Article
Plant Sciences
Marguerite Cinq-Mars, Guy Samson
Summary: This study revealed that the decline in CO2 assimilation at frequencies of 10 Hz and lower was associated with the formation of nonphotochemical quenching (NPQ) and a restriction of electron flows toward PSI. The results suggest that under these conditions, there is a favoring of accumulation of harmless P-700(+) at the expense of decreased quantum yield of photochemistry for PSII.
Article
Biology
Yuval Milrad, Valeria Nagy, Tamar Elman, Maria Fadeeva, Szilvia Z. Toth, Iftach Yacoby
Summary: A slow-down switch in photosystem II (PSII) has been found to limit H-2 generation from Chlamydomonas reinhardtii under anoxia, reducing photosynthetic productivity by three-fold. This activation occurs within 10 seconds of illumination and can be reversed after 15 minutes of dark anoxia. Understanding the mechanism of this switch provides insights into anoxic photosynthesis and offers potential strategies to improve bio-energy production.
COMMUNICATIONS BIOLOGY
(2023)
Article
Plant Sciences
Amit Kumar Chaturvedi, Orly Dym, Yishai Levin, Robert Fluhr
Summary: This study reveals the crucial role of redox state changes in PGRL1A in optimizing photosynthesis and highlights their importance in regulating plant growth under varying light conditions.
Article
Plant Sciences
Ying-Jie Yang, Qi Shi, Hu Sun, Ren-Qiang Mei, Wei Huang
Summary: This study demonstrated that different ontogenetic stages of leaves in epiphytic orchid Dendrobium officinale utilize different photoprotective mechanisms to deal with fluctuating light. Mature leaves use water-water cycle (WWC) to prevent over-reduction of PSI, while young leaves enhance cyclic electron flow (CEF) around PSI to compensate for the lack of WWC, thus avoiding uncontrolled PSI over-reduction induced by fluctuating light.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Plant Sciences
Qi Chen, Yixin Lan, Qinghua Li, Mengmeng Kong, Hualing Mi
Summary: Plants have multiple mechanisms, including photosynthetic cyclic electron transports and photorespiration, to maintain efficient photosynthesis. This study reveals the functional link between these two mechanisms and shows that photorespiration can compensate for the loss of photosynthetic cyclic electron transport functions, thus playing a crucial role in maintaining efficient photosynthesis.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Cell Biology
Jing-Qiu Feng, Wei Huang, Ji-Hua Wang, Shi-Bao Zhang
Summary: Two orchid species, P. dianthum and P. micranthum, employ different strategies to cope with fluctuating light, with P. dianthum relying on the water-water cycle and P. micranthum compensating with enhanced CEF. This diversity in photosynthetic acclimation strategies highlights the complexity of plant responses to changing light conditions within closely related species.
Article
Biochemistry & Molecular Biology
Miho Ohnishi, Shu Maekawa, Shinya Wada, Kentaro Ifuku, Chikahiro Miyake
Summary: In this study, the activity of ferredoxin (Fd)-dependent cyclic electron flow (Fd-CEF) around photosystem I (PSI) in intact leaves of Arabidopsis thaliana was investigated. The oxidation rate of Fd reduced by PSI (vFd) and photosynthetic linear electron flow activity were measured simultaneously under actinic light illumination. The results showed that vFd exhibited a curved response to the photosynthetic linear electron flow activity, with a linear relationship at lower flow activity and a sharp increase at higher flow activity, indicating the presence of excess vFd resulting from electron flow over photosynthetic linear electron flow. Furthermore, the excess vFd was also observed in NAD(P)H dehydrogenase-deficient mutants.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Plant Sciences
Jayendra Pandey, Elsinraju Devadasu, Deepak Saini, Kunal Dhokne, Sureshbabu Marriboina, Agepati. S. S. Raghavendra, Rajagopal Subramanyam
Summary: This study found that the effects of drought on photosynthesis have been extensively studied, but the effects on thylakoid organization are limited. The research observed a significant decline in gas exchange parameters and a reduction of photochemical efficiency of photosystem II and I in pea leaves under progressive drought stress. Furthermore, the study found changes in the organization of light-harvesting complexes and reductions in supercomplexes of thylakoids in drought-affected plants.
Article
Plant Sciences
Jan-Ferdinand Penzler, Giada Marino, Bennet Reiter, Tatjana Kleine, Belen Naranjo, Dario Leister
Summary: The PGR5 protein interacts with PGRL1 and PGRL2, and the mutation in PGR5(G130S) leads to photosynthetic defects. PGR5 is required alongside PGRL1 to avoid harmful effects on plant performance.
Article
Plant Sciences
Marine Messant, Umama Hani, Thais Hennebelle, Florence Guerard, Bertrand Gakiere, Andrew Gall, Sebastien Thomine, Anja Krieger-Liszkay
Summary: This study investigates the effects of excess and deficiency of manganese on chloroplast ultrastructure and photosynthetic electron transport in the liverwort Marchantia polymorpha, an emerging model system.
Article
Environmental Sciences
Kirill Azarin, Alexander Usatov, Tatiana Minkina, Nadezhda Duplii, Alexandra Kasyanova, Aleksei Fedorenko, Vladimir Khachumov, Saglara Mandzhieva, Vishnu D. Rajput
Summary: The functioning of photosynthesis in barley was studied after exposure to different concentrations of bulk and nanosized ZnO. The results showed that chlorophyll content, photosynthetic efficiency, and zinc accumulation in chloroplasts were affected, with more pronounced changes observed with nanosized ZnO exposure. Gene expression analysis revealed different sensitivities to the two types of ZnO exposure. The study highlights the importance of understanding the impact of nanoparticles on crop photosynthesis for food security.
ENVIRONMENTAL RESEARCH
(2023)
Review
Biochemistry & Molecular Biology
Shumeng Zhang, Baohua Zou, Peng Cao, Xiaodong Su, Fen Xie, Xiaowei Pan, Mei Li
Summary: Photosynthesis converts solar energy into chemical energy through the utilization of light energy, driving biochemical chains of electron transfers. Structural biology provides insights into the interaction patterns of membrane complexes, soluble electron carrier proteins, and their transient complexes, allowing visualization of different parts of the electron transfer process.
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
Plant Sciences
Qi Shi, Hu Sun, Stefan Timm, Shibao Zhang, Wei Huang
Summary: Plants grown under high light conditions have better photosynthetic performance and photorespiration capacity when facing fluctuating light. Photorespiration plays a protective role for photosystem I when there is a sudden increase in illumination.
Review
Chemistry, Multidisciplinary
Chen Wang, Michael P. O'Hagan, Bilha Willner, Itamar Willner
Summary: This article presents recent advances in developing artificial photosynthetic systems, including photobioelectrochemical cells interfacing with electrodes, light-induced electron transfer, and integration of artificial photosynthetic modules into dynamic nucleic acid networks.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Biochemistry & Molecular Biology
Anna Pecherina, Marina Grinberg, Maria Ageyeva, Daria Zanegina, Elena Akinchits, Anna Brilkina, Vladimir Vodeneev
Summary: Salinity is a common factor that limits crop productivity. The negative effects of salt stress on plant processes are caused by osmotic stress and toxic ions. The study investigated how salinity affects photosynthesis, transpiration, water content, and cytosolic pH in tobacco and potato plants. Salinity decreased photosynthesis activity and led to a decrease in water content and transpiration. The cytosolic pH also decreased in tobacco and potato plants. The study analyzed potential mechanisms of the effects of salinity on photosynthesis.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Plant Sciences
Lyubov Yudina, Ekaterina Sukhova, Ekaterina Gromova, Maxim Mudrilov, Yuriy Zolin, Alyona Popova, Vladimir Nerush, Anna Pecherina, Andrey A. A. Grishin, Artem A. A. Dorokhov, Vladimir Sukhov
Summary: Parameters of illumination, including spectra, intensity, and photoperiod, have a significant impact on plant cultivation under greenhouse conditions, especially for vegetables like lettuce. This study investigated the influence of photoperiod on lettuce production and photosynthesis parameters. The results showed that increasing the duration of illumination can stimulate dry weight accumulation, which can be achieved by either increasing light period or decreasing light intensity.
Article
Plant Sciences
Marina Grinberg, Yuliya Nemtsova, Maria Ageyeva, Anna Brilkina, Vladimir Vodeneev
Summary: This study investigated the mechanisms of systemic functional responses induced by electrical signals. It was found that chronic beta-irradiation had a positive effect on the morphometric parameters and photosynthetic activity of tobacco plants. Irradiation enhanced the plant's response to electrical signals, resulting in temporary changes in chlorophyll fluorescence parameters and increased amplitude and leaf coverage. Irradiation also enhanced signal-induced cytoplasmic acidification and showed stronger inhibition of stomatal conductance in the plants. The study concluded that the effect of irradiation on the systemic response induced by electrical signals mainly occurs during the transformation stage.
PHOTOSYNTHESIS RESEARCH
(2023)
Article
Plant Sciences
N. S. Mshenskaya, M. A. Grinberg, E. A. Kalyasova, V. A. Vodeneev, N. V. Ilin, N. N. Slyunyaev, E. A. Mareev, Y. V. Sinitsyna
Summary: Magnetic fields with a frequency of 14.3 Hz were found to have a protective effect on wheat plants under drought conditions, delaying harmful changes in transpiration and photosynthesis processes for several days.
Article
Biochemistry & Molecular Biology
Ekaterina Sukhova, Vladimir Sukhov
Summary: Electrical signals in plants are generated in response to various stressors and can greatly affect different physiological processes. These signals play a crucial role in integrating plant responses to stress, but they may also cause temporary separation between cells or plant parts. This separation can have adaptive benefits by storing energy compounds, limiting damage propagation, and potentially triggering programmed cell death.
Review
Chemistry, Physical
Dmitry A. Serov, Venera V. Khabatova, Vladimir Vodeneev, Ruibin Li, Sergey V. Gudkov
Summary: The resistance of microorganisms to antimicrobial drugs is a global issue, and significant efforts are being made to find antimicrobial components, approaches, and therapies. Selenium nanoparticles have high potential for antimicrobial activity, as evidenced by the increasing number of publications in the past decade. This review provides up-to-date information on the antimicrobial properties of selenium nanoparticles, including susceptible microorganisms, mechanisms of action on bacteria, and the impact of nanoparticle properties on antimicrobial activity. It comprehensively describes the antiviral, antibacterial, and antifungal effects of selenium nanoparticles.
Article
Environmental Sciences
Ekaterina Sukhova, Yuriy Zolin, Alyona Popova, Lyubov Yudina, Vladimir Sukhov
Summary: Salinization is a significant factor that limits agricultural plant productivity. Multispectral imaging and the photochemical reflectance index (PRI) can be used to detect early changes in plants under salinization. In this study, we investigated the sensitivity of modified PRIs to changes in pea plants under salinization treatment. The results showed that long-wavelength PRIs decreased, while short-wavelength PRIs increased under salinization. Long-wavelength PRIs were found to be more sensitive to plant changes and could potentially be used as a universal tool for early detection of stress in plants.
Article
Plant Sciences
Daria Ratnitsyna, Lyubov Yudina, Ekaterina Sukhova, Vladimir Sukhov
Summary: Photodamage is a key mechanism of photosynthetic disruption in plants under stress. Investigating photodamage is important for both basic and applied research. However, the complex mechanisms of photodamage make it difficult to use experimental methods, so developing mathematical models and conducting model-based analysis can overcome these limitations. In this study, a modified Farquhar-von Caemmerer-Berry model was developed to describe photodamage of photosynthetic electron transport in C-3 plants, using experimental results from pea plants. The model analysis showed that inactivation of linear electron flow and Rubisco can both increase and decrease photodamage. Simulation of photodamage under different temperatures and light intensities revealed multi-phase temperature dependences, with paradoxical increases in thermal tolerance observed under high temperatures. It was also found that changes in temperature optimums of linear electron flow and Rubisco can modify temperature dependences of photosynthetic electron transport under photodamage induction, mainly stimulating its photodamage.
Article
Plant Sciences
Lyubov Yudina, Alyona Popova, Yuriy Zolin, Ekaterina Sukhova, Vladimir Sukhov
Summary: By studying the effects of increased pressure, it was found that pressure can induce electrical signals and inhibit photosynthesis in plants.
Article
Plant Sciences
Maria N. Ageyeva, Tatiana A. Zdobnova, Mariia S. Nazarova, Galina N. Raldugina, Denis V. Beliaev, Vladimir A. Vodeneev, Anna A. Brilkina
Summary: Salinity has a significant impact on important processes in plants and decreases their yield. This study revealed that lower concentrations of NaCl result in cytosolic acidification in plant cells, while higher concentrations can cause an increase or return to normal levels of cytosolic pH. Additionally, salinity inhibits plant development and affects morphology-related parameters. The relationship between cell length and NaCl concentration is nonlinear.
Article
Plant Sciences
Alyona Grishina, Oksana Sherstneva, Anna Zhavoronkova, Maria Ageyeva, Tatiana Zdobnova, Maxim Lysov, Anna Brilkina, Vladimir Vodeneev
Summary: This study compares the efficiency of hyperspectral imaging and pulse amplitude modulation fluorometry in detecting plant pathogens, and finds that pulse amplitude modulation fluorometry allows for earlier assessment of physiological changes caused by infection.
