The role of phytochelatins and antioxidants in tolerance to Cd accumulation in Brassica juncea L.

Seth, Chandra Shekhar; Chaturvedi, Pranav Kumar; Misra, Virendra

doi:10.1016/j.ecoenv.2007.10.030

Cited by 121 publications

(64 citation statements)

References 41 publications

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“…A large number of enzymes from bacteria, fungi, and plants are involved in the biodegradation of toxic pollutants. On one hand systems biology approach has revealed that toxic heavy metals (like As, Cd) could be transferred and accumulated in animals and human beings via food chain, which would cause DNA damage and carcinogenic effects by their mutagenic ability (Seth et al 2007(Seth et al , 2008, while on the other hand its approach on bioremediation would contribute toward developing advanced bioprocess technology to reduce the toxicity of the pollutants and also to obtain novel useful biomaterials (Leung 2004;Karigar and Rao 2011).…”

Section: Systems Biology Approach To Bioremediationmentioning

confidence: 99%

Biotechnological advances in bioremediation of heavy metals contaminated ecosystems: an overview with special reference to phytoremediation

Mani

Kumar

2013

Int. J. Environ. Sci. Technol.

500

137

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The ability of heavy metals bioaccumulation to cause toxicity in biological systems-human, animals, microorganisms and plants-is an important issue for environmental health and safety. Recent biotechnological approaches for bioremediation include biomineralization (mineral synthesis by living organisms or biomaterials), biosorption (dead microbial and renewable agricultural biomass), phytostabilization (immobilization in plant roots), hyperaccumulation (exceptional metal concentration in plant shoots), dendroremediation (growing trees in polluted soils), biostimulation (stimulating living microbial population), rhizoremediation (plant and microbe), mycoremediation (stimulating living fungi/mycelial ultrafiltration), cyanoremediation (stimulating algal mass for remediation) and genoremediation (stimulating gene for remediation process). The adequate restoration of the environment requires cooperation, integration and assimilation of such biotechnological advances along with traditional and ethical wisdom to unravel the mystery of nature in the emerging field of bioremediation. This review highlights better understanding of the problems associated with the toxicity of heavy metals to the contaminated ecosystems and their viable, sustainable and eco-friendly bioremediation technologies, especially the mechanisms of phytoremediation of heavy metals along with some case studies in India and abroad. However, the challenges (biosafety assessment and genetic pollution) involved in adopting the new initiatives for cleaning-up the heavy metals-contaminated ecosystems from both ecological and greener point of view must not be ignored.

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Section: Systems Biology Approach To Bioremediationmentioning

confidence: 99%

Biotechnological advances in bioremediation of heavy metals contaminated ecosystems: an overview with special reference to phytoremediation

Mani

Kumar

2013

Int. J. Environ. Sci. Technol.

500

137

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“…3, total soluble protein content increased with the increasing Cr +6 concentrations in the (Seth et al, 2008, Szollosi et al 2009). in 100 µM to (p<0.001) 200 µM Cr +6 treated seeds.…”

Section: Resultsmentioning

confidence: 89%

Biochemical Changes under Chromium Stress on Germinating Seedlings of <i>Vigna radiata</i>

SUTHAR¹,

PANSURIYA²,

Kher

et al. 2014

Not Sci Biol

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Hexavalant chromium is considered the most toxic form because of its high solubility in water. Cr is known to induce production of elevated concentration of reactive oxygen species (ROS) resulted in macromolecule damage. Plants are having unique mechanisms to overcome ROS induced damage by accumulation of proline, ascorbate and glutathione and increasing the activities of antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), and ascorbate peroxidaes (APX), peroxidise (POX). In the present investigation effects of chromium on seed germination of Mung bean (Vigna radiata ‛Gujarat Mung-4') were studied. Seeds were treated with different Cr concentrations (50, 100, 150 and 200 μM) for seven days. On 7 th day root and shoot length was measured and activities of antioxidant enzyme SOD, APX, POX, CAT and GR were checked along with protein, proline and lipid peroxidation. It was observed that there is gradual decrease in shoot and root length with respect to the increase in Cr concentration. Level of lipid peroxidation significantly increased along with proline and antioxidant enzyme activity at higher Cr concentration. Lipid peroxidation is an indication of membrane damage due to elevated production of reactive oxygen species (ROS). To combat oxidative damage by ROS antioxidant enzyme activity increased significantly, which indicates that antioxidant enzymes (SOD, CAT, APX and GR) play a crucial role during Cr stress during germination of V. radiata.

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“…The functional significance of a compound as antioxidant achieved through different mechanisms, such as metal chelation, activated oxygen species scavenging, recycling of other antioxidant, inhibition of lipid per oxidation, and repair of damaged DNA molecules caused by oxidative stress (Allen 1995;Seth et al 2008). Among these, scavenging and/or removal of free radicals are the most likely mechanisms for antioxidants mediated tolerance strategy in plants (Seth 2012).…”

Section: Mechanisms Of Metal Tolerance and Detoxification In Plantsmentioning

confidence: 99%

“…Frequent generation of free radicals are taking place during heavy metal stress in accumulating plants and it leads to oxidative stress. Plants have been developed a good tolerance mechanisms against these heavy metal induced oxidative stress via significant synthesis of antioxidants and chelating compounds (Mishra et al 2006;Seth et al 2007Seth et al , 2008. The transformation of toxic forms to less harmful forms is also an approach to detoxifying heavy metals, particularly As, Hg, Fe, Se, and Cr, which exist in a variety of cationic and oxyanionic species and thio-and organo-metallic forms (Meagher 2000;Guerinot and Salt 2001).…”

Section: Mechanisms Of Metal Tolerance and Detoxification In Plantsmentioning

confidence: 99%

Phytoremediation of Toxic Metals in Soils and Wetlands: Concepts and Applications

Rahman

Reichman

Filippis

et al. 2016

Environmental Remediation Technologies for Metal-Contaminated Soils

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Over centuries, industrial, mining and military activities, agriculture, farming, and waste practices have contaminated soils and wetlands in many countries with high concentrations of toxic metals. In addition to their negative effects on ecosystems and other natural resources, toxic metals pose a great danger to human health. Unlike organic compounds, metals cannot be degraded, and clean-up usually requires their removal. Most of the conventional remedial methods have lost economic favor and public acceptance because they are expensive and cause degradation of soil fertility that subsequently results in adverse impacts on the ecosystem. Conventional methods of environmental remediation do not solve the problem; rather they merely transfer it to future generation. Obviously, there is an urgent need for alternative, cheap, and efficient methods to clean-up sites contaminated with toxic metals.Phytoremediation, a plant-based green technology, is cost effective, environmental friendly, aesthetically pleasing approach for the remediation of toxic metals. Due to its elegance and the extent of contaminated areas, phytoremediation approaches have already received significant scientific and commercial attention. Two approaches have been proposed for the phytoremediation of toxic metals

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The role of phytochelatins and antioxidants in tolerance to Cd accumulation in Brassica juncea L.

Cited by 121 publications

References 41 publications

Biotechnological advances in bioremediation of heavy metals contaminated ecosystems: an overview with special reference to phytoremediation

Biotechnological advances in bioremediation of heavy metals contaminated ecosystems: an overview with special reference to phytoremediation

Biochemical Changes under Chromium Stress on Germinating Seedlings of <i>Vigna radiata</i>

Phytoremediation of Toxic Metals in Soils and Wetlands: Concepts and Applications

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