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Updated: Jul 1, 2026
09:54
Isolation and Respiratory Measurements of Mitochondria from Arabidopsis thaliana
Published on: January 5, 2018
Complex I dysfunction redirects cellular and mitochondrial metabolism in Arabidopsis
Marie Garmier1, Adam J Carroll, Etienne Delannoy
1Australian Research Council Centre of Excellence in Plant Energy Biology M316, University of Western Australia, Crawley, Western Australia 6009, Australia.
Plant Physiology
|September 12, 2008
Summary
Mitochondrial complex I inhibition in Arabidopsis cells by rotenone triggers metabolic pathway remodeling. Early metabolic adjustments occur in response to mitochondrial dysfunction, affecting respiration and growth.
Area of Science:
- Plant biology
- Mitochondrial function
- Metabolic regulation
Background:
- Mitochondrial complex I is crucial for NAD oxidation and oxidative phosphorylation in plants.
- Plant complex I possesses unique structural and functional characteristics compared to other organisms.
- The physiological role of complex I in plants remains incompletely understood.
Purpose of the Study:
- To investigate early metabolic adjustments in Arabidopsis cells following complex I inhibition.
- To understand cellular acclimation mechanisms to mitochondrial dysfunction induced by rotenone.
- To elucidate the impact of complex I inhibition on plant cell metabolism and growth.
Main Methods:
- Application of rotenone, a complex I inhibitor, to Arabidopsis cell suspension cultures.
- Monitoring cellular respiration over time (0-12 hours post-treatment).
- Integrated analysis of gene expression, mitochondrial proteome, and primary metabolism.
Main Results:
- Rotenone induced a transient decrease in cellular respiration, followed by recovery.
- Complex I inhibition did not cause oxidative stress or cell death but impacted long-term growth.
- Metabolic analyses revealed alterations in the tricarboxylic acid cycle, glycolytic associations, and amino/organic acid pools, notably 2-oxoglutarate, aspartate, and glutamine.
Conclusions:
- Complex I inhibition by rotenone significantly remodels metabolic pathways in Arabidopsis cells.
- Early metabolic changes are key indicators of mitochondrial dysfunction response.
- Mitochondrial dysfunction elicits broad metabolic adjustments involving multiple cellular compartments.
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