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Journals / Turkish Journal of Forest Science / 2026 / Cilt: 10 Sayı: 1

Photorespiratory flux in C3 plants: A meta-analysis of FvCB model fits to published A-Cc and A-PAR data across crop and forest species

C3 bitkilerinde fotorespirasyon akışı: Yayınlanmış A-Cc ve A-PAR verisine FvCB modelinin uyumunun tarım ve orman türlerinde meta analizi

Emre Yazar(Fen Bilimleri Enstitüsü)0000-0003-0249-0798
Pages
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Publication Date
2026-08-20
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

These results validate the FvCB framework across a taxonomically diverse C3 species set and provide a consolidated parameterization for canopy-scale and Earth system modelling.

📌 3 Key Takeaways

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Objective & Hypothesis:Photorespiration constrains net carbon gain in C3 plants by competing with carboxylation at the active site of ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO).
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Key Findings & Data:Quantifying this flux requires kinetic models that accurately describe the CO2 and light dependence of assimilation across diverse species and temperatures.
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Conclusion & Impact:These results validate the FvCB framework across a taxonomically diverse C3 species set and provide a consolidated parameterization for canopy-scale and Earth system modelling.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Fotorespiratuar karbon kaybı · Rubisco kinetiği · gaz değişim modelleri

Abstract

Photorespiration constrains net carbon gain in C3 plants by competing with carboxylation at the active site of ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO). Quantifying this flux requires kinetic models that accurately describe the CO2 and light dependence of assimilation across diverse species and temperatures. Here I perform a meta-analysis of published A-Cc and A-PAR curves from eleven species-temperature combinations spanning six crop species - Nicotiana tabacum, Glycine max, Triticum aestivum, Arabidopsis thaliana, Helianthus annuus and Gossypium hirsutum ̶ and three temperate forest tree species ̶ European beech (Fagus sylvatica L.), pedunculate oak (Quercus robur L.), and silver birch (Betula pendula Roth) ̶ over a temperature range of 22-35°C. I fit the Farquhar-von Caemmerer-Berry (FvCB) model to each dataset using nonlinear least-squares optimization with Bernacchi temperature-response functions and extract maximum carboxylation rates (Vcmax), maximum electron transport rates (Jmax), day respiration (Rd), and CO2 compensation points (Γ*). Fitted Vcmax ranged from 137.5 to 244.4 µmol m⁻² s⁻¹ across all species, with forest species spanning the upper half of the range (178.6-244.4 µmol m⁻² s⁻¹) and silver birch showing the highest Vcmax of any species in the dataset, consistent with published reports for temperate broadleaf trees. Model fits were excellent across all A-Cc curves (R² = 0.957-0.994, RMSE = 0.65-2.44 µmol m⁻² s⁻¹) and satisfactory for A-PAR curves (R² = 0.80-0.97). Photorespiratory CO2 release (Rp) at pre-industrial CO2 (Cc ≈ 280 µbar) accounted for 18-26% of gross assimilation, and 14-21% at current ambient CO2 (Cc ≈ 420 µbar), with no systematic difference between crop and forest species at the same temperature, confirming that the Γ*/CcTo our knowledge, this is the first meta-analysis to apply a single, consistently parameterized FvCB framework to both crop and temperate forest tree species and to compare their photorespiratory flux on a common basis. Ratio rather than species identity is the primary determinant of photorespiratory fraction. These results validate the FvCB framework across a taxonomically diverse C3 species set and provide a consolidated parameterization for canopy-scale and Earth system modelling.

Özet

Fotorespirasyon, ribuloz-1,5-bisfosfat karboksilaz/oksijenazın (RuBisCO) aktif bölgesinde karboksilasyon ile rekabet ederek C3 bitkilerinde net karbon kazanımını sınırlar. Bu akının nicel olarak belirlenmesi, farklı türler ve sıcaklıklar boyunca asimilasyonun CO₂ ve ışığa bağlılığını doğru şekilde tanımlayan kinetik modeller gerektirir. Burada, 22-35°C sıcaklık aralığında altı tarım bitkisi türü ̶ Nicotiana tabacum, Glycine max, Triticum aestivum, Arabidopsis thaliana, Helianthus annuus ve Gossypium hirsutum ̶ ile üç ılıman orman ağacı türünü ̶ Avrupa kayını (Fagus sylvatica L.), saplı meşe (Quercus robur L.) ve gümüş huş (Betula pendula Roth) ̶ kapsayan on bir tür-sıcaklık kombinasyonuna ait yayımlanmış A-Cc ve A-PAR eğrilerinin meta-analizi gerçekleştirilmiştir. Her veri setine, Bernacchi sıcaklık-tepki fonksiyonları kullanılarak doğrusal olmayan en küçük kareler optimizasyonu ile Farquhar-von Caemmerer-Berry modeli (FvCB) modeli uydurulmuş ve maksimum karboksilasyon hızları (Vcmax), maksimum elektron taşınım hızları (Jmax), gündüz solunumu (Rd) ve CO₂ denge noktaları (Γ*) elde edilmiştir. Uyumlanan Vcmax değerleri tüm türler arasında 137.5 ile 244.4 µmol m⁻² s⁻¹ arasında değişmiş, orman ağaçları orta aralıkta (178.6-244.4 µmol m⁻² s⁻¹) yer almıştır. Bu sonuçlar ılıman geniş yapraklı ağaçlar için yayımlanmış verilerle tutarlıdır. Model uyumları tüm A-Cc eğrileri için mükemmel (R² = 0.957-0.994, RMSE = 0.65-2.44 µmol m⁻² s⁻¹) ve A-PAR eğrileri için tatmin edici (R² = 0.80-0.97) bulunmuştur. Güncel ortam CO₂ düzeyinde (Cc ≈ 420 µbar), fotorespiratuvar CO₂ salımı (Rp) brüt asimilasyonun %14-21’ini oluşturmuş, aynı sıcaklıkta tarım ve orman türleri arasında sistematik bir fark gözlenmemiştir. Bu durum, fotorespirasyon oranının belirlenmesinde tür kimliğinden ziyade Γ*/Cc oranının temel belirleyici olduğunu doğrulamaktadır. Bu sonuçlar, FvCB çerçevesinin taksonomik olarak çeşitli C3 türleri boyunca geçerliliğini doğrulamakta ve örtü (kanopi) ölçekli ile Dünya sistemi modellemeleri için bütünleşik bir parametre seti sunmaktadır.

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Cite This Article

Yazar, E. (2026). Photorespiratory flux in C3 plants: A meta-analysis of FvCB model fits to published A-Cc and A-PAR data across crop and forest species. Turkish Journal of Forest Science, Cilt: 10 Sayı: 1. https://doi.org/10.32328/turkjforsci.1943941

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