Version 1
: Received: 4 March 2022 / Approved: 7 March 2022 / Online: 7 March 2022 (14:50:43 CET)
Version 2
: Received: 22 April 2022 / Approved: 26 April 2022 / Online: 26 April 2022 (09:49:53 CEST)
Version 3
: Received: 13 May 2022 / Approved: 16 May 2022 / Online: 16 May 2022 (12:14:30 CEST)
Wieloch, T. High Atmospheric CO 2
Concentration Causes Increased Respiration by the Oxidative Pentose Phosphate Pathway in Chloroplasts. New Phytologist 2022, 235, 1310–1314, doi:10.1111/nph.18226.
Wieloch, T. High Atmospheric CO 2
Concentration Causes Increased Respiration by the Oxidative Pentose Phosphate Pathway in Chloroplasts. New Phytologist 2022, 235, 1310–1314, doi:10.1111/nph.18226.
Wieloch, T. High Atmospheric CO 2
Concentration Causes Increased Respiration by the Oxidative Pentose Phosphate Pathway in Chloroplasts. New Phytologist 2022, 235, 1310–1314, doi:10.1111/nph.18226.
Wieloch, T. High Atmospheric CO 2
Concentration Causes Increased Respiration by the Oxidative Pentose Phosphate Pathway in Chloroplasts. New Phytologist 2022, 235, 1310–1314, doi:10.1111/nph.18226.
Abstract
Despite significant research efforts, the question of whether rising atmospheric CO2 concentrations (Ca) affect leaf respiration remains unanswered. Here, I reanalyse published hydrogen isotope abundances in starch glucose of sunflower leaves. I report that, as Ca increases from 450 to 1500 ppm, respiration by the oxidative pentose phosphate pathway in chloroplasts increases from 0 to ≈ 5% relative to net carbon assimilation. This is consistent with known regulatory properties of the pathway. Summarising recent reports of metabolic fluxes in plant leaves, a picture emerges in which mitochondrial processes are distinctly less important for overall respiration than the oxidative pentose phosphate pathways in chloroplasts and the cytosol. Regulatory properties of these pathways are consistent with observations of lower-than-expected stimulations of photosynthesis in response to increasing Ca. Reported advances in understanding leaf respiratory mechanisms may enable modelling and prediction of respiration effects (inter alia) on biosphere-atmosphere CO2 exchange and plant performance under climate change.
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received:
16 May 2022
Commenter:
Thomas Wieloch
Commenter's Conflict of Interests:
Author
Comment:
- rearranged the title - added key words - moved figures to appropriate places in text - changed line widths in figures 1 and S1 - removed line numbers - minor modification to all parts of the main text and supplement
Commenter: Thomas Wieloch
Commenter's Conflict of Interests: Author
- added key words
- moved figures to appropriate places in text
- changed line widths in figures 1 and S1
- removed line numbers
- minor modification to all parts of the main text and supplement