Mahapatra, N. R. and Banerjee, P. C. (1996) Extreme tolerance to cadmium and high resistance to copper, nickel and zinc in different Acidiphilium strains. Letters In Applied Microbiology, 23. pp. 393-397.
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Abstract
Interaction of metals and microbes is widespread in nature, and causes diverse changes in the earth's biosphere including formation and solubilization of minerals (Ehrlich 1981; Poole and Gadd 1989). Several metals are essential for growth, metabolism and differentiation of both prokaryotic and eukaryotic cells whereas the majority of them are not known to have any indispensable biological functions (Gadd 1992). The growth requirement for essential heavy metals is normally very low, and at a few mmol l-1 or lower concentrations many of these heavy metals, both essential and non-essential, show toxicity in a wide range of living systems (Fergusson 1990). However, natural tolerance to one or more of these metals occurs in many bacteria with sufficiently high frequencies even in the absence of frequent exposure to any obvious source of metals which may facilitate selection of resistant cells in a population (Silver and Misra 1988). As an example, we report here the extremely high natural tolerance to Cd, and resistance to Cu, Ni and Zn in some Acidiphilium strains which are Gram-negative, aerobic, mesophilic, acidophilic heterotrophs of acidic mine environment (Harrison 1981), and had been cultured in the laboratory for several years in simple medium devoid of any heavy metal.
| Item Type: | Article |
|---|---|
| Additional Information: | The authors express their sincere gratitude to Professor A.P. Harrison Jr, University of Missouri, Columbia, USA, Dr N. Wakao, Iwate University, Morioka, Japan, and Dr N. Kishimoto, Mimasaka Women's Junior College, Tsuyama, Okayama, Japan, for providing the bacterial strains. NRM is thankful to CSIR, New Delhi, for a fellowship. |
| Author Affiliation: | Indian Institute of Chemical Biology, Calcutta, India |
| Subjects: | Crop Improvement |
| Divisions: | General |
| Depositing User: | Mr Siva Shankar |
| Date Deposited: | 08 May 2012 04:51 |
| Last Modified: | 08 May 2012 04:51 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/5148 |
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