scholarly journals Photosystem ratio imbalance promotes direct sustainable H2 production in Chlamydomonas reinhardtii

2019 ◽  
Vol 21 (17) ◽  
pp. 4683-4690 ◽  
Author(s):  
Pilla Sankara Krishna ◽  
Stenbjörn Styring ◽  
Fikret Mamedov
Keyword(s):  
Photosystem Ii ◽  
Chlamydomonas Reinhardtii ◽  
Photosystem I ◽  
H2 Production

Changes in the photosystem I/photosystem II ratio promote sustainable H2 production in C. reinhardtii in a standard TAP medium.

scholarly journals Chlorophyll triplet states associated with Photosystem I and Photosystem II in thylakoids of the green alga Chlamydomonas reinhardtii

2007 ◽  
Vol 1767 (1) ◽  
pp. 88-105 ◽  
Author(s):  
Stefano Santabarbara ◽  
Giancarlo Agostini ◽  
Anna Paola Casazza ◽  
Christopher D. Syme ◽  
P. Heathcote ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Chlamydomonas Reinhardtii ◽  
Green Alga ◽  
Photosystem I ◽  
Triplet States

scholarly journals The dependence of algal H2 production on Photosystem II and O2 consumption activities in sulfur-deprived Chlamydomonas reinhardtii cells

2003 ◽  
Vol 1607 (2-3) ◽  
pp. 153-160 ◽  
Author(s):  
T.K. Antal ◽  
T.E. Krendeleva ◽  
T.V. Laurinavichene ◽  
V.V. Makarova ◽  
M.L. Ghirardi ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Chlamydomonas Reinhardtii ◽  
H2 Production ◽  
O2 Consumption

scholarly journals Evidence for thylakoid membrane fusion during zygote formation in Chlamydomonas reinhardtii.

1991 ◽  
Vol 114 (5) ◽  
pp. 905-915 ◽  
Author(s):  
B Baldan ◽  
J Girard-Bascou ◽  
F A Wollman ◽  
J Olive
Keyword(s):  
Photosystem Ii ◽  
Chlamydomonas Reinhardtii ◽  
Photosystem I ◽  
Thylakoid Membrane ◽  
De Novo ◽  
Electron Flow ◽  
Thylakoid Membranes ◽  
Structural Basis ◽  
Zygote Formation ◽  
Thin Sections

To understand whether fusions of thylakoid membranes from the parental chloroplasts occurred during zygote formation in Chlamydomonas reinhardtii, we performed an ultrastructural analysis of the zygotes produced by crossing mutants lacking photosystem I or II protein complexes, in the absence of de novo chloroplast protein synthesis. Thylakoid membranes from each parent could be distinguished on thin sections due to their organization in "supergrana" in mutants lacking photosystem I centers, by freeze-fracturing due to the absence of most of the exoplasmic-face (EF) particles in mutants lacking photosystem II centers, by immunocytochemistry using antibodies directed against photosystem II subunits. We demonstrate that a fusion of the thylakoid membranes occurred during zygote formation approximately 15 h after mating. These fusions allowed a lateral redistribution of the thylakoid membrane proteins. These observations provide the structural basis for the restoration of photosynthetic electron flow in the mature zygote that we observed in fluorescence induction experiments.

Dichromate effect on energy dissipation of photosystem II and photosystem I in Chlamydomonas reinhardtii

2009 ◽  
Vol 96 (1) ◽  
pp. 24-29 ◽  
Author(s):  
François Perreault ◽  
Nadia Ait Ali ◽  
Cyril Saison ◽  
Radovan Popovic ◽  
Philippe Juneau
Keyword(s):  
Energy Dissipation ◽  
Photosystem Ii ◽  
Chlamydomonas Reinhardtii ◽  
Photosystem I

scholarly journals LHCSR1-dependent fluorescence quenching is mediated by excitation energy transfer from LHCII to photosystem I in Chlamydomonas reinhardtii

2018 ◽  
Vol 115 (14) ◽  
pp. 3722-3727 ◽  
Author(s):  
Kotaro Kosuge ◽  
Ryutaro Tokutsu ◽  
Eunchul Kim ◽  
Seiji Akimoto ◽  
Makio Yokono ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Photosystem Ii ◽  
Fluorescence Quenching ◽  
Excitation Energy ◽  
Chlamydomonas Reinhardtii ◽  
Photosystem I ◽  
Excitation Energy Transfer ◽  
High Light ◽  
Light Harvesting Complexes ◽  
Photosynthetic Organisms

Photosynthetic organisms are frequently exposed to light intensities that surpass the photosynthetic electron transport capacity. Under these conditions, the excess absorbed energy can be transferred from excited chlorophyll in the triplet state (3Chl*) to molecular O2, which leads to the production of harmful reactive oxygen species. To avoid this photooxidative stress, photosynthetic organisms must respond to excess light. In the green alga Chlamydomonas reinhardtii, the fastest response to high light is nonphotochemical quenching, a process that allows safe dissipation of the excess energy as heat. The two proteins, UV-inducible LHCSR1 and blue light-inducible LHCSR3, appear to be responsible for this function. While the LHCSR3 protein has been intensively studied, the role of LHCSR1 has been only partially elucidated. To investigate the molecular functions of LHCSR1 in C. reinhardtii, we performed biochemical and spectroscopic experiments and found that the protein mediates excitation energy transfer from light-harvesting complexes for Photosystem II (LHCII) to Photosystem I (PSI), rather than Photosystem II, at a low pH. This altered excitation transfer allows remarkable fluorescence quenching under high light. Our findings suggest that there is a PSI-dependent photoprotection mechanism that is facilitated by LHCSR1.

Sign in / Sign up

Export Citation Format

Share Document