| PO43-和柠檬酸对稀土元素在小麦体内积累和分异的影响 |
| 摘要点击 1485 全文点击 1583 投稿时间：2004-10-13 修订日期：2005-01-06 |
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| 中文关键词 稀土 分异 PO43- 柠檬酸 小麦 四重效应 |
| 英文关键词 rare earth elements (REEs) fractionation PO43- citrate wheat tetrad effect |
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| 中文摘要 |
| 基于营养液培养,添加外源稀土和ICP-MS分析技术,研究了无机配体PO43-(Pi)及有机配体柠檬酸(Cit)对小麦器官中稀土元素积累和分异的影响.结果表明,不同Pi水平对小麦根中的稀土总含量(∑REE)影响较小,但显著降低叶中∑REE含量;而不同Cit水平对小麦根、叶中∑REE含量都有明显降低作用.对照植物(无Pi、Cit添加)中,稀土元素在小麦根中具有中稀土(MREE)富集及M-型四重效应分布特征,叶中有重稀土(HREE)富集及W-型四重效应分布特征.不同Pi处理对四重效应无明显作用,但进一步加强HREE在小麦叶片中的富集.添加柠檬酸使对照植物根和叶中的分异有逐渐减弱的趋势,在高浓度处理时(Cit≥150μmol·L-),小麦根和叶中出现轻稀土(LREE)富集. |
| 英文摘要 |
| This paper has studied the influence of phosphate (Pi, one of inorganic ligands) and citrate (Cit, one of organic ligands) on accumulation and fractionation of REEs in wheat based on aqueous culture, added with extraneous mixed REEs (MRE) and ICP-MS analysis technology. The results show that initial phosphate (Pi) solution of different levels followed by exposure to fixed-MRE solution has no significant effects on accumulation of the total concentrations of REEs (REE) in the wheat roots, but it decrease the REE dramatically in the wheat leaves. Simultaneous culture of wheat with mixture of MRE and citrate solution caused obvious decreases of the REE both in wheat roots and leaves. Compared to the control (no Pi or citrate was added), the distribution and fractionation characters of MRE had M-type tetrad effect and MREE enrichment in wheat roots, and W-type tetrad effect and HREE enrichment in wheat leaves. Different levels of Pi had no significant effects on the tetrad effect of MRE, but it notable increased the enrichment of HREE in wheat leaves. Added with citrate of different levels led the fractionation of REE decreasing gradually in wheat roots and leaves, as the concentration of citrate150μmol·L-, light REE (LREE) enrichment both existed in the roots and leaves. |
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