Abstract
Isolation of five ionizing radiation (IR)-resistant bacteria by screening of isolates from various habitats classified as common and stressed is reported. IR-resistant isolates exhibited varying degrees of resistance to γ-radiation and were classified as highly and moderately radiation resistant. Resistance to ultraviolet (UV) radiation correlated well with γ-radiation resistance, whereas a comparable desiccation resistance for all the highly and moderately radiation-resistant isolates was observed. However, salt tolerance failed to correlate with IR resistance, indicating a divergent evolution of the salt tolerance and radiation resistance. Characterization of isolates by the amplified rDNA restriction analysis profiling attested to the clustering of these isolates with their stress phenotype. 16S rRNA gene-based analysis of the isolates showed that the bacteria with similar-resistance physiologies clustered together and belonged to related genera. Hydrogen peroxide resistance and mitomycin survival patterns of the isolates indicated the roles of oxidative-stress tolerance in desiccation survival and recombination repair in higher radiation resistance, respectively.
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Acknowledgments
This work was supported by the Board of Research in Nuclear Sciences Grant No. BRNS-2002/35, Department of Atomic Energy, India,. to A.J.D. The support of Dr. Harish Padh for the use of the Co60 Gamma Irradiator Facility at PERD, Ahmedabad and of the Council of Scientific and Industrial Research, India, Junior Research Fellowship to R.C. is acknowledged.
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Shukla, M., Chaturvedi, R., Tamhane, D. et al. Multiple-Stress Tolerance of Ionizing Radiation-Resistant Bacterial Isolates Obtained from Various Habitats: Correlation Between Stresses. Curr Microbiol 54, 142–148 (2007). https://doi.org/10.1007/s00284-006-0311-3
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DOI: https://doi.org/10.1007/s00284-006-0311-3