Abstract
Arsenic (As) is one the extremely toxic metalloids that adversely affects health and hence it is categorized under group A human carcinogen. Generally, As-contaminated sites are not remediated due to high cost. Phytoremediation is the process of using plants to treat or clean up contaminated sites and it relies on natural ability of plants to extract, accumulate, or detoxify chemicals from water, soil, and air using energy from sunlight. Over the past several years, significant progress has been made to improve the effectiveness and efficiency of phytoremediation for removal of many hazardous metals from environment. Recent progress in understanding and identification of several genes involved in As uptake, transport, and metabolism in plants led to use of transgenic plants for remediation. Initial experiments of using transgenic plants as a tool to remove As were not promising; however the last decade witnessed a dramatic increase in the reports on the ability of plants to remove/detoxify As. Transgenic plants exploit the natural ability of plants, which rely on uptake of As by roots, transport through vascular system and leaf as a sink to concentrate. An array of genes from different sources including microbes, plants, and animals were successfully used to improve the ability of plants to tolerate, detoxify, and accumulate As. Transgenic plants containing specific genes converted toxic As to other forms that are less harmful. This review examines the recent advances in enhancing phytoremediation through transgenic approach for phytoremediation of As.
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Kumar, S.R., Iyappan, G., Jagadeesan, H., Ramalingam, S. (2017). Genomics and Genetic Engineering in Phytoremediation of Arsenic. In: Gupta, D., Chatterjee, S. (eds) Arsenic Contamination in the Environment. Springer, Cham. https://doi.org/10.1007/978-3-319-54356-7_8
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