ArticlePlanta2018
Ratio of sugar concentrations in the phloem sap and the cytosol of mesophyll cells in different tree species as an indicator of the phloem loading mechanism.
Article in Planta, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.
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Who cites it
14 citing papers in PubMed, 34 citations in OpenAlex.
- Intra-annual transfer of hydrogen and oxygen isotopic signals from water and sugar precursors to tree rings: Processes and mechanisms.The New phytologist · 2026Article
- Predicting Phloem Loading Types with Electron Microscopy.Methods in molecular biology (Clifton, N.J.) · 2026Article
- Three-dimensional interaction between Cinnamomum camphora and a sap-sucking psyllid insect (Trioza camphorae) revealed by nano-resolution volume electron microscopy.Communications biology · 2025Article
- Global Trends of Treatment for NAFLD from 2012 to 2021: A Bibliometric and Mapping Analysis.Endocrine, metabolic & immune disorders drug targets · 2024Article
- Structure and sucrose binding mechanism of the plant SUC1 sucrose transporter.Nature plants · 2023Article
- A sucrose-specific receptor iniScience · 2023Article
- Highly complete long-read genomes reveal pangenomic variation underlying yeast phenotypic diversity.Genome research · 2023Article
- Phloem Sap Composition: What Have We Learnt from Metabolomics?International journal of molecular sciences · 2023Review
- Tonoplast Sucrose Trafficking Modulates Starch Utilization and Water Deficit Behavior in Poplar Leaves.Plant & cell physiology · 2022Article
- Mobile forms of carbon in trees: metabolism and transport.Tree physiology · 2022Review
- Biotechnology for propagation and secondary metabolite production in Bacopa monnieri.Applied microbiology and biotechnology · 2022Review
- Leaf Carbon Export and Nonstructural Carbohydrates in Relation to Diurnal Water Dynamics in Mature Oak Trees.Plant physiology · 2020Article
- Sugar, amino acid and inorganic ion profiling of the honeydew from different hemipteran species feeding on Abies alba and Picea abies.PloS one · 2020Article
- Direct Comparison of Leaf Plasmodesma Structure and Function in Relation to Phloem-Loading Type.Plant physiology · 2019Article
Corrections and comments
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
MAIN
conclusionSucrose concentration in phloem sap was several times higher than in the cytosol of mesophyll cells. The results suggest that phloem loading involves active steps in the analyzed tree species. Phloem loading in source leaves is a key step for carbon partitioning and passive symplastic loading has been proposed for several tree species. However, experimental evidence to prove the potential for sucrose diffusion from mesophyll to phloem is rare. Here, we analyzed three tree species (two angiosperms, Fagus sylvatica, Magnolia kobus, and one gymnosperm, Gnetum gnemon) to investigate the proposed phloem loading mechanism. For this purpose, the minor vein structure and the sugar concentrations in phloem sap as well as in the subcellular compartments of mesophyll cells were investigated. The analyzed tree species belong to the open type minor vein subcategory. The sucrose concentration in the cytosol of mesophyll cells ranged between 75 and 165 mM and was almost equal to the vacuolar concentration. Phloem sap could be collected from F. sylvatica and M. kobus and the concentration of sucrose in phloem sap was about five- and 11-fold higher, respectively, than in the cytosol of mesophyll cells. Sugar exudation of cut leaves was decreased by p-chloromercuribenzenesulfonic acid, an inhibitor of sucrose-proton transporter. The results suggest that phloem loading of sucrose in the analyzed tree species involves active steps, and apoplastic phloem loading seems more likely.
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