Acclimation Unifies the Scaling of Carbon Assimilation Across Climate Gradients and Levels of Organisation DOI Creative Commons
Josef C. Garen, Sean T. Michaletz

Ecology Letters, Год журнала: 2024, Номер 27(10)

Опубликована: Окт. 1, 2024

ABSTRACT The temperature dependence of carbon assimilation—from leaf photosynthesis to ecosystem productivity—is hypothesised be driven by the kinetics Rubisco‐catalysed carboxylation and electron transport. However, photosynthetic physiology acclimates changes in temperature, which may decouple dependencies at higher levels organisation from acute sensitivity photosynthesis. Here, we integrate relative growth rate theory, metabolic theory biochemical develop a budget model plant that accounts for acclimation temperature. We test its predictions using novel experimental approach enabling concurrent measurement photosynthesis, acclimated rate. demonstrate first time mediates how assimilation ‘scale up’ whole‐plant growth. also find existing models are unable predict features responses our system.

Язык: Английский

Hotter is not (always) better: Embracing unimodal scaling of biological rates with temperature DOI
Sean T. Michaletz, Josef C. Garen

Ecology Letters, Год журнала: 2024, Номер 27(2)

Опубликована: Фев. 1, 2024

Rate-temperature scaling relationships have fascinated biologists for nearly two centuries and are increasingly important in our era of global climate change. These hypothesized to originate from the temperature-dependent kinetics rate-limiting biochemical reactions metabolism. Several prominent theories formalized this hypothesis using Arrhenius model, which characterizes a monotonic temperature dependence an activation energy E. However, ubiquitous unimodal nature biological responses presents theoretical, methodological, conceptual challenges that restrict promise insight, prediction, progress. Here we review development key hypotheses methods temperature-scaling rates. Using simulations, examine constraints models, illustrating their sensitivity data nuances such as range noise, tendency yield variable underestimated E, with critical consequences change predictions. We also evaluate behaviour models when applied incomplete noisy datasets. conclude recommendations resolving these future research, advocate shift better characterize full responses.

Язык: Английский

Процитировано

8
Estimating CO2 response in a mixed broadleaf forest using the dynamic assimilation technique DOI Creative Commons
Huiting Hu, Wei Jiang,

Xiuhua Fan

и другие.

BMC Plant Biology, Год журнала: 2025, Номер 25(1)

Опубликована: Янв. 21, 2025

Estimating the CO2 response of forest trees is great significance in plant photosynthesis research. measurement traditionally employed under steady state conditions. With development open-path gas exchange systems, Dynamic Assimilation Technique (DAT), allows non-steady This greatly improves efficiency and data density measurement. study aims to assess accuracy effectiveness different models fitting DAT data, addressing current gap verification model performance. research was conducted for three common broadleaf tree species (Ulmus macrocarpa, Fraxinus mandshurica, Tilia amurensis) North Eastern China. Among species, mandshurica most adapted high concentration Four were compared, rectangular hyperbola (RH) model, Michaelis-Menten (MM) modified (MRH) a non-rectangular (NRH) model. Considering parsimony parameter accuracy, NRH emerged as best choice (R2 = 0.9966, RMSE 0.1862, AIC=-199.86). provides reference further application field photosynthesis.

Язык: Английский

Процитировано

0
Estimating CO2 Response in a Mixed Broadleaf Forest using the Dynamic Assimilation Technique DOI
Huiting Hu, Wei Jiang,

Xiuhua Fan

и другие.

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Июль 15, 2024

Abstract Background Estimating the CO2 response of forest trees is great significance in plant photosynthesis research. measurement traditionally employed under steady state conditions. With development open-path gas exchange systems, Dynamic Assimilation Technique (DAT), allows non-steady This greatly improves efficiency and data density measurement. However, effects different models fitting DAT have not been extensively verified. Results research was conducted for three common broadleaf tree species (Ulmus macrocarpa, Fraxinus mandshurica, Tilia amurensis) North Eastern China. Among species, Fraxinus mandshurica most adapted to high concentration Four were compared, rectangular hyperbola (RH) model, Michaelis-Menten (MM) modified (MRH) model a non-rectangular (NRH) model. Conclusions Considering parsimony parameter accuracy, NRH emerged as best choice (R2 = 0.9966, RMSE 0.1862, AIC=-199.86). study provides reference further application field photosynthesis.

Язык: Английский

Процитировано

0
Acclimation Unifies the Scaling of Carbon Assimilation Across Climate Gradients and Levels of Organisation DOI Creative Commons
Josef C. Garen, Sean T. Michaletz

Ecology Letters, Год журнала: 2024, Номер 27(10)

Опубликована: Окт. 1, 2024

ABSTRACT The temperature dependence of carbon assimilation—from leaf photosynthesis to ecosystem productivity—is hypothesised be driven by the kinetics Rubisco‐catalysed carboxylation and electron transport. However, photosynthetic physiology acclimates changes in temperature, which may decouple dependencies at higher levels organisation from acute sensitivity photosynthesis. Here, we integrate relative growth rate theory, metabolic theory biochemical develop a budget model plant that accounts for acclimation temperature. We test its predictions using novel experimental approach enabling concurrent measurement photosynthesis, acclimated rate. demonstrate first time mediates how assimilation ‘scale up’ whole‐plant growth. also find existing models are unable predict features responses our system.

Язык: Английский

Процитировано

0