Article
Plant Sciences
Nqobile Truelove Ndhlovu, Knut Asbjorn Solhaug, Farida Minibayeva, Richard Peter Beckett
Summary: Lichens have a problem of excess energy causing the formation of harmful reactive oxygen species. Fungi in the lichens can reduce reactive oxygen species formation by synthesizing melanins, while photobionts can dissipate excess energy through non-photochemical quenching. The use of fluorimetry techniques to measure non-photochemical quenching has limitations, but a dissection technique can accurately evaluate it. The level of non-photochemical quenching in melanised thalli may vary depending on the light history of the microhabitat and presence of other tolerance mechanisms.
Article
Cell Biology
Myriam Canonico, Grzegorz Konert, Aurelie Crepin, Barbora Sediva, Radek Kana
Summary: The study investigates photoprotective mechanisms of photosynthetic organisms under high-light stress, revealing a three-phase response to acute high-light stress at the single-cell level. Carotenoid accumulation during high-light stress may be involved in direct photoprotection and optimal distribution of photosystems in the thylakoid membrane.
Article
Biochemistry & Molecular Biology
Robert H. Calderon, Catherine de Vitry, Francis-Andre Wollman, Krishna K. Niyogi
Summary: This study found that rubredoxin 1 (RBD1) is not necessary for heme b559 assembly but may play a role in promoting the proper folding of D1 during PSII assembly.
JOURNAL OF BIOLOGICAL CHEMISTRY
(2023)
Article
Plant Sciences
Kunal Dhokne, Jayendra Pandey, Ranay Mohan Yadav, Pavithra Ramachandran, Jyoti Ranjan Rath, Rajagopal Subramanyam
Summary: Salt stress has adverse effects on the photosynthetic process and thylakoid structure in Pea. Under high salt conditions, the net photosynthetic rate decreases, water use efficiency improves, and the photochemical efficiency of both photosystems is reduced. Non-photochemical quenching is decreased, while non-regulated energy dissipation increases, leading to the inactivation of PSII. Salt stress also affects the electron transport chain, causing disorganization of thylakoid grana and altering the macro-organization and super complexes of thylakoids.
PLANT PHYSIOLOGY AND BIOCHEMISTRY
(2022)
Article
Plant Sciences
Taras K. Antal, Alena A. Volgusheva, Galina P. Kukarskikh, Evgeniy P. Lukashev, Alexander A. Bulychev, Andrea Margonelli, Silvia Orlanducci, Gabriella Leo, Luciana Cerri, Esa Tyystjarvi, Maya D. Lambreva
Summary: Research has found that single-walled carbon nanotubes (SWCNTs) can protect algal photosynthesis against photoinhibition, and intentional selection of nanomaterial characteristics can overcome their inherent phytotoxicity.
PLANT PHYSIOLOGY AND BIOCHEMISTRY
(2022)
Article
Environmental Sciences
Guo-Ning Nan, Xiao-Qun Zhou, Xiu-Mei Zhang, Quan-Sheng Zhang, Zi-Min Hu, Rui-Ping Huang, Di Zhang
Summary: This study demonstrates that xanthophyll cycle-induced non-photochemical quenching (NPQ) can effectively protect Sargassum thunbergii from light fluctuations in the intertidal zone.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Plant Sciences
Akihiro Saito, Kimika Hoshi, Yuna Wakabayashi, Takumi Togashi, Tomoki Shigematsu, Maya Katori, Takuji Ohyama, Kyoko Higuchi
Summary: The barley cultivar Sarab 1 can continue photosynthesis under low iron conditions through a reduction in P700 over-reduction and an increase in non-appressed thylakoid membranes. In contrast, another cultivar, Ehimehadaka-1, preferentially supplies iron to photosystem I to maintain photosynthetic activity. These findings highlight the multiple strategies that barley species have for acclimating photosynthesis to iron deficiency.
Article
Plant Sciences
Kouki Hikosaka
Summary: Photoinhibited leaves show a negative correlation between photosynthesis and chlorophyll fluorescence, contrasting with previous remote sensing studies. Vegetation photosynthesis estimated solely from chlorophyll fluorescence may be overestimated in the presence of severely photoinhibited leaves. A model of energy allocation can be useful for evaluating photosynthetic activities of photoinhibited leaves through remote sensing.
FUNCTIONAL PLANT BIOLOGY
(2021)
Article
Plant Sciences
Helena Sapeta, Makio Yokono, Atsushi Takabayashi, Yoshifumi Ueno, Andre M. Cordeiro, Toshihiko Hara, Ayumi Tanaka, Seiji Akimoto, M. Margarida Oliveira, Ryouichi Tanaka
Summary: Jatropha curcas responds to drought by increasing thermal dissipation of excitation energy in both photosystems, temporarily down-regulating the quantum yields of both PSII and PSI. This helps protect the photosynthetic machinery and enables rapid recovery of photosynthetic capacity when water is available.
JOURNAL OF EXPERIMENTAL BOTANY
(2023)
Article
Plant Sciences
Hui Min Olivia Oung, Roma Mukhopadhyay, Vaclav Svoboda, Dana Charuvi, Ziv Reich, Helmut Kirchhoff
Summary: The study found that in the dehydration process of the resurrection plant Craterostigma pumilum, older plants degrade specific subunits of the photosynthetic apparatus, while younger plants increase photoprotective mechanisms to maintain the ability to replace damaged subunits.
JOURNAL OF EXPERIMENTAL BOTANY
(2022)
Article
Plant Sciences
Callum Gray, Tiejun Wei, Tomas Polivka, Vangelis Daskalakis, Christopher D. P. Duffy
Summary: Higher plants have a defense mechanism called Non-Photochemical Quenching (NPQ) to protect themselves from intense light. This involves the participation of energy transfer and the S-1 state. Previous models of NPQ have limitations and this study aims to address them by parameterizing the vibronic structure and relaxation dynamics of lutein, as well as analyzing multiple minima. The results suggest that the previous quenching mechanism based on S-1 energy transfer is unlikely, and the real mechanism may involve short-range interaction and/or non-trivial inter-molecular states.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Aynura Pashayeva, Guangxi Wu, Irada Huseynova, Choon-Hwan Lee, Ismayil S. Zulfugarov
Summary: This study investigated the role of thylakoid protein phosphorylation in regulating energy-dependent quenching of chlorophyll fluorescence in rice plants. The results showed that phosphorylated proteins were enhanced in the PsbS-KO mutant after illumination, indicating a light-induced process. It was suggested that this enhancement might be due to increased reactive-oxygen-species production in this mutant.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Review
Plant Sciences
Alexander Ruban, Sam Wilson
Summary: Non-photochemical chlorophyll fluorescence quenching (NPQ) is a highly researched topic in photosynthesis, with a focus on the molecular mechanisms behind it. Recent studies have delved into the significance of NPQ in protecting RCII and monitoring qE component's lifespan, as well as the potential interplay between thylakoid membrane geometry, LHCII dynamics, PsbS protein, and thylakoid lipids in inducing a qE-related conformational change.
PLANT AND CELL PHYSIOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Sanna Gunell, Tapio Lempiainen, Eevi Rintamaki, Eva-Mari Aro, Mikko Tikkanen
Summary: Light-induced photosystem II photoinhibition causes inactivation and irreversible damage to the reaction center protein(s), but the light harvesting complexes continue to collect light energy. This study investigates the consequences of such photoinhibition on thylakoid light harvesting and electron transfer reactions in Arabidopsis thaliana leaves. The results show that without blocking the repair of damaged photosystem II centers, photoinhibition increases the excitation of photosystem II relative to photosystem I, while blocking repair leads to increased excitation of photosystem I and strong oxidation of the electron transfer chain. It is hypothesized that dynamic regulation of the LHCII system plays a crucial role in controlling excitation energy transfer during photosystem II damage and repair to maintain efficient and safe photosynthesis.
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
(2023)
Article
Chemistry, Physical
Franco V. A. Camargo, Federico Perozeni, Gabriel de la Cruz Valbuena, Luca Zuliani, Samim Sardar, Giulio Cerullo, Cosimo D'Andrea, Matteo Ballottari
Summary: LHCSR3 proteins in green algae play crucial roles in photoprotection through non-photochemical quenching, involving pH sensing and dissipation of chlorophylls excited-state energy. The C-terminal residues of LHCSR3 have been shown to be involved in a complex mechanism of NPQ, with multiple contributions triggered by different acidic residues.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Plant Sciences
Hirokazu Tanaka, Tomasz Nodzynski, Saeko Kitakura, Mugurel I. Feraru, Michiko Sasabe, Tomomi Ishikawa, Juergen Kleine-Vehn, Tatsuo Kakimoto, Jiri Friml
PLANT AND CELL PHYSIOLOGY
(2014)
Article
Plant Sciences
Yasusi Yamamoto, Suguru Kai, Atsuki Ohnishi, Nodoka Tsumura, Tomomi Ishikawa, Haruka Hori, Noriko Morita, Yasuo Ishikawa
PLANT AND CELL PHYSIOLOGY
(2014)
Article
Multidisciplinary Sciences
Tiffanie Chan, Yurika Shimizu, Pavel Pospisil, Nobuyoshi Nijo, Anna Fujiwara, Yoshito Taninaka, Tomomi Ishikawa, Haruka Hori, Daisuke Nanba, Aya Imai, Noriko Morita, Miho Yoshioka-Nishimura, Yohei Izumi, Yoko Yamamoto, Hideki Kobayashi, Naoki Mizusawa, Hajime Wada, Yasusi Yamamoto