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

Shu, Sheng; Wang, Yu; Yuan, Ruonan; Guo, Shirong

doi:10.1007/s11120-019-00631-y

Cited by 33 publications

(18 citation statements)

References 62 publications

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“…PQ is located in cytochrome b6f complex (cyt b6f) by which electron transport from PSII to PSI is bridged, and the soluble primary PSI acceptor, Ferredoxin, binds the stromal site of cyt b6f to trigger PSI cyclic electron flow [50]. PSI cyclic electron flow is an important photoprotective pathway in plants under abiotic stress due to the reduction of electron donation to PSI and production of ATP for repairing photodamaged PSII [51][52][53][54]. We supposed that the declined PQ re-oxidation resulted from enhanced binding of cyt b6f with Fd for promoting PSI cyclic electron flow in Glycine soja under salt stress and caused feedback inhibition on electron transport beyond Q A at PSII acceptor side.…”

Section: Discussionmentioning

confidence: 99%

Salt adaptability in a halophytic soybean (Glycine soja) involves photosystems coordination

Bian

et al. 2020

BMC Plant Biol

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Background: Glycine soja is a halophytic soybean native to saline soil in Yellow River Delta, China. Photosystem I (PSI) performance and the interaction between photosystem II (PSII) and PSI remain unclear in Glycine soja under salt stress. This study aimed to explore salt adaptability in Glycine soja in terms of photosystems coordination. Results: Potted Glycine soja was exposed to 300 mM NaCl for 9 days with a cultivated soybean, Glycine max, as control. Under salt stress, the maximal photochemical efficiency of PSII (Fv/Fm) and PSI (△MR/MR 0 ) were significantly decreased with the loss of PSI and PSII reaction center proteins in Glycine max, and greater PSI vulnerability was suggested by earlier decrease in △MR/MR 0 than Fv/Fm and depressed PSI oxidation in modulated 820 nm reflection transients. Inversely, PSI stability was defined in Glycine soja, as △MR/MR 0 and PSI reaction center protein abundance were not affected by salt stress. Consistently, chloroplast ultrastructure and leaf lipid peroxidation were not affected in Glycine soja under salt stress. Inhibition on electron flow at PSII acceptor side helped protect PSI by restricting electron flow to PSI and seemed as a positive response in Glycine soja due to its rapid recovery after salt stress. Reciprocally, PSI stability aided in preventing PSII photoinhibition, as the simulated feedback inhibition by PSI inactivation induced great decrease in Fv/Fm under salt stress. In contrast, PSI inactivation elevated PSII excitation pressure through inhibition on PSII acceptor side and accelerated PSII photoinhibition in Glycine max, according to the positive and negative correlation of △MR/MR 0 with efficiency that an electron moves beyond primary quinone and PSII excitation pressure respectively.Conclusion: Therefore, photosystems coordination depending on PSI stability and rapid response of PSII acceptor side contributed to defending salt-induced oxidative stress on photosynthetic apparatus in Glycine soja. Photosystems interaction should be considered as one of the salt adaptable mechanisms in this halophytic soybean.

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Section: Discussionmentioning

confidence: 99%

Salt adaptability in a halophytic soybean (Glycine soja) involves photosystems coordination

Bian

et al. 2020

BMC Plant Biol

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“…Salt stress, induced by soil salinity, is a growing challenge for agriculture worldwide—approximately 20% of all irrigated agricultural area is affected by soil salinity and this problem continues to worsen. In the interest of reproducibility, many studies on salt stress are conducted with plants grown under constant diurnal light intensity (Wu, Shu, Wang, Yuan, & Guo, 2019; Yang, Lv, Li, Lin, & Xi, 2018). However, plants may perform differently when grown under constant conditions compared with those grown under ever‐changing conditions, including fluctuating light (FL; Poorter et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Salt stress and fluctuating light have separate effects on photosynthetic acclimation, but interactively affect biomass

Zhang

Kaiser

Marcelis

et al. 2020

Plant Cell & Environment

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In nature, soil salinity and fluctuating light (FL) often occur concomitantly. However, it is unknown whether salt stress interacts with FL on leaf photosynthesis, architecture, biochemistry, pigmentation, mineral concentrations, as well as whole-plant biomass. To elucidate this, tomato (Solanum lycopersicum) seedlings were grown under constant light (C, 200 μmol m −2 s −1) or FL (5-650 μmol m −2 s −1), in combination with no (0 mM NaCl) or moderate (80 mM NaCl) salinity, for 14 days, at identical photoperiods and daily light integrals. FL and salt stress had separate effects on leaf anatomy, biochemistry and photosynthetic capacity: FL reduced leaf thickness as well as nitrogen, chlorophyll and carotenoid contents per unit leaf area, but rarely affected steady-state and dynamic photosynthetic properties along with abundance of key proteins in the electron transport chain. Salt stress, meanwhile, mainly disorganized chloroplast grana stacking, reduced stomatal density, size and aperture as well as photosynthetic capacity. Plant biomass was affected interactively by light regime and salt stress: FL reduced biomass in salt stressed plants by 17%, but it did not affect biomass of non-stressed plants. Our results stress the importance of considering FL when inferring effects of salt-stress on photosynthesis and productivity under fluctuating light intensities.

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“…The mitigating effect of Put could be due to its polycationic nature, which induces the electrostatic screening, causes the stacking of thylakoid membrane and increases a spatial segregation of PSII and PSI (Barber, 1982;Ioannidis et al, 2006). In addition, Put can act as a permeant buffer to stimulate the synthesis of ATP, which can be used for PSII recovery after stress (Ioannidis et al, 2006;Ioannidis and Kotzabasis, 2007;Wu et al, 2019). The high value of NPQ indicates that plant has a high photo-protective ability and can protect itself from the damage via dissipation of excessive energy (Shu et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Effects of Exogenous Putrescine on Delaying Senescence of Cut Foliage of Nephrolepis cordifolia

Jiang

Wuyun

et al. 2020

Front. Plant Sci.

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Senescence is the main limitation for cut foliage display in vase. Naturally occurring polyamines such as putrescine (Put) have been considered effective anti-senescence agents. However, effect of Put on cut foliage in vase in a realistic indoor environment has not yet been revealed. In the present study, effects of Put spraying on the postharvest performance of cut foliage of Nephrolepis cordifolia L. were investigated. Cut fronds sprayed with deionized water (Put0) showed visible injuries after 10 days in vase. Meanwhile, chlorophyll (Chl), soluble protein (Sp), and proline (Pro) content were decreased by 60.15, 57.93, and 73.09% respectively, photochemical activity reflected by Chl fluorescence parameters was inhibited, whereas electrolyte leakage (EL), contents of soluble sugar (Ss), malondialdehyde (MDA), and hydrogen peroxide (H 2 O 2) were increased (+194.29, +44.83, +34.06, and +178.01%, respectively). Put spraying extended the vase life of the cut foliage and the 2.0 mM Put had a longer vase life (21 days) than 0.2 mM (15 days). Leaf spraying of 2.0 mM Put for 10 days significantly ameliorated the losses of Chl, Sp, and Pro content (−10.72, −26.29, and −42.64%, respectively), followed by 0.2 mM Put (−27.36, −36.24, and −60.55%, respectively). Put spraying also improved photochemical capability and prevented membrane impairment as well as visible injury in comparison with Put0. In addition, 2.0 mM Put had a better mitigating ability than that of 0.2 mM. Leaf spraying of 2.0 mM Put greatly reduced the decline of the effective quantum yield of photochemical energy conversion in PSII (FPSII), the maximal quantum yield of PSII photochemistry measured in the dark-adapted state (Fv/Fm) and electron transport rate (ETR) (−7.89, −12.91, and −10.06%, respectively), and also inhibited the increases of EL, MDA, Ss, and H 2 O 2 (+31.87, +6.43, +16.22, and +49.40%, respectively). Overall, Put played important roles in deterring the degradation of Chl, Ss, and Pro, detoxifying the H 2 O 2 , weakening the sugar signaling, mitigating the decline of photochemical activity, and eventually postponing the leaf senescence. The present study gives new insights into effects of Put on leaf senescence and provides a strategy for preserving post-harvest cut foliage.

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

Abstract: Highlight: This research describes a novel mechanism of exogenous putrescine regulate cyclic electron flow through ATP generation and ΔpH reduction to protect photosynthetic apparatus in salt-stressed cucumber seedlings.

Cited by 33 publications

References 62 publications

Salt adaptability in a halophytic soybean (Glycine soja) involves photosystems coordination

Salt adaptability in a halophytic soybean (Glycine soja) involves photosystems coordination

Salt stress and fluctuating light have separate effects on photosynthetic acclimation, but interactively affect biomass

Effects of Exogenous Putrescine on Delaying Senescence of Cut Foliage of Nephrolepis cordifolia

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