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Yadav M, George N, Dwibedi V. Emergence of toxic trace elements in plant environment: Insights into potential of silica nanoparticles for mitigation of metal toxicity in plants. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 333:122112. [PMID: 37392865 DOI: 10.1016/j.envpol.2023.122112] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 05/31/2023] [Accepted: 06/24/2023] [Indexed: 07/03/2023]
Abstract
Emergence of trace elements at potentially toxic concentrations in the environment has become a global issue in recent times. Owing to the rapid population growth, unregulated industrialisation, intensive farming practices and excessive mining activities, these elements are accumulating in environment at high toxic concentrations. The exposure of plants to metal-contaminated environments severely influences their reproductive and vegetative growth, eventually affecting crop performance and production. Hence, it is crucial to find alternatives to mitigate the stress caused by toxic elements, in plants of agricultural importance. In this context, silicon (Si) has been widely recognized to alleviate metal toxicity and promote plant growth during various stress conditions. Amending soil with silicates has shown to ameliorate the lethal effects of metals and stimulates crop development. However, in comparison to silicon in bulk form, nano-sized silica particles (SiNPs) have been demonstrated to be more efficient in their beneficial roles. SiNPs can be used for various technological applications, viz. Improving soil fertility, agricultural yield, and remediating heavy metal-polluted soil. The research outcomes of studies focussing on role of silica nanoparticles to specifically mitigate the metal toxicity in plants have not been reviewed earlier in depth. The aim of this review is to explore the potential of SiNPs in alleviating metal stress and improving plant growth. The benefits of nano-silica over bulk-Si fertilizers in farming, their performance in diverse plant varieties, and the possible mechanisms to mitigate metal toxicity in plants have been discussed in detail. Further, research gaps are identified and future prospects are envisioned for advanced investigations in this field. The growing interest towards nano-silica related research will facilitate exploration of the true prospective of these nanoparticles for mitigation of metal stress in crops and in other fields of agriculture as well.
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Affiliation(s)
- Mohini Yadav
- University Institute of Biotechnology, Chandigarh University, Mohali, Punjab, 140413, India
| | - Nancy George
- University Institute of Biotechnology, Chandigarh University, Mohali, Punjab, 140413, India.
| | - Vagish Dwibedi
- University Institute of Biotechnology, Chandigarh University, Mohali, Punjab, 140413, India; Institute of Soil, Water and Environmental Sciences, The Volcani Institute, Agricultural Research Organization, Rishon LeZion, 7505101, Israel
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Lopes NGM, Kloss RB, Dos Santos IC, Souza VL, Prasad MNV, Mangabeira PAO, França MGC. Soil flooding and its outcome on cadmium and nutrient uptake affect photosynthetic activity in Inga laurina plants. ECOTOXICOLOGY (LONDON, ENGLAND) 2023; 32:73-81. [PMID: 36626014 DOI: 10.1007/s10646-022-02615-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Urban areas next to mangroves are subject to progressive heavy metal contamination. Treelets of Inga laurina were collected in this ecosystem and cultivated for 30 days in waterlogged conditions and closed pots (WC) and at field capacity (FC), while exposed to different Cd concentrations (0, 50 and 100 mg·kg-1). Soil water conditions did not affect total Cd in plants, with Cd accumulating in roots and WC inducing less leaf chlorophyll while increasing carotenoids and chlorophyll ratio. Higher net photosynthesis, stomatal conductance, transpiration, and Ci/Ca ratio were observed under the highest Cd concentration and WC, while being conservative in water consumption as shown by the reduction in both water use efficiencies. Nutritional uptake behaved differently for each element, with N, Mg and Ca not being affected by Cd under WC but K increasing with Cd. At FC, plants showed higher values than WC, with the highest Cd concentration at FC showing the highest values overall. Nutrient allocation in organs was affected by WC in N, Mg, K, P and Ca but only P by Cd, with WC reducing nutrients overall and N, Mg and Ca behaving the same in both soil conditions while K was lowered in leaves and increased in roots under WC. P allocation under WC was not hindered by Cd even showing higher values in it than FC in some treatments. Altogether, results indicate that I. laurina can be considered a Cd-tolerant species, especially in WC and it presents a potential to be used as a phytoremediator plant.
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Affiliation(s)
- Namir G M Lopes
- Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Campos Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16, Bairro Sobradinho, CEP 45662-900, Ilhéus, Ba, Brasil
| | - Rodrigo B Kloss
- Departamento de Botânica, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, Brasil
| | - Ivanildes C Dos Santos
- Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Campos Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16, Bairro Sobradinho, CEP 45662-900, Ilhéus, Ba, Brasil
| | - Vânia L Souza
- Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Campos Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16, Bairro Sobradinho, CEP 45662-900, Ilhéus, Ba, Brasil
| | - Majeti N V Prasad
- Department of Plant Science, University of Hyderabad, Hyderabad, Telangana, India
| | - Pedro A O Mangabeira
- Departamento de Ciências Biológicas, Universidade Estadual de Santa Cruz, Campos Soane Nazaré de Andrade, Rodovia Jorge Amado, Km 16, Bairro Sobradinho, CEP 45662-900, Ilhéus, Ba, Brasil.
| | - Marcel G C França
- Departamento de Botânica, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, Brasil.
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Dual Role of Metallic Trace Elements in Stress Biology-From Negative to Beneficial Impact on Plants. Int J Mol Sci 2019; 20:ijms20133117. [PMID: 31247908 PMCID: PMC6651804 DOI: 10.3390/ijms20133117] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 06/19/2019] [Accepted: 06/24/2019] [Indexed: 11/24/2022] Open
Abstract
Heavy metals are an interesting group of trace elements (TEs). Some of them are minutely required for normal plant growth and development, while others have unknown biological actions. They may cause injury when they are applied in an elevated concentration, regardless of the importance for the plant functioning. On the other hand, their application may help to alleviate various abiotic stresses. In this review, both the deleterious and beneficial effects of metallic trace elements from their uptake by roots and leaves, through toxicity, up to the regulation of physiological and molecular mechanisms that are associated with plant protection against stress conditions have been briefly discussed. We have highlighted the involvement of metallic ions in mitigating oxidative stress by the activation of various antioxidant enzymes and emphasized the phenomenon of low-dose stimulation that is caused by non-essential, potentially poisonous elements called hormesis, which is recently one of the most studied issues. Finally, we have described the evolutionary consequences of long-term exposure to metallic elements, resulting in the development of unique assemblages of vegetation, classified as metallophytes, which constitute excellent model systems for research on metal accumulation and tolerance. Taken together, the paper can provide a novel insight into the toxicity concept, since both dose- and genotype-dependent response to the presence of metallic trace elements has been comprehensively explained.
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