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Title: Integrated biological approach for the enhanced degradation of lindane
Authors: Nagpal, Varima
Paknikar, K M
Keywords: lindane
root exudates,
Issue Date: Jul-2006
Publisher: CSIR
Series/Report no.: Int. Cl.<sup>8</sup> B09C1/10
Abstract: Lindane is a persistent organic pollutant (POP) and its removal from various environmental compartments is a global priority. In the present study, three lindane degrading bacterial cultures, viz. <i style="">Pseudoarthrobacter </i>sp., <i style="">Pseudomonas </i>sp. and <i style="">Klebsiella </i>sp., were selected from among ten isolates obtained from lindane-exposed soils by enrichment culture technique. The cultures exhibited a maximum lindane degradation efficiency of ~50%, having little significance in bioremediation. However, in the presence of protozoa (ciliates) obtained from the same enrichment culture, lindane degradation efficiency of bacterial cultures increased to the tune of 90-92% with concomitant formation of 1,2,4-trichlorobenzene, a key degradation product. Lindane degradation by the bacterial cultures was also found to get enhanced by 10-15% in the presence of root exudates of lindane-tolerant plants, viz. corn, chili and coriander, even though these plants were unable to uptake any lindane and thus were unsuitable for phytoremediation <i style="">per se</i>. These data highlight the need for an intensive investigation on (a) bacteria-protozoa interactions for bioremediation of POPs and (b) use of POP-degrading bioinoculants in the rhizospheric soil of resistant plants as a possible alternative, in the absence of a viable conventional remedial option.
Description: 400-406
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Appears in Collections:IJBT Vol.05(3) [July 2006]

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