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Light stimulated growth of proteorhodopsin bearing sea-ice psychrophile Psychroflexus torquis is salinity-dependent
Citation
Feng, S and Powell, S and Wilson, RR and Bowman, JP, Light stimulated growth of proteorhodopsin bearing sea-ice psychrophile Psychroflexus torquis is salinity-dependent, Strategic Science in Antarctica 2013 Conference, 24-28 June 2013, Hobart, Australia (2013) [Conference Extract]
Abstract
Proteorhodopsins (PRs) are commonly found in marine prokaryotes and allow microbes to use light as an energy source. In recent studies it was reported that PR stimulates growth and survival under nutrient-limited conditions. In this study we tested the effect of nutrient and salinity stress on the extremely psychrophilic sea-ice bacterial species Psychroflexus torquis, which possesses PR. We demonstrated for the first time that light stimulated growth occurs under conditions of salinity stress rather than nutrient limitation and that elevated salinity is related to increased growth yields, PR levels and associated proton pumping activity. PR abundance in P. torquis also is post-transcriptionally regulated by both light and salinity and thus could represent an adaptation to its sea-ice habitat. Our findings extend the existing paradigm that light provides an energy source for marine prokaryotes under stress conditions other than nutrient limitation.
Item Details
Item Type: | Conference Extract |
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Research Division: | Biological Sciences |
Research Group: | Microbiology |
Research Field: | Microbiology not elsewhere classified |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the environmental sciences |
UTAS Author: | Feng, S (Mr Shi Feng) |
UTAS Author: | Powell, S (Dr Shane Powell) |
UTAS Author: | Wilson, RR (Dr Richard Wilson) |
UTAS Author: | Bowman, JP (Associate Professor John Bowman) |
ID Code: | 85206 |
Year Published: | 2013 |
Deposited By: | Tasmanian Institute of Agriculture |
Deposited On: | 2013-06-18 |
Last Modified: | 2014-04-29 |
Downloads: | 0 |
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