Physiological and metabolic effect of mercury accumulation in higher plants system

Sengar, R. S.; Gautam, Madhu; Sengar, Kalpana; Chaudhary, Reshu; Garg, Sanjay

doi:10.1080/02772240903450678

Cited by 10 publications

(4 citation statements)

References 44 publications

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“…Since seed germination is sensitive to physicochemical conditions of the rhizosphere, decline in seed germination and vigor and subsequent seedling growth have been reported under HM toxicity in most cases [ 13 ]. In particular, Pb-toxicity has been shown to induce adverse effects on seed morphology, physiology, germination, and early crop growth in a variety of crops including Raphanus sativus [ 14 ], Lens culinaris [ 15 ], Oryza sativa , Hordeum vulgare [ 14 ], Elsholtzia argyi [ 16 ], Spartina alterniflora [ 17 ], Vigna radiata [ 18 ], Medicago sativa [ 19 ], and Zea mays [ 20 ], as reviewed previously [ 21 ]. In addition to Pb, exogenous application of other HMs also exhibits similar effects on seed morphology, physiology, and germination.…”

Section: Hm Toxicity Induces Morphological Anatomical and Physiological Changes In Plantsmentioning

confidence: 99%

“…For instance, Hg-mediated inhibition of seed germination and embryo growth was found to be because of the direct interaction of Hg with the –SH group(s) of the proteins, resulting in the formation of a S-Hg-S bridge causing uneven modification in protein structures and thus loss of enzymatic activities [ 23 ]. Since the functions of certain enzymes such as amylases and proteases are crucial for seed germination, their inhibition affects the process of seed germination and subsequent hypocotyl and radical growth [ 16 , 17 ].…”

Section: Hm Toxicity Induces Morphological Anatomical and Physiological Changes In Plantsmentioning

confidence: 99%

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A Comprehensive Review on the Heavy Metal Toxicity and Sequestration in Plants

et al. 2021

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Heavy metal (HM) toxicity has become a global concern in recent years and is imposing a severe threat to the environment and human health. In the case of plants, a higher concentration of HMs, above a threshold, adversely affects cellular metabolism because of the generation of reactive oxygen species (ROS) which target the key biological molecules. Moreover, some of the HMs such as mercury and arsenic, among others, can directly alter the protein/enzyme activities by targeting their –SH group to further impede the cellular metabolism. Particularly, inhibition of photosynthesis has been reported under HM toxicity because HMs trigger the degradation of chlorophyll molecules by enhancing the chlorophyllase activity and by replacing the central Mg ion in the porphyrin ring which affects overall plant growth and yield. Consequently, plants utilize various strategies to mitigate the negative impact of HM toxicity by limiting the uptake of these HMs and their sequestration into the vacuoles with the help of various molecules including proteins such as phytochelatins, metallothionein, compatible solutes, and secondary metabolites. In this comprehensive review, we provided insights towards a wider aspect of HM toxicity, ranging from their negative impact on plant growth to the mechanisms employed by the plants to alleviate the HM toxicity and presented the molecular mechanism of HMs toxicity and sequestration in plants.

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Section: Hm Toxicity Induces Morphological Anatomical and Physiological Changes In Plantsmentioning

confidence: 99%

Section: Hm Toxicity Induces Morphological Anatomical and Physiological Changes In Plantsmentioning

confidence: 99%

A Comprehensive Review on the Heavy Metal Toxicity and Sequestration in Plants

et al. 2021

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“…This, in turn, brings about an alteration in the physiological activity of plants (Israr et al 2006;Sengar et al 2010). The impairment of growth in plants is caused by Pb toxicity due to the distortion of the ultrastructure of the plant's chloroplast (Islam et al 2007;Pourrut et al 2011), the substitution of divalent ions (Cenkci et al 2010), and obstruction of electron mobility (Qufei and Fashui 2009).…”

Section: Health Effects On Flora and Faunamentioning

confidence: 99%

Toxic metals in oil sands: review of human health implications, environmental impact, and potential remediation using membrane-based approach

Ore

Adeola

2020

Energ. Ecol. Environ.

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The upsurge in energy needs is the primary influencing factor for the shift of attention from conventional hydrocarbon resources to unconventional resources. In the process of exploiting unconventional oil resources such as oil sands, priority pollutants such as heavy metals are released into the environment. Thus, there are health and environmental risks associated with exploration and mining practices. This study seeks to present an overview of the health and environmental effects of these toxic metals in oil sands. Predominantly, the sources of these pollutants in oil sands are biogenic processes and weathering of source rocks. The toxicity of metals is dependent upon the nature of the metals as well as its affinity to bond with the silicate matrix. The consumption of plants and water from rivers, lakes, and streams with proximity to oil sand deposits, could pose severe health risks to consumers, as significant amounts of Hg and other toxic metals are leached during oil recovery and other developmental processes. This review pointed to the use of membrane-based processes and other integrated approaches as vital remediation strategies em pl oy ed f or the rest or ation of resources to t heir pr istine state and metal recov er y. I t is recommended that exploration practices and technologies should be improved towards the reduction of on-site metal pollution or off-site metallic contamination during refining or waste management.

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“…The main anthropogenic activities that cause toxic release of Hg to the environment include; silver, gold, and Hg mining; fossil fuel combustion; and smelting of non-ferrous metals ( Li et al, 2020 ; Arregui et al, 2021 ). It is reported that Hg causes contamination of the lands and irrigation water that produce approximately 100,000 tons of crops annually ( Sengar et al, 2010 ). China is the largest anthropogenic source of Hg, with emissions of 500–1,000 t annually ( Streets et al, 2005 ; Obrist et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide Nanoparticles Improve Pleioblastus pygmaeus Plant Tolerance to Arsenic and Mercury by Stimulating Antioxidant Defense and Reducing the Metal Accumulation and Translocation

et al. 2022

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The utilization of nanoparticles to potentially reduce toxicity from metals/metalloids in plants has increased in recent years, which can help them to achieve tolerance under the stressful conditions. An in vitro experiment was conducted to investigate five different levels of zinc oxide nanoparticles (ZnO-NPs; 0, 50, 100, 150, and 200 μM) both alone and in combination with 150 μM arsenic (As) and 150 μM mercury (Hg) in one-year-old Pleioblastus pygmaeus (Miq.) Nakai plants through four replications. The results demonstrated that As and Hg alone had damaging effects on the plant growth and development. However, the addition of various concentrations of ZnO-NPs led to increased antioxidant activity, proline (79%) content, glycine betaine (71%) content, tyrosine ammonia-lyase (43%) activity, phenylalanine ammonia-lyase (69%) activity, chlorophyll indices, and eventually plant biomass, while the lipoxygenase activity, electrolyte leakage, soluble protein, hydrogen peroxide content, and thiobarbituric acid reactive substances were reduced. We concluded that ZnO-NPs detoxified As and Hg toxicity in the plants through increasing antioxidant activity, reducing As and Hg accumulation, As and Hg translocation from roots to shoots, and adjusting stomatal closure. This detoxification was further confirmed by the reduction of the translocation factor of As and Hg and the enhancement of the tolerance index in combination with ZnO-NPs. However, there is a need for further investigation with different metals/metalloids.

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Physiological and metabolic effect of mercury accumulation in higher plants system

Cited by 10 publications

References 44 publications

A Comprehensive Review on the Heavy Metal Toxicity and Sequestration in Plants

A Comprehensive Review on the Heavy Metal Toxicity and Sequestration in Plants

Toxic metals in oil sands: review of human health implications, environmental impact, and potential remediation using membrane-based approach

Zinc Oxide Nanoparticles Improve Pleioblastus pygmaeus Plant Tolerance to Arsenic and Mercury by Stimulating Antioxidant Defense and Reducing the Metal Accumulation and Translocation

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