Impact of Rare Earth Elements in sediments on the growth and photosynthetic efficiency of the benthic plant Myriophyllum aquaticum

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
Isidora Gjata, Chantal K. E. van Drimmelen, Franca Tommasi, Costantino Paciolla, Susanne Heise
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Abstract

Purpose

Rare Earth Elements (REEs) are becoming more present in our everyday life. With this work, we aimed to study and compare the toxic responses of the REEs lanthanum (La), cerium (Ce), neodymium (Nd), and gadolinium (Gd) to the macrophyte Myriophyllum aquaticum. The scope was to evaluate if these elements trigger a response on the photosynthetic system (PSII), which causes inhibition of the growth rate of the plant.

Methods

We measured the fluorescence yield by pulse-amplitude-modulated chlorophyll fluorometer (PAM) which enabled simultaneous high-resolution fluorescence measurements of the whorls daily for the whole duration of the test (10 days) and fresh weight change (FWC) at the end of the test.

Results

Our findings suggest that La significantly decreased FWC at the highest concentration (500 mg kg−1) but did not cause any significant effects on the fluorescence yield. Ce and Nd significantly decreased the chlorophyll fluorescence between days 2 and 4, and after that the yield was not significantly different with respect to the control. Of all the REEs tested in this study, Gd showed the most negative effect as the whorls exhibited chlorosis/necrosis and the fresh weight at the end of the test decreased significantly compared to the same plant at day 0. The yield of M. aquaticum showed time-dependent effects for Gd at the highest concentration.

Conclusion

Gd was the most toxic REE, strongly affecting both the yield and FWC. The measurement of the fluorescence yield of the PSII is a useful effect observation and of high environmental importance. The difference in sensitivity between the functional and growth endpoints may give hints about the mode of action of contaminants to aquatic plants.

Abstract Image

沉积物中的稀土元素对底栖植物水生藻类的生长和光合作用效率的影响
目的稀土元素(REEs)越来越多地出现在我们的日常生活中。通过这项工作,我们旨在研究和比较稀土元素镧(La)、铈(Ce)、钕(Nd)和钆(Gd)对大型水生叶绿藻的毒性反应。方法我们使用脉冲幅度调制叶绿素荧光仪(PAM)测量了荧光产量,该仪器可在整个试验期间(10 天)每天同时对轮叶进行高分辨率荧光测量,并在试验结束时测量鲜重变化(FWC)。结果我们的研究结果表明,在最高浓度(500 毫克/千克)下,La 能显著降低 FWC,但对荧光产量没有明显影响。铈和钕在第 2 至 4 天明显降低了叶绿素荧光,之后的产量与对照组相比没有明显差异。在本研究测试的所有稀土元素中,钆的负面影响最大,因为轮叶出现萎黄/坏死,测试结束时的鲜重与第 0 天的相同植株相比明显下降。结论 Gd 是毒性最强的稀土元素,对产量和 FWC 都有强烈影响。对 PSII 的荧光产量进行测量是一种有用的效应观测,对环境具有重要意义。功能终点和生长终点之间灵敏度的差异可提示污染物对水生植物的作用模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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