Enhancing the effect of novel cd mobilization bacteria on phytoremediation and microecology of cadmium contaminated soil.

IF 3.4 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Jiapeng Li, Xiaoqian Yang, Mengxin Chen, Lei Zhang
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引用次数: 0

Abstract

The efficacy of phytoextraction for remediating heavy-metal contaminated soil depends on the bioavailability of the heavy metals and plant growth. In this study, we employed a synergistic system comprising water-soluble chitosan and the novel Cd mobilization bacteria, Serratia sp. K6 (hereafter K6), to enhance cadmium (Cd) extraction by Lolium perenne L. (ryegrass). The application of chitosan and K6 resulted in an increase in the biomass of ryegrass by 11.81% and Cd accumulation by 73.99% and effective-state Cd by 43.69% and pH decreased by 4.67%, compared to the control group. Microbiome and metabolomics analyses revealed significant alterations in the inter-root microbial ommunity, with rhizobacteria such as Sphingomonas, Nocardioides, and Bacillus likely contributing to enhanced plant growth and Cd accumulation in response to chitosan and K6 addition. Additionally, the contents of various organic acids, amino acids, lipids, and other metabolites exhibited significant changes under different additive treatments, suggesting that ryegrass can regulate its own metabolites to resist Cd stress. This study provides valuable insights into the effects of additives on phytoextraction efficiency and the soil bacterial community, offering a promising approach for phytoremediation of Cd-contaminated soils.

增强新型镉动员细菌对镉污染土壤的植物修复和微生态学的影响。
植物萃取法修复重金属污染土壤的效果取决于重金属的生物利用率和植物生长情况。在本研究中,我们采用了一种由水溶性壳聚糖和新型镉动员细菌 Serratia sp. K6(以下简称 K6)组成的协同系统,以提高黑麦草对镉(Cd)的提取率。与对照组相比,应用壳聚糖和 K6 使黑麦草的生物量增加了 11.81%,镉积累增加了 73.99%,有效态镉增加了 43.69%,pH 值降低了 4.67%。微生物组和代谢组学分析表明,根际微生物群落发生了显著变化,根瘤菌如鞘氨单胞菌、Nocardioides 和芽孢杆菌可能是壳聚糖和 K6 添加后植物生长和镉积累增强的原因。此外,在不同的添加剂处理下,各种有机酸、氨基酸、脂类和其他代谢物的含量也发生了显著变化,这表明黑麦草可通过调节自身代谢物来抵抗镉胁迫。这项研究为了解添加剂对植物萃取效率和土壤细菌群落的影响提供了宝贵的见解,为镉污染土壤的植物修复提供了一种可行的方法。
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来源期刊
International Journal of Phytoremediation
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.
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