ArticleNature plants2022
Sugar loading is not required for phloem sap flow in maize plants.
Article in Nature plants, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Engineering vascular potassium transport increases yield and drought resilience of cassava.Nature plants · 2025Article
- Potassium extrusion by plant cells: evolution from an emergency valve to a driver of long-distance transport.The New phytologist · 2025Review
- Potassium stimulates fruit sugar accumulation by increasing carbon flow inHorticulture research · 2024Article
- Phloem Sap Composition: What Have We Learnt from Metabolomics?International journal of molecular sciences · 2023Review
- The Surprising Dynamics of Electrochemical Coupling at Membrane Sandwiches in Plants.Plants (Basel, Switzerland) · 2023Article
- Sugar accumulation enhancement in sorghum stem is associated with reduced reproductive sink strength and increased phloem unloading activity.Frontiers in plant science · 2023Article
- Comparative analyses of the metabolite and ion concentrations in nectar, nectaries, and leaves of 36 bromeliads with different photosynthesis and pollinator types.Frontiers in plant science · 2022Article
- Translocation of Foliar-Applied Nanoparticles: A Critical Review From a Plant Science Perspective.Physiologia plantarumReview
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14 authors.
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No grant is acknowledged in the PubMed record.
Abstract
Phloem transport of photoassimilates from leaves to non-photosynthetic organs, such as the root and shoot apices and reproductive organs, is crucial to plant growth and yield. For nearly 90 years, evidence has been generally consistent with the theory of a pressure-flow mechanism of phloem transport. Central to this hypothesis is the loading of osmolytes, principally sugars, into the phloem to generate the osmotic pressure that propels bulk flow. Here we used genetic and light manipulations to test whether sugar import into the phloem is required as the driving force for phloem sap flow. Using carbon-11 radiotracer, we show that a maize sucrose transporter1 (sut1) loss-of-function mutant has severely reduced export of carbon from photosynthetic leaves (only ~4% of the wild type level). Yet, the mutant remarkably maintains phloem pressure at ~100% and sap flow speeds at ~50-75% of those of wild type. Potassium (K
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