Novel effects of methyl viologen on photosystem II function in spinach leaves

Fan, Dayong; Jia, Husen; Barber, James; Chow, Wah Soon

doi:10.1007/s00249-009-0484-3

Cited by 28 publications

(19 citation statements)

References 16 publications

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“…Fan et al . found that low MV concentrations decreased the chlorophyll‐ a fluorescence yield corresponding to dark‐adapted reaction centers ( F 0 ) and closed reaction centers ( F m ) and also diminished the light‐adapted photochemical efficiency of PSII. Our results with MV on F. benjamina , H. helix and S. wallisi agreed with the previous study published by Fan et al .…”

Section: Discussionmentioning

confidence: 98%

“…Several authors have already studied changes in the yield of chlorophyll fluorescence in the presence of herbicides . Conrad et al .…”

Section: Introductionmentioning

confidence: 99%

“…Fan et al . reported a study of the mechanism of action of MV on the electron flow through PSII in spinach‐leaf disks . They suggested that the presence of this herbicide accelerated several electron‐transfer steps in PSII.…”

Section: Introductionmentioning

confidence: 99%

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Atrazine and Methyl Viologen Effects on Chlorophyll‐a Fluorescence Revisited—Implications in Photosystems Emission and Ecotoxicity Assessment

Iriel

Novo

Cordon

et al. 2013

Photochem & Photobiology

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In this work, we use the effect of herbicides that affect the photosynthetic chain at defined sites in the photosynthetic reaction steps to derive information about the fluorescence emission of photosystems. The interpretation of spectral data from treated and control plants, after correction for light reabsorption processes, allowed us to elucidate current controversies in the subject. Results were compatible with the fact that a nonnegligible Photosystem I contribution to chlorophyll fluorescence in plants at room temperature does exist. In another aspect, variable and nonvariable chlorophyll fluorescence were comparatively tested as bioindicators for detection of both herbicides in aquatic environment. Both methodologies were appropriate tools for this purpose. However, they showed better sensitivity for pollutants disconnecting Photosystem II-Photosystem I by blocking the electron transport between them as Atrazine. Specifically, changes in the (experimental and corrected by light reabsorption) red to far red fluorescence ratio, in the maximum photochemical quantum yield and in the quantum efficiency of Photosytem II for increasing concentrations of herbicides have been measured and compared. The most sensitive bioindicator for both herbicides was the quantum efficiency of Photosystem II.

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Section: Discussionmentioning

confidence: 98%

“…Several authors have already studied changes in the yield of chlorophyll fluorescence in the presence of herbicides . Conrad et al .…”

Section: Introductionmentioning

confidence: 99%

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Atrazine and Methyl Viologen Effects on Chlorophyll‐a Fluorescence Revisited—Implications in Photosystems Emission and Ecotoxicity Assessment

Iriel

Novo

Cordon

et al. 2013

Photochem & Photobiology

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“…S1; Bendall and Manasse, 1995;Joliot and Joliot, 2002). By reacting with any electrons coming from PSI, MV inhibits CEF and diverts LEF (Yu et al, 1993;Herbert et al, 1995) toward ROS production (Jia et al, 2008;Fan et al, 2009). In the presence of MV, the ROS production in a cell is thus mostly dependent upon the absolute number of electrons passing through PSI complexes per time unit, which results from two parameters that are both strongly influenced by growth irradiance: the electron transport rate at PSI complexes and the number of PSI complexes per cell.…”

Section: Identification Of Functional Groups Responding To Oxidative mentioning

confidence: 99%

Light History Influences the Response of the Marine CyanobacteriumSynechococcussp. WH7803 to Oxidative Stress

et al. 2011

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Marine Synechococcus undergo a wide range of environmental stressors, especially high and variable irradiance, which may induce oxidative stress through the generation of reactive oxygen species (ROS). While light and ROS could act synergistically on the impairment of photosynthesis, inducing photodamage and inhibiting photosystem II repair, acclimation to high irradiance is also thought to confer resistance to other stressors. To identify the respective roles of light and ROS in the photoinhibition process and detect a possible light-driven tolerance to oxidative stress, we compared the photophysiological and transcriptomic responses of Synechococcus sp. WH7803 acclimated to low light (LL) or high light (HL) to oxidative stress, induced by hydrogen peroxide (H 2 O 2 ) or methylviologen. While photosynthetic activity was much more affected in HL than in LL cells, only HL cells were able to recover growth and photosynthesis after the addition of 25 mM H 2 O 2 . Depending upon light conditions and H 2 O 2 concentration, the latter oxidizing agent induced photosystem II inactivation through both direct damage to the reaction centers and inhibition of its repair cycle. Although the global transcriptome response appeared similar in LL and HL cells, some processes were specifically induced in HL cells that seemingly helped them withstand oxidative stress, including enhancement of photoprotection and ROS detoxification, repair of ROS-driven damage, and regulation of redox state. Detection of putative LexA binding sites allowed the identification of the putative LexA regulon, which was downregulated in HL compared with LL cells but up-regulated by oxidative stress under both growth irradiances.

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“…Recent studies (e.g. Fan et al 2009) report negative effects on PS II, effective quantum yield in particular. In algae, however, MV effects on PS II / PS I are much less studied.…”

Section: Introductionmentioning

confidence: 99%

Effects of controlled oxidative stress and uncouplers on primary photosynthetic processes in vegetative cells of Antarctic alga Zygnema sp.

Kakkou¹,

Barták²,

Hájek³

et al. 2016

Czech Polar Rep.

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In our study, we present responses of Antarctic strain of filamentous alga Zygnema sp. collected at James Ross Island (Antarctica) to application of variuos uncouplers of primary photosynthetic processes. We exposed the alga to different concentrations of nigericin, 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), dithiothreitol (DTT), methyl viologen (MV) and hydrogen peroxide (H 2 O 2 ) in order to test stability of photosystem II, involvement of non-photochemical quenching, and PS II functioning under combination of moderate light with particular uncoupler. Oxidative stress tolerance was tested by the combination of hydrogen peroxide (H 2 O 2 ) and moderate light. Time courses of F V /F M ,  PSII , NPQ and qF 0 were investigated and particular effects of the above-specified chemicals discussed. Moderate doses of uncouplers allowing partial recovery, and the doses causing full inhibition of PS II were specified.

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Novel effects of methyl viologen on photosystem II function in spinach leaves

Cited by 28 publications

References 16 publications

Atrazine and Methyl Viologen Effects on Chlorophyll‐a Fluorescence Revisited—Implications in Photosystems Emission and Ecotoxicity Assessment

Atrazine and Methyl Viologen Effects on Chlorophyll‐a Fluorescence Revisited—Implications in Photosystems Emission and Ecotoxicity Assessment

Light History Influences the Response of the Marine CyanobacteriumSynechococcussp. WH7803 to Oxidative Stress

Effects of controlled oxidative stress and uncouplers on primary photosynthetic processes in vegetative cells of Antarctic alga Zygnema sp.

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