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Ocean bacteria can harvest energy from sunlight for survival

Date:
May 3, 2010
Source:
Public Library of Science
Summary:
Bacteria in the ocean can harvest light energy from sunlight to promote survival thanks to a unique photoprotein, according to research by a team of scientists in Sweden and Spain.

Various colony morphologies and coloration of different proteorhodopsin-containing bacteria used to study proteorhodopsin phototrophy.
Credit: The Light-Driven Proton Pump Proteorho- dopsin Enhances Bacterial Survival during Tough Times. PLoS Biology, 2010; 8(4): e1000359 DOI: 10.1371/journal.pbio.1000359

Bacteria in the ocean can harvest light energy from sunlight to promote survival thanks to a unique photoprotein.

This novel finding by a team of scientists in Sweden and Spain is published in the online, open access journal PLoS Biology.

"It was long thought that phytoplankton were the only organisms in the sea that could harvest the energy from sunlight for growth," says Dr. Jarone Pinhassi, scientist in marine microbiology at Linnaeus University, Sweden. These microscopic planktonic organisms carry out the same chlorophyll driven photosynthesis process as green plants on land.

In 2000, American scientists discovered that many marine bacteria contain a gene in their genome that encodes a new kind of light-harvesting pigment: proteorhodopsin. Proteorhodopsin is related to the pigment in the retina that enables human vision in less intense light. Now, a decade later, the first direct evidence for the functioning of proteorhodopsin in native marine bacteria is presented, based on mutational analysis in a marine bacterium. At the same time the present study shows that proteorhodopsin-mediated phototrophy (the process of acquiring energy from light) allows marine bacteria to better survive periods of starvation in an often nutrient-depleted ocean.

The importance of understanding novel mechanisms for marine bacteria to efficiently use solar energy is obvious if one considers that a liter of seawater on average contains around a billion bacteria, many of which contain proteorhodopsin. The activity of these bacteria play a crucial role in the global carbon cycle by determining oceanic production of CO2 through respiration and determining how the fluxes of energy that are fixed by photosynthesis are channeled through marine food chains.

"Bacteria in the surface ocean are swimming in a sea of light, and it may not be all that surprising that evolution has favored microorganisms that can use this abundant energy source," says Pinhassi.

Funding was provided by The Swedish Research Councils VR and FORMAS, The Swedish governmental strong research programme Ecochange, The Swedish Strategic Science Foundation, The Crafoord Foundation, and The Spanish Ministerio de Educacion y Ciencia.


Story Source:

The above story is based on materials provided by Public Library of Science. Note: Materials may be edited for content and length.


Journal References:

  1. Laura G๓mez-Consarnau, Neelam Akram, Kristoffer Lindell, Anders Pedersen, Richard Neutze, Debra L. Milton, Jos้ M. Gonzแlez, Jarone Pinhassi. Proteorhodopsin Phototrophy Promotes Survival of Marine Bacteria during Starvation. PLoS Biology, 2010; 8(4): e1000358 DOI: 10.1371/journal.pbio.1000358
  2. Edward F. DeLong, Oded B้jเ. The Light-Driven Proton Pump Proteorho- dopsin Enhances Bacterial Survival during Tough Times. PLoS Biology, 2010; 8(4): e1000359 DOI: 10.1371/journal.pbio.1000359

Cite This Page:

Public Library of Science. "Ocean bacteria can harvest energy from sunlight for survival." ScienceDaily. ScienceDaily, 3 May 2010. <www.sciencedaily.com/releases/2010/04/100427171754.htm>.
Public Library of Science. (2010, May 3). Ocean bacteria can harvest energy from sunlight for survival. ScienceDaily. Retrieved April 21, 2014 from www.sciencedaily.com/releases/2010/04/100427171754.htm
Public Library of Science. "Ocean bacteria can harvest energy from sunlight for survival." ScienceDaily. www.sciencedaily.com/releases/2010/04/100427171754.htm (accessed April 21, 2014).

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