Exogenous trehalose protects photosystem II by promoting cyclic electron flow under heat and drought stresses in winter wheat

Luo, Yin; Xie, Yanyang; He, Dalin; Wang, Wenqiang; Yuan, Suifang

doi:10.1111/plb.13277

Cited by 21 publications

(8 citation statements)

References 36 publications

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“…This indicated that trehalose pretreatment could protect the protein secondary structures of PSII reaction center complex, which was similar to a previous report involving spray dried poly-L-lysine (Mauerer & Lee 2006). The protective effect of trehalose on the PSII reaction center complex may be due to the stimulation of circulating electron flow (Luo et al 2021).…”

Section: O N L I N E F I R S Tsupporting

confidence: 89%

Exogenous trehalose protects photosystem II in heat-stressed wheat

et al. 2022

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Background: Photosystem II (PSII) is susceptible to heat stress. Plants naturally accumulate trehalose to improve stress tolerance. However, the mechanism by which trehalose affects PSII during heat stress is still unknown. Questions: How does trehalose affect PSII during heat stress? Studied species: Triticum aestivum L. Study site and dates: Shanghai, China. 2019-2021. Methods: Trehalose -pretreated wheat seedlings suffered from heat stress and their photosynthetic parameters were measured. Results: Heat stress caused a reduction in the photochemical efficiency of PSII, the electron transfer rate (ETR(II)), the quantum yield of regulated energy dissipationY(NPQ) and the coefficient of photochemical quenching (qP), but increased the quantum yield of non-regulated energy dissipation of PSII (Y[NO]). The shape of the fast chlorophyll fluorescence induction kinetics (OJIP) curve in the heat-stressed wheat was altered and the primary photochemistry maximum yield of PSII (Fv/Fo) and the PSII performance indicator PIabs were reduced. Accordingly, the activities of PSII and electron transport chain, the amount of ordered α-helix structures and the content of D1 protein also decreased. However, in trehalose-pretreated wheat, D1 protein and protein secondary structures of PSII were both protected, the electron transport activities of PSII and the whole chain were improved and greater fluorescence parameters values were maintained. Lower Y(NO) and more stable OJIP were obtained. Conclusions: Exogenous trehalose acted a vital role in the protection of the function of PSII, resulting in higherphotosynthetic capacity under heat stress.

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Section: O N L I N E F I R S Tsupporting

confidence: 89%

Exogenous trehalose protects photosystem II in heat-stressed wheat

et al. 2022

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“…Excessive light energy can, under stress conditions, contribute to ROS production within chloroplasts that can damage both PSII and PSI. CEF-PSI can effectively protect against photodamage, and many prior reports have demonstrated that CEF can shield PSI from stressors including cold [ 67 ], heat [ 68 ], drought [ 69 ], and other adverse conditions [ 70 ]. By oxidizing PSI acceptor-side components through the recycling of electrons from PSI to the plastoquinone (PQ) pool and Cyt b6/f, CEF can mitigate acceptor-side reduction [ 71 ].…”

Section: Discussionmentioning

confidence: 99%

The Protective Effect of Exogenous Ascorbic Acid on Photosystem Inhibition of Tomato Seedlings Induced by Salt Stress

Chen

Han

Cong

et al. 2023

Plants

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This study investigated the protective effects of exogenous ascorbic acid (AsA, 0.5 mmol·L−1) treatment on salt-induced photosystem inhibition in tomato seedlings under salt stress (NaCl, 100 mmol·L−1) conditions with and without the AsA inhibitor lycorine. Salt stress reduced the activities of photosystem II (PSII) and PSI. AsA treatment mitigated inhibition of the maximal photochemical efficiency of PSII (Fv/Fm), maximal P700 changes (Pm), the effective quantum yields of PSII and I [Y(II) and Y(I)], and non-photochemical quenching coefficient (NPQ) values under salt stress conditions both with and without lycorine. Moreover, AsA restored the balance of excitation energy between two photosystems (β/α-1) after disruption by salt stress, with or without lycorine. Treatment of the leaves of salt-stressed plants with AsA with or without lycorine increased the proportion of electron flux for photosynthetic carbon reduction [Je(PCR)] while decreasing the O2-dependent alternative electron flux [Ja(O2-dependent)]. AsA with or without lycorine further resulted in increases in the quantum yield of cyclic electron flow (CEF) around PSI [Y(CEF)] while increasing the expression of antioxidant and AsA–GSH cycle-related genes and elevating the ratio of reduced glutathione/oxidized glutathione (GSH/GSSG). Similarly, AsA treatment significantly decreased the levels of reactive oxygen species [superoxide anion (O2−) and hydrogen peroxide (H2O2)] in these plants. Together, these data indicate that AsA can alleviate salt-stress-induced inhibition of PSII and PSI in tomato seedlings by restoring the excitation energy balance between the photosystems, regulating the dissipation of excess light energy by CEF and NPQ, increasing photosynthetic electron flux, and enhancing the scavenging of reactive oxygen species, thereby enabling plants to better tolerate salt stress.

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“…The P700 signal was determined during single-turn saturation pulse [ST, 50 ms, plastoquinone (PQ) pools being oxidized] followed by multiple-turn saturation pulse (MT, 50 ms, PQ pools fully reduced) in the presence of far-red background light ( Savitch et al, 2001 ; Luo et al, 2021 ). The complementary area between the P700 oxidation curve after a single-turnover and multiple-turnover excitations and the stationary level of P700 + under far-red light represents the single-turn and multiple-turn areas, respectively.…”

Section: Methodsmentioning

confidence: 99%

Responses of Linear and Cyclic Electron Flow to Nitrogen Stress in an N-Sensitive Species Panax notoginseng

Zhang

Shuang

et al. 2022

Front. Plant Sci.

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Nitrogen (N) is a primary factor limiting leaf photosynthesis. However, the mechanism of N-stress-driven photoinhibition of the photosystem I (PSI) and photosystem II (PSII) is still unclear in the N-sensitive species such as Panax notoginseng, and thus the role of electron transport in PSII and PSI photoinhibition needs to be further understood. We comparatively analyzed photosystem activity, photosynthetic rate, excitation energy distribution, electron transport, OJIP kinetic curve, P700 dark reduction, and antioxidant enzyme activities in low N (LN), moderate N (MN), and high N (HN) leaves treated with linear electron flow (LEF) inhibitor [3-(3,4-dichlorophenyl)-1,1-dimethyl urea (DCMU)] and cyclic electron flow (CEF) inhibitor (methyl viologen, MV). The results showed that the increased application of N fertilizer significantly enhance leaf N contents and specific leaf N (SLN). Net photosynthetic rate (Pn) was lower in HN and LN plants than in MN ones. Maximum photochemistry efficiency of PSII (Fv/Fm), maximum photo-oxidation P700+ (Pm), electron transport rate of PSI (ETRI), electron transport rate of PSII (ETRII), and plastoquinone (PQ) pool size were lower in the LN plants. More importantly, K phase and CEF were higher in the LN plants. Additionally, there was not a significant difference in the activity of antioxidant enzyme between the MV- and H2O-treated plants. The results obtained suggest that the lower LEF leads to the hindrance of the formation of ΔpH and ATP in LN plants, thereby damaging the donor side of the PSII oxygen-evolving complex (OEC). The over-reduction of PSI acceptor side is the main cause of PSI photoinhibition under LN condition. Higher CEF and antioxidant enzyme activity not only protected PSI from photodamage but also slowed down the damage rate of PSII in P. notoginseng grown under LN.

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Exogenous trehalose protects photosystem II by promoting cyclic electron flow under heat and drought stresses in winter wheat

Cited by 21 publications

References 36 publications

Exogenous trehalose protects photosystem II in heat-stressed wheat

Exogenous trehalose protects photosystem II in heat-stressed wheat

The Protective Effect of Exogenous Ascorbic Acid on Photosystem Inhibition of Tomato Seedlings Induced by Salt Stress

Responses of Linear and Cyclic Electron Flow to Nitrogen Stress in an N-Sensitive Species Panax notoginseng

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