Science News

What delayed the oxygenation of the Earth? New study provides clues

The chlorophyll photosynthesis implemented by plants began on Earth, according to various tests, already 3 billion years ago. However, oxygenation of the atmosphere seems to have occurred much later than the beginning of photosynthesis by plants, a process that in itself releases oxygen.

This is an enigma that geologists have not been able to solve, as recalled by Christopher Reinhard, a researcher at the Georgia Institute of Technology who, through a new study, conducted together with researcher Kazumi Ozaki and other colleagues, has tried to clarify the question a bit.

The researchers say they have discovered “that photosynthetic bacteria that use iron instead of water are fierce competitors for light and nutrients,” says Ozaki himself, now a researcher at the University of Toho, Japan.

This means that in the oceans of the primordial Earth the photosynthesizers that release oxygen could not effectively compete with their more primitive counterparts, ie those that consumed dissolved iron ions, very abundant elements on the primordial Earth.

These counterparts produced rust as a by-product instead of oxygen. For a long time, therefore, these photosynthesizers were able to overcome the photosynthesizers that produced oxygen.

The study was published in Nature Communications where it is available in complete form.

John Sanchez

I am a graduate student at Southern Illinois University with a major in Computer Science and Mathematics. I have contributed to numerous open-source libraries including Tensorflow and Numpy, and hope to move into a professional developer role after graduation. Contributing to Bridgestone News Room is a hobby of mine and I will contribute a story every 1-2 weeks whenever I come across an area of new research that I believe would be of interest to our readers.

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John Sanchez