Insights into roles of biochar on migration and accumulation of cadmium in Spartina alterniflora Loisel. -sediment systems and their microbial effects

IF 6.1 2区生物学 Q1 PLANT SCIENCES

Plant Physiology and Biochemistry Pub Date : 2025-05-06 DOI:10.1016/j.plaphy.2025.109985

Hui Jia , Zhen Gao , Shiming Xu , Weifeng Chen , JiaQian Wang , Mengqi Zhang , Malcom Frimpong Dapaah , Abdallah Abdelfattah

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引用次数: 0

Abstract

It is widely recognized that remediating cadmium (Cd)-contaminated sediments using biochar (BC) can significantly influence plant growth and development. However, the efficiency of such remediation often diminishes in field trials compared to greenhouse experiments, likely due to limited comprehension of the BC addition on the plant-sediment-microbe interaction. In this study, a 56-day pot experiment demonstrated that BC application offered (i) enhanced plant root length and biomass, (ii) increased proline content, (iii) improved photosynthetic capacity (e.g., total chlorophyll content), and (iv) mitigated oxidative stress (e.g., decreased the peroxidase (POD) and (CAT) activity, and increased superoxide dismutase (SOD) activity). The increased SOD allowed better scavenging of reactive oxygen species (ROS) in leaves (the primary site of ROS generation), thereby alleviating leaf growth retardation. Notably, the translocation factor of Cd significantly reduced to 0.0034 in BC-amended sediments, under high-Cd toxicity. Qualitative and quantitative analysis identified that BC facilitated the Cd binding ability on the wall of the root cells (up to 85.67 ± 0.88 %) by increasing the adsorption capacity of matrix polysaccharides. Furthermore, the bioavailable Cd proportion in sediments was markedly reduced after BC addition. BC also increased the relative abundances of bacteria, such as Desulfuromonadia and Alteromonadaleswhich were involved in Cd immobilization, and enhanced microbial adaptability to Cd-stress by boosting genetic and environmental information processing functions. The mechanisms on how BC reduced the bioavailable Cd in sediment was dependent on both BC and root presence. These findings demonstrated that BC application is an effective strategy for remediating Cd-contaminated coastal wetlands, offering significant benefits for environmental health and human well-being.

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生物炭对互花米草镉迁移和积累的影响。-沉积物系统及其微生物效应

利用生物炭（BC）修复镉污染沉积物可以显著影响植物的生长发育。然而，与温室试验相比，这种修复的效率在田间试验中往往会降低，这可能是由于对BC添加对植物-沉积物-微生物相互作用的理解有限。在本研究中，56天盆栽试验表明，施用BC可以(i)增加植株根长和生物量，（ii）增加脯氨酸含量，（iii）提高光合能力（如叶绿素总含量），（iv）减轻氧化应激（如降低过氧化物酶（POD）和CAT活性，增加超氧化物歧化酶（SOD）活性）。升高的SOD能够更好地清除叶片中的活性氧（ROS），从而缓解叶片生长迟缓。值得注意的是，在高Cd毒性下，bc修饰的沉积物中Cd的转运因子显著降低至0.0034。定性和定量分析表明，BC通过提高基质多糖的吸附能力，促进了根细胞壁上Cd的结合能力（达85.67±0.88%）。此外，添加BC显著降低了沉积物中生物有效Cd的比例。BC还增加了参与Cd固定化的Desulfuromonadia和alteromonadala等细菌的相对丰度，并通过增强遗传和环境信息处理功能增强了微生物对Cd胁迫的适应性。BC降低沉积物中生物有效镉的机制取决于BC和根的存在。这些研究结果表明，应用BC是修复cd污染的沿海湿地的有效策略，对环境健康和人类福祉具有显着的益处。

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来源期刊

Plant Physiology and Biochemistry 生物-植物科学

CiteScore

11.10

自引率

3.10%

发文量

410

审稿时长

33 days

期刊介绍： Plant Physiology and Biochemistry publishes original theoretical, experimental and technical contributions in the various fields of plant physiology (biochemistry, physiology, structure, genetics, plant-microbe interactions, etc.) at diverse levels of integration (molecular, subcellular, cellular, organ, whole plant, environmental). Opinions expressed in the journal are the sole responsibility of the authors and publication does not imply the editors'' agreement. Manuscripts describing molecular-genetic and/or gene expression data that are not integrated with biochemical analysis and/or actual measurements of plant physiological processes are not suitable for PPB. Also "Omics" studies (transcriptomics, proteomics, metabolomics, etc.) reporting descriptive analysis without an element of functional validation assays, will not be considered. Similarly, applied agronomic or phytochemical studies that generate no new, fundamental insights in plant physiological and/or biochemical processes are not suitable for publication in PPB. Plant Physiology and Biochemistry publishes several types of articles: Reviews, Papers and Short Papers. Articles for Reviews are either invited by the editor or proposed by the authors for the editor''s prior agreement. Reviews should not exceed 40 typewritten pages and Short Papers no more than approximately 8 typewritten pages. The fundamental character of Plant Physiology and Biochemistry remains that of a journal for original results.