Calcium-magnesium synergy in reducing cadmium bioavailability and uptake in rice plants.

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

International Journal of Phytoremediation Pub Date : 2025-01-09 DOI:10.1080/15226514.2024.2449167

Chukwuma Arinzechi, Peicheng Huang, Yang Ping, Hao Xu, Qiming Wang, Chongjian Tang, Mengying Si, Qingzhu Li, Zhihui Yang

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Abstract

The synergistic application of calcium (Ca) and magnesium (Mg) was investigated to mitigate cadmium (Cd) uptake and translocation in rice grown in Cd-contaminated soil. A pot experiment was conducted using different Ca:Mg molar ratios (Ca1:Mg2, Ca2:Mg1, and Ca1:Mg1) to evaluate their effect on Cd uptake. The results showed that the Ca1:Mg1 treatment achieved the highest reduction in grain Cd content (54.7%, p < 0.05), followed by Ca2:Mg1 (47.6%), and Ca1:Mg2 (40.7%), all below China's National Food Safety Standard (0.2 mg kg^-1). Significant reductions were also observed in roots, stems, and leaves (p < 0.05). Ca1:Mg1 minimized Cd translocation by decreasing stem-to-grain transfer by 61.0% and xylem sap Cd by 50.1% (p < 0.05). It also reduced mobile Cd fractions in roots (F_E from 25% to 18%, F_Di from 44% to 37%) and increased DCB-extractable Fe (DCB-Fe) on roots, enhancing Cd immobilization. Ca:Mg treatments raised soil pH by 23.6-25.7% (p < 0.05), shifting Cd from bioavailable forms (F_EX reduced by 9.3%, F_CB by 17.8%) to more stable forms (F_Fe/Mn increased by 15.5%, F_OM by 1.9%). Strong negative correlations (p < 0.05, 0.01) between soil pH, DCB-Fe, Ca, Mg_TF, F_Fe/Mn, and grain Cd indicating their effect in reducing Cd uptake.

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钙镁协同作用降低水稻镉的生物利用度和吸收。

研究了钙（Ca）和镁（Mg）协同施用对镉污染土壤中水稻镉（Cd）吸收和转运的影响。采用不同的Ca:Mg摩尔比（Ca1:Mg2、Ca2:Mg1和Ca1:Mg1）进行盆栽试验，评价其对Cd吸收的影响。结果表明，Ca1:Mg1处理对籽粒Cd含量降低幅度最大（54.7%,p -1）。在根、茎和叶中也观察到显著的减少（p p p p）

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.