Yang Xiao-Long, An Ting, Ye Zi-Wu-Yin, Kang Hua-Jing, Robakowski Piotr, Ye Zi-Piao, Wang Fu-Biao, Zhou Shuang-Xi
School of Life Sciences, Nantong University, Nantong, China.
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
Front Plant Sci. 2025 Mar 6;16:1478346. doi: 10.3389/fpls.2025.1478346. eCollection 2025.
Effective quantum efficiency of photosystem II (Φ) represents the proportion of photons of incident light that are actually used for photochemical processes, which is a key determinant of crop photosynthetic efficiency and productivity. A robust model that can accurately reproduce the nonlinear light response of Φ (Φ-) over the I range from zero to high irradiance levels is lacking. In this study, we tested a Φ- model based on the fundamental properties of light absorption and transfer of energy to the reaction centers via photosynthetic pigment molecules. Using a modeling-observation intercomparison approach, the performance of our model versus three widely used empirical Φ- models were compared against observations for two C crops (peanut and cotton) and two cultivars of a C crop (sweet sorghum). The results highlighted the significance of our model in (1) its accurate and simultaneous reproduction of light response of both Φ and the photosynthetic electron transport rate () over a wide I range from light limited to photoinhibition levels and (2) accurately returning key parameters defining the light response curves.
光系统II的有效量子效率（Φ）代表了入射光中实际用于光化学过程的光子比例，这是作物光合效率和生产力的关键决定因素。目前缺乏一个能够在从零到高辐照度水平的I范围内准确再现Φ（Φ-）的非线性光响应的稳健模型。在本研究中，我们测试了一个基于光吸收以及通过光合色素分子将能量传递到反应中心的基本特性的Φ-模型。使用建模-观测相互比较的方法，将我们模型的性能与三个广泛使用的经验性Φ-模型进行比较，并与两种C4作物（花生和棉花）以及一种C3作物（甜高粱）的两个品种的观测结果进行对比。结果突出了我们模型的重要性，体现在：（1）在从光限制到光抑制水平的较宽I范围内，能够准确且同时再现Φ和光合电子传递速率（）的光响应；（2）准确回归定义光响应曲线的关键参数。
