Article
Biology
Koji Kato, Tasuku Hamaguchi, Ryo Nagao, Keisuke Kawakami, Yoshifumi Ueno, Takehiro Suzuki, Hiroko Uchida, Akio Murakami, Yoshiki Nakajima, Makio Yokono, Seiji Akimoto, Naoshi Dohmae, Koji Yonekura, Jian-Ren Shen
Summary: By analyzing the structure of a PSI trimer from the ancient cyanobacterium Gloeobacter violaceus PCC 7421, we discovered two low-energy chlorophylls that are missing in this organism, shedding light on the evolutionary changes of low-energy chlorophylls in oxygenic photosynthetic organisms.
Article
Plant Sciences
Ryutaro Tokutsu, Konomi Fujimura-Kamada, Tomohito Yamasaki, Keisuke Okajima, Jun Minagawa
Summary: Photosynthesis in chloroplasts is crucial for photoautotrophic growth, while non-photochemical quenching (NPQ) helps prevent the generation of reactive oxygen species under excess light. In the green alga Chlamydomonas reinhardtii, UV light activates NPQ-dependent photoprotection more rapidly than visible light, leading to faster gene expression and protein accumulation related to photoprotection. The action spectrum of UV-dependent induction of photoprotective factors suggests that C. reinhardtii senses longer-wavelength UV compared to the dicot plant Arabidopsis, indicating a unique UV response in green algae.
Article
Plant Sciences
Sam Wilson, Matthew P. Johnson, Alexander Ruban
Summary: The proton motive force (pmf) across the thylakoid membrane plays a crucial role in coupling photosynthetic electron transport and ATP synthesis. The use of electrochromic carotenoid and chlorophyll absorption band shift (ECS) to measure pmf in leaves has become widespread, but the interpretation of the results remains controversial. This study demonstrated that the majority of the pmf attributed to Delta psi by the ECS parsing method is actually caused by the overlap of Delta A505 and Delta A535, confirming that pmf is mainly composed of Delta pH following continuous illumination.
Article
Plant Sciences
Yuji Suzuki, Kaho Ohsaki, Yuki Takahashi, Shinya Wada, Chikahiro Miyake, Amane Makino
Summary: The behavior of photosystems II and I in rice leaves is modulated by changes in nitrogen partitioning, leading to alterations in how excess light energy is utilized. This study explores the changes in biochemical parameters of photosynthesis and their correlation with PSII and PSI parameters in mature and senescent leaves of rice under nitrogen deficiency.
PLANT AND CELL PHYSIOLOGY
(2023)
Article
Multidisciplinary Sciences
Maithili Krishnan-Schmieden, Patrick E. Konold, John T. M. Kennis, Anjali Pandit
Summary: Research reveals that Photosystem II subunit S (PsbS) senses thylakoid lumen acidification when plants are exposed to excess light. The study utilizes NMR and IR spectroscopy to demonstrate that low pH causes repositioning of an amphipathic helix and folding of a loop involving critical pH sensing glutamate residues in PsbS.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Alexander Ruban, Francesco Saccon
Summary: Photosystem II (PSII) uses light energy to split water and sustain heterotrophic life on Earth. The main light harvesting complex in plants, LHCII, supplies excitation energy to PSII. However, stress can damage PSII and hinder photosynthesis. In response, LHCII has a flexible design to switch between energy harvesting and dissipation, safely releasing excess energy.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Biochemistry & Molecular Biology
Nathan G. Brady, Cameron E. Workman, Bridgie Cawthon, Barry D. Bruce, Brian K. Long
Summary: This study demonstrates that functionalizing SMAs can enhance the efficiency of extracting PSI from cyanobacterial membranes, with the number and length of side chains playing a crucial role in the extraction mechanism of PSI.
Article
Environmental Sciences
Shuzhi Wang, Rehemanjiang Wufuer, Jia Duo, Wenfeng Li, Xiangliang Pan
Summary: Heavy metals like Cd pose environmental problems and threats to various organisms. This study investigated the effects of Cd on the growth and activities of PSI and PSII in Chlorella pyrenoidosa. The results showed that Cd had a more severe inhibition on PSII than on PSI. Cd decreased the efficiency of PSII's energy utilization under high light. However, the quantum yield of PSI did not show significant differences among different Cd treatments. Activation of CEF played a crucial role in the induction of NPQ. The binding features of Cd ions and photosystem particles suggested that Cd had a stronger affinity for PSII than for PSI.
Article
Biochemistry & Molecular Biology
Sam Wilson, Eunchul Kim, Asako Ishii, Alexander Ruban, Jun Minagawa
Summary: The overexpression of photoprotective proteins in the det1-2 phot mutant of green algae enhances the nonphotochemical quenching (NPQ) response, allowing the mutant to grow and survive under high light intensities that are lethal for wild-type cells. This mutant exhibits a smaller PSII cross-section and a detachment of LHCII antenna in the NPQ state. The study reveals the mechanism by which the overexpression of photoprotective proteins enables an efficient and effective photoprotective response in the det1-2 phot mutant.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
(2023)
Article
Plant Sciences
Ravindra S. Kale, Jacob L. Seep, Larry Sallans, Laurie K. Frankel, Terry M. Bricker
Summary: Under aerobic conditions, both photosystems and cytochrome complexes in photosynthetic organisms generate Reactive Oxygen Species (ROS). This study identifies the distribution of oxidatively modified amino acid residues in chlorophyll light-harvesting complexes and highlights differences between complexes from different sources.
PHOTOSYNTHESIS RESEARCH
(2022)
Article
Chemistry, Physical
Sam Wilson, Dan-Hong Li, Alexander Ruban
Summary: The study reveals pseudothylakoid characteristics in artificial LHCII membranes, mimicking natural plant membranes. High densities of LHCII cause liposome stacking and the appearance of an unexpected emission peak similar to photosystem I emission. These findings have significant implications for interpreting the spectroscopic and physiological properties of photosynthetic membranes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Plant Sciences
Dandan Wei, Tianpeng Zhang, Bingquan Wang, Huiling Zhang, Mingyang Ma, Shufen Li, Tony H. H. Chen, Marian Brestic, Yang Liu, Xinghong Yang
Summary: The study demonstrated that glycinebetaine (GB) can enhance chilling tolerance in tomato plants by protecting chloroplast ultrastructure, mitigating PSII photoinhibition, and maintaining PSII stability under chilling stress. GB also increased electron transfer rate and cyclic electron flow, reduced reactive oxygen species production, and alleviated PSI photodamage. Introduction of the GB biosynthetic pathway and exogenous GB application are effective strategies for improving chilling tolerance in tomato plants.
PLANT CELL REPORTS
(2022)
Article
Multidisciplinary Sciences
Shiun-Jr Yang, Eric A. Arsenault, Kaydren Orcutt, Masakazu Iwai, Yusuke Yoneda, Graham R. Fleming
Summary: This study used 2DEV spectroscopy to analyze the spinach PSII-CC, revealing details about its dynamics and energy transfer. The study found that the dominant dynamics of the PSII-CC vary in different excitation energy regions. By separating these regions and identifying the roles of key pigments, a better understanding of the working mechanism of photosystem II can be obtained.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Biochemistry & Molecular Biology
Makio Yokono, Chiyo Noda, Jun Minagawa
Summary: This paper investigates the energy transfer between Photosystem II and Photosystem I in Arabidopsis thaliana, and finds that the fast spillover is reversibly regulated depending on pH.
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
(2024)
Article
Plant Sciences
Yuki Takahashi, Shinya Wada, Ko Noguchi, Chikahiro Miyake, Amane Makino, Yuji Suzuki
Summary: The study found that the photochemistry of PSII and PSI is primarily regulated by the amount of total leaf-N, with a strong correlation between the changes in PSII and PSI parameters, indicating a coordinated regulation. Additionally, in low N-acclimated plants, excess light energy was found to stimulate the oxidation of the reaction center chlorophyll of PSI to protect it, and the relationship between Y(II) and Y(ND) was similar to that observed in osmotically stressed rice plants.
PLANT AND CELL PHYSIOLOGY
(2021)
Article
Plant Sciences
Guido Durian, Verena Jeschke, Moona Rahikainen, Katariina Vuorinen, Peter J. Gollan, Mikael Brosche, Jarkko Salojarvi, Erich Glawischnig, Zsofia Winter, Shengchun Li, Graham Noctor, Eva-Mari Aro, Jaakko Kangasjarvi, Kirk Overmyer, Meike Burow, Saijaliisa Kangasjarvi
Article
Biochemistry & Molecular Biology
Sanna Rantala, Tapio Lempiainen, Caterina Gerotto, Arjun Tiwari, Eva-Mari Aro, Mikko Tikkanen
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
(2020)
Article
Plant Sciences
Luca Tadini, Carlotta Peracchio, Andrea Trotta, Monica Colombo, Ilaria Mancini, Nicolaj Jeran, Alex Costa, Franco Faoro, Milena Marsoni, Candida Vannini, Eva-Mari Aro, Paolo Pesaresi
Article
Plant Sciences
Yufen Che, Shoko Kusama, Shintaro Matsui, Marjaana Suorsa, Takeshi Nakano, Eva-Mari Aro, Kentaro Ifuku
PLANT AND CELL PHYSIOLOGY
(2020)
Article
Plant Sciences
Michele Grieco, Valentin Roustan, Georgi Dermendjiev, Sanna Rantala, Arpit Jain, Manuela Leonardelli, Kerstin Neumann, Vitus Berger, Doris Engelmeier, Gert Bachmann, Ingo Ebersberger, Eva-Mari Aro, Wolfram Weckwerth, Markus Teige
PLANT CELL AND ENVIRONMENT
(2020)
Article
Plant Sciences
Claudio Calvaruso, Anne Rokka, Eva-Mari Aro, Claudia Buechel
Article
Multidisciplinary Sciences
Roberto Barbato, Luca Tadini, Romina Cannata, Carlotta Peracchio, Nicolaj Jeran, Alessandro Alboresi, Tomas Morosinotto, Azfar Ali Bajwa, Virpi Paakkarinen, Marjaana Suorsa, Eva-Mari Aro, Paolo Pesaresi
SCIENTIFIC REPORTS
(2020)
Article
Plant Sciences
Duncan Fitzpatrick, Eva-Mari Aro, Arjun Tiwari
FRONTIERS IN PLANT SCIENCE
(2020)
Article
Multidisciplinary Sciences
Steffen Grebe, Andrea Trotta, Azfar Ali Bajwa, Ilaria Mancini, Pushan Bag, Stefan Jansson, Mikko Tikkanen, Eva-Mari Aro
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Plant Sciences
Juan de Dios Barajas-Lopez, Arjun Tiwari, Xavier Zarza, Molly W. Shaw, Jesus Pascual, Matleena Punkkinen, Joanna C. Bakowska, Teun Munnik, Hiroaki Fujii
Summary: ERD7 and its homologs play crucial roles in plant stress responses and development, with a connection to the modification in membrane lipid composition.
PLANT AND CELL PHYSIOLOGY
(2021)
Article
Plant Sciences
Duncan Fitzpatrick, Eva-Mari Aro, Arjun Tiwari
Summary: Oxygen reduction occurs at various components of the photosynthetic electron transfer chain (PETC), but only electron flow to photosystem I (PSI) leads to H2O2 accumulation. H2O2 from PETC may increase mitochondrial respiration and CO2 release. H2O2 production in PETC locations other than PSI is quickly quenched and cannot participate in H2O2 translocation and signaling.
Article
Plant Sciences
Tapio Lempiainen, Eevi Rintamaki, Eva-Mari Aro, Mikko Tikkanen
Summary: Photosynthetic light reactions require strict regulation under dynamic environmental conditions. Depending on environmental constraints, photoinhibition of either Photosystem II (PSII) or Photosystem I (PSI) occurs frequently. Repair of photodamaged PSI is very slow compared to that of PSII, leading to a functional imbalance between the two photosystems. In this study, we investigated the acclimation of photosynthesis to PSI-limited conditions, both in the short-term and long-term, after PSI-specific photoinhibition treatment. We found that short-term acclimation mechanisms were induced immediately after inhibition, while longer-term acclimation involved changes in the stromal redox system and increased abundance of ATP synthase and Cytochrome b6f. Acclimation to PSI-limited conditions restored the CO2 assimilation capacity of plants without major PSI repair. These findings demonstrate that plants efficiently acclimate to changes in the photosynthetic apparatus, which is crucial for their adaptation to adverse environmental conditions.
PLANT CELL AND ENVIRONMENT
(2022)
Article
Biochemistry & Molecular Biology
Marjaana Rantala, Sanna Rantala, Eva-Mari Aro
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
(2020)
