The NADH-ubiquinone oxidoreductase complex (complex I) (EC 1.6.5.3) is the main entrance site of electrons into the respiratory chain. In a variety of eukaryotic organisms, except animals and fungi (Opisthokonta), it contains an extra domain comprising trimers of putative γ-carbonic anhydrases, named the CA domain, which has been proposed to be essential for assembly of complex I. However, its physiological role in plants is not fully understood. Here, we report that Arabidopsis mutants defective in two CA subunits show an altered photorespiratory phenotype. Mutants grown in ambient air show growth retardation compared to wild-type plants, a feature that is reversed by cultivating plants in a high-CO2 atmosphere. Moreover, under photorespiratory conditions, carbon assimilation is diminished and glycine accumulates, suggesting an imbalance with respect to photorespiration. Additionally, transcript levels of specific CA subunits are reduced in plants grown under non-photorespiratory conditions. Taken together, these results suggest that the CA domain of plant complex I contributes to sustaining efficient photosynthesis under ambient (photorespiratory) conditions.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1111/tpj.12930 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Chloroplastic Aspartyl-tRNA Synthetase Is Required for Chloroplast Development, Photosynthesis and Photorespiratory Metabolism.
Plant Cell Environ
December 2024
Guangdong Provincial Key Laboratory for the Development Biology and Environmental Adaptation of Agricultural Organisms, College of Life Sciences, South China Agricultural University, Guangzhou, China.
Photorespiration is a complex metabolic process linked to primary plant metabolism and influenced by environmental factors, yet its regulation remains poorly understood. In this study, we identified the asprs3-1 mutant, which displays a photorespiratory phenotype with leaf chlorosis, stunted growth, and diminished photosynthesis under ambient CO, but normal growth under elevated CO conditions. Map-based cloning and genetic complementation identified AspRS3 as the mutant gene, encoding an aspartyl-tRNA synthetase.
View Article and Find Full Text PDFPhotorespiratory Metabolism and Its Regulatory Links to Plant Defence Against Pathogens.
Int J Mol Sci
November 2024
Department of Plant Physiology and Biochemistry, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland.
When plants face biotic stress, the induction of defence responses imposes a massive demand for carbon and energy resources, which could decrease the reserves allocated towards growth. These growth-defence trade-offs have important implications for plant fitness and productivity and influence the outcome of plant-pathogen interactions. Biotic stress strongly affects plant cells' primary metabolism, including photosynthesis and respiration, the main source of energy and carbon skeletons for plant growth, development, and defence.
View Article and Find Full Text PDFCarbon dioxide removal (CDR) potential in temperate macroalgal forests: A comparative study of chemical and biological net ecosystem production (NEP).
Mar Pollut Bull
January 2025
Blue Carbon Implementation Division, Fisheries Resources Management Department, Korea Fisheries Resources Agency (FIRA), Busan 46041, South Korea.
The carbon dioxide removal (CDR) capacity of macroalgae, a crucial component in climate regulation, has gained increasing attention. However, accurately estimating the CDR potential of macroalgae in natural conditions remains challenging, necessitating the use of multiple independent methods to reduce the uncertainties in these estimates. In this study, we compared two methods for estimating net ecosystem production (NEP), a key parameter in determining CDR potential: 1) NEP, derived from seawater carbonate chemistry and 2) NEP, based on photorespiratory measurements using benthic tent incubation.
View Article and Find Full Text PDFRubisco activity and activation state dictate photorespiratory plasticity in Betula papyrifera acclimated to future climate conditions.
Sci Rep
November 2024
Department of Energy-Plant Research Laboratory, Michigan State University, East Lansing, MI, 48824, USA.
Plant metabolism faces a challenge of investing enough enzymatic capacity to a pathway without overinvestment. As it takes energy and resources to build, operate, and maintain enzymes, there are benefits and drawbacks to accurately matching capacity to the pathway influx. The relationship between functional capacity and physiological load could be explained through symmorphosis, which would quantitatively match enzymatic capacity to pathway influx.
View Article and Find Full Text PDFEnhanced photorespiratory and TCA pathways by elevated CO to manage ammonium nutrition in tomato leaves.
Plant Physiol Biochem
December 2024
Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), Leioa, Spain. Electronic address:
Plants grown under exclusive ammonium (NH) nutrition have high carbon (C) demand to sustain proper nitrogen (N) assimilation and energy required for plant growth, generally impaired when compared to nitrate (NO) nutrition. Thereby, the increment of the atmospheric carbon dioxide (CO) concentration, in the context of climate change, will potentially allow plants to better face ammonium nutrition. In this work, tomato (Solanum lycopersicum L.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!