Accumulation of copper and cadmium in soil–rice systems in terrace and lowland paddies of the Red River basin, Vietnam: the possible regulatory role of silicon

Bui, Anh Thi Kim; Duong, Lim Thi; Nguyen, Minh N.

doi:10.1007/s10653-020-00626-y

Cited by 13 publications

(7 citation statements)

References 42 publications

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“…The critical threshold of Cu toxicity in the leaves of most crop species is 30 mg kg –1 . However, the Cu concentration in the shoots under PC (48.4 mg kg –1 ) and under HC (53.7 mg kg –1 ) may have caused physiological toxicity. , The sequestered Cu in root iron plaque under the ONBC amendment mitigated the Cu influx into the roots and shoots, avoiding excessive Cu accumulation in edible parts, as reflected in the 38.1% and 74.7% decreased Cu content in roots and by 1.91-fold and 2.38-fold in shoots under NPC and NHC treatments, respectively (Figure e and f). Notably, NPC and NHC treatments notably confined the shoot Cu concentration within the normal range (<30 mg kg –1 ).…”

Section: Resultsmentioning

confidence: 99%

“…Cu contamination in paddy soil has gradually become a threat to agriculture and food security. 9,10,64 Although a decade ago it was known that iron plaque on rice roots is a natural barrier for sequestrating Cu on the root surface, 12,70 there is still a lack of environmentally friendly and cost-effective technology to boost the formation of root iron plaque. Biochar is an affordable material that can transform waste into soil conditioners or fertilizers.…”

Section: Acs Sustainablementioning

confidence: 99%

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Oxygen Nanobubble-Loaded Biochars Mitigate Copper Transfer from Copper-Contaminated Soil to Rice and Improve Rice Growth

Chu

Sha

Feng

et al. 2023

ACS Sustainable Chem. Eng.

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Copper (Cu)-contaminated paddy soil has caused substantial concerns for human health through biomagnification in the soil–rice–human chain. In this study, oxygen nanobubble-loaded biochars (ONBC), including pyrochars (NPC) and hydrochars (NHC), were used to amend Cu-contaminated paddy soils and reduce rice Cu toxicity. The ONBC amendment improved the rhizospheric redox potential and dissolved oxygen concentration via slow, continuous oxygen release, promoting root iron plaque formation and effectively inhibiting root Cu influx. Moreover, the ONBC amendment improved soil microbial diversity. The abundance of bacterial genes involved in cytosolic Cu complexation and Cu export to the periplasm space for Cu stabilization markedly improved. The sequestered Cu in root iron plaque and soil bacteria inhibited Cu influx into the shoots to avoid Cu overaccumulation in the edible parts. This was reflected by the Cu content decreasing by 1.91-fold and 2.38-fold in shoots under NPC and NHC treatments, respectively. Furthermore, the improved oxygen-enriched rhizosphere environment via the ONBC amendment promoted root activity and the abundance of bacterial genes involved in nutrients mineralization, further promoting shoot biomass by 1.46-fold and 2.29-fold under NPC and NHC treatments, respectively. This study proposes an environmentally friendly strategy to mitigate Cu transfer from soil to crops and improve crop productivity.

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Section: Resultsmentioning

confidence: 99%

Section: Acs Sustainablementioning

confidence: 99%

Oxygen Nanobubble-Loaded Biochars Mitigate Copper Transfer from Copper-Contaminated Soil to Rice and Improve Rice Growth

Chu

Sha

Feng

et al. 2023

ACS Sustainable Chem. Eng.

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“…Therefore, since hormesis can also result in phenotypic changes and adaptation strategies in plants under challenging environments ( Macias-Bobadilla et al, 2020 ), this phenomenon has the potential to enhance agricultural sustainability in a changing world ( Agathokleous & Calabrese, 2019 ). Importantly, even under non-stressful environmental conditions, Si has been proven to stimulate plant growth and metabolism ( Trejo-Téllez et al, 2020 ; Xu et al, 2020 ), though its beneficial effects are more evident under stress conditions ( Ahanger et al, 2020 ; Bui, Duong & Nguyen, 2020 ; Mandlik et al, 2020 ; Singh et al, 2020 ; Vaculík et al, 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Silicon flow from root to shoot in pepper: a comprehensive in silico analysis reveals a potential linkage between gene expression and hormone signaling that stimulates plant growth and metabolism

Gómez-Meriño

Trejo-Téllez

García-Jiménez³

et al. 2020

PeerJ

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Background Silicon (Si) is categorized as a quasi-essential element for plants thanks to the benefits on growth, development and metabolism in a hormetic manner. Si uptake is cooperatively mediated by Lsi1 and Lsi2. Nevertheless, Lsi channels have not yet been identified and characterized in pepper (Capsicum annuum), while genes involved in major physiological processes in pepper are Si-regulated. Furthermore, Si and phytohormones may act together in regulating plant growth, metabolism and tolerance against stress. Our aim was to identify potential synergies between Si and phytohormones stimulating growth and metabolism in pepper, based on in silico data. Methods We established a hydroponic system to test the effect of Si (0, 60, 125 and 250 mg L−1 Si) on the concentrations of this element in different pepper plant tissues. We also performed an in silico analysis of putative Lsi genes from pepper and other species, including tomato (Solanum lycopersicum), potato (Solanum tuberosum) and Arabidopsis thaliana, to look for cis-acting elements responsive to phytohormones in their promoter regions. With the Lsi1 and Lsi2 protein sequences from various plant species, we performed a phylogenetic analysis. Taking into consideration the Lsi genes retrieved from tomato, potato and Arabidopsis, an expression profiling analysis in different plant tissues was carried out. Expression of Si-regulated genes was also analyzed in response to phytohormones and different plant tissues and developmental stages in Arabidopsis. Results Si concentrations in plant tissues exhibited the following gradient: roots > stems > leaves. We were able to identify 16 Lsi1 and three Lsi2 genes in silico in the pepper genome, while putative Lsi homologs were also found in other plant species. They were mainly expressed in root tissues in the genomes analyzed. Both Lsi and Si-regulated genes displayed cis-acting elements responsive to diverse phytohormones. In Arabidopsis, Si-regulated genes were transcriptionally active in most tissues analyzed, though at different expressed levels. From the set of Si-responsive genes, the NOCS2 gene was highly expressed in germinated seeds, whereas RABH1B, and RBCS-1A, were moderately expressed in developed flowers. All genes analyzed showed responsiveness to phytohormones and phytohormone precursors. Conclusion Pepper root cells are capable of absorbing Si, but small amounts of this element are transported to the upper parts of the plant. We could identify putative Si influx (Lsi1) and efflux (Lsi2) channels that potentially participate in the absorption and transport of Si, since they are mainly expressed in roots. Both Lsi and Si-regulated genes exhibit cis-regulatory elements in their promoter regions, which are involved in phytohormone responses, pointing to a potential connection among Si, phytohormones, plant growth, and other vital physiological processes triggered by Si in pepper.

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“…In addition to the role of providing irrigation water, these irrigation systems are the places that will receive a large amount of wastewater from domestic and production activities, potentially risking heavy metal pollution, including Cd. A survey at 61 locations scattered throughout the North showed great differences in the Cd content in rice grains between low-lying and upland areas (Bui et al, 2020). While Cd was not observed in most rice grain samples from upland fields, it was found in rice in lowland areas with an average concentration of 0.033 ppm.…”

Section: Introductionmentioning

confidence: 98%

Cadmium Immobilization in the Rice - Paddy Soil with Biochar Additive

Vu¹,

Lan²,

Hoa³

2022

J. Ecol. Eng.

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Cadmium (Cd) is toxic for humans, but its effects on the yield and quality of rice under contaminated irrigation conditions remain uncertain. In this study, paddy soils in the Red River Delta (Vietnam) were selected for experiments with the purpose of understanding the effects of Cd contaminated irrigation water on growth, yields, and grain Cd accumulation. In addition, biochar was produced from rice husk (BRH) and rice straw for preventing Cd infiltration into rice was also studied in this experiment. A field experiment was established with applicated BRH and straw into polluted paddy soil, as a result the Cd content in grains reduced significantly. The Cd contaminated soil was added to the BRH and rice straw (RS) with six ratios, including: (1) RS 2.5%, (2) BRH 2.5%, (3) RS-BRH: 1.25-1.25%, (4) RS 5.0%, (5) BRH 5.0%, (6) RS-BRH: 2.5-2.5%, (w:w). Besides, three content levels 0.01-0.05-0.5 mg/L of Cd in irrigation water were applied throughout crop season. The results showed that the Cd accumulation in rice was in the following order: roots > stems > seeds. With 3 contaminated irrigation levels which were applied, the Cd concentrations of 0.05 mg/L and 0.5 mg/L affected plant height and yield. However, the Cd content in grains under contaminated soil condition can be controlled from 82.47-83.94% by applying a BRH ratio from 2.5-5% (w:w).

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Accumulation of copper and cadmium in soil–rice systems in terrace and lowland paddies of the Red River basin, Vietnam: the possible regulatory role of silicon

Cited by 13 publications

References 42 publications

Oxygen Nanobubble-Loaded Biochars Mitigate Copper Transfer from Copper-Contaminated Soil to Rice and Improve Rice Growth

Oxygen Nanobubble-Loaded Biochars Mitigate Copper Transfer from Copper-Contaminated Soil to Rice and Improve Rice Growth

Silicon flow from root to shoot in pepper: a comprehensive in silico analysis reveals a potential linkage between gene expression and hormone signaling that stimulates plant growth and metabolism

Cadmium Immobilization in the Rice - Paddy Soil with Biochar Additive

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