Ludmiła Polechońska, Agnieszka Klink, Katarzyna Sokołowska
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Thus, the aim of this study was to characterize the combined effect of temperature and two trace metals (Co and Ni) on the metal bioaccumulation and viability of a model aquatic macrophyte Elodea canadensis Michx. We exposed shoots of E. canadensis to three temperatures and four metal concentrations (together and separately) applied at environmentally relevant levels. Shoot growth and metal concentration in plants were measured after 120 h. Moreover, after 24, 72 and 120 h the changes in leaf cell morphology and viability were analysed. The results showed that metal accumulation was dose-dependent and was not affected by temperature. The growth of plants was not affected by temperature nor metals. On the other hand, the exposure to Co and Ni and the elevated temperature negatively affected cell viability of E. canadensis leaves which manifested by increased permeability of plasma membranes and visible necroses. The greatest damaged leaf areas were determined after 120 h in the highest concentration of both metals and the highest temperature which indicates synergistic impact of trace metals and temperature on performance of macrohydrophytes. 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引用次数: 0
摘要
全球变暖和环境污染是当代两个至关重要的问题。由于这两个问题与城市化和人类活动对环境的影响密切相关,它们往往会同时影响生态系统。水生生境尤其容易受到热污染和化学污染的影响。温度几乎会影响水体的所有物理和化学特征,而痕量金属对水生生物的毒性也是众所周知的。然而,多种压力源的影响、累积效应以及生物的反应和可能的适应性仍是未决问题。因此,本研究的目的是描述温度和两种痕量金属(钴和镍)对模式水生大型藻类 Elodea canadensis Michx 的金属生物累积和生存能力的综合影响。 我们将 E. canadensis 的嫩枝暴露在三种温度和四种金属浓度(同时或分别)的环境相关水平下。120 小时后,测量了植株中的嫩枝生长和金属浓度。此外,还分析了 24、72 和 120 小时后叶片细胞形态和活力的变化。结果表明,金属积累与剂量有关,不受温度影响。植物的生长不受温度和金属的影响。另一方面,暴露于 Co 和 Ni 以及温度升高对 E. canadensis 叶子的细胞活力有负面影响,表现为质膜的渗透性增加和可见的坏死。在两种金属浓度最高、温度最高的情况下,120 小时后叶片受损面积最大,这表明微量金属和温度对大型水生植物的性能有协同影响。观察到的现象表明,全球变暖和/或热污染可能会影响水生大型水草在化学污染水域中的表现、它们在污染生境中的传播和定殖能力以及它们在植物修复中的适宜性。
Rising temperature impacts the trace metal uptake and toxicity in aquatic plants - A case study of Ni and Co in Elodea canadensis Michx.
The global warming and environmental pollution are two crucial contemporary concerns. As both are strongly connected with urbanisation and anthropogenic impact on the environment, they often affect the ecosystem simultaneously. Aquatic habitats are particularly susceptible to thermal and chemical pollution. Temperature influences nearly all physical and chemical features of water bodies and trace metals are known for their toxicity to aquatic organisms. However, effects of multiple stressors, cumulative effects as well as response and possible adaptations of organisms are still open questions. Thus, the aim of this study was to characterize the combined effect of temperature and two trace metals (Co and Ni) on the metal bioaccumulation and viability of a model aquatic macrophyte Elodea canadensis Michx. We exposed shoots of E. canadensis to three temperatures and four metal concentrations (together and separately) applied at environmentally relevant levels. Shoot growth and metal concentration in plants were measured after 120 h. Moreover, after 24, 72 and 120 h the changes in leaf cell morphology and viability were analysed. The results showed that metal accumulation was dose-dependent and was not affected by temperature. The growth of plants was not affected by temperature nor metals. On the other hand, the exposure to Co and Ni and the elevated temperature negatively affected cell viability of E. canadensis leaves which manifested by increased permeability of plasma membranes and visible necroses. The greatest damaged leaf areas were determined after 120 h in the highest concentration of both metals and the highest temperature which indicates synergistic impact of trace metals and temperature on performance of macrohydrophytes. The observed phenomena suggest that global warming and/or thermal pollution may have implications for the performance of aquatic macrophytes in chemically polluted waters, their ability to spread and colonize polluted habitats and their suitability in phytoremediation.
期刊介绍:
The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere.
The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.