Development of Two-Dimensional Model of Photosynthesis in Plant Leaves and Analysis of Induction of Spatial Heterogeneity of CO 2 Assimilation Rate under Action of Excess Light and Drought.

Abstract

Photosynthesis is a key process in plants that can be strongly affected by the actions of environmental stressors. The stressor-induced photosynthetic responses are based on numerous and interacted processes that can restrict their experimental investigation. The development of mathematical models of photosynthetic processes is an important way of investigating these responses. Our work was devoted to the development of a two-dimensional model of photosynthesis in plant leaves that was based on the Farquhar-von Caemmerer-Berry model of CO 2 assimilation and descriptions of other processes including the stomatal and transmembrane CO 2 fluxes, lateral CO 2 and HCO 3 - fluxes, transmembrane and lateral transport of H + and K + , interaction of these ions with buffers in the apoplast and cytoplasm, light-dependent regulation of H + -ATPase in the plasma membrane, etc. Verification of the model showed that the simulated light dependences of the CO 2 assimilation rate were similar to the experimental ones and dependences of the CO 2 assimilation rate of an average leaf CO 2 conductance were also similar to the experimental dependences. An analysis of the model showed that a spatial heterogeneity of the CO 2 assimilation rate on a leaf surface should be stimulated under an increase in light intensity and a decrease in the stomatal CO 2 conductance or quantity of the open stomata; this prediction was supported by the experimental verification. Results of the work can be the basis of the development of new methods of the remote sensing of the influence of abiotic stressors (at least, excess light and drought) on plants.

Plant phenotyping relevance

葉面CO2同化速度の空間分布を推定する二次元数理モデルを開発し、実験データで検証しているため、植物生理状態の取得・推定手法が研究の中心です。

Code and data availability

植物フェノタイピング解析を再現する公開資産であることを、入力本文と直接リンクから確認できなかったため保留しました。

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