Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, UMR Université Montpellier 2, CNRS, INRA, Montpellier SupAgro, Montpellier, France.
Metallomics. 2011 Dec;3(12):1265-70. doi: 10.1039/c1mt00117e. Epub 2011 Oct 13.
Zinc (Zn) is an essential element for plants that can be accumulated to very high levels in shoots of some special plant species named hyperaccumulators. Various strategies have been used in recent years to unravel the molecular bases of such an unusual Zn transport and storage, especially in Brassicacea species. In these studies, several Zn transporters and chelators have been identified that exist both in sensitive and hyperaccumulating Brassicacea species allowing the construction of a general model for Zn homeostasis. However, some determinants involved in shoot Zn tolerance are still missing. We have previously shown that defensins confer Zn tolerance and have recently studied the sub-cellular localisation of a leaf A. halleri defensin. In this mini review, we explain why we propose that family 1 defensins could play a role in the protection of the endoplasmic reticulum functioning in leaves during a Zn overload.
锌（Zn）是植物必需的元素，可以在某些被称为超积累植物的特殊植物物种的茎中积累到非常高的水平。近年来，人们采用了各种策略来揭示这种不寻常的锌运输和储存的分子基础，特别是在十字花科植物中。在这些研究中，已经鉴定出了几种锌转运体和螯合剂，它们既存在于敏感植物中，也存在于超积累植物中，从而构建了锌稳态的一般模型。然而，一些涉及茎中锌耐受性的决定因素仍然缺失。我们之前已经表明防御素赋予了锌耐受性，并且最近研究了一种 A. halleri 防御素在叶子中的亚细胞定位。在这个小综述中，我们解释了为什么我们提出家族 1 防御素可能在 Zn 过载时保护叶子中内质网的功能方面发挥作用。
