Regulation of Electron Transport in Chloroplasts: Induction Processes in Tradescantia Leaves

IF 4.033 Q4 Biochemistry, Genetics and Molecular Biology

Biophysics Pub Date : 2025-08-22 DOI:10.1134/S0006350925700290

I. S. Suslichenko, B. V. Trubitsin, A. N. Tikhonov

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Abstract

The results of a comparative study of electron transport in chloroplasts in situ in the leaves of shade-tolerant and light-loving tradescantia species (T. fluminensis and T. sillamontana) grown under conditions of strong (800−1000 μmole m^–2 s^–1of photons) or weak (moderate) illumination (50−125 μmole m^–2 s^–1of photons) are described. Electron transport processes were monitored using the methods of electron paramagnetic resonance and optical spectroscopy. The photoinduced redox transformations of the primary electron donor of photosystem I (P₇₀₀) and the slow induction of chlorophyll a fluorescence were studied. It has been shown that plants acclimated to high light intensity are characterized by faster processes of P₇₀₀ oxidation and chlorophyll a fluorescence attenuation compared to plants grown at low light intensity. The data obtained are analyzed in the context of “short-term” mechanisms of pH-dependent regulation of electron transport in intact chloroplasts (non-photochemical quenching of excitation in photosystem II, slowing down the oxidation of plastoquinol by cytochrome b₆f complex, and activation of Calvin−Benson cycle reactions).

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叶绿体中电子传递的调控：龙葵叶片的诱导过程

本文描述了在强光照（800 ~ 1000 μmol m-2 s - 1光子）和弱光照（50 ~ 125 μmol m-2 s - 1光子）条件下生长的耐荫和喜爱光的tradescantia物种（T. fluminensis和T. sillamontana）叶片叶绿体原位电子传递的比较研究结果。利用电子顺磁共振和光谱学方法对电子输运过程进行了监测。研究了光系统I （P700）初级电子供体的光诱导氧化还原转化和叶绿素a荧光的缓慢诱导。研究表明，与生长在低光强下的植物相比，适应高光强的植物的P700氧化和叶绿素a荧光衰减过程更快。获得的数据在完整叶绿体中ph依赖的电子传输调节的“短期”机制（光系统II中激发的非光化学猝灭，细胞色素b6f复合物对plasoquinol的氧化减慢，以及Calvin - Benson循环反应的激活）的背景下进行了分析。

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来源期刊

Biophysics Biochemistry, Genetics and Molecular Biology-Biophysics

CiteScore

1.20

自引率

0.00%

发文量

期刊介绍： Biophysics is a multidisciplinary international peer reviewed journal that covers a wide scope of problems related to the main physical mechanisms of processes taking place at different organization levels in biosystems. It includes structure and dynamics of macromolecules, cells and tissues; the influence of environment; energy transformation and transfer; thermodynamics; biological motility; population dynamics and cell differentiation modeling; biomechanics and tissue rheology; nonlinear phenomena, mathematical and cybernetics modeling of complex systems; and computational biology. The journal publishes short communications devoted and review articles.