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Applied and Environmental Microbiology, May 2007, p. 3077-3083, Vol. 73, No. 9
0099-2240/07/$08.00+0     doi:10.1128/AEM.00085-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Cold-Active Chemoorganotrophic Bacteria from Permanently Ice-Covered Lake Hoare, McMurdo Dry Valleys, Antarctica{triangledown}

Kate M. Clocksin, Deborah O. Jung, and Michael T. Madigan*

Department of Microbiology, Southern Illinois University, Carbondale, Illinois 62901

Received 13 January 2007/ Accepted 6 March 2007

Eight strains of chemoorganotrophic bacteria were isolated from the water column of Lake Hoare, McMurdo Dry Valleys, Antarctica, using cold enrichment temperatures. The isolates were Alpha-, Beta-, and Gammaproteobacteria and Actinobacteria spp. All isolates grew at 0°C, and all but one grew at subzero temperatures characteristic of the water column of Lake Hoare. Growth temperature optima varied among isolates, but the majority showed optima near 15°C, indicative of cold-active phenotypes. One isolate was truly psychrophilic, growing optimally around 10°C and not above 20°C. Half of the isolates grew at 2% salt while the other half did not, and all but one isolate grew at 2 atm of O2. Our isolates are the first prokaryotes from the water column of Lake Hoare to be characterized phylogenetically and physiologically and show that cold-active species of at least two major phyla of Bacteria inhabit Lake Hoare.

* Corresponding author. Mailing address: Department of Microbiology, Southern Illinois University, MC 6508, 1125 Lincoln Dr., Carbondale, IL 62901. Phone and fax: (618) 453-5130. E-mail: madigan{at}micro.siu.edu

{triangledown} Published ahead of print on 16 March 2007.

Applied and Environmental Microbiology, May 2007, p. 3077-3083, Vol. 73, No. 9
0099-2240/07/$08.00+0     doi:10.1128/AEM.00085-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.





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