ArticlePlant physiology2017
Phloem Loading through Plasmodesmata: A Biophysical Analysis.
Article in Plant physiology, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers.
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Who cites it
27 citing papers in PubMed, 61 citations in OpenAlex.
- The Contribution of Phloem Metabolism to Leaf Respiration: New Insights Into an Old Problem.Plant, cell & environment · 2026Article
- Resolving subcellular sucrose concentrations in plant tissues.Journal of experimental botany · 2026Review
- The influence of electrical charge on plasmodesma conductivity.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Regulation of Plasmodesmata Function Through Lipid-Mediated PDLP7 or PDLP5 Strategies inPlants (Basel, Switzerland) · 2026Article
- The Evolution of Large Organism Size: Disparate Physiologies Share a Foundation at the Smallest Physical Scales.Life (Basel, Switzerland) · 2025Review
- Genome-Wide Identification and Expression Profiling of Plasma Membrane-Localized SWEET Gene Family Associated with Sugar Transport During Yam Tuber Development.International journal of molecular sciences · 2025Article
- Drought-dependent regulation of cell coupling in Arabidopsis leaf epidermis requires plasmodesmal protein NHL12.Journal of experimental botany · 2024Article
- Overexpression of OsSTP1 increases grain yield via enhancing carbohydrate metabolism and transport in rice.Planta · 2024Article
- Novel resources to investigate leaf plasmodesmata formation in CThe Plant journal : for cell and molecular biology · 2024Article
- Sugar transporters PpSWEET9a and PpSWEET14 synergistically mediate peach sucrose allocation from source leaves to fruit.Communications biology · 2024Article
- Significance of Raffinose Family Oligosaccharides (RFOs) metabolism in plants.Advanced biotechnology · 2024Review
- Research progress and application strategies of sugar transport mechanisms in rice.Frontiers in plant science · 2024Review
- Foliar Calcium Absorption by Tomato Plants: Comparing the Effects of Calcium Sources and Adjuvant Usage.Plants (Basel, Switzerland) · 2023Article
- Review
- An update on passive transport in and out of plant cells.Plant physiology · 2021Review
- Computational Tools for Serial Block Electron Microscopy Reveal Plasmodesmata Distributions and Wall Environments.Plant physiology · 2020Article
- Gaining Sugars While Sweating: How Do Leaves Regulate Their Osmolarity?Plant physiology · 2020Article
- Diverse regulation of plasmodesmal architecture facilitates adaptation to phloem translocation.Journal of experimental botany · 2020Review
- Genome-Wide Profiling and Phylogenetic Analysis of theInternational journal of molecular sciences · 2020Article
- Heterologous expression of the apple hexose transporter MdHT2.2 altered sugar concentration with increasing cell wall invertase activity in tomato fruit.Plant biotechnology journal · 2020Article
Corrections and comments
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In many species, Suc en route out of the leaf migrates from photosynthetically active mesophyll cells into the phloem down its concentration gradient via plasmodesmata, i.e. symplastically. In some of these plants, the process is entirely passive, but in others phloem Suc is actively converted into larger sugars, raffinose and stachyose, and segregated (trapped), thus raising total phloem sugar concentration to a level higher than in the mesophyll. Questions remain regarding the mechanisms and selective advantages conferred by both of these symplastic-loading processes. Here, we present an integrated model-including local and global transport and kinetics of polymerization-for passive and active symplastic loading. We also propose a physical model of transport through the plasmodesmata. With these models, we predict that (1) relative to passive loading, polymerization of Suc in the phloem, even in the absence of segregation, lowers the sugar content in the leaf required to achieve a given export rate and accelerates export for a given concentration of Suc in the mesophyll and (2) segregation of oligomers and the inverted gradient of total sugar content can be achieved for physiologically reasonable parameter values, but even higher export rates can be accessed in scenarios in which polymers are allowed to diffuse back into the mesophyll. We discuss these predictions in relation to further studies aimed at the clarification of loading mechanisms, fitness of active and passive symplastic loading, and potential targets for engineering improved rates of export.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.