Moderate Photoinhibition of Photosystem II Protects Photosystem I from Photodamage at Chilling Stress in Tobacco Leaves

Huang, Wei; Yang, Yingjie; Hong, Hu; Zhang, Shi‐Bao

doi:10.3389/fpls.2016.00182

Cited by 39 publications

(38 citation statements)

References 57 publications

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“…As occurred in our experiment, PSI in Appulo E was more inhibited under control growth conditions than in Dada. During control growth conditions the high activity of PSII in Appulo E led to a rather higher electron flow to PSI, causing probably the formation of ROS within PSI complex [ 67 , 68 ], which induced a higher PSI excitation pressure in Appulo E than in Dada ( Table 2 ) that presented a lower PSII photochemistry ( Figure 2 a) and lower PSI excitation pressure ( Table 2 ). This higher PSI photoinhibition in Appulo E than in Dada under control growth conditions was alleviated by the absence of PSII photoinhibition in Appulo E as indicated by the F v / F m value ( Figure 5 ).…”

Section: Discussionmentioning

confidence: 99%

Photosystem II Is More Sensitive than Photosystem I to Al3+ Induced Phytotoxicity

Moustaka

Ouzounidou²,

Sperdouli

et al. 2018

Materials

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Aluminium (Al) the most abundant metal in the earth’s crust is toxic in acid soils (pH < 5.5) mainly in the ionic form of Al3+ species. The ability of crops to overcome Al toxicity varies among crop species and cultivars. Here, we report for a first time the simultaneous responses of photosystem II (PSII) and photosystem I (PSI) to Al3+ phytotoxicity. The responses of PSII and PSI in the durum wheat (Triticum turgidum L. cv. ‘Appulo E’) and the triticale (X Triticosecale Witmark cv. ‘Dada’) were evaluated by chlorophyll fluorescence quenching analysis and reflection spectroscopy respectively, under control (−Al, pH 6.5) and 148 μM Al (+Al, pH 4.5) conditions. During control growth conditions the high activity of PSII in ‘Appulo E’ led to a rather higher electron flow to PSI, which induced a higher PSI excitation pressure in ‘Appulo E’ than in ‘Dada’ that presented a lower PSII activity. However, under 148 μM Al the triticale ‘Dada’ presented a lower PSII and PSI excitation pressure than ‘Appulo E’. In conclusion, both photosystems of ‘Dada’ displayed a superior performance than ‘Appulo E’ under Al exposure, while in both cultivars PSII was more affected than PSI from Al3+ phytotoxicity.

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Section: Discussionmentioning

confidence: 99%

Photosystem II Is More Sensitive than Photosystem I to Al3+ Induced Phytotoxicity

Moustaka

Ouzounidou²,

Sperdouli

et al. 2018

Materials

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“…Net PSII photoinhibition occurs only when the rate of PSII photodamage exceeds the rate of recovery. At chilling temperature, the linear electron flow was largely inhibited (Huang et al 2011(Huang et al , 2016aYang et al 2018), resulting in inhibition of ATP synthesis (Huang et al 2017). Consequently, the ATP-dependent fast de novo synthesis of D1 protein was largely inhibited at chilling temperature (Allakhverdiev and Murata 2004).…”

Section: Introductionmentioning

confidence: 99%

Special issue in honour of Prof. Reto J. Strasser - Photoinhibition of oxygen-evolving complex and photosystem II at chilling stress in the tropical tree species Dalbergia odorifera

Yang¹,

Liu²,

Zhang³

et al. 2020

Photosynt.

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Photosystem II is sensitive to chilling stress in tropical tree species. However, the underlying mechanism is not clear. In this study, we examined the effects of chilling and light stress on activities of PSII and oxygen-evolving complex (OEC), in order to resolve the controversy of whether chilling-induced PSII photoinhibition is attributed to the excess-energy model or the two-step scheme. We determined changes in chlorophyll a fluorescence transient and energy distribution in PSII during treatment at chilling-light stress for the tropical tree species Dalbergia odorifera. At chilling temperature, the lightuse efficiency was largely inhibited. During chilling treatment, the maximum quantum yield of PSII gradually decreased. Meanwhile, the relative fluorescence intensity at K-step (300 μs) significantly increased, indicating the photodamage to OEC. A tightly positive correlation was found between photodamage to OEC and PSII photoinhibition, suggesting that photodamage to OEC was a rate-limiting step for PSII photoinhibition. Furthermore, additional generation of reactive oxygen species did not aggravate PSII photoinhibition at chilling temperature. These results suggest that two-step model is responsible for chilling-induced PSII photoinhibition in the tropical tree species D. odorifera.

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“…In addition to CEF, electron transfer from PSII (ETRII) plays an important role in affecting the redox state of PSI ( Tikkanen et al, 2014 ; Huang et al, 2016a , c ; Suorsa et al, 2016 ). In pgr5 plants of A. thaliana , severe photoinhibition of PSII is likely to function as the ultimate control of photosynthetic electron transfer allowing the maintenance of P700 optimally oxidized under excess light ( Tikkanen et al, 2014 ).…”

Section: Introductionmentioning

confidence: 99%

Cyclic Electron Flow around Photosystem I Promotes ATP Synthesis Possibly Helping the Rapid Repair of Photodamaged Photosystem II at Low Light

et al. 2018

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In higher plants, moderate photoinhibition of photosystem II (PSII) leads to a stimulation of cyclic electron flow (CEF) at low light, which is accompanied by an increase in the P700 oxidation ratio. However, the specific role of CEF stimulation at low light is not well known. Furthermore, the mechanism underlying this increase in P700 oxidation ratio at low light is unclear. To address these questions, intact leaves of the shade-adapted plant Panax notoginseng were treated at 2258 μmol photons m-2 s-1 for 30 min to induce PSII photoinhibition. Before and after this high-light treatment, PSI and PSII activity, the energy quenching in PSII, the redox state of PSI and proton motive force (pmf) at a low light of 54 μmol photons m-2 s-1 were determined at the steady state. After high-light treatment, electron flow through PSII (ETRII) significantly decreased but CEF was remarkably stimulated. The P700 oxidation ratio significantly increased but non-photochemical quenching changed negligibly. Concomitantly, the total pmf decreased significantly and the proton gradient (ΔpH) across the thylakoid membrane remained stable. Furthermore, the P700 oxidation ratio was negatively correlated with the value of ETRII. These results suggest that upon PSII photoinhibition, CEF is stimulated to increase the ATP synthesis, facilitating the rapid repair of photodamaged PSII. The increase in P700 oxidation ratio at low light cannot be explained by the change in pmf, but is primarily controlled by electron transfer from PSII.

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Moderate Photoinhibition of Photosystem II Protects Photosystem I from Photodamage at Chilling Stress in Tobacco Leaves

Cited by 39 publications

References 57 publications

Photosystem II Is More Sensitive than Photosystem I to Al3+ Induced Phytotoxicity

Photosystem II Is More Sensitive than Photosystem I to Al3+ Induced Phytotoxicity

Special issue in honour of Prof. Reto J. Strasser - Photoinhibition of oxygen-evolving complex and photosystem II at chilling stress in the tropical tree species Dalbergia odorifera

Cyclic Electron Flow around Photosystem I Promotes ATP Synthesis Possibly Helping the Rapid Repair of Photodamaged Photosystem II at Low Light

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