Oxygen and ROS in Photosynthesis

Khorobrykh, Sergey; Havurinne, Vesa; Mattila, Heta; Tyystjärvi, Esa

doi:10.3390/plants9010091

Cited by 188 publications

(160 citation statements)

References 444 publications

(697 reference statements)

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“…PSI deactivation is all suppressed when atmospheric O 2 partial pressure drops to 2 kPa. The atmospheric rSP illumination treatment then produces a superoxide radical (O 2 − ) in PSI [32,[40][41][42][43]. These results suggest that the electrons accumulated on the PSI acceptor side during one light pulse are used for O 2 reduction, which triggers the O 2 − production reflected as P700* accumulation.…”

Section: The Accumulation Of Electrons In the Psi Acceptor Side Promomentioning

confidence: 99%

Molecular Mechanism of Oxidation of P700 and Suppression of ROS Production in Photosystem I in Response to Electron-Sink Limitations in C3 Plants

Miyake

2020

Antioxidants

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Photosynthesis fixes CO2 and converts it to sugar, using chemical-energy compounds of both NADPH and ATP, which are produced in the photosynthetic electron transport system. The photosynthetic electron transport system absorbs photon energy to drive electron flow from Photosystem II (PSII) to Photosystem I (PSI). That is, both PSII and PSI are full of electrons. O2 is easily reduced to a superoxide radical (O2−) at the reducing side, i.e., the acceptor side, of PSI, which is the main production site of reactive oxygen species (ROS) in photosynthetic organisms. ROS-dependent inactivation of PSI in vivo has been reported, where the electrons are accumulated at the acceptor side of PSI by artificial treatments: exposure to low temperature and repetitive short-pulse (rSP) illumination treatment, and the accumulated electrons flow to O2, producing ROS. Recently, my group found that the redox state of the reaction center of chlorophyll P700 in PSI regulates the production of ROS: P700 oxidation suppresses the production of O2− and prevents PSI inactivation. This is why P700 in PSI is oxidized upon the exposure of photosynthesis organisms to higher light intensity and/or low CO2 conditions, where photosynthesis efficiency decreases. In this study, I introduce a new molecular mechanism for the oxidation of P700 in PSI and suppression of ROS production from the robust relationship between the light and dark reactions of photosynthesis. The accumulated protons in the lumenal space of the thylakoid membrane and the accumulated electrons in the plastoquinone (PQ) pool drive the rate-determining step of the P700 photo-oxidation reduction cycle in PSI from the photo-excited P700 oxidation to the reduction of the oxidized P700, thereby enhancing P700 oxidation.

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Section: The Accumulation Of Electrons In the Psi Acceptor Side Promomentioning

confidence: 99%

Molecular Mechanism of Oxidation of P700 and Suppression of ROS Production in Photosystem I in Response to Electron-Sink Limitations in C3 Plants

Miyake

2020

Antioxidants

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“…This radical is then recycled back to quercetin by oxidation of ascorbate to monodehydroascorbate radical. Data from (Burbulis and Winkel-Shirley, 1999;Saslowsky et al, 2005;Fujino et al, 2018;Khorobrykh et al, 2020). 1 O 2 singlet state of molecular oxygen, HO • hydroxyl radical, H 2 O 2 hydrogen peroxide, and O2 •− superoxide anion radical.…”

Section: Glycosylation Regulates Redox Status During Response To Pathmentioning

confidence: 99%

You Want it Sweeter: How Glycosylation Affects Plant Response to Oxidative Stress

et al. 2020

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Oxidative stress is a cellular threat which puts at risk the productivity of most of crops valorized by humankind in terms of food, feed, biomaterial, or bioenergy. It is therefore of crucial importance to understand the mechanisms by which plants mitigate the deleterious effects of oxidizing agents. Glycosylation of antioxidant molecules and phytohormones modifies their chemical properties as well as their cellular and histological repartition. This review emphasizes the mechanisms and the outcomes of this conjugation reaction on plant ability to face growing conditions favoring oxidative stress, in mirror with the activity of deglycosylating enzymes. Pioneer evidence bridging flavonoid, glycosylation, and redox homeostasis paved the way for numerous functional analyses of UDP-glycosyltransferases (UGTs), such as the identification of their substrates and their role to circumvent oxidative stress resulting from various environmental challenges. (De)glycosylation appears as a simple chemical reaction regulating the biosynthesis and/or the activity of a myriad of specialized metabolites partaking in response to pathogen and abiotic stresses. This outcome underlies the possibility to valorize UGTs potential to upgrade plant adaptation and fitness in a rising context of suboptimal growing conditions subsequent to climate change.

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“…In photosynthesizing leaves, 1 O 2 produced at PSII is mainly detoxified by the actions of carotenoids and tocopherols present in the chloroplast membranes (Triantaphylidès and Havaux 2009). Carotenoids not only via NPQ and direct quenching of 3 Chl decrease the chances of 1 O 2 formation but are also involved in direct quenching of 1 O 2 (Khorobrykh et al 2020). In contrast, O 2…”

Section: Reactive Oxygen Species (Ros) Homeostasis In Photosynthesizimentioning

confidence: 99%

“…•À produced in the chloroplasts by Mehler reaction (Mehler 1951) at PSI is converted into H 2 O 2 by SODs present on the stromal face of the thylakoid membrane, which in turn is detoxified into water and oxygen by the action of ascorbate peroxidase and other components of ascorbate-dependent water-water cycle (Turkan et al 2018;Khorobrykh et al 2020). CATs are considered key for the detoxification of photorespiratory H 2 O 2 produced in peroxisomes (Jithesh et al 2006;Bose et al 2013).…”

Section: Reactive Oxygen Species (Ros) Homeostasis In Photosynthesizimentioning

confidence: 99%

Photosynthetic Adaptations and Oxidative Stress Tolerance in Halophytes from Warm Subtropical Region

Gulzar¹,

Hussain²,

Gul³

et al. 2020

Handbook of Halophytes

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This chapter attempts to synthesize recent work related to photosynthetic adaptations and oxidative stress mitigation mechanisms of perennial warm subtropical halophytes of Karachi, Pakistan. In most species the light-harvesting photochemical reactions appear less sensitive to increase in salinity treatments in comparison with those of carbon fixation. This was evident from unaltered F v /F m values which indicate the maximum photochemical efficiency and the degree of photoinhibition of PSII. However, there was a reduction in electron transport rate (ETR) and a rise in non-photochemical quenching (NPQ) by heat dissipation. Decrease in net photosynthetic rates (P N), stomatal conductance (gs), and transpiration

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Oxygen and ROS in Photosynthesis

Cited by 188 publications

References 444 publications

Molecular Mechanism of Oxidation of P700 and Suppression of ROS Production in Photosystem I in Response to Electron-Sink Limitations in C3 Plants

Molecular Mechanism of Oxidation of P700 and Suppression of ROS Production in Photosystem I in Response to Electron-Sink Limitations in C3 Plants

You Want it Sweeter: How Glycosylation Affects Plant Response to Oxidative Stress

Photosynthetic Adaptations and Oxidative Stress Tolerance in Halophytes from Warm Subtropical Region

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