Document Detail

The biophysics of leaf growth in salt-stressed barley. A study at the cell level.
MedLine Citation:
PMID:  12011367     Owner:  NLM     Status:  MEDLINE    
Biophysical parameters potentially involved in growth regulation were studied at the single-cell level in the third leaf of barley (Hordeum vulgare) after exposure to various degrees of NaCl stress for 3 to 5 d. Gradients of elongation growth were measured, and turgor pressure, osmolality, and water potentials (psi) were determined (pressure probe and picoliter osmometry) in epidermal cells of the elongation zone and the mature blade. Cells in the elongation zone adjusted to decreasing external psi through increases in cell osmolality that were accomplished by increased solute loads and reduced water contents. Cell turgor changed only slightly. In contrast, decreases in turgor also contributed significantly to psi adjustment in the mature blade. Solute deposition rates in the elongation zone increased at moderate stress levels as compared with control conditions, but decreased again at more severe NaCl exposure. Growth-associated psi gradients between expanding epidermal cells and the xylem were significant under control and moderate stress conditions (75 mM NaCl) but seemed negligible at severe stress (120 mM NaCl). We conclude that leaf cell elongation in NaCl-treated barley is probably limited by the rate at which solutes can be taken up to generate turgor, particularly at high NaCl levels.
Wieland Fricke; Winfried S Peters
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Plant physiology     Volume:  129     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  2002 May 
Date Detail:
Created Date:  2002-05-15     Completed Date:  2002-08-09     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  374-88     Citation Subset:  IM    
Department of Biological Sciences, University of Paisley, Scotland, United Kingdom.
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MeSH Terms
Cell Division / drug effects,  physiology
Hordeum / cytology,  growth & development*
Membrane Potentials / physiology
Osmotic Pressure / drug effects
Plant Epidermis / cytology,  growth & development
Plant Leaves / cytology,  growth & development*
Plant Transpiration / drug effects,  physiology
Sodium Chloride / pharmacology*
Water / pharmacology
Reg. No./Substance:
7647-14-5/Sodium Chloride; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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