Revisiting the nonregulatory, constitutive nonphotochemical quenching of the absorbed light energy in oxygenic photosynthetic organisms.

IF 2.1 4区 生物学 Q2 PLANT SCIENCES Photosynthetica Pub Date : 2024-05-27 eCollection Date: 2024-01-01 DOI:10.32615/ps.2024.022
G Garab
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Abstract

The present paper aims to open discussion on the information content, physical mechanism(s), and measuring protocols to determine the partitioning of the absorbed light energy in oxygenic photosynthetic organisms. Revisiting these questions is incited by recent findings discovering that PSII, in addition to its open and closed state, assumes a light-adapted charge-separated state and that chlorophyll a fluorescence induction (ChlF), besides the photochemical activity of PSII, reflects the structural dynamics of its reaction center complex. Thus, the photochemical quantum yield of PSII cannot be determined from the conventional ChlF-based protocol. Consequently, the codependent quantity - the quantum yield of the so-called nonregulatory constitutive nonphotochemical quenching (npq) - loses its physical meaning. Processes beyond photochemistry and regulatory npq should be identified and characterized by multifaceted studies, including ChlF. Such investigations may shed light on the putative roles of dissipation and other energy-consuming events in the stress physiology of photosynthetic machinery.

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本文旨在就确定含氧光合生物体吸收的光能分配的信息内容、物理机制和测量方案展开讨论。最近的研究发现,PSII 除了开放和封闭状态外,还具有与光相适应的电荷分离状态,而叶绿素 a 荧光诱导(ChlF)除了反映 PSII 的光化学活性外,还反映了其反应中心复合物的结构动态。因此,PSII 的光化学量子产率无法通过基于 ChlF 的传统方案来确定。因此,与之相关的量子产率--所谓的非调控构成性非光化学淬灭(npq)量子产率--失去了物理意义。应通过包括 ChlF 在内的多方面研究来确定和描述光化学和调节性非光化学淬灭之外的过程。这些研究可能会揭示耗散和其他耗能事件在光合作用机械应激生理中的潜在作用。
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来源期刊
Photosynthetica
Photosynthetica 生物-植物科学
CiteScore
5.60
自引率
7.40%
发文量
55
审稿时长
3.8 months
期刊介绍: Photosynthetica publishes original scientific papers and brief communications, reviews on specialized topics, book reviews and announcements and reports covering wide range of photosynthesis research or research including photosynthetic parameters of both experimental and theoretical nature and dealing with physiology, biophysics, biochemistry, molecular biology on one side and leaf optics, stress physiology and ecology of photosynthesis on the other side. The language of journal is English (British or American). Papers should not be published or under consideration for publication elsewhere.
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