Results 11 to 20 of about 1,487 (149)

Intrinsic Fluctuations in Transpiration Induce Photorespiration to Oxidize P700 in Photosystem I [PDF]

Plants, 2020
Upon exposure to environmental stress, the primary electron donor in photosystem I (PSI), P700, is oxidized to suppress the production of reactive oxygen species that could oxidatively inactivate the function of PSI.
Riu Furutani, Amane Makino, Yuij Suzuki, Shinya Wada, Ginga Shimakawa, Chikahiro Miyake   +5 more
doaj   +3 more sources

Moderate photoinhibition of PSII and oxidation of P700 contribute to chilling tolerance of tropical tree species in subtropics of China

Photosynthetica, 2023
In the subtropics, a few tropical tree species are distributed and planted for ornamental and horticultural purposes; however, the photosynthesis of these species can be impaired by chilling.
V.S.J. SUNOJ, Y. WEN, A. JAJOO, A.W. SHORT, W.H. ZENG, N.I. ELSHEERY, K.F. CAO   +6 more
doaj   +3 more sources

Higher Reduced State of Fe/S-Signals, with the Suppressed Oxidation of P700, Causes PSI Inactivation in Arabidopsis thaliana

Antioxidants, 2022
Environmental stress increases the risk of electron accumulation in photosystem I (PSI) of chloroplasts, which can cause oxygen (O2) reduction to superoxide radicals and decreased photosynthetic ability.
Riu Furutani, Shinya Wada, Kentaro Ifuku, Shu Maekawa, Chikahiro Miyake   +4 more
doaj   +3 more sources

Photorespiration Enhances Acidification of the Thylakoid Lumen, Reduces the Plastoquinone Pool, and Contributes to the Oxidation of P700 at a Lower Partial Pressure of CO₂ in Wheat Leaves [PDF]

Plants, 2020
The oxidation of P700 in photosystem I (PSI) is a robust mechanism that suppresses the production of reactive oxygen species. We researched the contribution of photorespiration to the oxidation of P700 in wheat leaves.
Shinya Wada, Yuji Suzuki, Chikahiro Miyake   +2 more
doaj   +2 more sources

Loss of qE Does Not Necessarily Lead to Photoinhibition: Sustained Non-Photochemical Quenching in the Absence of PsbS and Zeaxanthin. [PDF]

Plant Cell Environ
ABSTRACT Photosynthetic light‐harvesting complexes mediate light absorption and energy dissipation. By modulating the photosystems' absorption cross‐section, they affect both photosynthetic activity and non‐photochemical quenching (NPQ). These processes are often studied by spectrally integrated chlorophyll fluorescence, masking their associated ...
Cainzos M, Hu C, Pissolato MD, Fataftah N, Nanda S, Jansson S.   +5 more
europepmc   +2 more sources

Depletion reveals role of bicarbonate in the photosynthetic electron transport chain of Limnospira maxima [PDF]

Frontiers in Plant Science
Efficient photosynthetic light reactions require tight balancing of electrons and protons. In photosystem II, bicarbonate is coordinated to a non-heme iron positioned between the acceptor-side plastoquinones QA and QB, modulating electron transfer.
Leslie Castillo, Stavroula Nicolaou, Colin Gates, Colin Gates   +3 more
doaj   +2 more sources

Physiological Roles of Flavodiiron Proteins and Photorespiration in the Liverwort Marchantia polymorpha

Frontiers in Plant Science, 2021
Against the potential risk in oxygenic photosynthesis, that is, the generation of reactive oxygen species, photosynthetic electron transport needs to be regulated in response to environmental fluctuations. One of the most important regulations is keeping
Ginga Shimakawa, Ginga Shimakawa, Ginga Shimakawa, Ginga Shimakawa, Hitomi Hanawa, Shinya Wada, Shinya Wada, Guy T. Hanke, Yusuke Matsuda, Chikahiro Miyake, Chikahiro Miyake   +10 more
doaj   +1 more source

Identification of a Novel Mutation Exacerbated the PSI Photoinhibition in pgr5/pgrl1 Mutants; Caution for Overestimation of the Phenotypes in Arabidopsis pgr5-1 Mutant

Cells, 2021
PSI photoinhibition is usually avoided through P700 oxidation. Without this protective mechanism, excess light represents a potentially lethal threat to plants.
Shinya Wada, Katsumi Amako, Chikahiro Miyake   +2 more
doaj   +1 more source

Oxidation of P700 in Photosystem I Is Essential for the Growth of Cyanobacteria [PDF]

Plant Physiology, 2016
The photoinhibition of photosystem I (PSI) is lethal to oxygenic phototrophs. Nevertheless, it is unclear how photodamage occurs or how oxygenic phototrophs prevent it. Here, we provide evidence that keeping P700 (the reaction center chlorophyll in PSI) oxidized protects PSI.
Ginga Shimakawa, Keiichiro Shaku, Chikahiro Miyake   +2 more
openaire   +2 more sources

Different Strategies for Photosynthetic Regulation under Fluctuating Light in Two Sympatric Paphiopedilum Species

Cells, 2021
Fluctuating light can cause selective photoinhibition of photosystem I (PSI) in angiosperms. Cyclic electron flow (CEF) around PSI and electron flux from water via the electron transport chain to oxygen (the water-water cycle) play important roles in ...
Jing-Qiu Feng, Wei Huang, Ji-Hua Wang, Shi-Bao Zhang   +3 more
doaj   +1 more source