Differential Ion Accumulation and Ion Fluxes in the Mesophyll and Epidermis of Barley

In barley (Hordeum vulgare L.) leaves, differential ion accumulation commonly results in inorganic phosphate (Pi) being confined to the mesophyll and Ca2+ to the epidermis, with preferential epidermal accumulation of Cl-, Na+, and some other ions. The pattern was confirmed in this study for major in...

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Published inPlant physiology (Bethesda) Vol. 122; no. 3; pp. 835 - 844
Main Authors Alison J. Karley, Leigh, Roger A., Sanders, Dale
Format Journal Article
LanguageEnglish
Published Rockville, MD American Society of Plant Physiologists 01.03.2000
American Society of Plant Biologists
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Abstract In barley (Hordeum vulgare L.) leaves, differential ion accumulation commonly results in inorganic phosphate (Pi) being confined to the mesophyll and Ca2+ to the epidermis, with preferential epidermal accumulation of Cl-, Na+, and some other ions. The pattern was confirmed in this study for major inorganic anions and cations by analysis of barley leaf protoplasts. The work focused on the extent to which differences in plasma membrane ion transport processes underlie these observations. Ion transport across the plasma membrane of barley epidermal and mesophyll protoplasts was investigated electrophysiologically (by microelectrode impalement and patch clamping) and radiometrically. Data from both approaches suggested that similar types of ion-selective channels and membrane transporters, which catalyze the transport of Ca2+, K+, Na+, and Pi, exist in the plasma membrane of the two cell types. In general, the simple presence or absence of ion transporters could not explain cell-type-specific differences in ion accumulation. However, patch-clamp data suggested that differential regulation of instantaneously activating ion channels in the plasma membrane could explain the preferential accumulation of Na+ in the epidermis.
AbstractList In barley (Hordeum vulgare L.) leaves, differential ion accumulation commonly results in inorganic phosphate (Pi) being confined to the mesophyll and Ca(2+) to the epidermis, with preferential epidermal accumulation of Cl(-), Na(+), and some other ions. The pattern was confirmed in this study for major inorganic anions and cations by analysis of barley leaf protoplasts. The work focused on the extent to which differences in plasma membrane ion transport processes underlie these observations. Ion transport across the plasma membrane of barley epidermal and mesophyll protoplasts was investigated electrophysiologically (by microelectrode impalement and patch clamping) and radiometrically. Data from both approaches suggested that similar types of ion-selective channels and membrane transporters, which catalyze the transport of Ca(2+), K(+), Na(+), and Pi, exist in the plasma membrane of the two cell types. In general, the simple presence or absence of ion transporters could not explain cell-type-specific differences in ion accumulation. However, patch-clamp data suggested that differential regulation of instantaneously activating ion channels in the plasma membrane could explain the preferential accumulation of Na(+) in the epidermis.
In barley ( Hordeum vulgare L.) leaves, differential ion accumulation commonly results in inorganic phosphate (Pi) being confined to the mesophyll and Ca 2+ to the epidermis, with preferential epidermal accumulation of Cl − , Na + , and some other ions. The pattern was confirmed in this study for major inorganic anions and cations by analysis of barley leaf protoplasts. The work focused on the extent to which differences in plasma membrane ion transport processes underlie these observations. Ion transport across the plasma membrane of barley epidermal and mesophyll protoplasts was investigated electrophysiologically (by microelectrode impalement and patch clamping) and radiometrically. Data from both approaches suggested that similar types of ion-selective channels and membrane transporters, which catalyze the transport of Ca 2+ , K + , Na + , and Pi, exist in the plasma membrane of the two cell types. In general, the simple presence or absence of ion transporters could not explain cell-type-specific differences in ion accumulation. However, patch-clamp data suggested that differential regulation of instantaneously activating ion channels in the plasma membrane could explain the preferential accumulation of Na + in the epidermis.
In barley (Hordeum vulgare L.) leaves, differential ion accumulation commonly results in inorganic phosphate (Pi) being confined to the mesophyll and Ca2+ to the epidermis, with preferential epidermal accumulation of Cl-, Na+, and some other ions. The pattern was confirmed in this study for major inorganic anions and cations by analysis of barley leaf protoplasts. The work focused on the extent to which differences in plasma membrane ion transport processes underlie these observations. Ion transport across the plasma membrane of barley epidermal and mesophyll protoplasts was investigated electrophysiologically (by microelectrode impalement and patch clamping) and radiometrically. Data from both approaches suggested that similar types of ion-selective channels and membrane transporters, which catalyze the transport of Ca2+, K+, Na+, and Pi, exist in the plasma membrane of the two cell types. In general, the simple presence or absence of ion transporters could not explain cell-type-specific differences in ion accumulation. However, patch-clamp data suggested that differential regulation of instantaneously activating ion channels in the plasma membrane could explain the preferential accumulation of Na+ in the epidermis.
In barley (Hordeum vulgare L.) leaves, differential ion accumulation commonly results in inorganic phosphate (Pi) being confined to the mesophyll and Ca(2+) to the epidermis, with preferential epidermal accumulation of Cl(-), Na(+), and some other ions. The pattern was confirmed in this study for major inorganic anions and cations by analysis of barley leaf protoplasts. The work focused on the extent to which differences in plasma membrane ion transport processes underlie these observations. Ion transport across the plasma membrane of barley epidermal and mesophyll protoplasts was investigated electrophysiologically (by microelectrode impalement and patch clamping) and radiometrically. Data from both approaches suggested that similar types of ion-selective channels and membrane transporters, which catalyze the transport of Ca(2+), K(+), Na(+), and Pi, exist in the plasma membrane of the two cell types. In general, the simple presence or absence of ion transporters could not explain cell-type-specific differences in ion accumulation. However, patch-clamp data suggested that differential regulation of instantaneously activating ion channels in the plasma membrane could explain the preferential accumulation of Na(+) in the epidermis.In barley (Hordeum vulgare L.) leaves, differential ion accumulation commonly results in inorganic phosphate (Pi) being confined to the mesophyll and Ca(2+) to the epidermis, with preferential epidermal accumulation of Cl(-), Na(+), and some other ions. The pattern was confirmed in this study for major inorganic anions and cations by analysis of barley leaf protoplasts. The work focused on the extent to which differences in plasma membrane ion transport processes underlie these observations. Ion transport across the plasma membrane of barley epidermal and mesophyll protoplasts was investigated electrophysiologically (by microelectrode impalement and patch clamping) and radiometrically. Data from both approaches suggested that similar types of ion-selective channels and membrane transporters, which catalyze the transport of Ca(2+), K(+), Na(+), and Pi, exist in the plasma membrane of the two cell types. In general, the simple presence or absence of ion transporters could not explain cell-type-specific differences in ion accumulation. However, patch-clamp data suggested that differential regulation of instantaneously activating ion channels in the plasma membrane could explain the preferential accumulation of Na(+) in the epidermis.
In barley (Hordeum vulgare L.) leaves, differential ion accumulation commonly results in inorganic phosphate (Pi) being confined to the mesophyll and Ca2+ to the epidermis, with preferential epidermal accumulation of Cl−, Na+, and some other ions. The pattern was confirmed in this study for major inorganic anions and cations by analysis of barley leaf protoplasts. The work focused on the extent to which differences in plasma membrane ion transport processes underlie these observations. Ion transport across the plasma membrane of barley epidermal and mesophyll protoplasts was investigated electrophysiologically (by microelectrode impalement and patch clamping) and radiometrically. Data from both approaches suggested that similar types of ion-selective channels and membrane transporters, which catalyze the transport of Ca2+, K+, Na+, and Pi, exist in the plasma membrane of the two cell types. In general, the simple presence or absence of ion transporters could not explain cell-type-specific differences in ion accumulation. However, patch-clamp data suggested that differential regulation of instantaneously activating ion channels in the plasma membrane could explain the preferential accumulation of Na+ in the epidermis.
Author Alison J. Karley
Sanders, Dale
Leigh, Roger A.
AuthorAffiliation Department of Biology, University of York, P.O. Box 373, York YO10 5YW, United Kingdom (A.J.K., D.S.); and Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, Herts AL5 2JQ, United Kingdom (R.A.L.)
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Issue 3
Keywords Phosphates
Monocotyledones
Calcium
Hordeum vulgare
Cell permeability
Electrophysiology
Tissue specificity
Epidermis
Ionic channel
Plant leaf
Cereal crop
Ionic selectivity
Mesophyll
Sodium
Gramineae
Chlorides
Angiospermae
Plasma membrane
Spermatophyta
Biological accumulation
Language English
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Present address: Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK.
Corresponding author; e-mail ajk9@york.ac.uk; fax 44–1904–432860.
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PublicationDate 2000-03-01
PublicationDateYYYYMMDD 2000-03-01
PublicationDate_xml – month: 03
  year: 2000
  text: 2000-03-01
  day: 01
PublicationDecade 2000
PublicationPlace Rockville, MD
PublicationPlace_xml – name: Rockville, MD
– name: United States
– name: Rockville
PublicationTitle Plant physiology (Bethesda)
PublicationTitleAlternate Plant Physiol
PublicationYear 2000
Publisher American Society of Plant Physiologists
American Society of Plant Biologists
Publisher_xml – name: American Society of Plant Physiologists
– name: American Society of Plant Biologists
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Snippet In barley (Hordeum vulgare L.) leaves, differential ion accumulation commonly results in inorganic phosphate (Pi) being confined to the mesophyll and Ca2+ to...
In barley (Hordeum vulgare L.) leaves, differential ion accumulation commonly results in inorganic phosphate (Pi) being confined to the mesophyll and Ca(2+) to...
In barley ( Hordeum vulgare L.) leaves, differential ion accumulation commonly results in inorganic phosphate (Pi) being confined to the mesophyll and Ca 2+ to...
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pubmed
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jstor
SourceType Open Access Repository
Aggregation Database
Index Database
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StartPage 835
SubjectTerms Absorption. Translocation of ions and substances. Permeability
Agronomy. Soil science and plant productions
Anions
Barley
Biological and medical sciences
calcium
Calcium - metabolism
Cations
Cell Biology and Signal Transduction
Cell Membrane
Cell Membrane - metabolism
Cell membranes
Cell physiology
chlorides
Economic plant physiology
electrophysiology
Epidermal cells
Epidermis
Fundamental and applied biological sciences. Psychology
Guard cells
Hordeum
Hordeum - metabolism
Hordeum vulgare
inorganic ions
Ion accumulation
Ion Channels
Ion Channels - metabolism
Ion Transport
Leaves
Membrane Potentials
Membranes
Mesophyll
Mesophyll cells
metabolism
Nutrition. Photosynthesis. Respiration. Metabolism
Patch-Clamp Techniques
phosphates
Phosphates - metabolism
Plant cells
Plant Leaves
Plant Leaves - metabolism
Plant physiology and development
plasma membrane
Plasma membrane and permeation
potassium
Potassium - metabolism
Protoplasts
Protoplasts - metabolism
sodium
Sodium - metabolism
Transport processes
Title Differential Ion Accumulation and Ion Fluxes in the Mesophyll and Epidermis of Barley
URI https://www.jstor.org/stable/4279159
https://www.ncbi.nlm.nih.gov/pubmed/10712547
https://www.proquest.com/docview/218614192
https://www.proquest.com/docview/49345007
https://www.proquest.com/docview/70964541
https://pubmed.ncbi.nlm.nih.gov/PMC58919
Volume 122
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