Effects of Mg2+on spectral characteristics and photosynthetic functions of spinach photosystem II

Chen, Liang; Xiao, Wu; Huang, Hao; Liu, Xiaoqing; Liu, Chao; Zheng, Lei; Hong, Fashui

doi:10.1016/j.saa.2008.10.012

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…It is evident that the initial oxygen generation was much larger in the HS+ buffer compared to the HS buffer, with the lowest light fluxes (16% and 26%) showing a 5–6-fold difference in the peak oxygen current. This is consistent with the enhanced photosynthetic activity that has been reported on bulk systems in the presence of the Mg 2+ ions, ,, and could also be due to the presence of chloride ions or Mn 2+ , which play a crucial role in the water splitting complex. ,, …”

Section: Resultssupporting

confidence: 88%

“…It is evident that the initial oxygen generation was much larger in the HS+ buffer compared to the HS buffer, with the lowest light fluxes (16% and 26%) showing a 5−6-fold difference in the peak oxygen current. This is consistent with the enhanced photosynthetic activity that has been reported on bulk systems in the presence of the Mg 2+ ions, 56,59,78 and could also be due to the presence of chloride ions or Mn 2+ , which play a crucial role in the water splitting complex. 57,79,80 Using the FEM model described earlier, the rate of oxygen evolution over the initial forty seconds of illumination at the chloroplast film, for both HS and HS+ buffers, was calculated.…”

Section: ■ Theory and Simulationssupporting

confidence: 90%

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Quantitative Local Photosynthetic Flux Measurements at Isolated Chloroplasts and Thylakoid Membranes Using Scanning Electrochemical Microscopy (SECM)

et al. 2013

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Quantitative local photosynthetic flux measurements at isolated chloroplasts and thylakoid membranes using scanning electrochemical microscopy (SECM). Copies of full items can be used for personal research or study, educational, or not-forprofit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Publisher's statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry Part B, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/jp403048fThe version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. (CN) 6 4-), from the artificial electron acceptor ferricyanide (Fe(CN) 6 3-), using a stationary ultramicroelectrode at chloroplasts and thylakoid membranes (sourced from chloroplasts). Oxygen generation at films of chloroplasts and thylakoid membranes was detected directly during photosynthesis, but in the case of thylakoid membranes this switched to sustained oxygen consumption at longer illumination times. An initial oxygen concentration spike was detected over both chloroplast and thylakoid membrane films, and the kinetics of the oxygen generation were extracted by fitting the experimental data to a finite element method (FEM) simulation. In contrast to previous work, the oxygen generation spike was attributed to the limited size of the plastoquinone pool, a key component in the linear electron transport pathway and a contributing factor in photoinhibition. Finally, the mobile nature of the SECM probe, and its high spatial resolution, also allowed us to detect ferrocyanide produced from a single thylakoid membrane. These results further demonstrate the power of SECM for localized flux measurements in biological processes, in this case photosynthesis, and, that the high time resolution, combined with FEM simulations, allows the elucidation of quantitative kinetic information.

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Section: Resultssupporting

confidence: 88%

Section: ■ Theory and Simulationssupporting

confidence: 90%

Quantitative Local Photosynthetic Flux Measurements at Isolated Chloroplasts and Thylakoid Membranes Using Scanning Electrochemical Microscopy (SECM)

et al. 2013

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“…This result might be accounted for Chl a molecules which were already present in the cells of A. platensis. The highest PSII activity, which was found at 0.8 mM Mg 2+ , proved that this concentration of Mg 2+ might improve PSII conformation and promote energy transfer and water splitting (Liang et al, 2009). In the presence of 1.6 mM Mg 2+ , the PSII activities were detected as 28.2 U and 31.8 µmol DCIP mg −1 chl h −1 on the 8 th and 10 th day, respectively.…”

Section: Discussionmentioning

confidence: 92%

Untitled

Ürek¹,

Kerimoglu²

2019

Turk. J. Fish. Aquat. Sci.

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The aim of this study was to investigate the effects of Mg 2+ (0 -4 mM), and Cu 2+ (0 -5 µM) concentrations on biomass and photosynthetic pigment-metabolites, and photosystem II activity in Arthrospira platensis Gomont 1892. The highest biomass was determined on control condition including both Mg 2+ (0.8 mM) and Cu 2+ (0.5 µM) as 49.1±1.6 mg mL -1 . Although the levels of phycocyanin, allophycocyanin and chlorophyll a were varied due to Mg 2+ concentration, phycocyanin and allophycocyanin were the major fractions. The highest chlorophyll a level was detected at 0.5 µM Cu 2+ . The major carotenoid was β-carotene, and its highest value was determined in the absence of Cu 2+ as 2400±60 µg mL -1 . In addition, excessive and insufficient amounts of Mg 2+ and Cu 2+ caused a decrease in photosystem II activities of A. platensis. This work provides a good example for the production of carotenoids for use in various industries, such as food, cosmetic and pharmaceutical products.

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“…Mg depletion was found to affect the activity of rubisco, which results in the reduction of the photosynthesis rate ( Figure 2) [25,30,33]. In several plant species, decreases in photosynthetic capacity and net CO 2 assimilation have been noticed [17,24,25,[33][34][35][36][37]. Moreover, the structure and the partial photochemical activities of PSI, PSII, and F v /F m ratio (greatest quantum efficiency of PSII) were also found to be affected by Mg deficiency [17,35,38].…”

Section: Photosynthetic Activitymentioning

confidence: 93%

Current Understandings on Magnesium Deficiency and Future Outlooks for Sustainable Agriculture

Chaudhry

Nayab

Hussain

et al. 2021

IJMS

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The productivity of agricultural produce is fairly dependent on the availability of nutrients and efficient use. Magnesium (Mg2+) is an essential macronutrient of living cells and is the second most prevalent free divalent cation in plants. Mg2+ plays a role in several physiological processes that support plant growth and development. However, it has been largely forgotten in fertilization management strategies to increase crop production, which leads to severe reductions in plant growth and yield. In this review, we discuss how the Mg2+ shortage induces several responses in plants at different levels: morphological, physiological, biochemical and molecular. Additionally, the Mg2+ uptake and transport mechanisms in different cellular organelles and the role of Mg2+ transporters in regulating Mg2+ homeostasis are also discussed. Overall, in this review, we critically summarize the available information about the responses of Mg deficiency on plant growth and development, which would facilitate plant scientists to create Mg2+-deficiency-resilient crops through agronomic and genetic biofortification.

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Effects of Mg2+on spectral characteristics and photosynthetic functions of spinach photosystem II

Cited by 9 publications

References 6 publications

Quantitative Local Photosynthetic Flux Measurements at Isolated Chloroplasts and Thylakoid Membranes Using Scanning Electrochemical Microscopy (SECM)

Quantitative Local Photosynthetic Flux Measurements at Isolated Chloroplasts and Thylakoid Membranes Using Scanning Electrochemical Microscopy (SECM)

Untitled

Current Understandings on Magnesium Deficiency and Future Outlooks for Sustainable Agriculture

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