Phytoremediation potential of Bacopa monnieri in the removal of heavy metals

Dineshkumar, M.; Sivalingam, A.; Thirumarimurugan, M.

doi:10.22438/jeb/40/4(si)/jeb_11

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…The higher accumulation of Pb and Cd in the roots than in shoots (Table 2) is consistent with the previous studies (Chatterjee et al, 2018; Dineshkumar et al, 2019), which demonstrated the higher accumulation of Cd in the roots of B. monnieri and W. somnifera . Generally, the root cell wall restricts the translocation of these heavy metals to other parts of the plant, thereby sequestering them in the root cells (Zhang et al, 2016).…”

Section: Discussionsupporting

confidence: 92%

Biochar amendment reduced the risk associated with metal uptake and improved metabolite content in medicinal herbs

Nigam

Khare

Ahsan

et al. 2021

Physiologia Plantarum

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Contaminations of heavy metals such as lead (Pb) and cadmium (Cd) in medicinal plants (MPs) not only restrict their safe consumption due to health hazards but also lower their productivity. Biochar amendments in the soil are supposed to immobilize the toxic metals, improve the soil quality, and agricultural productivity. However, the impact of biochar on growth attributes, metal accumulation, pharmacologically active compounds of MPs, and health risk is less explored. An experiment was performed on three medicinal plants [Bacopa monnieri (L.), Andrographis paniculata (Burmf.) Nees, and Withania somnifera (L.)] grown in a greenhouse in soil co‐contaminated with Pb and Cd (at two concentrations) without and with biochar amendments (2% and 4% application rates). The fractionation of Pb and Cd, plant growth parameters, stress enzymes, photosynthetic capacity, pharmacologically active compounds, nutrient content, uptake and translocation of metals, antioxidant activities, and metabolite content were examined in the three MPs. The accumulation of Pb and Cd varied from 3.25–228 and 1.29–20.2 mg kg−1, respectively, in the three MPs, while it was reduced to 0.08–18 and 0.03–6.05 mg kg−1upon biochar treatments. Plants grown in Pb and Cd co‐contaminated soil had reduced plant biomass (5%–50% depending on the species) compared to control and a deleterious effect on photosynthetic attributes and protein content. However, biochar amendments significantly improved plant biomass (21%–175%), as well as photosynthesis attributes, chlorophyll, and protein contents. Biochar amendments in Pb and Cd co‐contaminated soil significantly reduced the health hazard quotient (HQ) estimated for the consumption of these medicinal herbs grown on metal‐rich soil. An enhancement in secondary metabolite content and antioxidant properties was also observed upon biochar treatments. These multiple beneficial effects of biochar supplementation in Pb and Cd co‐contaminated soil suggested that a biochar amendment is a sustainable approach for the safe cultivation of MPs.

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Section: Discussionsupporting

confidence: 92%

Biochar amendment reduced the risk associated with metal uptake and improved metabolite content in medicinal herbs

Nigam

Khare

Ahsan

et al. 2021

Physiologia Plantarum

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“…Additionally, some pesticides were detected in some of those samples [33]. Furthermore, various experiments have demonstrated that B. monnieri has the capacity to accumulate harmful heavy metals and displays a notable tolerance to them [13][14][15]. For these reasons, conventional open-field cultivation of B. monnieri may result in the production of undesirable raw materials.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, the presence of harmful heavy metal and pesticide contamination in raw materials intended for health supplement production presents a serious concern [12]. Previous studies have indicated that B. monnieri exhibits a high tolerance to toxic heavy metals and can accumulate them [13][14][15][16]. Consequently, cultivation of B. monnieri in environments such as paddy fields or areas contaminated with heavy metals may yield undesirable raw materials.…”

Section: Introductionmentioning

confidence: 99%

Comparative Growth and Bacoside Production in Diploid and Tetraploid Bacopa monnieri (L.) Wettst. Cultivated Indoors via Hydroponic and Soil Culture Systems

Inthima,

Supaibulwatana

2024

Horticulturae

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Bacopa monnieri, a cognitive-enhancing herb crucial in health supplements, faces quality variations and contamination by toxic substances in conventional field cultivation, which hinders industrial use. Here, indoor cultivation of diploid (2x) and tetraploid (4x) B. monnieri using hydroponic and soil systems was studied. Soil cultivation promoted longer shoot lengths but resulted in lower biomass and chlorophyll contents compared to hydroponic cultivation. Conversely, soil cultivation significantly elevated total phenolics, total triterpenoids, bacoside A3, and bacopaside X contents in both lines, showing 1.7- to 3.3-fold increases over hydroponic cultivation. Furthermore, 4x plants grown in soil had higher bacopaside II and total bacoside contents than hydroponically grown plants, with 2- and 1.5-fold increases, respectively. Yet, no significant differences were observed in growth and pigment between 2x and 4x lines under the same system. Similarly, no significant differences in bioactive compound productions were found between 2x and 4x hydroponically grown plants. However, in soil, 4x plants exhibited higher total phenolic content, bacopaside II, and total bacoside contents compared to 2x plants. Interestingly, 2x plants grown in soil were the top performers for bacoside production per plant. These findings optimize cultivation practices to meet industry demands, warranting further research into large-scale production techniques.

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“…The Cd concentration was analyzed using the iCAP-7400 inductively coupled plasma optical emission spectroscopy (ICP-OES) system (Thermo Fisher Scientific, California, USA). The heavy metal translocation factor was calculated according to the following formula ( Dineshkumar et al., 2019 ): heavy metal content in the aerial plant parts/heavy metal content in the roots.…”

Section: Methodsmentioning

confidence: 99%

A novel gene SpCTP3 from the hyperaccumulator Sedum plumbizincicola redistributes cadmium and increases its accumulation in transgenic Populus × canescens

Zhuo²,

Yu³

et al. 2023

Front. Plant Sci.

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A cadmium (Cd) tolerance protein (SpCTP3) involved in the Sedum plumbizincicola response to Cd stress was identified. However, the mechanism underlying the Cd detoxification and accumulation mediated by SpCTP3 in plants remains unclear. We compared wild-type (WT) and SpCTP3-overexpressing transgenic poplars in terms of Cd accumulation, physiological indices, and the expression profiles of transporter genes following with 100 μmol/L CdCl2. Compared with the WT, significantly more Cd accumulated in the above-ground and below-ground parts of the SpCTP3-overexpressing lines after 100 μmol/L CdCl2 treatment. The Cd flow rate was significantly higher in the transgenic roots than in the WT roots. The overexpression of SpCTP3 resulted in the subcellular redistribution of Cd, with decreased and increased Cd proportions in the cell wall and the soluble fraction, respectively, in the roots and leaves. Additionally, the accumulation of Cd increased the reactive oxygen species (ROS) content. The activities of three antioxidant enzymes (peroxidase, catalase, and superoxide dismutase) increased significantly in response to Cd stress. The observed increase in the titratable acid content in the cytoplasm might lead to the enhanced chelation of Cd. The genes encoding several transporters related to Cd2+ transport and detoxification were expressed at higher levels in the transgenic poplars than in the WT plants. Our results suggest that overexpressing SpCTP3 in transgenic poplar plants promotes Cd accumulation, modulates Cd distribution and ROS homeostasis, and decreases Cd toxicity via organic acids. In conclusion, genetically modifying plants to overexpress SpCTP3 may be a viable strategy for improving the phytoremediation of Cd-polluted soil.

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Phytoremediation potential of Bacopa monnieri in the removal of heavy metals

Cited by 7 publications

References 35 publications

Biochar amendment reduced the risk associated with metal uptake and improved metabolite content in medicinal herbs

Biochar amendment reduced the risk associated with metal uptake and improved metabolite content in medicinal herbs

Comparative Growth and Bacoside Production in Diploid and Tetraploid Bacopa monnieri (L.) Wettst. Cultivated Indoors via Hydroponic and Soil Culture Systems

A novel gene SpCTP3 from the hyperaccumulator Sedum plumbizincicola redistributes cadmium and increases its accumulation in transgenic Populus × canescens

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