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Title: No evidence for triose phosphate limitation of light saturated leaf photosynthesis under current atmospheric CO 2 concentration

Abstract

The triose phosphate utilization rate ( TPU) has been identified as one of the processes that can limit terrestrial plant photosynthesis. However, we lack a robust quantitative assessment of TPU limitation of photosynthesis at the global scale. As a result, TPU, and its potential limitation of photosynthesis, is poorly represented in terrestrial biosphere models (TBMs). In this study, we utilised a global dataset of photosynthetic CO 2 response curves representing 141 species from tropical rainforests to Arctic tundra. Here, we quantified TPU by fitting the standard biochemical model of C 3 photosynthesis to measured photosynthetic CO 2 response curves, and characterised its instantaneous temperature response. Our results demonstrate that TPU does not limit leaf photosynthesis at the current ambient atmospheric CO 2 concentration. Furthermore, our results showed that the light saturated photosynthetic rates of plants growing in cold environments are not more often limited by TPU than those of plants growing in warmer environments. In addition, our study showed that the instantaneous temperature response of TPU is distinct from temperature response of the maximum rate of Rubisco carboxylation. The new formulations of the temperature response of TPU derived in this study may prove useful in quantifying the biochemical limits tomore » terrestrial plant photosynthesis and improve the representation of plant photosynthesis in TBM.« less

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [2]
  1. Western Sydney Univ., Penrith (Australia); Coconut Research Institute of Sri Lanka, Lunuwila (Sri Lanka)
  2. Western Sydney Univ., Penrith (Australia)
  3. Western Sydney Univ., Penrith (Australia); State Univ. of New York, Syracuse, NY (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1557708
Report Number(s):
BNL-211939-2019-JAAM
Journal ID: ISSN 0140-7791
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Plant, Cell and Environment
Additional Journal Information:
Journal Name: Plant, Cell and Environment; Journal ID: ISSN 0140-7791
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; terrestrial biosphere models; C3 photosynthesis; ACi curves; temperature; maximum carboxylation capacity; potential electron transport rate

Citation Formats

Kumarathunge, Dushan P., Medlyn, Belinda E., Drake, John E., Rogers, Alistair, and Tjoelker, Mark G. No evidence for triose phosphate limitation of light saturated leaf photosynthesis under current atmospheric CO2 concentration. United States: N. p., 2019. Web. doi:10.1111/pce.13639.
Kumarathunge, Dushan P., Medlyn, Belinda E., Drake, John E., Rogers, Alistair, & Tjoelker, Mark G. No evidence for triose phosphate limitation of light saturated leaf photosynthesis under current atmospheric CO2 concentration. United States. doi:10.1111/pce.13639.
Kumarathunge, Dushan P., Medlyn, Belinda E., Drake, John E., Rogers, Alistair, and Tjoelker, Mark G. Sun . "No evidence for triose phosphate limitation of light saturated leaf photosynthesis under current atmospheric CO2 concentration". United States. doi:10.1111/pce.13639.
@article{osti_1557708,
title = {No evidence for triose phosphate limitation of light saturated leaf photosynthesis under current atmospheric CO2 concentration},
author = {Kumarathunge, Dushan P. and Medlyn, Belinda E. and Drake, John E. and Rogers, Alistair and Tjoelker, Mark G.},
abstractNote = {The triose phosphate utilization rate (TPU) has been identified as one of the processes that can limit terrestrial plant photosynthesis. However, we lack a robust quantitative assessment of TPU limitation of photosynthesis at the global scale. As a result, TPU, and its potential limitation of photosynthesis, is poorly represented in terrestrial biosphere models (TBMs). In this study, we utilised a global dataset of photosynthetic CO2 response curves representing 141 species from tropical rainforests to Arctic tundra. Here, we quantified TPU by fitting the standard biochemical model of C3 photosynthesis to measured photosynthetic CO2 response curves, and characterised its instantaneous temperature response. Our results demonstrate that TPU does not limit leaf photosynthesis at the current ambient atmospheric CO2 concentration. Furthermore, our results showed that the light saturated photosynthetic rates of plants growing in cold environments are not more often limited by TPU than those of plants growing in warmer environments. In addition, our study showed that the instantaneous temperature response of TPU is distinct from temperature response of the maximum rate of Rubisco carboxylation. The new formulations of the temperature response of TPU derived in this study may prove useful in quantifying the biochemical limits to terrestrial plant photosynthesis and improve the representation of plant photosynthesis in TBM.},
doi = {10.1111/pce.13639},
journal = {Plant, Cell and Environment},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {8}
}

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This content will become publicly available on August 4, 2020
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