Review

Planta

, Volume 237, Issue 2, pp 399-412

Phylogenetic viewpoints on regulation of light harvesting and electron transport in eukaryotic photosynthetic organisms

  • Irina GrounevaAffiliated withMolecular Plant Biology, University of Turku
  • , Peter J. GollanAffiliated withMolecular Plant Biology, University of Turku
  • , Saijaliisa KangasjärviAffiliated withMolecular Plant Biology, University of Turku
  • , Marjaana SuorsaAffiliated withMolecular Plant Biology, University of Turku
  • , Mikko TikkanenAffiliated withMolecular Plant Biology, University of Turku
  • , Eva-Mari AroAffiliated withMolecular Plant Biology, University of Turku Email author 

Abstract

The comparative study of photosynthetic regulation in the thylakoid membrane of different phylogenetic groups can yield valuable insights into mechanisms, genetic requirements and redundancy of regulatory processes. This review offers a brief summary on the current understanding of light harvesting and photosynthetic electron transport regulation in different photosynthetic eukaryotes, with a special focus on the comparison between higher plants and unicellular algae of secondary endosymbiotic origin. The foundations of thylakoid structure, light harvesting, reversible protein phosphorylation and PSI-mediated cyclic electron transport are traced not only from green algae to vascular plants but also at the branching point between the “green” and the “red” lineage of photosynthetic organisms. This approach was particularly valuable in revealing processes that (1) are highly conserved between phylogenetic groups, (2) serve a common physiological role but nevertheless originate in divergent genetic backgrounds or (3) are missing in one phylogenetic branch despite their unequivocal importance in another, necessitating a search for alternative regulatory mechanisms and interactions.

Keywords

Cyclic/linear electron flow Diatoms Light-harvesting proteins Red lineage Reversible phosphorylation of thylakoid proteins PGR5 STN7