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By R.A. Sharma

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The transgenic plant could grow on 10-fold higher methyl mercury than the wild type. , 1996). thaliana made the plant to grow on 50-fold methyl mercury. ,1999 & 2000). coli led to higher arsenic (As) tolerance and 4-17 fold higher arsenic hyperaccumulation in shoots. , 2002). (e)' Transfer and over-expression of gene NiR cDNA synthesizing the enzyme 'nitrate reductase' into A. thaliana led to 40 % increase in assimilation of nitrogen dioxide (N02)· . 7. Transgenic tobacco (Nicotiana tabaccum) plant was produced by transferring bacteri~l nitroreductase gene (pNITRED3).

3. 4. 5. 6. , 2000; Prasad, 2006). Phytodetoxification of Toxic Cyanide (CN) by Phytotransformation Plants possess the necessary mechanism to detoxify the cyanides from mmmg wastes resulting from gold & silver mining. Cyanide (ammonium thiocyanate) is the leach reagent of choice for gold (Au) and silver (A g) extraction. During several metabolic functions, plants are confronted with cyanide as a byproduct of metabolism. This occurs particularly during synthesis of 'ethylene' in mature tissues, where 'hydrogen cyanide' (HCN) is formed as byproduct.

They are specific. Molecular study for alteration of such genes (2nT1) for transport of other metals may be useful for enhancing phytoextraction. 5. RTP1) mediate the uptake of Na+ and Cd 2+in yeast cells. Therefore, the transfer of such gene (IRT1) to plants may enhance the uptake of metal ions by the plant roots. 'SYMBIOTIC ENGINEERING' : NOVEL BIOTECHNOLOGY FOR HEAVY METAL BIOREMEDIATION BY LEGUME-BACTERIA SYMBIOSIS A novel bioremediation system for heavy metals using the symbiotic relationship between leguminous plant and genetically engineered rhizobia bacteria has been suggested by Sriprang et al.

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