Zinc Homeostasis and isotopic fractionation in plants: a review
Zinc Homeostasis and isotopic fractionation in plants: a review
复制标题
DOI：
10.1007/s11104-016-3146-0
复制
发表时间：
2017-02-01
期刊：
影响因子：
4.9
通讯作者：
Weiss, Dominik Jakob
中科院分区：
文献类型：
--
作者：
Caldelas, Cristina;Weiss, Dominik Jakob
质谱分析的最新进展表明，高等植物在吸收和转运过程中根据环境条件和植物的生理状态区分稳定的锌同位素。稳定的锌同位素已成为表征植物对锌供应不足反应的一种有前途的工具。本文旨在建立植物体内锌动态平衡与锌同位素分异的综合模型，并对锌动态平衡及其与其他微量元素相互作用的研究进展进行综述。综述了稳定锌同位素在植物体内的分布及其分馏的可能原因，并讨论了其与微量元素铁、铜和镍的相互作用。锌在植物体内分异的主要来源有：1)吸附，2)低亲和和高亲和转运现象，3)物种形成，4)区隔化，5)扩散。我们提出了锌在根的吸收和径向运输、根到茎的运输和再动员过程中的分异模型。未来的工作应该集中在更好地理解分馏背后的分子机制，因为这将是未来发展这种新型同位素系统的关键。稳定同位素和物种形成分析的结合可能是植物营养和体内平衡研究的有力工具。
Recent advances in mass spectrometry have demonstrated that higher plants discriminate stable Zn isotopes during uptake and translocation depending on environmental conditions and physiological status of the plant. Stable Zn isotopes have emerged as a promising tool to characterize the plants response to inadequate Zn supply. The aim of this review is to build a comprehensive model linking Zn homeostasis and Zn isotopic fractionation in plants and advance our current view of Zn homeostasis and interaction with other micronutrients.The distribution of stable Zn isotopes in plants and the most likely causes of fractionation are reviewed, and the interactions with micronutrients Fe, Cu, and Ni are discussed.The main sources of Zn fractionation in plants are i) adsorption, ii) low- and high-affinity transport phenomena, iii) speciation, iv) compartmentalization, and v) diffusion. We propose a model for Zn fractionation during uptake and radial transport in the roots, root-to-shoot transport, and remobilization.Future work should concentrate on better understanding the molecular mechanisms underlying the fractionations as this will be the key to future development of this novel isotope system. A combination of stable isotopes and speciation analyses might prove a powerful tool for plant nutrition and homeostasis studies.