CAJ | 학술논문

[目的]研究镧（La3＋）、铈（Ce3＋）、锌（Zn2＋）对水稻根系的生理生化影响，探讨过量施用稀土的环境效应。[方法]以稀土元素镧（Lan）、铈（Ce3＋）和兼具营养与毒性的重金属元素锌（Zn2＋）为胁迫因子，采用组织培养法比较三者对水稻种子萌发及幼苗生长发育的影响。[结果]La3＋、Ce3＋和Zn2＋水稻种子萌发率影响很小，但对幼苗根、苗的生长具有显著的抑制作用，且在高浓度下稀土离子的抑制作用均大于Zn2＋。水稻根可溶蛋白质含量随3种金属离子浓度的升高均呈先升后降的趋势，且La3＋、Ce3＋较Zn2＋便为敏感；CAT和POD的活性随La3＋、Ce3＋和Zn2＋浓度的增加逐渐上升，而SOD活性则先降后升；3种金属离子均能显著地刺激水稻根内MDA迅速积累。在高浓度下，La3＋、Ce3＋表现出比Zn2＋更强的毒性。【结论]稀土元素La3＋、Ce3＋同重金属元素Zn2＋对水稻的毒害机制相似。从长远来看，稀土有可能是一种新型的污染。
[목적]연구란（La3＋）、시（Ce3＋）、자（Zn2＋）대수도근계적생리생화영향，탐토과량시용희토적배경효응。[방법]이희토원소란（Lan）、시（Ce3＋）화겸구영양여독성적중금속원소자（Zn2＋）위협박인자，채용조직배양법비교삼자대수도충자맹발급유묘생장발육적영향。[결과]La3＋、Ce3＋화Zn2＋수도충자맹발솔영향흔소，단대유묘근、묘적생장구유현저적억제작용，차재고농도하희토리자적억제작용균대우Zn2＋。수도근가용단백질함량수3충금속리자농도적승고균정선승후강적추세，차La3＋、Ce3＋교Zn2＋편위민감；CAT화POD적활성수La3＋、Ce3＋화Zn2＋농도적증가축점상승，이SOD활성칙선강후승；3충금속리자균능현저지자격수도근내MDA신속적루。재고농도하，La3＋、Ce3＋표현출비Zn2＋경강적독성。【결론]희토원소La3＋、Ce3＋동중금속원소Zn2＋대수도적독해궤제상사。종장원래간，희토유가능시일충신형적오염。
[Objective] This study aimed to investigate the physiological and biochemi- cal effects of lanthanum （La3＋）, cerium （Ce3＋）, zinc （Zn2＋） on rice roots and explore the environmental effects of excessive application of rare earth. [Method] By using rare earth elements La3＋ and Ce3＋, and nutritional and toxic heavy metal element Zn2＋ as stress factors, the effects of these three elements on the germination of rice seeds, growth and development of seedlings were studied and compared by using tissue culture method. [Result] La3＋, Ce3＋ and Zn2＋ had no significant effect on germi- nation rate of rice seeds but significant inhibition effects on the growth of roots and shoots of rice seedlings, and the inhibition effects of rare earth elements in high concentrations were stronger than Zn2＋; the content of soluble protein in rice roots showed a rising-decreasing trend with the increasing concentrations of three metal ions, La3＋ and Ce3＋ were more sensitive than Zn2＋; the activities of CAT and POD increased with the increasing concentrations of La3. and Ce3＋, while the SOD activity had shown the tendency of decreased first and increased later; the three metal ions all could significantly stimulate the rapid accumulation of MDA in rice roots. La3＋ and Ce3＋ had stronger toxic effects at high concentrations than Zn2＋, [Conclusion] Toxic mechanism of rare earth elements La＋ and Ce3. is similar to that of heavy metal el- ement Zn2＋. Rare earth might become a new type of pollution in the long run.