Mechanism of Plant Tolerance in Response to Heavy Metals



Heavy metal (HM) toxicity is one of the major abiotic stresses leading to hazardous effects in plants. A common consequence of heavy metal toxicity is the excessive accumulation of reactive oxygen species (ROS) and methylglyoxal (MG). These events are a cascade which finally leads to peroxidation of lipids, oxidation of protein, inactivation of enzymes, DNA damage, and/or interaction with other vital constituents of plant cells. Plants respond to heavy metal toxicity in a variety of different ways. Such responses include immobilization, exclusion, chelation and compartmentalization of the metal ions, and the expression of more general stress response mechanisms such as ethylene and stress proteins. This potential of plants to sustain in toxic conditions by detoxifying the heavy metals has been explored to mitigate the damage done to nature by emerging technology known as phytoremediation. Phytorem means those plants which are recommended to detoxify metals and metalloid from environment and soil. Growing plants at the contaminated sites over a number of years aim either to remove pollutants from the contaminated sites or to alter the chemical and physical nature of the contaminant so that they no longer present a risk to human health and environment.


Heavy Metal Heavy Metal Toxicity Nitrate Reductase Activity Metal Tolerance Heavy Metal Stress 
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© Springer India 2013

Authors and Affiliations

  1. 1.Bim College of Professional StudiesGwaliorIndia

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