Remediation pathways and mechanism of Fe-Zn-supported biochar on Cd accumulation in wheat: wheat tissues and coexisting elements

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2024-10-30 DOI:10.1007/s11104-024-07055-1

Tingting Yang, Xin Xiang, Shengguo Jiang, Jingguo Cao, Yuebing Sun, Yingming Xu, Zongzheng Yang

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Abstract

Background and aims

Cadmium (Cd)-contaminated wheat grains seriously threaten human health. Here, a novel iron/zinc-supported biochar (Fe/Zn-BC) was prepared and applied to investigate the remediation effects of alkaline soil and wheat contaminated with Cd, focusing on the influence mechanism on the Cd and coexisting elements accumulation in wheat.

Methods

We performed various doses of BC and Fe/Zn-BC treatment in the winter wheat pots. The available Cd content and Cd fraction in the soil, and Cd, Fe, Zn, Mn, Cu, Ni, and Pb contents in wheat tissues were determined.

Results

The results showed that the contents of DTPA-Cd and DTPA-Pb were significantly reduced by 33-54% and 10-27% in the Fe/Zn-BC treated soil, respectively. The reduction rates of Cd in wheat root, straw, node, flag leaf, and grain in Fe/Zn-BC treatments were better than those of BC treatments. Furthermore, Zn, Fe, and Mn contents increased significantly in root, straw, node, flag leaf and grain. Both the bioaccumulation factor (BF) and transfer factor (TF) of Cd were decreased with the addition of Fe/Zn-BC, expect for the TF_leaf/root. Structural equation model fitting results showed that inhibition of Cd uptake by root and promoting Cd transport from root to flag leaf were the main pathways to reduce grain Cd content. Increasing the coexisting elements of Zn and Mn to reduce the accumulation of Cd in grains through antagonism was another important mechanism in the Fe/Zn-BC treatments.

Conclusion

Fe/Zn-BC was an amendment that efficiently reduced Cd accumulation in wheat grains and had great potential for remediation of Cd-contaminated soil.

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支持铁锌的生物炭对小麦镉积累的修复途径和机制：小麦组织和共存元素

背景和目的镉（Cd）污染的小麦严重威胁人类健康。在此，我们制备了一种新型的铁/锌支撑生物炭（Fe/Zn-BC），并将其应用于研究碱性土壤和被镉污染的小麦的修复效果，重点关注镉和共存元素在小麦中积累的影响机制。结果表明，Fe/Zn-BC 处理土壤中 DTPA-Cd 和 DTPA-Pb 的含量分别显著降低了 33-54%和 10-27%。Fe/Zn-BC处理的小麦根、秸秆、节、旗叶和籽粒中镉含量的降低率均优于BC处理。此外，根、秸秆、节间、旗叶和籽粒中的锌、铁和锰含量均显著增加。添加 Fe/Zn-BC 后，镉的生物累积系数（BF）和转移因子（TF）都有所降低，叶/根的转移因子有所降低。结构方程模型拟合结果表明，抑制根对镉的吸收和促进镉从根向旗叶的迁移是降低谷粒镉含量的主要途径。结论Fe/Zn-BC 是一种能有效减少小麦籽粒中镉积累的改良剂，在镉污染土壤修复方面具有巨大潜力。

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来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.