Macromolecular rate theory (MMRT) provides a thermodynamics rationale to underpin the convergent temperature response in plant leaf respiration
Liang, Liyin L.
O'Sullivan, Odhran S.
Weerasinghe, Lasantha K.
Egerton, John J. G.
Atkin, Owen K.
Schipper, Louis A.
MetadataShow full item record
KeywordMMRT; Heat; Capacity; Temperature; Response; Thermodynamics; Leaf; Respiration; Climate; Change; Arrhenius
Temperature is a crucial factor in determining the rates of ecosystem processes, e.g. leaf respiration (R) − the flux of plant respired CO2 from leaves to the atmosphere. Generally, R increases exponentially with temperature and formulations such as the Arrhenius equation are widely used in earth system models. However, experimental observations have shown a consequential and consistent departure from an exponential increase in R. What are the principles that underlie these observed patterns? Here, we demonstrate that macromolecular rate theory (MMRT), based on transition state theory for enzyme-catalyzed kinetics, provides a thermodynamic explanation for the observed departure and the convergent temperature response of R using a global database. Three meaningful parameters emerge from MMRT analysis: the temperature at which the rate of respiration would theoretically reach a maximum (the optimum temperature, Topt), the temperature at which the respiration rate is most sensitive to changes in temperature (the inflection temperature, Tinf) and the overall curvature of the log(rate) versus temperature plot (the change in heat capacity for the system, ∆Cp‡). On average the highest potential enzyme-catalyzed rates of respiratory enzymes for R is predicted to occur at 67.0±1.2 °C and the maximum temperature sensitivity at 41.4±0.7 °C from MMRT. The average curvature (average negative ∆Cp‡) was -1.2±0.1 kJ.mol-1K-1. Interestingly, Topt, Tinf and ∆Cp‡ appear insignificantly different across biomes and plant functional types (PFTs), suggesting that thermal response of respiratory enzymes in leaves could be conserved. The derived parameters from MMRT can serve as thermal traits for plant leaves that represents the collective temperature response of metabolic respiratory enzymes and could be useful to understand regulations of R under a warmer climate. MMRT extends the classic transition state theory to enzyme-catalyzed reactions and provides an accurate and mechanistic model for the short-term temperature response of R around the globe.
Author Posting. © The Author(s), 2017. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Global Change Biology 24 (2018):1538-1547, doi:10.1111/gcb.13936.
Suggested CitationPreprint: Liang, Liyin L., Arcus, Vickery, Heskel, Mary, O'Sullivan, Odhran S., Weerasinghe, Lasantha K., Creek, Danielle, Egerton, John J. G., Tjoelker, Mark, Atkin, Owen K., Schipper, Louis A., "Macromolecular rate theory (MMRT) provides a thermodynamics rationale to underpin the convergent temperature response in plant leaf respiration", 2017-10, https://doi.org/10.1111/gcb.13936, https://hdl.handle.net/1912/9327
Showing items related by title, author, creator and subject.
Extreme rainfall and snowfall alter responses of soil respiration to nitrogen fertilization : a 3-year field experiment Chen, Zengming; Xu, Yehong; Zhou, Xuhui; Tang, Jianwu; Kuzyakov, Yakov; Yu, Hongyan; Fan, Jianling; Ding, Weixin (2016-12)Extreme precipitation is predicted to be more frequent and intense accompanying global warming, and may have profound impacts on soil respiration (Rs) and its components, i.e., autotrophic (Ra) and heterotrophic (Rh) ...
Effect of growth temperature on photosynthetic capacity and respiration in three ecotypes of Eriophorum vaginatum Schedlbauer, Jessica L.; Fetcher, Ned; Hood, Katherine; Moody, Michael M.; Tang, Jianwu (John Wiley & Sons, 2018-03-06)Ecotypic differentiation in the tussock‐forming sedge Eriophorum vaginatum has led to the development of populations that are locally adapted to climate in Alaska's moist tussock tundra. As a foundation species, E. vaginatum ...
Bradford, Mark A.; Davies, Christian A.; Frey, Serita D.; Maddox, Thomas R.; Melillo, Jerry M.; Mohan, Jacqueline E.; Reynolds, James F.; Treseder, Kathleen K.; Wallenstein, Matthew D. (2008-07-22)In the short-term heterotrophic soil respiration is strongly and positively related to temperature. In the long-term its response to temperature is uncertain. One reason for this is because in field experiments increases ...