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Title: Isotopically nonstationary 13C flux analysis of changes in Arabidopsis thaliana leaf metabolism due to high light acclimation

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [2];  [1]
  1. U.S. Dept. of Agriculture, St. Louis, MO (United States)
  2. Vanderbilt Univ., Nashville, TN (United States)

Improving plant productivity is an important aim for metabolic engineering. There are few comprehensive methods that quantitatively describe leaf metabolism, although such information would be valuable for increasing photosynthetic capacity, enhancing biomass production, and rerouting carbon flux toward desirable end products. Isotopically nonstationary metabolic flux analysis (INST-MFA) has been previously applied to map carbon fluxes in photoautotrophic bacteria, which involves model-based regression of transient 13C-labeling patterns of intracellular metabolites. However, experimental and computational difficulties have hindered its application to terrestrial plant systems. Here, we performed in vivo isotopic labeling of Arabidopsis thaliana rosettes with 13CO2 and estimated fluxes throughout leaf photosynthetic metabolism by INST-MFA. Plants grown at 200 µmol m$$-$$2s$$-$$1 light were compared with plants acclimated for 9 d at an irradiance of 500 µmol∙m$$-$$2∙s$$-$$1. Approximately 1,400 independent mass isotopomer measurements obtained from analysis of 37 metabolite fragment ions were regressed to estimate 136 total fluxes (54 free fluxes) under each condition. The results provide a comprehensive description of changes in carbon partitioning and overall photosynthetic flux after long-term developmental acclimation of leaves to high light. Despite a doubling in the carboxylation rate, the photorespiratory flux increased from 17 to 28% of net CO2 assimilation with high-light acclimation (Vc/Vo: 3.5:1 vs. 2.3:1, respectively). In conclusion, this study highlights the potential of 13C INST-MFA to describe emergent flux phenotypes that respond to environmental conditions or plant physiology and cannot be obtained by other complementary approaches.

Research Organization:
Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Organization:
USDOE; USDA; National Science Foundation (NSF)
Grant/Contract Number:
AC05-06OR23100; EF-1105249; P200A090323
OSTI ID:
1348223
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 111, Issue 47; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 148 works
Citation information provided by
Web of Science

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Cited By (33)

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Light Stress Responses and Prospects for Engineering Light Stress Tolerance in Crop Plants journal March 2019
Methods and advances in metabolic flux analysis: a mini-review journal January 2015
The challenge and potential of photosynthesis: unique considerations for metabolic flux measurements in photosynthetic microorganisms journal November 2018
Dissecting metabolic flux in C4 plants: experimental and theoretical approaches journal June 2018
Insights into the spatial and temporal organisation of plant metabolism from network flux analysis journal December 2018
Computational analysis of the productivity potential of CAM journal February 2018
Model metabolic strategy for heterotrophic bacteria in the cold ocean based on Colwellia psychrerythraea 34H journal November 2018
Reduced mitochondrial malate dehydrogenase activity has a strong effect on photorespiratory metabolism as revealed by 13 C labelling journal February 2016
Perspectives for a better understanding of the metabolic integration of photorespiration within a complex plant primary metabolism network journal April 2016
Synthetic biology approaches for improving photosynthesis journal January 2019
Metabolite profiles reveal interspecific variation in operation of the Calvin–Benson cycle in both C4 and C3 plants journal February 2019
Triose phosphate utilization and beyond: from photosynthesis to end product synthesis journal March 2019
Relationship between irradiance and levels of Calvin–Benson cycle and other intermediates in the model eudicot Arabidopsis and the model monocot rice journal July 2019
Arabidopsis PPC2 is crucial for growth at low CO2 by involvement in photorespiratory metabolism and integration of ABI5 posted_content September 2019
Engineering central metabolism - a grand challenge for plant biologists journal March 2017
Integrated omics analysis of specialized metabolism in medicinal plants journal March 2017
Concurrent isotope-assisted metabolic flux analysis and transcriptome profiling reveal responses of poplar cells to altered nitrogen and carbon supply journal January 2018
In silico metabolic network analysis of Arabidopsis leaves journal October 2016
Shoot tip culture: a step towards 13C metabolite flux analysis of sink leaf metabolism journal May 2019
A photorespiratory bypass increases plant growth and seed yield in biofuel crop Camelina sativa journal October 2015
Deciphering cyanobacterial phenotypes for fast photoautotrophic growth via isotopically nonstationary metabolic flux analysis journal November 2017
Parallel isotope differential modeling for instationary 13C fluxomics at the genome scale journal June 2020
Pool size measurements facilitate the determination of fluxes at branching points in non-stationary metabolic flux analysis: the case of Arabidopsis thaliana journal June 2015
Decoding Biosynthetic Pathways in Plants by Pulse-Chase Strategies Using 13CO2 as a Universal Tracer journal July 2016
Limitations of Deuterium-Labelled Substrates for Quantifying NADPH Metabolism in Heterotrophic Arabidopsis Cell Cultures journal September 2019
Quantifying plant phenotypes with isotopic labeling & metabolic flux analysis journal February 2016
Metabolic flux analysis of secondary metabolism in plants journal June 2020
Resolving the central metabolism of Arabidopsis guard cells journal August 2017
Sterile spikelets assimilate carbon in sorghum and related grasses journal January 2019
Mass Isotopologue Distribution of dimer ion adducts of intracellular metabolites for potential applications in 13C Metabolic Flux Analysis journal August 2019
13C-Metabolic Flux Analysis: An Accurate Approach to Demystify Microbial Metabolism for Biochemical Production journal December 2015
Strategies for Extending Metabolomics Studies with Stable Isotope Labelling and Fluxomics journal October 2016

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