Original Research ARTICLE
Terrestrial Plants Evolve Highly-Assembled Photosystem Complexes in Adaptation to Light Shifts
- 1Sichuan Agricultural University, China
- 2Sichuan University, China
- 3Yangzhou University, China
- 4Sichuan Academy of Agricultural Sciences, China
It has been known that PSI and PSII supercomplexes are involved in the linear and cyclic electron transfer, dynamics of light capture, and the repair cycle of PSII under environmental stresses. However, evolution of photosystem (PS) complexes from evolutionarily divergent species is largely unknown. Here we improved the blue native polyacrylamide gel electrophoresis (BN-PAGE) separation method and successfully separated PS complexes from all terrestrial plants. It is well-known that reversible D1 protein phosphorylation is an important protective mechanism against oxidative damages to chloroplasts through the PSII photoinhibition-repair cycle. The results indicate that antibody-detectable phosphorylation of D1 protein is the latest event in the evolution of PS protein phosphorylation and occurs exclusively in seed plants. Compared to angiosperms, other terrestrial plant species presented much lower contents of PS supercomplexes. The amount of light-harvesting complexes II (LHCII) trimers was higher than that of LHCII monomers in angiosperms, whereas it was opposite in gymnosperms, pteridophytes and bryophytes. LHCII assembly may be one of the evolutionary characteristics of vascular plants. In-vivo chloroplast fluorescence measurements indicated that lower plants (bryophytes especially) showed slower changes in state transition and nonphotochemical quenching (NPQ) in response to light shifts. Therefore, the evolution of PS supercomplexes may be correlated with their acclimations to environments.
Keywords: LHCII assembly, Nonphotochemical quenching, Phosphorylation, photosystem evolution, PS supercomplexes, State transition
Received: 24 May 2018;
Accepted: 21 Nov 2018.
Edited by:Marian Brestic, Slovak University of Agriculture, Slovakia
Reviewed by:Ankush Prasad, Palacký University, Olomouc, Czechia
Steffen Reinbothe, Université Grenoble Alpes, France
Copyright: © 2018 Chen, Su, Mao, Nan, Zhu, Yuan, Zhang, Liu and Yuan. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Prof. Shu Yuan, Sichuan Agricultural University, Ya'an, China, email@example.com