Unified representation of the C3, C4, and CAM photosynthetic pathways with the Photo3 model
Unified representation of the C3, C4, and CAM photosynthetic pathways with the Photo3 model
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DOI：
10.1016/j.ecolmodel.2018.06.012
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发表时间：
2018-09-24
影响因子：
3.1
通讯作者：
Porporato, Amilcare
中科院分区：
文献类型：
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作者：
Hartzell, Samantha;Bartlett, Mark S.;Porporato, Amilcare
最近对景天科酸代谢（CAM）光合作用的兴趣导致了新的生理基础CAM模型。这些模型显示proinise，但通常没有开发与广泛使用的C3和C4光合作用模型兼容的基础。事实上，大多数评估CAM潜力的努力仍然依赖于基于经验的环境生产力指数，这使得CAM和非CAM物种之间的统一比较困难。为了代表C3，C4和CAM光合作用在一个一致的，生理为基础的方式，我们介绍了Photo 3模型。Photo 3将一个共同的光合和水力核心与描绘CAM光合作用的昼夜节律和C4光合作用的碳浓缩机制的组件结合起来。这项工作允许一致的比较三个光合类型的第一次。它还允许通过调整单个模型参数来表示中间C3-CAM行为。模型模拟梨果仙人掌（CAM），两色高粱（C4），小麦（C3）捕捉每个物种的昼夜行为以及长期水分限制的累积效应。这些结果表明，该模型的潜力，C3，C4和CAM光合作用之间的权衡评估，并更好地了解CAM生产力，生态和气候反馈。
Recent interest in crassulacean acid metabolism (CAM) photosynthesis has resulted in new, physiologically based CAM models. These models show proinise, yet typically are not developed with a basis that is compatible with widely used models of C3 and C4 photosynthesis. Indeed, most efforts to assess the potential of CAM still rely on empirically based environmental productivity indices, which makes uniform comparisons between CAM and non-CAM species difficult. In order to represent C3, C4, and CAM photosynthesis in a consistent, physiologically based manner, we introduce the Photo3 model. Photo3 unites a common photosynthetic and hydraulic core with components depicting the circadian rhythm of CAM photosynthesis and the carbon-concentrating mechanism of C4 photosynthesis. This work allows consistent comparisons of the three photosynthetic types for the first time. It also allows the representation of intermediate C3-CAM behavior through the adjustment of a single model parameter. Model simulations of Opuntia ficus-indica (CAM), Sorghum bicolor (C4), and Triticum aestivum (C3) capture the diurnal behavior of each species as well as the cumulative effects of long-term water limitation. These results show the model's potential for evaluating the tradeoffs between C3, C4, and CAM photosynthesis, and for better understanding CAM productivity, ecology, and climate feedbacks.