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Acclimation of leaf respiration temperature responses across thermally contrasting biomes

Abstract : Short-term temperature response curves of leaf dark respiration (R-T) provide insights into a critical process that influences plant net carbon exchange. This includes how respiratory traits acclimate to sustained changes in the environment. Our study analysed 860 high-resolutionR-T(10-70 degrees C range) curves for: (a) 62 evergreen species measured in two contrasting seasons across several field sites/biomes; and (b) 21 species (subset of those sampled in the field) grown in glasshouses at 20 degrees C : 15 degrees C, 25 degrees C : 20 degrees C and 30 degrees C : 25 degrees C, day : night. In the field, across all sites/seasons, variations inR(25)(measured at 25 degrees C) and the leafTwhereRreached its maximum (T-max) were explained by growthT(mean air-Tof 30-d before measurement), solar irradiance and vapour pressure deficit, with growthThaving the strongest influence.R(25)decreased andT(max)increased with rising growthTacross all sites and seasons with the single exception of winter at the cool-temperate rainforest site where irradiance was low. The glasshouse study confirmed thatR(25)andT(max)thermally acclimated. Collectively, the results suggest: (1) thermal acclimation of leafRis common in most biomes; and (2) the highTthreshold of respiration dynamically adjusts upward when plants are challenged with warmer and hotter climates.
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Contributor : Dominique Tiziani <>
Submitted on : Wednesday, December 9, 2020 - 3:38:59 PM
Last modification on : Tuesday, February 23, 2021 - 3:18:04 PM

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Lingling Zhu, Keith Bloomfield, Shinichi Asao, Mark Tjoelker, John J.G. Egerton, et al.. Acclimation of leaf respiration temperature responses across thermally contrasting biomes. New Phytologist, Wiley, 2020, pp.1-14. ⟨10.1111/nph.16929⟩. ⟨hal-03048840⟩



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