niiicholas
Posts: 319
Joined: May 2002
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PvM found some good refs:
Talk.origins references
| Quote | COMPLEX EVOLUTION OF PHOTOSYNTHESIS in Annual Review of Plant Biology Jun 2002, Vol. 53, pp. 503-521 by Xiong and Bauer
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Abstract The origin of photosynthesis is a fundamental biological question that has eluded researchers for decades. The complexity of the origin and evolution of photosynthesis is a result of multiple photosynthetic components having independent evolutionary pathways. Indeed, evolutionary scenarios have been established for only a few photosynthetic components. Phylogenetic analysis of Mg-tetrapyrrole biosynthesis genes indicates that most anoxygenic photosynthetic organisms are ancestral to oxygen-evolving cyanobacteria and that the purple bacterial lineage may contain the most ancestral form of this pigment biosynthesis pathway. The evolutionary path of type I and type II reaction center apoproteins is still unresolved owing to the fact that a unified evolutionary tree cannot be generated for these divergent reaction center subunits. However, evidence for a cytochrome b origin for the type II reaction center apoproteins is emerging. Based on the combined information for both photopigments and reaction centers, a unified theory for the evolution of reaction center holoproteins is provided. Further insight into the evolution of photosynthesis will have to rely on additional broader sampling of photosynthesis genes from divergent photosynthetic bacteria.
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Clues to the evolution of photosynthesis Sequenced genome of Chlorobium tepidum
Bauer Lab
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