@article{Ren:2024:10.1111/nph.19355,
author = {Ren, Y and Wang, H and Harrison, SP and Prentice, IC and Atkin, OK and Smith, NG and Mengoli, G and Stefanski, A and Reich, PB},
doi = {10.1111/nph.19355},
journal = {New Phytologist},
pages = {578--591},
title = {Reduced global plant respiration due to the acclimation of leaf dark respiration coupled to photosynthesis},
url = {http://dx.doi.org/10.1111/nph.19355},
volume = {241},
year = {2024}
}

Download

TY  - JOUR
AB  - Leaf dark respiration (Rd) acclimates to environmental changes. However, the magnitude, controls and time scales of acclimation remain unclear and are inconsistently treated in ecosystem models.    We hypothesized that Rd and Rubisco carboxylation capacity (Vcmax) at 25°C (Rd,25, Vcmax,25) are coordinated so that Rd,25 variations support Vcmax,25 at a level allowing full light use, with Vcmax,25 reflecting daytime conditions (for photosynthesis), and Rd,25/Vcmax,25 reflecting night-time conditions (for starch degradation and sucrose export). We tested this hypothesis temporally using a 5-yr warming experiment, and spatially using an extensive field-measurement data set. We compared the results to three published alternatives: Rd,25 declines linearly with daily average prior temperature; Rd at average prior night temperatures tends towards a constant value; and Rd,25/Vcmax,25 is constant.    Our hypothesis accounted for more variation in observed Rd,25 over time (R2 = 0.74) and space (R2 = 0.68) than the alternatives. Night-time temperature dominated the seasonal time-course of Rd, with an apparent response time scale of c. 2 wk. Vcmax dominated the spatial patterns.    Our acclimation hypothesis results in a smaller increase in global Rd in response to rising CO2 and warming than is projected by the two of three alternative hypotheses, and by current models.
AU  - Ren,Y
AU  - Wang,H
AU  - Harrison,SP
AU  - Prentice,IC
AU  - Atkin,OK
AU  - Smith,NG
AU  - Mengoli,G
AU  - Stefanski,A
AU  - Reich,PB
DO  - 10.1111/nph.19355
EP  - 591
PY  - 2024///
SN  - 0028-646X
SP  - 578
TI  - Reduced global plant respiration due to the acclimation of leaf dark respiration coupled to photosynthesis
T2  - New Phytologist
UR  - http://dx.doi.org/10.1111/nph.19355
UR  - https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.19355
UR  - http://hdl.handle.net/10044/1/107388
VL  - 241
ER  - 

Download