ArticlePlant physiology1997
Properties of Two Outward-Rectifying Channels in Root Xylem Parenchyma Cells Suggest a Role in K+ Homeostasis and Long-Distance Signaling.
Article in Plant physiology, 1997. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 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.
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Who cites it
30 citing papers in PubMed, 143 citations in OpenAlex.
- OsKAT1 is a short Shaker potassium channel involved in root-to-shoot potassium translocation and contributes to rice grain yield.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Potassium homeostasis and signalling: from the whole plant to the subcellular level.Quantitative plant biology · 2025Review
- Chloride, glutathiones, and insect-derived elicitors introduced into the xylem trigger electrical signaling.Plant physiology · 2024Article
- Membrane Proteins in Plant Salinity Stress Perception, Sensing, and Response.The Journal of membrane biology · 2023Review
- Xylem KFrontiers in plant science · 2023Article
- Crosstalk between CaPlants (Basel, Switzerland) · 2022Review
- The Ability to Regulate Transmembrane Potassium Transport in Root Is Critical for Drought Tolerance in Barley.International journal of molecular sciences · 2019Article
- The Effect of AtHKT1;1 or AtSOS1 Mutation on the Expressions of Na⁺ or K⁺ Transporter Genes and Ion Homeostasis inInternational journal of molecular sciences · 2019Article
- Mechanisms of Sodium Transport in Plants-Progresses and Challenges.International journal of molecular sciences · 2018Review
- New Insights on Plant Salt Tolerance Mechanisms and Their Potential Use for Breeding.Frontiers in plant science · 2016Review
- ZxNHX controls Na⁺ and K⁺ homeostasis at the whole-plant level in Zygophyllum xanthoxylum through feedback regulation of the expression of genes involved in their transport.Annals of botany · 2015Article
- Plant salt-tolerance mechanisms.Trends in plant science · 2014Review
- Regulation of Na(+) fluxes in plants.Frontiers in plant science · 2014Review
- Learning from halophytes: physiological basis and strategies to improve abiotic stress tolerance in crops.Annals of botany · 2013Review
- Salinity tolerance mechanisms in glycophytes: An overview with the central focus on rice plants.Rice (New York, N.Y.) · 2012Article
- Phylogenetic analysis of k(+) transporters in bryophytes, lycophytes, and flowering plants indicates a specialization of vascular plants.Frontiers in plant science · 2012Article
- AtHKT1;1 mediates nernstian sodium channel transport properties in Arabidopsis root stelar cells.PloS one · 2011Article
- HKT transporter-mediated salinity resistance mechanisms in Arabidopsis and monocot crop plants.Trends in plant science · 2009Review
- Na-K transport in roots under salt stress.Plant signaling & behavior · 2008Article
- Root plasma membrane transporters controlling K+/Na+ homeostasis in salt-stressed barley.Plant physiology · 2007Article
Corrections and comments
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Authors and funding
2 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Xylem parenchyma cells (XPCs) control the composition of the transpiration stream in plants and are thought to play a role in long-distance signaling as well. We addressed the regulation, selectivity, and dependence on the apoplastic ion concentrations of two types of outward rectifiers in the plasma membrane of XPCs, to assess the physiological role of these conductances. In whole-cell recordings, the membrane conductance at depolarization was under the control of cytosolic Ca2+: at physiological Ca2+ levels (150 nM) the K+ outward-rectifying conductance (KORC) predominated, whereas at elevated Ca2+ levels (5 [mu]M), only the nonselective outward-rectifying conductance (NORC) was active. No such regulatory effect of Ca2+ was observed in inside-out experiments. The voltage dependence of whole-cell KORC currents strongly depended on apoplastic K+ concentration: an increase in apoplastic K+ resulted in a positive shift of the current-voltage curve, roughly following the shift in Nernst potential of K+. KORC is impermeable to Na+, but does translocate Ca2+ in addition to K+. In contrast to KORC, NORC selected poorly among monovalent cations and anions, the relative permeability PC+/PA- being about 1.9. Gating of NORC was largely unaffected by the level of K+ in the bath. Under all ionic conditions tested, NORC tail currents or single-channel currents reversed close to 0 mV. Using an in vivo xylem-perfusion technique, tetraethylammonium (an inhibitor of KORC) was shown to block K+ transport to the shoot. These data support the hypothesis that release of K+ to the xylem sap is mediated by KORC. The molecular properties of these two conductances are discussed in the light of the distinct physiological role of XPCs.
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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.