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<p>The results of an <i>in situ</i> (leaves) study of electron transport in chloroplasts of two plant species of the genus <i>Cucumis</i>, the shade-tolerant species <i>C. sativus</i> (cucumber) and a light-loving species <i>C. melo</i> (melon) grown under conditions of strong (800–1000 μmoles m<sup>–2</sup> s<sup>–1</sup> of photons) and moderate (50–125&#xa0;μmoles m<sup>–2</sup>s<sup>–1</sup> of photons) illumination are described. The processes of electron transport were monitored by the electron paramagnetic resonance (EPR) signal from <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11439_2025_9888_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="30" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{P}}_{{{\text{700}}}}^{ + }\)</EquationSource> <!--BioPhys2570007Marinin-m1--> </InlineEquation> (the oxidized reaction center of photosystem 1), by light absorption (the difference signal <i>A</i><sub>870–830</sub> from <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11439_2025_9888_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="30" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{P}}_{{{\text{700}}}}^{ + }\)</EquationSource> <!--BioPhys2570007Marinin-m2--> </InlineEquation>), and by the fluorescence yield of chlorophyll <i>a</i>. It has been shown that plants grown at high light intensity are characterized by faster changes in the redox state of Р<sub>700</sub> compared to plants grown at low (moderate) light intensity. The data obtained are discussed in the context of the mechanisms of regulation of electron transport in chloroplasts of shade-tolerant and light-loving plant species of the genus <i>Cucumis</i>.</p>

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Regulation of Electron Transport in Chloroplasts: Induction Processes in the Leaves of the Genus Cucumis

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • N. A. Marinin,
  • I. S. Suslichenko,
  • A. N. Tikhonov

摘要

The results of an in situ (leaves) study of electron transport in chloroplasts of two plant species of the genus Cucumis, the shade-tolerant species C. sativus (cucumber) and a light-loving species C. melo (melon) grown under conditions of strong (800–1000 μmoles m–2 s–1 of photons) and moderate (50–125 μmoles m–2s–1 of photons) illumination are described. The processes of electron transport were monitored by the electron paramagnetic resonance (EPR) signal from \({\text{P}}_{{{\text{700}}}}^{ + }\) (the oxidized reaction center of photosystem 1), by light absorption (the difference signal A870–830 from \({\text{P}}_{{{\text{700}}}}^{ + }\) ), and by the fluorescence yield of chlorophyll a. It has been shown that plants grown at high light intensity are characterized by faster changes in the redox state of Р700 compared to plants grown at low (moderate) light intensity. The data obtained are discussed in the context of the mechanisms of regulation of electron transport in chloroplasts of shade-tolerant and light-loving plant species of the genus Cucumis.