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From: RonO <rokimoto557@gmail.com>
Newsgroups: talk.origins
Subject: Re: Country roads revisited - life is old there..OLDER than the
 mountains...
Date: Mon, 29 Jul 2024 08:56:12 -0500
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On 7/29/2024 5:28 AM, burkhard wrote:
> according to this new, but heavily disputed research on how old
> complex life on Earth is
> 
> https://www.bbc.co.uk/news/articles/c3geyvpxpeyo
> 

https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.16249

This paper indicates that aerobic photosynthesis may have evolved a 
billion years before the great Oxidation event 2.3 billion years ago 
(could have evolved over 3 billion years ago).  It looks like anoxygenic 
photosynthesis evolved first and the Oxigenic photosystem cores evolved 
from anoxygenic cores.  A recent paper that I put up indicated that 
cyanobacteria evolved nitrogen fixation before they evolved oxygenic 
photosynthesis.  This means that it was an uphill climb for oxigenic 
photosynthesis when vital systems needed anaerobic conditions to 
function.  Chemotrophes are anaerobic, so oxygen was poison to lifeforms 
when oxygenic photosynthesis evolved, even to the cyanobacteria that 
evolved the system.  Anoxygenic photosynthetic bacteria still exist in 
oxygen poor environments.

The fact that all life was adapted to anaerobic conditions could have 
delayed the great oxidation event for a billion years.  No one wanted 
oxydative phototrophes for neighbors, not even the oxidative 
phototrophes that fixed nitrogen that had to deal with self inflicted 
oxygen generation.

Ron Okimoto