Limitations of the Farquhar-von Caemmerer-Berry Model in Estimating the Maximum Electron Transport Rate: Evidence from Four C 3 Species.

Abstract

The study evaluates the accuracy of two FvCB model sub-models (I and II) in estimating the maximum electron transport rate for CO 2 assimilation ( J A-max ) by comparing estimated values with observed maximum electron transport rates ( J f-max ) in four C 3 species: Triticum aestivum L., Silphium perfoliatum L., Lolium perenne L., and Trifolium pratense L. Significant discrepancies were found between J A-max estimates from sub-model I and observed J f-max values for T. aestivum , S. perfoliatum , and T. pratense ( p J A-max for T. aestivum . Sub-model II consistently produced higher J A-max estimates than sub-model I. This study highlights limitations in the FvCB sub-models, particularly their tendency to overestimate J A-max when accounting for electron consumption by photorespiration ( J O ), nitrate reduction ( J Nit ), and the Mehler reaction ( J MAP ). An alternative empirical model provided more accurate J f-max estimates, suggesting the need for improved approaches to model photosynthetic electron transport. These findings have important implications for crop yield prediction, ecological modeling, and climate change adaptation strategies, emphasizing the need for more accurate estimation methods in plant physiology research.

Plant phenotyping relevance

植物の最大電子伝達速度という生理形質について、FvCBモデルの推定精度を観測値と比較検証し、代替モデルも評価しているため、方法検証が研究の中心である。

Code and data availability

The paper's gas-exchange/fluorescence measurements (An–Ci, J–Ci curves for four C3 species) are not deposited in any public dataset; the Data Availability Statement only points to Supplementary Table S1 (Rd and Γ* parameters). The PMSS web platform (photosynthetic.sinaapp.com) is a generic third-party modeling tool, an

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