A generalised dynamic model of leaf-level C3 photosynthesis combining light and dark reactions with stomatal behaviour
A generalised dynamic model of leaf-level C3 photosynthesis combining light and dark reactions with stomatal behaviour
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DOI：
10.1007/s11120-018-0601-1
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发表时间：
2019-07-01
影响因子：
3.7
通讯作者：
Bellasio, Chandra
中科院分区：
文献类型：
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作者：
Bellasio, Chandra
全球粮食需求正在上升，这促使我们制定提高光合作用效率的策略。基于稳态假设的经典光合作用模型本质上不适合评估生物化学和气孔对环境驱动因素快速变化的响应。为了确定提高光合效率的策略，我们需要模型来解释二氧化碳同化对动态环境刺激的反应时间。在此，我提出了一个基于动态过程的C-3叶片光合作用模型。该模型结合了光反应和暗反应，并结合了气孔行为的流体力学模型。该模型获得了稳定、真实的光饱和CO2同化速率和气孔导度。此外，它复制了完整的典型同化响应曲线（不同氧水平下CO2和光强的逐步变化），具有较短的滞后时间和完全的光合驯化。该模型还成功地复制了对光强（光斑）、CO2浓度和大气氧浓度变化的瞬态响应。这种动态模型适合于详细的生态生理学研究，并有可能取代长期占主导地位的稳态方法进行光合作用建模。该模型在Microsoft (R) Excel (R)中作为一个独立的工作簿运行，并且可以免费下载视频教程。
Global food demand is rising, impelling us to develop strategies for improving the efficiency of photosynthesis. Classical photosynthesis models based on steady-state assumptions are inherently unsuitable for assessing biochemical and stomatal responses to rapid variations in environmental drivers. To identify strategies to increase photosynthetic efficiency, we need models that account for the timing of CO2 assimilation responses to dynamic environmental stimuli. Herein, I present a dynamic process-based photosynthetic model for C-3 leaves. The model incorporates both light and dark reactions, coupled with a hydro-mechanical model of stomatal behaviour. The model achieved a stable and realistic rate of light-saturated CO2 assimilation and stomatal conductance. Additionally, it replicated complete typical assimilatory response curves (stepwise change in CO2 and light intensity at different oxygen levels) featuring both short lag times and full photosynthetic acclimation. The model also successfully replicated transient responses to changes in light intensity (light flecks), CO2 concentration, and atmospheric oxygen concentration. This dynamic model is suitable for detailed ecophysiological studies and has potential for superseding the long-dominant steady-state approach to photosynthesis modelling. The model runs as a stand-alone workbook in Microsoft (R) Excel (R) and is freely available to download along with a video tutorial.