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Ekaterina Sukhova
Department of Biophysics, N.I. Lobachevsky State University of Nizhny Novgorod, 603950 Nizhny Novgorod, Russia

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Review
Published: 19 August 2021 in Plants
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In environmental conditions, plants are affected by abiotic and biotic stressors which can be heterogenous. This means that the systemic plant adaptive responses on their actions require long-distance stress signals including electrical signals (ESs). ESs are based on transient changes in the activities of ion channels and H+-ATP-ase in the plasma membrane. They influence numerous physiological processes, including gene expression, phytohormone synthesis, photosynthesis, respiration, phloem mass flow, ATP content, and many others. It is considered that these changes increase plant tolerance to the action of stressors; the effect can be related to stimulation of damages of specific molecular structures. In this review, we hypothesize that programmed cell death (PCD) in plant cells can be interconnected with ESs. There are the following points supporting this hypothesis. (i) Propagation of ESs can be related to ROS waves; these waves are a probable mechanism of PCD initiation. (ii) ESs induce the inactivation of photosynthetic dark reactions and activation of respiration. Both responses can also produce ROS and, probably, induce PCD. (iii) ESs stimulate the synthesis of stress phytohormones (e.g., jasmonic acid, salicylic acid, and ethylene) which are known to contribute to the induction of PCD. (iv) Generation of ESs accompanies K+ efflux from the cytoplasm that is also a mechanism of induction of PCD. Our review argues for the possibility of PCD induction by electrical signals and shows some directions of future investigations in the field.

ACS Style

Ekaterina Sukhova; Vladimir Sukhov. Electrical Signals, Plant Tolerance to Actions of Stressors, and Programmed Cell Death: Is Interaction Possible? Plants 2021, 10, 1704 .

AMA Style

Ekaterina Sukhova, Vladimir Sukhov. Electrical Signals, Plant Tolerance to Actions of Stressors, and Programmed Cell Death: Is Interaction Possible? Plants. 2021; 10 (8):1704.

Chicago/Turabian Style

Ekaterina Sukhova; Vladimir Sukhov. 2021. "Electrical Signals, Plant Tolerance to Actions of Stressors, and Programmed Cell Death: Is Interaction Possible?" Plants 10, no. 8: 1704.

Journal article
Published: 31 July 2021 in International Journal of Molecular Sciences
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H+-ATP-ases, which support proton efflux through the plasma membrane, are key molecular transporters for electrogenesis in cells of higher plants. Initial activities of the transporters can influence the thresholds of generation of electrical responses induced by stressors and modify other parameters of these responses. Previously, it was theoretically shown that the stochastic heterogeneity of individual cell thresholds for electrical responses in a system of electrically connected neuronal cells can decrease the total threshold of the system (“diversity-induced resonance”, DIR). In the current work, we tested a hypothesis about decreasing the thresholds of generation of cooling-induced electrical responses in a system of electrically connected plant cells with increasing stochastic spatial heterogeny in the initial activities of H+-ATP-ases in these cells. A two-dimensional model of the system of electrically connected excitable cells (simple imitation of plant leaf), which was based on a model previously developed in our works, was used for the present investigation. Simulation showed that increasing dispersion in the distribution of initial activities of H+-ATP-ases between cells decreased the thresholds of generation of cooling-induced electrical responses. In addition, the increasing weakly influenced the amplitudes of electrical responses. Additional analysis showed two different mechanisms of the revealed effect. The increasing spatial heterogeneity in activities of H+-ATP-ases induced a weak positive shift of the membrane potential at rest. The shift decreased the threshold of electrical response generation. However, the decreased threshold induced by increasing the H+-ATP-ase activity heterogeneity was also observed after the elimination of the positive shift. The result showed that the “DIR-like” mechanism also participated in the revealed effect. Finally, we showed that the standard deviation of the membrane potentials before the induction of action potentials could be used for the estimation of thresholds of cooling-induced plant electrical responses. Thus, spatial heterogeneity in the initial activities of H+-ATP-ases can be a new regulatory mechanism influencing the generation of electrical responses in plants under actions of stressors.

ACS Style

Ekaterina Sukhova; Daria Ratnitsyna; Vladimir Sukhov. Stochastic Spatial Heterogeneity in Activities of H+-ATP-Ases in Electrically Connected Plant Cells Decreases Threshold for Cooling-Induced Electrical Responses. International Journal of Molecular Sciences 2021, 22, 8254 .

AMA Style

Ekaterina Sukhova, Daria Ratnitsyna, Vladimir Sukhov. Stochastic Spatial Heterogeneity in Activities of H+-ATP-Ases in Electrically Connected Plant Cells Decreases Threshold for Cooling-Induced Electrical Responses. International Journal of Molecular Sciences. 2021; 22 (15):8254.

Chicago/Turabian Style

Ekaterina Sukhova; Daria Ratnitsyna; Vladimir Sukhov. 2021. "Stochastic Spatial Heterogeneity in Activities of H+-ATP-Ases in Electrically Connected Plant Cells Decreases Threshold for Cooling-Induced Electrical Responses." International Journal of Molecular Sciences 22, no. 15: 8254.

Journal article
Published: 01 May 2021 in Remote Sensing
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Plants are affected by numerous environmental factors that influence their physiological processes and productivity. Early revealing of their action based on measuring spectra of reflected light and calculating reflectance indices is an important stage in the protection of agricultural plants. Photochemical reflectance index (PRI) is a widely used parameter related to photosynthetic changes in plants under action of stressors. We developed a new system for proximal imaging of PRI based on using short pulses of measuring light detected simultaneously in green (530 nm) and yellow (570 nm) spectral bands. The system has several advances compared to those reported in literature. Active light illumination and subtraction of the ambient light allow for PRI measurements without periodic calibrations. Short duration of measuring pulses (18 ms) minimizes their influence on plants. Measurements in two spectral bands operated by separate cameras with aligned fields of visualization allow one to exclude mechanically switchable parts like filter wheels thus minimizing acquisition time and increasing durability of the setup. Absolute values of PRI and light-induced changes in PRI (ΔPRI) in pea leaves and changes of these parameters under action of light with different intensities, water shortage, and heating have been investigated using the developed setup. Changes in ΔPRI are shown to be more robust than the changes in the absolute value of PRI which is in a good agreement with our previous studies. Values of PRI and, especially, ΔPRI are strongly linearly related to the energy-dependent component of the non-photochemical quenching and can be potentially used for estimation of this component. Additionally, we demonstrate that the developed system can also measure fast changes in PRI (hundreds of milliseconds and seconds) under leaf illumination by the pulsed green-yellow measuring light. Thus, the developed system of proximal PRI imaging can be used for PRI measurements (including fast changes in PRI) and estimation of stressors-induced photosynthetic changes.

ACS Style

Vladimir Sukhov; Ekaterina Sukhova; Andrey Khlopkov; Lyubov Yudina; Anastasiia Ryabkova; Alexander Telnykh; Ekaterina Sergeeva; Vladimir Vodeneev; Ilya Turchin. Proximal Imaging of Changes in Photochemical Reflectance Index in Leaves Based on Using Pulses of Green-Yellow Light. Remote Sensing 2021, 13, 1762 .

AMA Style

Vladimir Sukhov, Ekaterina Sukhova, Andrey Khlopkov, Lyubov Yudina, Anastasiia Ryabkova, Alexander Telnykh, Ekaterina Sergeeva, Vladimir Vodeneev, Ilya Turchin. Proximal Imaging of Changes in Photochemical Reflectance Index in Leaves Based on Using Pulses of Green-Yellow Light. Remote Sensing. 2021; 13 (9):1762.

Chicago/Turabian Style

Vladimir Sukhov; Ekaterina Sukhova; Andrey Khlopkov; Lyubov Yudina; Anastasiia Ryabkova; Alexander Telnykh; Ekaterina Sergeeva; Vladimir Vodeneev; Ilya Turchin. 2021. "Proximal Imaging of Changes in Photochemical Reflectance Index in Leaves Based on Using Pulses of Green-Yellow Light." Remote Sensing 13, no. 9: 1762.

Journal article
Published: 27 April 2021 in Plants
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Local damage (e.g., burning) induces a variation potential (VP), which is an important electrical signal in higher plants. A VP propagates into undamaged parts of the plant and influences numerous physiological processes, including photosynthesis. Rapidly increasing plant tolerance to stressors is likely to be a result of the physiological changes. Thus, developing methods of revealing VP-induced physiological changes can be used for the remote sensing of plant systemic responses to local damage. Previously, we showed that burning-induced VP influenced a photochemical reflectance index in pea leaves, but the influence of the electrical signals on other reflectance indices was not investigated. In this study, we performed a complex analysis of the influence of VP induction by local burning on difference reflectance indices based on 400–700 nm wavelengths in leaves of pea seedlings. Heat maps of the significance of local burning-induced changes in the reflectance indices and their correlations with photosynthetic parameters were constructed. Large spectral regions with significant changes in these indices after VP induction were revealed. Most changes were strongly correlated to photosynthetic parameters. Some indices, which can be potentially effective for revealing local burning-induced photosynthetic changes, are separately shown. Our results show that difference reflectance indices based on 400–700 nm wavelengths can potentially be used for the remote sensing of plant systemic responses induced by local damages and subsequent propagation of VPs.

ACS Style

Ekaterina Sukhova; Lyubov Yudina; Ekaterina Gromova; Anastasiia Ryabkova; Vladimir Vodeneev; Vladimir Sukhov. Influence of Local Burning on Difference Reflectance Indices Based on 400–700 nm Wavelengths in Leaves of Pea Seedlings. Plants 2021, 10, 878 .

AMA Style

Ekaterina Sukhova, Lyubov Yudina, Ekaterina Gromova, Anastasiia Ryabkova, Vladimir Vodeneev, Vladimir Sukhov. Influence of Local Burning on Difference Reflectance Indices Based on 400–700 nm Wavelengths in Leaves of Pea Seedlings. Plants. 2021; 10 (5):878.

Chicago/Turabian Style

Ekaterina Sukhova; Lyubov Yudina; Ekaterina Gromova; Anastasiia Ryabkova; Vladimir Vodeneev; Vladimir Sukhov. 2021. "Influence of Local Burning on Difference Reflectance Indices Based on 400–700 nm Wavelengths in Leaves of Pea Seedlings." Plants 10, no. 5: 878.

Journal article
Published: 04 March 2021 in Remote Sensing
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A drought, which can be often accompanied by increased temperature, is a key adverse factor for agricultural plants. Remote sensing of early plant changes under water shortage is a prospective way to improve plant cultivation; in particular, the sensing can be based on measurement of difference reflectance indices (RIs). We complexly analyzed the efficiency of RIs based on 400–700 nm wavelengths for revealing the influences of water shortage and short-term heating on plant seedlings. We measured spectra of reflected light in leaves of pea, wheat, and pumpkin under control and stress conditions. All possible RIs in the 400–700 nm range were calculated, significances of differences between experimental and control indices were estimated, and heatmaps of the significances were constructed. It was shown that the water shortage (pea seedlings) changed absolute values of large quantity of calculated RIs. Absolute values of some RIs were significantly changed for 1–5 or 2–5 days of the water shortage; they were strongly correlated to the potential quantum yield of photosystem II and relative water content in leaves. In contrast, the short-term heating (pea, wheat, and pumpkin seedlings) mainly influenced light-induced changes in RIs. Our results show new RIs, which are potentially sensitive to the action of stressors.

ACS Style

Ekaterina Sukhova; Lyubov Yudina; Ekaterina Gromova; Anastasiia Ryabkova; Dmitry Kior; Vladimir Sukhov. Complex Analysis of the Efficiency of Difference Reflectance Indices on the Basis of 400–700 nm Wavelengths for Revealing the Influences of Water Shortage and Heating on Plant Seedlings. Remote Sensing 2021, 13, 962 .

AMA Style

Ekaterina Sukhova, Lyubov Yudina, Ekaterina Gromova, Anastasiia Ryabkova, Dmitry Kior, Vladimir Sukhov. Complex Analysis of the Efficiency of Difference Reflectance Indices on the Basis of 400–700 nm Wavelengths for Revealing the Influences of Water Shortage and Heating on Plant Seedlings. Remote Sensing. 2021; 13 (5):962.

Chicago/Turabian Style

Ekaterina Sukhova; Lyubov Yudina; Ekaterina Gromova; Anastasiia Ryabkova; Dmitry Kior; Vladimir Sukhov. 2021. "Complex Analysis of the Efficiency of Difference Reflectance Indices on the Basis of 400–700 nm Wavelengths for Revealing the Influences of Water Shortage and Heating on Plant Seedlings." Remote Sensing 13, no. 5: 962.

Journal article
Published: 15 February 2021 in Plants
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Variation potential (VP) is an important long-distance electrical signal in higher plants that is induced by local damages, influences numerous physiological processes, and participates in plant adaptation to stressors. The transmission of increased hydraulic pressure through xylem vessels is the probable mechanism of VP propagation in plants; however, the rates of the pressure transmission and VP propagation can strongly vary. We analyzed this problem on the basis of a simple mathematical model of the pressure distribution along a xylem vessel, which was approximated by a tube with a pressure gradient. It is assumed that the VP is initiated if the integral over pressure is more than a threshold one, taking into account that the pressure is transiently increased in the initial point of the tube and is kept constant in the terminal point. It was shown that this simple model can well describe the parameters of VP propagation in higher plants, including the increase in time before VP initiation and the decrease in the rate of VP propagation with an increase in the distance from the zone of damage. Considering three types of the pressure dynamics, our model predicts that the velocity of VP propagation can be stimulated by an increase in the length of a plant shoot and also depends on pressure dynamics in the damaged zone. Our results theoretically support the hypothesis about the impact of pressure variations in xylem vessels on VP propagation.

ACS Style

Ekaterina Sukhova; Elena Akinchits; Sergey Gudkov; Roman Pishchalnikov; Vladimir Vodeneev; Vladimir Sukhov. A Theoretical Analysis of Relations between Pressure Changes along Xylem Vessels and Propagation of Variation Potential in Higher Plants. Plants 2021, 10, 372 .

AMA Style

Ekaterina Sukhova, Elena Akinchits, Sergey Gudkov, Roman Pishchalnikov, Vladimir Vodeneev, Vladimir Sukhov. A Theoretical Analysis of Relations between Pressure Changes along Xylem Vessels and Propagation of Variation Potential in Higher Plants. Plants. 2021; 10 (2):372.

Chicago/Turabian Style

Ekaterina Sukhova; Elena Akinchits; Sergey Gudkov; Roman Pishchalnikov; Vladimir Vodeneev; Vladimir Sukhov. 2021. "A Theoretical Analysis of Relations between Pressure Changes along Xylem Vessels and Propagation of Variation Potential in Higher Plants." Plants 10, no. 2: 372.

Journal article
Published: 13 January 2021 in Cells
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Photosynthesis is an important target of action of numerous environmental factors; in particular, stressors can strongly affect photosynthetic light reactions. Considering relations of photosynthetic light reactions to electron and proton transport, it can be supposed that extremely low frequency magnetic field (ELFMF) may influence these reactions; however, this problem has been weakly investigated. In this paper, we experimentally tested a hypothesis about the potential influence of ELFMF of 18 µT intensity with Schumann resonance frequencies (7.8, 14.3, and 20.8 Hz) on photosynthetic light reactions in wheat and pea seedlings. It was shown that ELFMF decreased non-photochemical quenching in wheat and weakly influenced quantum yield of photosystem II at short-term treatment; in contrast, the changes in potential and effective quantum yields of photosystem II were observed mainly under chronic action of ELFMF. It is interesting that both short-term and chronic treatment decreased the time periods for 50% activation of quantum yield and non-photochemical quenching under illumination. Influence of ELFMF on pea was not observed at both short-term and chronic treatment. Thus, we showed that ELFMF with Schumann resonance frequencies could influence photosynthetic light processes; however, this effect depends on plant species (wheat or pea) and type of treatment (short-term or chronic).

ACS Style

Vladimir Sukhov; Ekaterina Sukhova; Yulia Sinitsyna; Ekaterina Gromova; Natalia Mshenskaya; Anastasiia Ryabkova; Nikolay Ilin; Vladimir Vodeneev; Evgeny Маreev; Colin Price. Influence of Magnetic Field with Schumann Resonance Frequencies on Photosynthetic Light Reactions in Wheat and Pea. Cells 2021, 10, 149 .

AMA Style

Vladimir Sukhov, Ekaterina Sukhova, Yulia Sinitsyna, Ekaterina Gromova, Natalia Mshenskaya, Anastasiia Ryabkova, Nikolay Ilin, Vladimir Vodeneev, Evgeny Маreev, Colin Price. Influence of Magnetic Field with Schumann Resonance Frequencies on Photosynthetic Light Reactions in Wheat and Pea. Cells. 2021; 10 (1):149.

Chicago/Turabian Style

Vladimir Sukhov; Ekaterina Sukhova; Yulia Sinitsyna; Ekaterina Gromova; Natalia Mshenskaya; Anastasiia Ryabkova; Nikolay Ilin; Vladimir Vodeneev; Evgeny Маreev; Colin Price. 2021. "Influence of Magnetic Field with Schumann Resonance Frequencies on Photosynthetic Light Reactions in Wheat and Pea." Cells 10, no. 1: 149.

Journal article
Published: 16 November 2020 in Plants
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Local damage (e.g., burning, heating, or crushing) causes the generation and propagation of a variation potential (VP), which is a unique electrical signal in higher plants. A VP influences numerous physiological processes, with photosynthesis and respiration being important targets. VP generation is based on transient inactivation of H+-ATPase in plasma membrane. In this work, we investigated the participation of this inactivation in the development of VP-induced photosynthetic and respiratory responses. Two- to three-week-old pea seedlings (Pisum sativum L.) and their protoplasts were investigated. Photosynthesis and respiration in intact seedlings were measured using a GFS-3000 gas analyzer, Dual-PAM-100 Pulse-Amplitude-Modulation (PAM)-fluorometer, and a Dual-PAM gas-exchange Cuvette 3010-Dual. Electrical activity was measured using extracellular electrodes. The parameters of photosynthetic light reactions in protoplasts were measured using the Dual-PAM-100; photosynthesis- and respiration-related changes in O2 exchange rate were measured using an Oxygraph Plus System. We found that preliminary changes in the activity of H+-ATPase in the plasma membrane (its inactivation by sodium orthovanadate or activation by fusicoccin) influenced the amplitudes and magnitudes of VP-induced photosynthetic and respiratory responses in intact seedlings. Decreases in H+-ATPase activity (sodium orthovanadate treatment) induced fast decreases in photosynthetic activity and increases in respiration in protoplasts. Thus, our results support the effect of H+-ATPase inactivation on VP-induced photosynthetic and respiratory responses.

ACS Style

Lyubov Yudina; Oksana Sherstneva; Ekaterina Sukhova; Marina Grinberg; Sergey Mysyagin; Vladimir Vodeneev; Vladimir Sukhov. Inactivation of H+-ATPase Participates in the Influence of Variation Potential on Photosynthesis and Respiration in Peas. Plants 2020, 9, 1585 .

AMA Style

Lyubov Yudina, Oksana Sherstneva, Ekaterina Sukhova, Marina Grinberg, Sergey Mysyagin, Vladimir Vodeneev, Vladimir Sukhov. Inactivation of H+-ATPase Participates in the Influence of Variation Potential on Photosynthesis and Respiration in Peas. Plants. 2020; 9 (11):1585.

Chicago/Turabian Style

Lyubov Yudina; Oksana Sherstneva; Ekaterina Sukhova; Marina Grinberg; Sergey Mysyagin; Vladimir Vodeneev; Vladimir Sukhov. 2020. "Inactivation of H+-ATPase Participates in the Influence of Variation Potential on Photosynthesis and Respiration in Peas." Plants 9, no. 11: 1585.

Journal article
Published: 04 October 2020 in Biology
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Abscisic acid (ABA) is an important hormone in plants that participates in their acclimation to the action of stressors. Treatment by exogenous ABA and its synthetic analogs are a potential way of controlling the tolerance of agricultural plants; however, the mechanisms of influence of the ABA treatment on photosynthetic processes require further investigations. The aim of our work was to investigate the participation of inactivation of the plasma membrane H+-ATP-ase on the influence of ABA treatment on photosynthetic processes and their regulation by electrical signals in peas. The ABA treatment of seedlings was performed by spraying them with aqueous solutions (10−5 M). The combination of a Dual-PAM-100 PAM fluorometer and GFS-3000 infrared gas analyzer was used for photosynthetic measurements; the patch clamp system on the basis of a SliceScope Pro 2000 microscope was used for measurements of electrical activity. It was shown that the ABA treatment stimulated the cyclic electron flow around photosystem I and decreased the photosynthetic CO2 assimilation, the amplitude of burning-induced electrical signals (variation potentials), and the magnitude of photosynthetic responses relating to these signals; in contrast, treatment with exogenous ABA increased the heat tolerance of photosynthesis. An investigation of the influence of ABA treatment on the metabolic component of the resting potential showed that this treatment decreased the activity of the H+-ATP-ase in the plasma membrane. Inhibitor analysis using sodium orthovanadate demonstrated that this decrease may be a mechanism of the ABA treatment-induced changes in photosynthetic processes, their heat tolerance, and regulation by electrical signals.

ACS Style

Lyubov Yudina; Ekaterina Sukhova; Oksana Sherstneva; Marina Grinberg; Maria Ladeynova; Vladimir Vodeneev; Vladimir Sukhov. Exogenous Abscisic Acid Can Influence Photosynthetic Processes in Peas through a Decrease in Activity of H+-ATP-ase in the Plasma Membrane. Biology 2020, 9, 324 .

AMA Style

Lyubov Yudina, Ekaterina Sukhova, Oksana Sherstneva, Marina Grinberg, Maria Ladeynova, Vladimir Vodeneev, Vladimir Sukhov. Exogenous Abscisic Acid Can Influence Photosynthetic Processes in Peas through a Decrease in Activity of H+-ATP-ase in the Plasma Membrane. Biology. 2020; 9 (10):324.

Chicago/Turabian Style

Lyubov Yudina; Ekaterina Sukhova; Oksana Sherstneva; Marina Grinberg; Maria Ladeynova; Vladimir Vodeneev; Vladimir Sukhov. 2020. "Exogenous Abscisic Acid Can Influence Photosynthetic Processes in Peas through a Decrease in Activity of H+-ATP-ase in the Plasma Membrane." Biology 9, no. 10: 324.

Journal article
Published: 21 April 2020 in Remote Sensing
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Measurement and analysis of the numerous reflectance indices of plants is an effective approach for the remote sensing of plant physiological processes in agriculture and ecological monitoring. A photochemical reflectance index (PRI) plays an important role in this kind of remote sensing because it can be related to early changes in photosynthetic processes under the action of stressors (excess light, changes in temperature, drought, etc.). In particular, we previously showed that light-induced changes in PRIs could be strongly related to the energy-dependent component of the non-photochemical quenching in photosystem II. The aim of the present work was to undertake comparative analysis of the efficiency of using light-induced changes in PRIs (ΔPRIs) based on different wavelengths for the estimation of the parameters of photosynthetic light reactions (including the parameters of photosystem I). Pea plants were used in the investigation; the photosynthetic parameters were measured using the pulse-amplitude-modulated (PAM) fluorometer Dual-PAM-100 and the intensities of the reflected light were measured using the spectrometer S100. The ΔPRIs were calculated as ΔPRI(band,570), where the band was 531 nm for the typical PRI and 515, 525, 535, 545, or 555 nm for modified PRIs; 570 nm was the reference wavelength for all PRIs. There were several important results: (1) ∆PRI(525,570), ∆PRI(531,570), ∆PRI(535,570), and ∆PRI(545,570) could be used for estimation of most of the photosynthetic parameters under light only or under dark only conditions. (2) The combination of dark and light conditions decreased the efficiency of ∆PRIs for the estimation of the photosynthetic parameters; ∆PRI(535,570) and ∆PRI(545,570) had maximal efficiency under these conditions. (3) ∆PRI(515,570) and ∆PRI(525,570) mainly included the slow-relaxing component of PRI; in contrast, ∆PRI(531,570), ∆PRI(535,570), ∆PRI(545,570), and ∆PRI(555,570) mainly included the fast-relaxing component of PRI. These components were probably caused by different mechanisms.

ACS Style

Ekaterina Sukhova; Vladimir Sukhov. Relation of Photochemical Reflectance Indices Based on Different Wavelengths to the Parameters of Light Reactions in Photosystems I and II in Pea Plants. Remote Sensing 2020, 12, 1312 .

AMA Style

Ekaterina Sukhova, Vladimir Sukhov. Relation of Photochemical Reflectance Indices Based on Different Wavelengths to the Parameters of Light Reactions in Photosystems I and II in Pea Plants. Remote Sensing. 2020; 12 (8):1312.

Chicago/Turabian Style

Ekaterina Sukhova; Vladimir Sukhov. 2020. "Relation of Photochemical Reflectance Indices Based on Different Wavelengths to the Parameters of Light Reactions in Photosystems I and II in Pea Plants." Remote Sensing 12, no. 8: 1312.

Research paper
Published: 09 March 2020 in Plant Signaling & Behavior
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Electrical signals (ESs) can be induced by local action of stressors in plants; they influence numerous physiological processes (photosynthesis, transpiration, respiration, genes expression, synthesis of phytohormones, etc.) and, thereby, induce a systemic adaptation response. Development of optical methods of a remote sensing of this response can be important for agricultural and ecological monitoring. Preliminarily, we showed (Sukhova et al., Plant Sign Behav 2019; 14:e1610301) that burning-induced ESs induced changes in leaf reflectance at broad spectral bands (400-500, 500-600, 600-700, and 700-800 nm). The aims of the present work were (i) investigation of ESs influence on difference reflectance indices (RIs) calculated on the basis of these broad spectral bands and (ii) analysis of connection of the indices with water content in plants. Pea seedlings were investigated. ESs were induced by burning of the first mature leaf; ESs had high amplitudes in the second leaf and had low amplitudes in the fourth leaf. It was shown that ESs induced significant changes in RIs, which were calculated on basis of intensities of the reflected light at (i) 400-500 and 600-700 nm, (ii) 500-600 and 700-800 nm, and (iii) 600-700 and 700-800 nm. The effect was strong in the second leaf and weak in the fourth leaf; that is, the response was dependent on the magnitude of ESs. ESs-induced changes in RI were strongly connected with ESs-induced decrease of leaf water content which was estimated on basis of decrease of water index. Thus, broadband RIs can be used for revealing the ESs-induced systemic stress response in plants.

ACS Style

Ekaterina Sukhova; Lyubov Yudina; Ekaterina Gromova; Vladimir Nerush; Vladimir Vodeneev; Vladimir Sukhov. Burning-induced electrical signals influence broadband reflectance indices and water index in pea leaves. Plant Signaling & Behavior 2020, 15, 1737786 .

AMA Style

Ekaterina Sukhova, Lyubov Yudina, Ekaterina Gromova, Vladimir Nerush, Vladimir Vodeneev, Vladimir Sukhov. Burning-induced electrical signals influence broadband reflectance indices and water index in pea leaves. Plant Signaling & Behavior. 2020; 15 (4):1737786.

Chicago/Turabian Style

Ekaterina Sukhova; Lyubov Yudina; Ekaterina Gromova; Vladimir Nerush; Vladimir Vodeneev; Vladimir Sukhov. 2020. "Burning-induced electrical signals influence broadband reflectance indices and water index in pea leaves." Plant Signaling & Behavior 15, no. 4: 1737786.

Journal article
Published: 09 December 2019 in Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms
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An analysis of photosynthetic response on action of stressors is an important problem, which can be solved by experimental and theoretical methods, including mathematical modeling of photosynthetic processes. The aim of our work was elaboration of a mathematical model, which simulated development of a nonphotochemical quenching under different light conditions. We analyzed two variants of the model: the first variant included a light-induced activation of the electron transport chain; in contrast, the second variant did not describe this activation. Both variants of the model described interactions between transitions from open reaction centers to closed ones (and vice versa) and development of the nonphotochemical quenching. Investigation of both variants of the model showed well qualitative and quantitative accordance between simulated and experimental changes in coefficient of the nophotochemical quenching which were analyzed under different light regimes: (i) the stepped increase of the light intensity without dark intervals between steps, (ii) periodical illuminations by different light intensities with constant durations which were separated by constant dark intervals, and (iii) periodical illuminations by the constant light intensity with different durations which were separated by different dark intervals. Thus, the model can be used for theoretical prediction of stress changes in photosynthesis under fluctuations in light intensity and search of optimal regimes of plant illumination.

ACS Style

Ekaterina Sukhova; Andrey Khlopkov; Vladimir Vodeneev; Vladimir Sukhov. Simulation of a nonphotochemical quenching in plant leaf under different light intensities. Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms 2019, 1861, 148138 .

AMA Style

Ekaterina Sukhova, Andrey Khlopkov, Vladimir Vodeneev, Vladimir Sukhov. Simulation of a nonphotochemical quenching in plant leaf under different light intensities. Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms. 2019; 1861 (2):148138.

Chicago/Turabian Style

Ekaterina Sukhova; Andrey Khlopkov; Vladimir Vodeneev; Vladimir Sukhov. 2019. "Simulation of a nonphotochemical quenching in plant leaf under different light intensities." Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms 1861, no. 2: 148138.

Journal article
Published: 04 April 2019 in Remote Sensing
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The photochemical reflectance index (PRI) is a widely used spectral index which can show stress-induced changes in photosynthesis (e.g., increase of the nonphotochemical quenching of chlorophyll fluorescence (NPQ)). The artificial illumination of plants improves the efficiency of estimation of photosynthetic processes on the basis of PRI measurements. However, the simultaneous activity of different light sources with different locations can disturb the measurement of PRI. Using pulses of a green-yellow measuring light can potentially solve this problem. The aim of the present work was to investigate the possibility of using green-yellow light pulses for the investigation of light-induced changes in PRI in higher plants (pea, wheat, and pumpkin) and for the analysis of connection between PRI and the energy-dependent component of NPQ (NPQF). First, we showed that using green-yellow light pulses eliminated shifts of reflected light, which were connected with the application of a red actinic light. Second, analysis of light dependences of NPQF, the absolute value of PRI, and changes in PRI (the difference between the PRI under the actinic light and the initial value of PRI without this light, ΔPRI) showed that the dynamics of the increase of NPQF and the decrease of PRI and ΔPRI were similar. Changes in NPQF and ΔPRI were found to be significant. In contrast, changes in the absolute value of PRI were not significant in most of the variants of the experiments. Third, scatter plots between NPQF and ΔPRI showed similar linear correlations for investigated species; moreover, a total set of experimental points (for pea, wheat, and pumpkin) were also described by the same linear regression. Thus, our results show that (i) pulses of green-yellow measuring light can be used for measurements of PRI, and (ii) ΔPRI is a more effective indicator for the estimation of NPQ than the absolute value of PRI.

ACS Style

Ekaterina Sukhova; Vladimir Sukhov. Analysis of Light-Induced Changes in the Photochemical Reflectance Index (PRI) in Leaves of Pea, Wheat, and Pumpkin Using Pulses of Green-Yellow Measuring Light. Remote Sensing 2019, 11, 810 .

AMA Style

Ekaterina Sukhova, Vladimir Sukhov. Analysis of Light-Induced Changes in the Photochemical Reflectance Index (PRI) in Leaves of Pea, Wheat, and Pumpkin Using Pulses of Green-Yellow Measuring Light. Remote Sensing. 2019; 11 (7):810.

Chicago/Turabian Style

Ekaterina Sukhova; Vladimir Sukhov. 2019. "Analysis of Light-Induced Changes in the Photochemical Reflectance Index (PRI) in Leaves of Pea, Wheat, and Pumpkin Using Pulses of Green-Yellow Measuring Light." Remote Sensing 11, no. 7: 810.

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Published: 16 May 2018 in Remote Sensing
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The development of spectral methods of remote sensing, including measurement of a photochemical reflectance index (PRI), is a prospective trend in precision agriculture. There are many works which have investigated the connection between photosynthetic parameters and PRI; however, their results varied and were sometimes contradictory. For this paper, we performed a meta-analysis of works in this field. Here, only linear correlations of PRI with photosynthetic parameters—including quantum yield of photosystem II (ΔF/Fm’), nonphotochemical quenching of chlorophyll fluorescence (NPQ), and light use efficiency (LUE)—were investigated. First, it was shown that the correlations were dependent on conditions of PRI measurements (leaf or canopy; artificial light or sunlight). Second, it was shown that a minimal level of the photosynthetic stress, and the variation of this level among investigated plants, can influence the linear correlation of PRI with ΔF/Fm’ and NPQ; the effect was dependent on conditions of measurements. In contrast, the distribution of LUE among plants did not influence its correlation with PRI. Thus, the meta-analysis shows that the distribution of photosynthetic parameters among investigated plants can be an important factor that influences the efficiency of remote sensing on the basis of the PRI measurement.

ACS Style

Ekaterina Sukhova; Vladimir Sukhov. Connection of the Photochemical Reflectance Index (PRI) with the Photosystem II Quantum Yield and Nonphotochemical Quenching Can Be Dependent on Variations of Photosynthetic Parameters among Investigated Plants: A Meta-Analysis. Remote Sensing 2018, 10, 771 .

AMA Style

Ekaterina Sukhova, Vladimir Sukhov. Connection of the Photochemical Reflectance Index (PRI) with the Photosystem II Quantum Yield and Nonphotochemical Quenching Can Be Dependent on Variations of Photosynthetic Parameters among Investigated Plants: A Meta-Analysis. Remote Sensing. 2018; 10 (5):771.

Chicago/Turabian Style

Ekaterina Sukhova; Vladimir Sukhov. 2018. "Connection of the Photochemical Reflectance Index (PRI) with the Photosystem II Quantum Yield and Nonphotochemical Quenching Can Be Dependent on Variations of Photosynthetic Parameters among Investigated Plants: A Meta-Analysis." Remote Sensing 10, no. 5: 771.