ArticlePlant physiology2005
A new substrate cycle in plants. Evidence for a high glucose-phosphate-to-glucose turnover from in vivo steady-state and pulse-labeling experiments with [13C]glucose and [14C]glucose.
Article in Plant physiology, 2005. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers.
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22 citing papers in PubMed, 82 citations in OpenAlex.
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- Non-conventional pathways enable pennycress (Thlaspi arvense L.) embryos to achieve high efficiency of oil biosynthesis.Journal of experimental botany · 2020Article
- Liquid Chromatography Tandem Mass Spectrometry Quantification ofMetabolites · 2020Article
- High Flux Through the Oxidative Pentose Phosphate Pathway Lowers Efficiency in Developing Camelina Seeds.Plant physiology · 2020Article
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- Engineering Strategies to Boost Crop Productivity by Cutting Respiratory Carbon Loss.The Plant cell · 2019Review
- Toward multifaceted roles of sucrose in the regulation of stomatal movement.Plant signaling & behavior · 2018Article
- Resolving the central metabolism of Arabidopsis guard cells.Scientific reports · 2017Article
- Article
- Dynamic Labeling Reveals Temporal Changes in Carbon Re-Allocation within the Central Metabolism of Developing Apple Fruit.Frontiers in plant science · 2017Article
- In silico metabolic network analysis of Arabidopsis leaves.BMC systems biology · 2016Article
- Differences in membrane selectivity drive phloem transport to the apoplast from which maize florets develop.Annals of botany · 2013Article
- Article
- Substrate cycles in Penicillium chrysogenum quantified by isotopic non-stationary flux analysis.Microbial cell factories · 2012Article
- Sucrose synthase in unicellular cyanobacteria and its relationship with salt and hypoxic stress.Planta · 2012Article
- Comparison between elementary flux modes analysis and 13C-metabolic fluxes measured in bacterial and plant cells.BMC systems biology · 2011Article
- Experimental flux measurements on a network scale.Frontiers in plant science · 2011Article
- Prolonged root hypoxia effects on enzymes involved in nitrogen assimilation pathway in tomato plants.Plant signaling & behavior · 2010Article
- Subcellular flux analysis of central metabolism in a heterotrophic Arabidopsis cell suspension using steady-state stable isotope labeling.Plant physiology · 2010Article
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5 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Substrate (futile) cycling involving carbohydrate turnover has been widely reported in plant tissues, although its extent, mechanisms, and functions are not well known. In this study, two complementary approaches, short and steady-state labeling experiments, were used to analyze glucose metabolism in maize (Zea mays) root tips. Unidirectional rates of synthesis for storage compounds (starch, Suc, and cell wall polysaccharides) were determined by short labeling experiments using [U-14C]glucose and compared with net synthesis fluxes to determine the rate of glucose production from these storage compounds. Steady-state labeling with [1-(13)C]glucose and [U-13C]glucose showed that the redistribution of label between carbon C-1 and C-6 in glucose is close to that in cytosolic hexose-P. These results indicate a high resynthesis flux of glucose from hexose-P that is not accounted for by glucose recycling from storage compounds, thus suggesting the occurrence of a direct glucose-P-to-glucose conversion. An enzyme assay confirmed the presence of substantial glucose-6-phosphatase activity in maize root tips. This new glucose-P-to-glucose cycle was shown to consume around 40% of the ATP generated in the cell, whereas Suc cycling consumes at most 3% to 6% of the ATP produced. The rate of glucose-P cycling differs by a factor of 3 between a maize W22 line and the hybrid maize cv Dea, and is significantly decreased by a carbohydrate starvation pretreatment.
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