open access

https://hdl.handle.net/2115/65100

Evolution of Green Plants Accompanied Changes in Light-Harvesting Systems

英語

Photosystem

2016-04-06

Oxford University Press

Plant and Cell Physiology

57(6)

1231-1243

Photosynthetic organisms have various pigments enabling them to adapt to various light environments. Green plants are divided into two groups: streptophytes and chlorophytes. Streptophytes include some freshwater green algae and land plants, while chlorophytes comprise the other freshwater green algae and seawater green algae. The environmental conditions driving the divergence of green plants into these two groups and the changes in photosynthetic properties accompanying their evolution remain unknown. Here, we separated the core antennae of PSI and the peripheral antennae [light-harvesting complexes (LHCs)] in green plants by green-native gel electrophoresis and determined their pigment compositions. Freshwater green algae and land plants have high Chl a/b ratios, with most Chl b existing in LHCs. In contrast, seawater green algae have low Chl a/b ratios. In addition, Chl b exists not only in LHCs but also in PSI core antennae in these organisms, a situation beneficial for survival in deep seawater, where blue-green light is the dominant light source. Finally, low-energy Chl (red Chl) of PSI was detected in freshwater green algae and land plants, but not in seawater green algae. We thus conclude that the different level of Chl b accumulation in core antennae and differences in PSI red Chl between freshwater and seawater green algae are evolutionary adaptations of these algae to their habitats, especially to high-or low-light environments.

学術雑誌論文

Accepted Manuscript

This is a pre-copyedited, author-produced PDF of an article accepted for publication in Plant and Cell Physiology following peer review. The version of record Plant Cell Physiol. 57(6): 1231–1243 (2016) doi: 10.1093/pcp/pcw071 is available online at http://pcp.oxfordjournals.org/content/57/6/1231

0032-0781