植物研究所北京１０００９３）关键词小麦，镧，超微结构识别，Ｘ射线能谱分析ＸＲＡＹＥＮＥＲＧＹＳＰＥＣＴＲＡＡＮＡＬＹＳＩＳＯＦＬＡＮＴＨＡＮＵＭＩＮＴＩＳＳＵＥＣＥＬＬＳＯＦＤＥＦＦＥ...

Lanthanum entered plants through the root and accumulated mostly in the cell wall of the root tip. Only a few accumulated in the cortex cell of the root elongation zone and in the cell wall of the mesophyllous cells. There was no detectable lanthanum in the cytoplasm. Observation with TEM (transmission electronic microscopy) indicated that lanthanum,which appeared as electron opaque deposits,was present in the cell wall of tissues in every part of the plant. The higher lanthanum contents occurred in the cell wall of root tips caused a dark appearance of the cell wall. The content of lanthanum in the cell wall of the cortex of elongation zone appeared as granules of different size. Those in the mesophyllous cell wall appeared as much less small granules. Xray energy spectrum analysis of the deposits confirmed the induction of lanthanum into the plant tissue cells and that its intensity correlated with the density of the deposits.