A minimal mathematical model of nonphotochemical quenching of chlorophyll fluorescence
A minimal mathematical model of nonphotochemical quenching of chlorophyll fluorescence
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DOI：
10.1016/j.biosystems.2010.10.011
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发表时间：
2011-02-01
期刊：
影响因子：
1.6
通讯作者：
Tirok, Katrin
中科院分区：
文献类型：
--
作者：
Ebenhoeh, Oliver;Houwaart, Torsten;Tirok, Katrin
在自然条件下，植物暴露在快速变化的光照强度下。为了适应这种波动，植物进化了适应机制，以最佳方式利用可用光能，同时将过量光对光合作用装置的损害降至最低。一个重要的机制是多余的激发能以热的形式耗散，这可以被测量为叶绿素荧光(NPQ)的非光化学猝灭。在这篇文章中，我们提出了一个高度简化的数学模型，它捕捉到了短期自适应淬火动力学的基本实验观察特征。我们研究了模型的静态和动态行为，并系统地分析了特征系统性质对关键参数如速率常数和池大小的依赖关系。通过比较模拟和实验数据，我们可以得出关于简化假设的有效性的结论，并进一步提出关于叶黄素循环在NPQ中的作用的假设。我们设想，目前提出的光反应与短期适应过程相结合的理论描述将为开发更详细的机制模型奠定基础，通过这些模型可以从理论上研究NPQ的分子机制。(C)2010爱思唯尔爱尔兰有限公司。保留所有权利。
Under natural conditions, plants are exposed to rapidly changing light intensities. To acclimate to such fluctuations, plants have evolved adaptive mechanisms that optimally exploit available light energy and simultaneously minimise damage of the photosynthetic apparatus through excess light. An important mechanism is the dissipation of excess excitation energy as heat which can be measured as nonphotochemical quenching of chlorophyll fluorescence (NPQ). In this paper, we present a highly simplified mathematical model that captures essential experimentally observed features of the short term adaptive quenching dynamics. We investigate the stationary and dynamic behaviour of the model and systematically analyse the dependence of characteristic system properties on key parameters such as rate constants and pool sizes. Comparing simulations with experimental data allows to derive conclusions about the validity of the simplifying assumptions and we further propose hypotheses regarding the role of the xanthophyll cycle in NPQ. We envisage that the presented theoretical description of the light reactions in conjunction with short term adaptive processes serves as a basis for the development of more detailed mechanistic models by which the molecular mechanisms of NPQ can be theoretically studied. (C) 2010 Elsevier Ireland Ltd. All rights reserved.