Photoacclimation of Light Harvesting Systems in Eukaryotic Algae
Photoacclimation of Light Harvesting Systems in Eukaryotic Algae
复制标题
真核藻类光捕获系统的光驯化
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
Yi‐Bu Chen
中科院分区：
文献类型：
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作者：
P. Falkowski;Yi‐Bu Chen
光适应是一组表型表达的、发育独立的、可逆的生理反馈反应，对光谱辐射的短期变化(几分钟到几天)做出反应。这些反应在所有真核藻类中都能观察到，涉及到光吸收截面、有效吸收截面以及从水到末端受体(如二氧化碳或硝酸盐)的电子转移速率的变化。在这一章中，我们回顾了水生生态系统中为光适应反应提供选择压力的主要物理过程。这些过程包括云穿过天空、垂直混合和入射太阳辐照度的日变化。对光谱辐射变化的生理反应是通过系统间电子传递组分的氧化还原状态来传递的，尤其是质醌。在“嵌套”系列中，响应包括状态转换、叶黄素的改变以及捕光复合体的净合成/降解。这三个过程具有不同的时间常数和动态范围，但都会导致光化学的有效吸收截面发生变化，从而使光吸收和电子传输达到平衡。光吸收和电子传输之间的平衡优化(而不是最大化)在自然水生生态系统中发现的非常广泛的光条件下的光合作用。
Photoacclimation is a suite of phenotypically expressed, developmentally independent, reversible physiological feedback responses to short-term (minutes to days) variations in spectral irradiance. These responses are observed in all eukaryotic algal taxa and involve alterations in the optical absorption cross section, the effective absorption cross section, and the rate of electron transfer from water to a terminal acceptor (e.g., carbon dioxide or nitrate). In this chapter, we review the primary physical processes in aquatic ecosystems that provided selection pressure for photoacclimation responses. These processes include the passage of clouds across the sky, vertical mixing, and diel variability in incident solar irradiance. The physiological responses to variations in the spectral irradiance are transduced via the redox state of intersystem electron transport components, especially plastoquinone. In a ‘nested’ series, responses include state transitions, alterations in the xanthophylls, and net synthesis/degradation of light harvesting complexes. The three processes have different time constants and dynamic ranges, but all result in alterations of the effective absorption cross section of photochemistry, such that light absorption and electron transport are balanced. The balance between light absorption and electron transport optimizes (not maximizes) photosynthesis under a very wide range of light conditions found in natural aquatic ecosystems.
DOI：
10.1016/s0005-2728(89)80166-5
发表时间：
1989-04-17
期刊：
BIOCHIMICA ET BIOPHYSICA ACTA
影响因子：
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作者：
BRUCE, D;BRIMBLE, S;BRYANT, DA
通讯作者：
BRYANT, DA