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University of Pune (2008)

Studies on metal tolerance in plants

Kumar, Sunil

Titre : Studies on metal tolerance in plants

Auteur : Kumar, Sunil

University : University of Pune

Grade : Doctor of Philosophy (PhD) 2008

Some metals at lower concentration are essential for cells but all metals are toxic at higher concentrations. Heavy metal pollution of soil and water caused by mining, burning of fossils fuels, smelting of metalliferous ores, and agriculture waste, is a major environment problem and exposure to these metals can be toxic to living cells. Use of plants for decontamination/minimization of heavy metal pollutants has attracted attention because of the problems associated with pollutant removal using conventional methods such as soil replacement, solidification, electro-kinetic extraction and washing strategies. Phytoremediation is a cost effective emerging technology based on the use of green plants to clean up the polluted sites and is accepted publicly. Research efforts made towards understanding the mechanism of metal tolerance has generated a great deal of information but it remains ill understood. Thus, there is scope for research to understand the mechanism of metal tolerance by various plant species and to identify the site and form of metal accumulation within plant system. This thesis entitled “Studies on Metal Tolerance in Plants” was designed to study the metal stress on different plant species including a herb (Peanut), a shrub (Jojoba) and a tree (Pongamia). Peanut (Arachis hypogaea L.) is a unique leguminous plant for its characteristic behavior to produce the pods underground in direct contact with soil. It has the double advantage for absorption of Cd from soil through roots and directly through the shells. Jojoba (Simmondsia chinensis) is an industrial crop – its seed wax is used in the cosmetic industry, as a lubricant, etc. The crop has considerable potential for cultivation in arid and semi-arid regions. In vitro nodal segments of jojoba respond to salinity in a similar way as the whole plant, so plant tissue culture technique could be used for preselection and evaluation of metal tolerance in this species.

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