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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 Bowman
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.

History

Publication title

Strategic Science in Antarctica 2013 Conference

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

SSA

Place of publication

Australia

Event title

Strategic Science in Antarctica 2013 Conference

Event Venue

Hobart, Australia

Date of Event (Start Date)

2013-06-24

Date of Event (End Date)

2013-06-28

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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    University Of Tasmania

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