scholarly journals Heavy Metal Tolerance in Plants: Role of Transcriptomics, Proteomics, Metabolomics, and Ionomics

2016 ◽  
Vol 6 ◽  
Author(s):  
Samiksha Singh ◽  
Parul Parihar ◽  
Rachana Singh ◽  
Vijay P. Singh ◽  
Sheo M. Prasad
Keyword(s):  
Heavy Metal ◽  
Metal Tolerance ◽  
Heavy Metal Tolerance

scholarly journals Role of Silicon in Mitigation of Heavy Metal Stresses in Crop Plants

Plants ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 71 ◽  
Author(s):  
Javaid Akhter Bhat ◽  
S. M. Shivaraj ◽  
Pritam Singh ◽  
Devanna B. Navadagi ◽  
Durgesh Kumar Tripathi ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Tolerance ◽  
Abiotic Factors ◽  
Heavy Metal Tolerance ◽  
Heavy Metal Stress ◽  
Crop Plants ◽  
Metal Stress ◽  
Growth And Yield

Over the past few decades, heavy metal contamination in soil and water has increased due to anthropogenic activities. The higher exposure of crop plants to heavy metal stress reduces growth and yield, and affect the sustainability of agricultural production. In this regard, the use of silicon (Si) supplementation offers a promising prospect since numerous studies have reported the beneficial role of Si in mitigating stresses imposed by biotic as well as abiotic factors including heavy metal stress. The fundamental mechanisms involved in the Si-mediated heavy metal stress tolerance include reduction of metal ions in soil substrate, co-precipitation of toxic metals, metal-transport related gene regulation, chelation, stimulation of antioxidants, compartmentation of metal ions, and structural alterations in plants. Exogenous application of Si has been well documented to increase heavy metal tolerance in numerous plant species. The beneficial effects of Si are particularly evident in plants able to accumulate high levels of Si. Consequently, to enhance metal tolerance in plants, the inherent genetic potential for Si uptake should be improved. In the present review, we have discussed the potential role and mechanisms involved in the Si-mediated alleviation of metal toxicity as well as different approaches for enhancing Si-derived benefits in crop plants.

The role of the root cell wall in the heavy metal tolerance ofAthyrium yokoscense

1987 ◽  
Vol 101 (1) ◽  
pp. 15-20 ◽  
Author(s):  
H. Nishizono ◽  
H. Ichikawa ◽  
S. Suziki ◽  
F. Ishii
Keyword(s):  
Heavy Metal ◽  
Cell Wall ◽  
Metal Tolerance ◽  
Heavy Metal Tolerance ◽  
Root Cell ◽  
Root Cell Wall

scholarly journals The role of organic acids in heavy metal tolerance in plants

2018 ◽  
Vol 63 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Natalia Osmolovskaya ◽  
◽  
Dung Viet Vu ◽  
Ludmila Kuchaeva ◽  
◽  
...  
Keyword(s):  
Heavy Metal ◽  
Organic Acids ◽  
Metal Tolerance ◽  
Heavy Metal Tolerance

scholarly journals Probing the Role of the Chloroplasts in Heavy Metal Tolerance and Accumulation in Euglena gracilis

2020 ◽  
Vol 8 (1) ◽  
pp. 115 ◽  
Author(s):  
Bishal Khatiwada ◽  
Mafruha T. Hasan ◽  
Angela Sun ◽  
Karthik Shantharam Kamath ◽  
Mehdi Mirzaei ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Inhibitory Concentration ◽  
Metal Tolerance ◽  
Heavy Metal Tolerance ◽  
Heavy Metal Accumulation ◽  
Wild Type ◽  
Metal Transporter ◽  
Transmission Electron ◽  
Accumulation Mechanism

The E. gracilis Zm-strain lacking chloroplasts, characterized in this study, was compared with the earlier assessed wild type Z-strain to explore the role of chloroplasts in heavy metal accumulation and tolerance. Comparison of the minimum inhibitory concentration (MIC) values indicated that both strains tolerated similar concentrations of mercury (Hg) and lead (Pb), but cadmium (Cd) tolerance of the Z-strain was twice that of the Zm-strain. The ability of the Zm-strain to accumulate Hg was higher compared to the Z-strain, indicating the existence of a Hg transportation and accumulation mechanism not depending on the presence of chloroplasts. Transmission electron microscopy (TEM) showed maximum accumulation of Hg in the cytosol of the Zm-strain and highest accumulation of Cd in the chloroplasts of the Z-strain indicating a difference in the ability of the two strains to deposit heavy metals in the cell. The highly abundant heavy metal transporter MTP2 in the Z-strain may have a role in Cd transportation to the chloroplasts. A multidrug resistance-associated protein highly increased in abundance in the Zm-strain could be a potential Hg transporter to either cytosol or mitochondria. Overall, the chloroplasts appear to have major role in the tolerance and accumulation of Cd in E. gracilis.

scholarly journals Low-dose Priming of Gamma Radiation Enhanced Cadmium Tolerance in Chlamydomonas Reinhardtii by Modulating Physio-biochemical Pathways

2021 ◽  
Author(s):  
Biswajita Pradhan ◽  
Srimanta Patra ◽  
Rabindra Nayak ◽  
Shasank S. Swain ◽  
Bimal Prasad Jit ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Cell Death ◽  
Gamma Radiation ◽  
Chlamydomonas Reinhardtii ◽  
Low Dose ◽  
Metal Tolerance ◽  
Heavy Metal Tolerance ◽  
Antioxidant Defence System

Abstract Microalgae, the key components of aquatic environments, are executive natural biotic models for exploring genotoxic effect of heavy metals, irradiation and other external stimuli and the toxicant elimination. In the current scenario, removal of metal contaminants is a significant challenge. Recently, the effective removal of heavy metals from the aquatic environment using microalgae has gained immense intention. However, the concurrent toxicity has limited their use as bio-accumulants to reduce the concentration of heavy metals and promote heavy metal tolerance. Few studies opined that low dose priming with non-ionizing radiations, such as gamma radiation, increased heavy metal tolerance in plant as well as aquatic photosynthetic microalgae. In the present study, we have hypothesized the growth inhibitory physio-chemical properties by cadmium (Cd) in the green algae Chlamydomonas reinhardtii, and analysed the protective role of low-dose gamma radiations priming against Cd induced growth inhibition. In addition, we have specially emphasized on the mechanism of cell survival in the experimental species with effective notation to antioxidant defence system during Cd induced toxicity. Experimentally, we primed the Chlamydomonas reinhardtii with low-dose gamma radiation prior to Cd treatment. On the other hand, gamma-radiated and Cd-treated organisms were considered as positive controls. We calculated the rate of cell death, the deployment of antioxidant enzymes such as catalase (CAT), ascorbate peroxidase (APX), glutathione peroxidase (GPX), glutathione reductase (GSR), and superoxide dismutase (SOD). Furthermore, the role of oxidative stress related genes was analysed computationally to delineate their involvement in cell death/survival, suggesting that the low-dose priming of gamma radiation enhances the Cd tolerance by alterating cell/death pathways and other biochemical responses.

scholarly journals Heavy Metal Tolerance Trend in Extended-Spectrum β-Lactamase Encoding Strains Recovered from Food Samples

2021 ◽  
Vol 18 (9) ◽  
pp. 4718
Author(s):  
Kashaf Junaid ◽  
Hasan Ejaz ◽  
Iram Asim ◽  
Sonia Younas ◽  
Humaira Yasmeen ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Tolerance ◽  
Heavy Metal Tolerance ◽  
Heavy Metal Resistance ◽  
Metal Resistance ◽  
Food Samples ◽  
Esbl Production ◽  
Extended Spectrum ◽  
Retail Food ◽  
Esbl Producers

This study evaluates bacteriological profiles in ready-to-eat (RTE) foods and assesses antibiotic resistance, extended-spectrum β-lactamase (ESBL) production by gram-negative bacteria, and heavy metal tolerance. In total, 436 retail food samples were collected and cultured. The isolates were screened for ESBL production and molecular detection of ESBL-encoding genes. Furthermore, all isolates were evaluated for heavy metal tolerance. From 352 culture-positive samples, 406 g-negative bacteria were identified. Raw food samples were more often contaminated than refined food (84.71% vs. 76.32%). The predominant isolates were Klebsiella pneumoniae (n = 76), Enterobacter cloacae (n = 58), and Escherichia coli (n = 56). Overall, the percentage of ESBL producers was higher in raw food samples, although higher occurrences of ESBL-producing E. coli (p = 0.01) and Pseudomonas aeruginosa (p = 0.02) were observed in processed food samples. However, the prevalence of ESBL-producing Citrobacter freundii in raw food samples was high (p = 0.03). Among the isolates, 55% were blaCTX-M, 26% were blaSHV, and 19% were blaTEM. Notably, heavy metal resistance was highly prevalent in ESBL producers. These findings demonstrate that retail food samples are exposed to contaminants including antibiotics and heavy metals, endangering consumers.

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