Results 141 to 150 of about 875 (171)

PGR5 Is Involved in Cyclic Electron Flow around Photosystem I and Is Essential for Photoprotection in Arabidopsis [PDF]

Cell, 2002
During photosynthesis, plants must control the utilization of light energy in order to avoid photoinhibition. We isolated an Arabidopsis mutant, pgr5 (proton gradient regulation), in which downregulation of photosystem II photochemistry in response to ...
Yuri Munekage, Jörg Meurer, Tsuyoshi Endo   +2 more
exaly   +4 more sources

Photoautotrophic and sustained H2 production by the pgr5 mutant of Chlamydomonas reinhardtii in simulated daily light conditions

International Journal of Hydrogen Energy
Green algae, such as Chlamydomonas reinhardtii, can produce H2 efficiently using their hydrogenases, but these enzymes are O2-sensitive and compete with CO2-fixation for electrons.
Valeria Nagy, Soujanya Kuntam, László Kovacs   +2 more
exaly   +3 more sources

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An ancient function of PGR5 in iron delivery?

Trends in Plant Science, 2022
In all phototrophic organisms, the photosynthetic apparatus must be protected from light-induced damage. One important mechanism that mitigates photodamage in plants is antimycin A (AA)-sensitive cyclic electron flow (CEF), the evolution of which remains largely obscure.
Dario Leister, Giada Marino, Jun Minagawa   +2 more
exaly   +3 more sources

Effect of PGR5 Impairment on Photosynthesis and Growth in Arabidopsis thaliana [PDF]

Plant and Cell Physiology, 2008
PGR5 has been reported as an important factor for the activity of the ferredoxin-dependent cyclic electron transport around PSI. To elucidate the role of PGR5 in C(3) photosynthesis, we characterized the photosynthetic electron transport rate (ETR), CO(2) assimilation and growth in the Arabidopsis thaliana pgr5 mutant at various irradiances and with CO(
Bernard Genty, Gilles Peltier, Peltier Gilles   +2 more
exaly   +3 more sources

Metabolomic response to high light from pgrl1 and pgr5 mutants of Chlamydomonas reinhardtii

Photochemical & Photobiological Sciences, 2023
Chlamydomonas (C.) reinhardtii metabolomic changes in cyclic electron flow-dependent mutants are still unknown. Here, we used mass spectrometric analysis to monitor the changes in metabolite levels in wild-type, cyclic electron-deficient mutants pgrl1 and pgr5 grown under high-light stress.
Nisha Chouhan, Sureshbabu Marriboina, Aprajita Kumari, Pooja Singh, Ranay Mohan Yadav, Kapuganti Jagadis Gupta, Rajagopal Subramanyam   +6 more
openaire   +2 more sources

PGR5 is required to avoid photosynthetic oscillations during light transitions

2023
Abstract The production of ATP and NADPH by the light reactions of photosynthesis and their consumption by the Calvin-Benson-Bassham (CBB) cycle and other downstream metabolic reactions requires careful regulation. Environmental shifts perturb this careful balance, leading to photo-oxidative stress and losses in CO
Gustaf E. Degen, Federica Pastorelli, Matthew P. Johnson   +2 more
openaire   +1 more source

Significance of PGR5-dependent cyclic electron flow for optimizing the rate of ATP synthesis and consumption in Arabidopsis chloroplasts

Photosynthesis Research, 2018
The proton motive force (PMF) across the chloroplast thylakoid membrane that is generated by electron transport during photosynthesis is the driving force for ATP synthesis in plants. The PMF mainly arises from the oxidation of water in photosystem II and from electron transfer within the cytochrome b6f complex. There are two electron transfer pathways
Mai Duy Luu Trinh, Takeharu Nagai, Shinji Masuda   +2 more
exaly   +5 more sources

PGR5-LIKE PHOTOSYNTHETIC PHENOTYPE1A redox states alleviate photoinhibition during changes in light intensity

Plant Physiology, 2023
Abstract Plants have evolved photosynthetic regulatory mechanisms to maintain homeostasis in response to light changes during diurnal transitions and those caused by passing clouds or by wind. One such adaptation directs photosynthetic electron flow to a cyclic pathway to alleviate excess energy surges.
Amit Kumar Chaturvedi, Orly Dym, Yishai Levin, Robert Fluhr   +3 more
openaire   +2 more sources

A pgr5 suppressor screen uncovers a distinct mechanism safeguarding the cytochrome b ₆ f complex from damage through PGR5

2023
ABSTRACT PROTON GRADIENT REGULATION5 (PGR5) is thought to promote cyclic electron flow (CEF) and its deficiency causes increased photosensitivity of photosystem I (PSI), leading to lethality under fluctuating light (FL). By screening for suppressor mutations that rescue FL lethality of pgr5
Jan-Ferdinand Penzler, Belen Naranjo, Sabrina Walz, Giada Marino, Tatjana Kleine, Dario Leister   +5 more
openaire   +1 more source

Investigating the role of PGR5 and PGRL1 in photosynthetic acclimation to salt stress in Chlamydomonas reinhardtii

Photosynthesis Research
In this study, we aimed to understand the role of cyclic electron transport (CET) in the acclimation process in response to high salinity stress by comparing wild-type Chlamydomonas reinhardtii with CET deficient mutants, Proton Gradient Regulation 5 (PGR5), and Proton Gradient Regulation Like 1 (PGRL1). Cells grown in photoautotrophic conditions under
Siva Naga Sai Damaraju, Ranay Mohan Yadav, Namrata Dubey, Pavithra Ramachandran, Jyoti Ranjan Rath, Jerome Xavier Gunasekaran, Shriya Sharma, Rajagopal Subramanyam   +7 more
openaire   +2 more sources