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Light stimulated growth of proteorhodopsin bearing sea-ice psychrophile Psychroflexus torquis is salinity-dependent
conference contribution
posted on 2023-05-24, 11:53 authored by Feng, S, Shane PowellShane Powell, Richard WilsonRichard Wilson, John BowmanJohn BowmanProteorhodopsins (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.
History
Publication title
Strategic Science in Antarctica 2013 ConferenceDepartment/School
Tasmanian Institute of Agriculture (TIA)Publisher
SSAPlace of publication
AustraliaEvent title
Strategic Science in Antarctica 2013 ConferenceEvent Venue
Hobart, AustraliaDate of Event (Start Date)
2013-06-24Date of Event (End Date)
2013-06-28Repository Status
- Restricted