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Oxygen levels in the air do not limit plant productivity, researchers find

Date:
February 18, 2011
Source:
Ume University
Summary:
There have been concerns that present oxygen levels may limit plant productivity. Researchers in Sweden show that this is not the case in a new study. The results are encouraging since they demonstrate that plans for future biomass and solar fuels production are not limited by this effect.

There have been concerns that present oxygen levels may limit plant productivity. Researchers at Ume University show that this is not the case in a new study published in the Proceedings of the National Academy of Sciences. The results are encouraging since they demonstrate that plans for future biomass and solar fuels production are not limited by this effect.

Do increased oxygen levels limit oxygen production by photosynthesis? Is this unique process adapted to the low oxygen levels that existed when photosynthesis evolved nearly three billion years ago? These questions have generated vivid discussions in the academic world.

Now Ume researchers together with colleagues at the University of Osnabrueck, Germany, can settle the debate. Increased levels of oxygen in the air do not directly inhibit photosynthesis. "If photosynthetic productivity was directly inhibited by increased oxygen levels it would have severe consequences. It would limit the plans to use biomass and artificial photosynthesis as future means to produce fuel in a sustainable way, since more photosynthesis by plants, photosynthetic bacteria and artificial catalysts would lead to more oxygen, especially locally within bioreactors or artificial devices," says Johannes Messinger, professor at the Department of Chemistry at Ume University.

In the present study, the researchers employed a mass spectrometric technique together with isotopic water (H218O) to probe the effect of increased concentrations of oxygen on the mechanism of water splitting. Water splitting is a complicated reaction which takes place in a large protein complex, called photosystem 2. The absorbed light energy is used to split two water molecules at a time into one molecule of molecular oxygen and four protons. "We increased the oxygen pressure up to 50 times over ambient conditions. This did not lead to a block of oxygen evolution from water by photosystem 2," says Johannes Messinger.

Researchers at Ume University's Solar Fuels Environment as well as other researchers worldwide are trying to unravel all required details from the photosynthesis. Their goal is to be able to build manmade devices that, by employing the same principles as photosynthesis, are able to store solar energy in fuels such as hydrogen or ethanol.


Story Source:

The above story is based on materials provided by Ume University. Note: Materials may be edited for content and length.


Journal Reference:

  1. D. Shevela, K. Beckmann, J. Clausen, W. Junge, J. Messinger. Membrane-inlet mass spectrometry reveals a high driving force for oxygen production by photosystem II. Proceedings of the National Academy of Sciences, 2011; DOI: 10.1073/pnas.1014249108

Cite This Page:

Ume University. "Oxygen levels in the air do not limit plant productivity, researchers find." ScienceDaily. ScienceDaily, 18 February 2011. <www.sciencedaily.com/releases/2011/02/110217083121.htm>.
Ume University. (2011, February 18). Oxygen levels in the air do not limit plant productivity, researchers find. ScienceDaily. Retrieved April 17, 2014 from www.sciencedaily.com/releases/2011/02/110217083121.htm
Ume University. "Oxygen levels in the air do not limit plant productivity, researchers find." ScienceDaily. www.sciencedaily.com/releases/2011/02/110217083121.htm (accessed April 17, 2014).

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