ReviewProtoplasma2011
Symplasmic transport and phloem loading in gymnosperm leaves.
Review in Protoplasma, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
19 citing papers in PubMed, 70 citations in OpenAlex.
- Towards better understanding of assimilate transfer and phloem loading in conifer trees.Journal of experimental botany · 2026Article
- Measuring Phloem Transport Velocity on a Tissue-Level Using a Phloem-Mobile Dye.Methods in molecular biology (Clifton, N.J.) · 2026Article
- Isotope Measurements of Phloem-Transported Organic Matter: Tools to Obtain Information on Gas Exchange Physiology and Transport Processes, and to Better Understand Tree Ring Archives.Methods in molecular biology (Clifton, N.J.) · 2026Review
- Filling in the gaps: evidence of leaf endodermis and vein sheath in gymnosperms.Annals of botany · 2025Article
- Relieving the transfusion tissue traffic jam: a network model of radial transport in conifer needles.The New phytologist · 2024Article
- Article
- Coordination Between Phloem Loading and Structure Maintains Carbon Transport Under Drought.Frontiers in plant science · 2022Article
- Bioimaging Techniques Reveal Foliar Phosphate Uptake Pathways and Leaf Phosphorus Status.Plant physiology · 2020Article
- Article
- Phosphosite charge rather than shootward localization determines OCTOPUS activity in root protophloem.Proceedings of the National Academy of Sciences of the United States of America · 2017Article
- Scaling of phloem structure and optimality of photoassimilate transport in conifer needles.Proceedings. Biological sciences · 2015Article
- Diffusion or bulk flow: how plasmodesmata facilitate pre-phloem transport of assimilates.Journal of plant research · 2015Review
- Uptake of water via branches helps timberline conifers refill embolized xylem in late winter.Plant physiology · 2014Article
- The oxygen isotope enrichment of leaf-exported assimilates--does it always reflect lamina leaf water enrichment?The New phytologist · 2013Article
- Modeling the parameters for plasmodesmal sugar filtering in active symplasmic phloem loaders.Frontiers in plant science · 2013Article
- Eduard Strasburger (1844-1912): founder of modern plant cell biology.Protoplasma · 2012Review
- Review
- Negotiating on identity-glimpses on biological borders.Protoplasma · 2012Article
- In vivo quantification of cell coupling in plants with different phloem-loading strategies.Plant physiology · 2012Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Despite more than 130 years of research, phloem loading is far from being understood in gymnosperms. In part this is due to the special architecture of their leaves. They differ from angiosperm leaves among others by having a transfusion tissue between bundle sheath and the axial vascular elements. This article reviews the somewhat inaccessible and/or neglected literature and identifies the key points for pre-phloem transport and loading of photoassimilates. The pre-phloem pathway of assimilates is structurally characterized by a high number of plasmodesmata between all cell types starting in the mesophyll and continuing via bundle sheath, transfusion parenchyma, Strasburger cells up to the sieve elements. Occurrence of median cavities and branching indicates that primary plasmodesmata get secondarily modified and multiplied during expansion growth. Only functional tests can elucidate whether this symplasmic pathway is indeed continuous for assimilates, and if phloem loading in gymnosperms is comparable with the symplasmic loading mode in many angiosperm trees. In contrast to angiosperms, the bundle sheath has properties of an endodermis and is equipped with Casparian strips or other wall modifications that form a domain border for any apoplasmic transport. It constitutes a key point of control for nutrient transport, where the opposing flow of mineral nutrients and photoassimilates has to be accommodated in each single cell, bringing to mind the principle of a revolving door. The review lists a number of experiments needed to elucidate the mode of phloem loading in gymnosperms.
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What OpenQuestion holds
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.