Influence of nitrogen speciation on Cd-induced toxicity in Landoltia punctata.

IF 3.4 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Phytoremediation Pub Date : 2024-11-01 Epub Date: 2024-07-17 DOI:10.1080/15226514.2024.2377225

Xianglian Wang, Guiqing Gao, Ruikang Hu, Liang Hu, Baojun Zhang, Zhanmeng Liu, Yilong Zou, Kaiwen Xu, Daishe Wu

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引用次数: 0

Abstract

Nitrogen (N) plays an important role in plant growth and developmental metabolic processes, research on nitrogen speciation regulating Cd accumulation in duckweed is still limited. In this study, the effects of three nitrogen sources (NH₄Cl, Ca(NO₃)₂ and NH₄NO₃) on the growth, Cd accumulation, and photosynthetic parameters of Landoltia punctata (L. punctata) were analyzed. The results showed that Cd enrichment in L. punctata was significantly reduced (p < 0.05) with different nitrogen treatments compared to the control (CK). Ammonium nitrogen (NH₄-N) is more conducive to the accumulation of Cd in L. punctata than nitrate nitrogen (NO₃-N). The sum of the cell wall components and soluble components of Cd in the NH₄-N treatment group was greater than that in the NO₃-N treatment group. The proportion of F_NaCl extracts in the NH₄-N treatment group was greater than in the NO₃-N treatment group. NO₃-N led to a greater reduction in photosynthetic pigment content than NH₄-N. Overall, applying different forms of nitrogen can alleviate Cd toxicity in L. punctata, and the detoxification effect of the NH₄-N treatment is stronger than that of NO₃-N treatment. This study will provide theoretical and practical support for the application of duckweed in Cd phytoremediation even in eutrophic aquatic environments.

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氮的种类对镉诱导的点灯藻毒性的影响

氮（N）在植物生长发育代谢过程中起着重要作用，但有关氮的种类调控浮萍镉积累的研究还很有限。本研究分析了三种氮源（NH4Cl、Ca(NO3)2 和 NH4NO3）对点叶浮萍（Landoltia punctata）生长、镉积累和光合参数的影响。结果表明，与对照组（CK）相比，不同氮素处理对镉富集的影响明显降低（P 0.05）。与硝态氮（NO3-N）相比，铵态氮（NH4-N）更有利于镉在L. punctata中的积累。NH4-N 处理组的细胞壁成分和可溶性成分中镉的总和大于 NO3-N 处理组。NH4-N 处理组的 FNaCl 提取物比例高于 NO3-N 处理组。与 NH4-N 相比，NO3-N 导致光合色素含量的减少幅度更大。总之，施用不同形式的氮能减轻镉对L. punctata的毒性，且NH4-N处理的解毒效果强于NO3-N处理。这项研究将为浮萍在富营养化水生环境中进行镉植物修复提供理论和实践支持。

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

International Journal of Phytoremediation 环境科学-环境科学

CiteScore

7.60

自引率

5.40%

发文量

145

审稿时长

3.4 months

期刊介绍： The International Journal of Phytoremediation (IJP) is the first journal devoted to the publication of laboratory and field research describing the use of plant systems to solve environmental problems by enabling the remediation of soil, water, and air quality and by restoring ecosystem services in managed landscapes. Traditional phytoremediation has largely focused on soil and groundwater clean-up of hazardous contaminants. Phytotechnology expands this umbrella to include many of the natural resource management challenges we face in cities, on farms, and other landscapes more integrated with daily public activities. Wetlands that treat wastewater, rain gardens that treat stormwater, poplar tree plantings that contain pollutants, urban tree canopies that treat air pollution, and specialized plants that treat decommissioned mine sites are just a few examples of phytotechnologies.