Papers by Vladimir Kreslavski
During a plant life, light is necessary not only as a source of energy, but also as a regulatory ... more During a plant life, light is necessary not only as a source of energy, but also as a regulatory factor of plant metabolism with information signal function. In this review we consider basic links of primary stages of light signal transduction in higher plants. The transformation circuits and possible pathways of photoreceptor light signal transduction, as well as possible roles of photoreceptor-interacting proteins, secondary messengers and some transcriptional factors are discussed. The review is also focused on examination of rapid signaling events such as activation of ion exchange systems as well as interaction of photoreceptors in signaling pathways.
New Approaches to the Molecular, Cellular, and Organismal Levels, 2015
Protoplasma, 2016
The reduced content of photoreceptors, such as phytochromes, can decrease the efficiency of photo... more The reduced content of photoreceptors, such as phytochromes, can decrease the efficiency of photosynthesis and activity of the photosystem II (PSII). For the confirmation of this hypothesis, the effect of deficiency in both phytochromes (Phy) A and B (double mutant, DM) in 7-27-day-old Arabidopsis thaliana plants on the photosynthetic activity was studied in absence and presence of UV-A radiation as a stress factor. The DM with reduced content of apoproteins of PhyA and PhyB and wild type (WT) plants with were grown in white and red light (WL and RL, respectively) of high (130 μmol quanta m(-2) s(-1)) and low (40 μmol quanta m(-2) s(-1)) intensity. For DM and WT grown in WL, no notable difference in the photochemical activity of PSII was observed. However, the resistance of the photosynthetic apparatus (PA) to UV-A and the rate of photosynthesis under light saturation were lower in the DM compared to those in the WT. Growth in RL, when the photoreceptors of blue light-cryptochromes-are inactive, resulted in the significant decrease of the photochemical activity of PSII in DM compared to that in WT including amounts of QB-non-reducing complexes of PSII and noticeable enhancement of thermal dissipation of absorbed light energy. In addition, marked distortion of the thylakoid membrane structure was observed for DM grown in RL. It is suggested that not only PhyA and PhyB but also cryptochromes are necessary for normal functioning of the PA and formation of the mechanisms of its resistance to UV-radiation.
New Approaches to the Molecular, Cellular, and Organismal Levels, 2015
Biofuel Research Journal, 2015
Photobioelectrochemical photoconverters based on photosynthetic systems are discussed Strateg... more Photobioelectrochemical photoconverters based on photosynthetic systems are discussed Strategies used to improve the efficiency of photobioelectrochemical cells were presented Advantages and disadvantages of photobioelectrochemical cells were highlighted GRAPHICAL ABSTRACT ARTICLE INFO ABSTRACT Article history:
Russian Agricultural Sciences, 2010
It is shown that pretreatment of wheat seeds with chlorocholine chloride reduces inhibition of ph... more It is shown that pretreatment of wheat seeds with chlorocholine chloride reduces inhibition of photosystem 2 activity in the first leaves of 10 day old wheat variety Moskovskaya 35 seedlings caused by heating at 39-41°C for 5-20 min and improves its poststress recovery, probably due to activation of antioxi dant enzymes and increase in the level of low molecular weight antioxidants.
Advances in Photosynthesis and Respiration, 2011
Effects of red light (R), far-red light (FR) and UV radiation on growth and greening of lettuce s... more Effects of red light (R), far-red light (FR) and UV radiation on growth and greening of lettuce seedlings (Latuca sativa L., cv. Berlinskii) have been investigated. UV-B and UV-C inhibited hypocotyl elongation and stimulated cotyledonary growth. R in combination with UV-B and UV-C partly eliminated these effects, but FR increased those and reversed the R effect. Chlorophyll accumulation was inhibited by UV-B and UV-C. In comparison with cotyledonary growth, R strengthened the UV inhibitory effect, and FR reversed this effect of R. Thus, UV and phytochrome system modify the effects of each other on hypocotyl and leaf growth in lettuce seedlings depending on the level of active phytochrome formed.
There are several target sites for elevated temperature-induced damage in plants such as the oxyg... more There are several target sites for elevated temperature-induced damage in plants such as the oxygen evolving complex along with the associated cofactors in photosystem II (PS II), the ATP generating system and carbon fixation by Rubisco due to Rubisco activase. The impairment of the photosynthetic machinery (PM) leads to the generation of reactive oxygen species (ROS), such as singlet oxygen in PS II, superoxide radical ( . O 2 -) in PS I, and others. Moderately high temperatures do not cause direct damage to PS II but through ROS. The balance between (pro) oxidant and antioxidant levels, light intensity during heating and ATP supply are the crucial factors for the extent of recovery of PM from heat induced damage. Most recent investigations on heat stress responses are focused on the role of heat shock transcription factors (HSFs), chaperones, and heat-induced genes important for plant cell heat acclimation. With little information about chloroplastic (photosynthetic) heat tolerance. HSFs can be sensitive sensors for the effect of heat stress on thylakoid membranes, although, the mechanism of
Measuring of the photosynthetic machinery characteristics is widely used approach for estimation ... more Measuring of the photosynthetic machinery characteristics is widely used approach for estimation of photosynthetic tolerance. Unicellular phototrophs are excellent biological models to investigate the responses of photosynthetic machinery to changing environmental conditions. Bellow we describe the useful methods for measuring cyanobacterial photosynthesis under different environments, and the technique to estimate the rate of photosynthetic carbon fixation and distribution of fixed carbon between photosynthetic products in symbiotic microalgae (dinoflagellates). This chapter consists of two parts. The first part describes the methods for cyanobacteria cultivation under standard and variable (irradiance, salinity, and chemical treatments) conditions, delayed chlorophyll fluorescence to estimate activity and tolerance of cyanobacterial photosynthetic machinery, and measuring of oxygen evolution and photosynthetic electron transport in cyanobacterial cells during development of oxidative stress. The second part of the chapter is related to technique of coral(s) collection and their maintenance in a laboratory conditions, isolation of symbiotic dinoflagellates from the host, and the method for measuring of photosynthetic 14 CO 2 /H 14 CO 3 fixation rate and separation, and estimation of ethanol water-soluble compounds forming during photosynthesis.
Biochimica et biophysica acta, 2014
This review provides an overview about recent developments and current knowledge about monitoring... more This review provides an overview about recent developments and current knowledge about monitoring, generation and the functional role of reactive oxygen species (ROS) - H2O2, HO2, HO, OH(-), (1)O2 and O2(-) - in both oxidative degradation and signal transduction in photosynthetic organisms including microscopic techniques for ROS detection and controlled generation. Reaction schemes elucidating formation, decay and signaling of ROS in cyanobacteria as well as from chloroplasts to the nuclear genome in eukaryotes during exposure of oxygen-evolving photosynthetic organisms to oxidative stress are discussed that target the rapidly growing field of regulatory effects of ROS on nuclear gene expression.
Molecular Stress Physiology of Plants, 2013
The mechanisms of action of stressors, such as high light intensity and heat stress, on the photo... more The mechanisms of action of stressors, such as high light intensity and heat stress, on the photosynthetic machinery, primarily on the photosystem II, are reviewed. First of all, stressors alter the chemical composition of thylakoid membranes and decrease the activity of photosynthesis. Photodamage is caused by the direct effect of light on oxygen-evolving complex, whereas accumulation of reactive oxygen species due to high light or high temperatures causes suppression of the de novo synthesis of the reaction center proteins and, ultimately, leads to the inhibition of the recovery of photosystem II. In addition to their destructive and inhibitory action, the reactive oxygen species and products of lipid peroxidation trigger protective processes that lead to acclimatization. Particular attention is paid to the mechanisms that protect photosynthetic machinery from injury and to the inhibitory effect of stressors in the light of varying intensity. The known stress sensory systems of cyanobacteria are also reviewed.
Biomimetics Learning from Nature, 2010
I believe that water will one day be used as a fuel, because the hydrogen and oxygen which consti... more I believe that water will one day be used as a fuel, because the hydrogen and oxygen which constitute it, used separately or together, will furnish an inexhaustible source of heat and light. I therefore believe that, when coal deposits are oxidized, we will heat ourselves be means of water. Water is the coal of the future" Jules Verne, 1875
Russian Journal of Plant Physiology, 2012
The review considers the role of H 2 O 2 , 1 O 2 , , and the products of lipid peroxidation as si... more The review considers the role of H 2 O 2 , 1 O 2 , , and the products of lipid peroxidation as sig naling molecules in the processes of stress signal transduction in plants. The data concerning possible ROS participation in transduction of stress signals from chloroplasts to the nuclear genome, H 2 O 2 involvement in transduction stress signals in cyanobacteria, and also the interactions between ROS and other signaling sys tems within the cell are presented. It is suggested that redox regulators, protein kinases/protein phosphatases, and transcription factors play a crucial role in the functioning of ROS dependent signaling systems in the plant cell.
Plant Physiology and Biochemistry, 2014
The acute effects of three typical polyromatic hydrocarbons (PAHs): naphthalene (Naph), phenanthr... more The acute effects of three typical polyromatic hydrocarbons (PAHs): naphthalene (Naph), phenanthrene (Phen) and fluoranthene (Flu) on photochemical activity of photosystem II (PSII) in detached leaves of 3week-old pea plants were studied. The leaves were exposed in water with PAHs under white light for 0.5 e72 h. The activity of PSII was examined by prompt and delayed chlorophyll a (Chl a) fluorescence. The effects of PAHs depended on their concentration and exposure time. This dependency was more significant in the presence of chemical stressors (Triton X-100 or acetone) or under high intensity irradiance. Increased content of PAHs and long-term exposure (24e72 h) led to significant reduction of the maximum photochemical quantum efficiency (F v /F m ) of PS II, changes in the polyphasic fluorescence induction (OJIP), and to decreasing amplitudes of fast and slow components of delayed Chl a fluorescence. The damage of PSII depended on water solubility of a given type of PAHs, their concentration and exposure time. During short-time exposure the compound with highest water-solubility e naphthalene e revealed the strongest effect. During long-time exposure the compounds with low water-solubility ePhen, Flu-revealed the strongest effect as the corresponding PAH accumulates in the thylakoids especially when the solution is oversaturated containing a solid phase. The reduction of PSII activity at the presence of naphthalene (30 mg L À1 ) was accompanied by transient generation of H 2 O 2 as well as swelling of thylakoids and distortion of cell plasma membranes, which was indicated by electron microscopy images. Distortion of thylakoid membranes due to accumulation of PAHs as well as the development of oxidative stress seems to be the main pathways of PAHs influencing the photochemical activity of PS II.
Photochemical & Photobiological Sciences, 2009
Detection of the D 0 →D 1 transition of β-carotene radical cation photoinduced in photosystem II ... more Detection of the D 0 →D 1 transition of β-carotene radical cation photoinduced in photosystem II T. Okubo, T. Tomo and T. Noguchi, Photochem. Photobiol. Sci.
Journal of Photochemistry and Photobiology B: Biology, 2014
The expression of cold-induced genes, which are controlled by the cold sensor histidine kinase Hi... more The expression of cold-induced genes, which are controlled by the cold sensor histidine kinase Hik33, and the formation of ω(3) polyunsaturated fatty acids are controlled by light in the cyanobacterium Synechocystis sp. PCC 6803. Cold-induced Hik33-dependent gene expression is initiated by red light (∼700nm), but not by blue or green light. Red light also turns on the ω(3) fatty acid desaturation. Different combinations of other wavelengths in red spectral region (635 and 726nm) had no effect on the red-light-activated cold-induced transcription or fatty acid desaturation. Therefore, the involvement of phytochrome-like photoreceptor(s), similar to phytochromes of higher plants, in this regulation was not confirmed. The absence of light-dependence of gene expression in the mutant cells deficient in Hik33 suggests the involvement of this histidine kinase in direct or mediated with red light regulation of cold responses in Synechocystis.
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Papers by Vladimir Kreslavski