Induction of cyclic electron flow around photosystem I during heat stress in grape leaves

Sun, Yan; Geng, Qingwei; Du, Yuanpeng; Yang, Xinghong; Zhai, Heng

doi:10.1016/j.plantsci.2016.12.004

Cited by 45 publications

(28 citation statements)

References 62 publications

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“…Recently, it was reported that cyclic electron flow (CEF) which generates a pH gradient (ΔpH) across thylakoid membrane triggers the protective process of NPQ under stress conditions [70] . The CEF around PSI is another mechanism for dissipating excess photon energy [71][72][73][74][75] .…”

Section: High B:r-led Ratios Lead To the Decline In Productivity But mentioning

confidence: 99%

“…Higher ETR values of ice plants grown under higher levels B-LED ( Figure 6b) could be partially due to CEF around PSI that is essential for protecting both PS I and PS II from the damage [73,74,76,77] . Red light alone inhibited electron transport from PS II donor side to PS I in cucumber [51] whereas decreased F v /F m ratio was observed in lettuce exposed to 100% B-LED [36] .…”

Section: High B:r-led Ratios Lead To the Decline In Productivity But mentioning

confidence: 99%

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Impacts of LED spectral quality on leafy vegetables: Productivity closely linked to photosynthetic performance or associated with leaf traits?

He¹,

Qin²,

Chow³

2019

International Journal of Agricultural and Biological Engineering

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The success of growing vegetables indoors requires the most appropriate selection of lighting spectrum. This mini review discusses the impacts of LED spectral quality on different leafy vegetables with a focus on the studies of Chinese broccoli (Brassica alboglabra), ice plants (Mesembryanthem crystallinum) and lettuce (Lactuca sativa L. cv. Canasta). For each species, plants exposed to different spectral LED lights were all under the same light intensity and same photoperiod. Chinese broccoli grown under red(R):blue(B)-LED ratio of 84:16 (16B) had the highest light-saturated photosynthetic CO 2 assimilation rate (A sat ) and stomatal conductance (g s sat ) compared to plants grown under other R:B-LED ratios. It was also shown that 16B is the most appropriate selection for Chinese broccoli to achieve the highest shoot productivity with a rapid leaf number and leaf area development. The highest concentrations of photosynthetic pigments, soluble and Rubisco protein on a leaf area basis were also observed in 16B plants. The results conclusively affirmed that the highest productivity of Chinese broccoli grown under 16B is closely linked to the highest photosynthetic performance on a leaf area basis. For ice plants grown under R:B-LED ratios of 90:10 (10B), they had the highest shoot biomass with a faster leaf development compared to plants grown under other RB-LED combinations. However, there were no differences in A sat , g s sat , photosynthetic pigments, soluble and Rubisco proteins on a leaf area basis. In the case of lettuce plants, it was a surprise to observe that plants grown under 0B and 20G (20% green (G)-LED and 80% R-LED) had the highest shoot biomass, and largest total leaf area and light interception area but the lowest net maximal photosynthetic rate on a leaf area basis, compared to other plants. The combined RB-LED enhanced other photosynthetic parameters while 0B and 20G conditions had inhibitory effects on maximum quantum efficiency of PS II with lower photosynthetic pigments, total soluble protein and Rubisco protein. These results suggest that impacts of LED light quality on productivity of lettuce (L. sativa L. cv. Canasta) are closely linked to leaf traits not associated with photosynthetic performance on a leaf area basis.

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Section: High B:r-led Ratios Lead To the Decline In Productivity But mentioning

confidence: 99%

Section: High B:r-led Ratios Lead To the Decline In Productivity But mentioning

confidence: 99%

Impacts of LED spectral quality on leafy vegetables: Productivity closely linked to photosynthetic performance or associated with leaf traits?

He¹,

Qin²,

Chow³

2019

International Journal of Agricultural and Biological Engineering

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show abstract

“…The excess of ROS is believed to inactivate the thioredoxin‐regulated elongation factor G for D1 proteins, inhibiting the D1 synthesis with loss of PSII activity (Nishiyama et al ). Superoxide and H 2 O 2 react with the electron transfer components in PSI, the Fe‐S cluster, producing hydroxyl radical (Sun et al ). The hydroxyl radical reacts with the amino groups of PSI proteins, primarily PsaA and PsaB, leading to inactivation of PSI (Tikkanen et al ).…”

Section: Introductionmentioning

confidence: 99%

The regulation of P700 is an important photoprotective mechanism to NaCl‐salinity in Jatropha curcas

Cerqueira

Silveira

Carvalho

et al. 2019

Physiologia Plantarum

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Salinity commonly affects photosynthesis and crop production worldwide. Salt stress disrupts the fine balance between photosynthetic electron transport and the Calvin cycle reactions, leading to over‐reduction and excess energy within the thylakoids. The excess energy triggers reactive oxygen species (ROS) overproduction that causes photoinhibition in both photosystems (PS) I and II. However, the role of PSI photoinhibition and its physiological mechanisms for photoprotection have not yet been fully elucidated. In the present study, we analyzed the effects of 15 consecutive days of 100 mM NaCl in Jatropha curcas plants, primarily focusing on the photosynthetic electron flow at PSI level. We found that J. curcas plants have important photoprotective mechanisms to cope with the harmful effects of salinity. We show that maintaining P700 in an oxidized state is an important photoprotector mechanism, avoiding ROS burst in J. curcas exposed to salinity. In addition, upon photoinhibition of PSI, the highly reduced electron transport chain triggers a significant increase in H2O2 content which can lead to the production of hydroxyl radical by Mehler reactions in chloroplast, thereby increasing PSI photoinhibition.

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“…2F; (Horton and Hague, 1988). Generation of qE requires the build-up 429 of trans-membrane Δ pH, which in the chloroplast is mainly induced by electron transport 430 chain (including LEF and CEF) (Aihara et al, 2016;Sun et al, 2017 lumen acidification for a given pmf (Ioannidis et al, 2012). In the present study, we found that 438 stressed leaves showed lower Δ ψ and higher Δ pH compared with the control plants ( Fig.…”

mentioning

confidence: 51%

Exogenous putrescine alleviates photoinhibition caused by salt stress through increasing cyclic electron flow in cucumber

Shu

Wang

et al. 2018

Preprint

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Highlight: This research describes a novel mechanism of exogenous putrescine regulate cyclic 28 electron flow through ATP generation and Δ pH reduction to protect photosynthetic apparatus in 29 salt-stressed cucumber seedlings. 30 Abstract 31 When plants suffer from abiotic stresses, cyclic electron flow (CEF) is induced for 32 photoprotection. Putrescine (Put), a main polyamine in chloroplasts, plays a critical role in 33 stress tolerance. To elucidate the mechanism of Put regulating CEF for salt-tolerance in 34 cucumber leaves, we measured chlorophyll fluorescence, P700 redox state, ATP and NADPH 35 accumulation and so on. The maximum photochemical efficiency of PSII (Fv/Fm) was not 36 influenced by NaCl and/or Put, but the activity of PSI reaction center (P700) was seriously 37 inhibited by NaCl. Salt stress induced high level of CEF, moreover, NaCl and Put treated 38 plants exhibited much higher CEF activity and ATP accumulation than single salt-treated 39 plants to provide adequate ATP/NADPH ratio for plants growth. Furthermore, Put decreased 40 the trans-membrane proton gradient (ΔpH), accompanied by reducing the pH-dependent 41 non-photochemical quenching (qE) and increasing efficient quantum yield of PSII (Y(II)). 42 The ratio of NADP + /NADPH in salt stressed leaves was significantly increased by Put, 43 indicating that Put relieved over-reduction pressure at PSI accepter side. Taken together, our 44 results suggest that exogenous Put enhances CEF to supply extra ATP for PSI recovery and 45 CO 2 assimilation, decreases Δ pH for electron transport related proteins staying active, and 46 enable the non-photochemical quenching transformed into photochemical quenching.47

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Induction of cyclic electron flow around photosystem I during heat stress in grape leaves

Cited by 45 publications

References 62 publications

Impacts of LED spectral quality on leafy vegetables: Productivity closely linked to photosynthetic performance or associated with leaf traits?

Impacts of LED spectral quality on leafy vegetables: Productivity closely linked to photosynthetic performance or associated with leaf traits?

The regulation of P700 is an important photoprotective mechanism to NaCl‐salinity in Jatropha curcas

Exogenous putrescine alleviates photoinhibition caused by salt stress through increasing cyclic electron flow in cucumber

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