Environmental Health Sciences, Morrill I, N344, University of Massachusetts, Amherst, MA, 01003, United States.
School of Applied Meteorology, Nanjing University of Information Science and Technology, Ningliu Rd 219, Nanjing, Jiangsu, 21044, China.
Environ Pollut. 2021 Apr 1;274:116526. doi: 10.1016/j.envpol.2021.116526. Epub 2021 Jan 21.
Accumulation of metals by plants is an important area of investigation in plant ecology and evolution as well as in soil contamination/phytoremediation practices. This paper reports that hormetic-biphasic dose-response relationships were commonly observed for multiple agents (i.e. arsenic, cadmium, chromium, fluoride, lead, and zinc) and 20 species in plant (hyper)accumulator studies. The hormetic stimulation was related to metal accumulation in affected tissues, with the metal stimulation concentration zone unique for each metal, species, tissue, and endpoint studied. However, quantitative features of the hormetic dose response were similar across all (hyper)accumulation studies, with results independent of plant species, endpoints measured, and metal. The dose-dependent stimulatory and inhibitory/toxic plant responses were often associated with the up- and down-regulation of adaptive mechanisms, especially those involving anti-oxidative enzymatic processes. These findings provide a mechanistic framework to account for both the qualitative and quantitative features of the hormetic dose response in plant (hyper)accumulator studies.
金属在植物体内的积累是植物生态学和进化以及土壤污染/植物修复实践中的一个重要研究领域。本文报告称，多种金属（如砷、镉、铬、氟、铅和锌）和 20 种植物（超）积累者研究中，通常观察到兴奋-双相剂量反应关系。兴奋刺激与受影响组织中的金属积累有关，受影响组织中的金属刺激浓度区对于每种金属、物种、组织和研究终点都是独特的。然而，所有（超）积累研究中的兴奋剂量反应的定量特征都相似，结果与植物物种、测量的终点以及金属无关。依赖剂量的植物刺激和抑制/毒性反应通常与适应性机制的上调和下调有关，特别是那些涉及抗氧化酶过程的机制。这些发现为解释植物（超）积累者研究中兴奋剂量反应的定性和定量特征提供了一个机制框架。
