测定油橄榄（Olea europaea L. cv. 'Sigoise'）中的几种微量元素。
Measurement of selected trace elements in Olea europaea L. cv. 'Sigoise'.
机构信息
Laboratory of Exploration and Valorization of Steppe Ecosystem, Faculty of Science of Nature and Life, Ziane Achour University of Djelfa, Cité Aîn Chih, P.O. Box 3117, Djelfa, 17000, Algeria.
出版信息
J Trace Elem Med Biol. 2020 Dec;62:126595. doi: 10.1016/j.jtemb.2020.126595. Epub 2020 Jun 18.
BACKGROUND
Olive-trees (Olea europaea L.) are the dominant rustic trees cultivated in the Mediterranean agricultural zones. Major and micronutrients play an indispensable role in their plant physiological functions although; the effect of trace elements on metabolic processes has not been sufficiently investigated, especially in olive-trees.
METHODS
In the current study, we have used X-ray fluorescence (XRF) spectrometry to determine selected major and trace elements (Br, Cu, Fe, K, Mn, P, Rb and Zn) in the main olive cultivar cultivated in Algeria, cv.'Sigoise'. Certified reference materials viz. IAEA-336 (Lichen) and NIST-1646a (Estuarine sediment) were evaluated simultaneously with the soil and plant samples for quality control of the analytical method.
RESULTS
The results show that Fe and Mn concentrations were superior in leaves than fruits. However large amounts of K, Cu and Rb were accumulated in the olive-fruits. The contents of all chemical elements were above the threshold limits for possible plant nutrient deficiencies, except for P whose concentration was in borderline requirement of olive trees. High values of a translocation factor index were found for K, Cu and Rb (TFs > 4). Principal component analysis (PCA) indicated that K was highly related with olives-fruits, suggesting that the fruit was the principal organ of K storage. Furthermore, dietary element intake through consuming olives was also estimated and compared to recommended daily intakes (RDIs) and daily permissible limits (DPLs). The estimations of chemical element intakes were below the DPLs set by WHO/FAO guidelines for human nutrition.
CONCLUSION
The present work indicates that the concentrations of macro- and microelements (Cu, Fe, K, Mn and Zn) were above the threshold limits for possible plant deficiencies except for P, and this cultivar can easily accumulate high amount of K in their organs (predominance in olives). These findings will be used to achieve efficient fertilization for O. europaea orchards.
背景
油橄榄（Olea europaea L.）是地中海农业区主要的乡土树种。大量元素和微量元素在植物生理功能中起着不可或缺的作用；然而，微量元素对代谢过程的影响尚未得到充分研究，特别是在油橄榄中。
方法
在本研究中，我们使用 X 射线荧光光谱法（XRF）测定了阿尔及利亚主要栽培橄榄品种“Sigoise”中的选定大量和微量元素（Br、Cu、Fe、K、Mn、P、Rb 和 Zn）。同时使用 IAEA-336（地衣）和 NIST-1646a（河口沉积物）对认证参考材料进行评估，以控制分析方法的质量。
结果
结果表明，Fe 和 Mn 浓度在叶片中高于果实。然而，大量的 K、Cu 和 Rb 在橄榄果实中积累。除 P 外，所有化学元素的含量均高于可能的植物营养缺乏的阈值限制，其浓度处于橄榄树的边缘需求。K、Cu 和 Rb 的迁移因子指数（TFs > 4）值较高。主成分分析（PCA）表明 K 与橄榄果实高度相关，表明果实是 K 储存的主要器官。此外，还通过食用橄榄来估计和比较饮食元素的摄入量与推荐的每日摄入量（RDIs）和每日允许摄入量（DPLs）。根据世界卫生组织/粮农组织人类营养指南，化学元素摄入量的估计值低于 DPLs。
结论
本研究表明，除 P 外，大量和微量元素（Cu、Fe、K、Mn 和 Zn）的浓度均高于可能的植物缺乏的阈值限制，该品种很容易在其器官中积累大量的 K（主要在橄榄中）。这些发现将用于实现油橄榄果园的高效施肥。
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