Talk:Photosystem

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Which evolved first?

There is a conflict in some of the sources:

Photosystem II (so numbered because, while it was most likely the first to evolve, it was the second one discovered).

Photosystem I evolved very early; photosystem II evolved later.

Any idea which oorrect? Looks like PSI evolved prior to PSII. --Michael C. Price ^talk 20:37, 11 April 2008 (UTC)[reply]

I've been trying to find a definite answer on this in the literature. Most of what I can find indicates that both systems evolved from a common anscestor and show high genetic conservation. The reference in the text links to an article where the assertion is just arbitarily made, without support. The website appears to be that of a community college, rather than a research institute. To me, this means that one can't be said to have evolved earlier, let alone much earlier, so I'm going to remove the statement. - Rob —Preceding unsigned comment added by 144.82.37.231 (talk) 14:35, 28 October 2008 (UTC)[reply]

I think the general consensus is they both derive from a common ancestor and diverged after an early gene duplication event. See Allen JF (2005) A redox switch hypothesis for the origin of two light reactions in photosynthesis. FEBS Lett., 579: 963-968. Silasmellor (talk) 08:55, 21 April 2010 (UTC)[reply]

"Photosystem I" redirects here

Is there any reason that PSI doesn't have a dedicated page when PSII most of the other components of the LDR do? Jrowe2k (talk) 19:38, 19 March 2009 (UTC)[reply]

This article seriously needs some pictures

Kelvinsong (talk) 20:17, 26 October 2012 (UTC)[reply]