Document Detail

Growth inhibition, turgor maintenance, and changes in yield threshold after cessation of solute import in pea epicotyls.
MedLine Citation:
PMID:  11537436     Owner:  NASA     Status:  MEDLINE    
The dependence of stem elongation on solute import was investigated in etiolated pea seedlings (Pisum sativum L. var Alaska) by excising the cotyledons. Stem elongation was inhibited by 60% within 5 hours of excision. Dry weight accumulation into the growing region stopped and osmotic pressure of the cell sap declined by 0.14 megapascal over 5 hours. Attempts to assay phloem transport via ethylenediaminetetraacetate-enhanced exudation from cut stems revealed no effect of cotyledon excision, indicating that the technique measured artifactual leakage from cells. Despite the drop in cell osmotic pressure, turgor pressure (measured directly via a pressure probe) did not decline. Turgor maintenance is postulated to occur via uptake of solutes from the free space, thereby maintaining the osmotic pressure difference across the cell membrane. Cell wall properties were measured by the pressure-block stress relaxation technique. Results indicate that growth inhibition after cotyledon excision was mediated primarily via an increase in the wall yield threshold.
J G Schmalstig; D J Cosgrove
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Plant physiology     Volume:  88     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1988  
Date Detail:
Created Date:  1996-10-07     Completed Date:  1996-10-07     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1240-5     Citation Subset:  S    
Department of Biology, The Pennsylvania State University, University Park 16802, USA.
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MeSH Terms
Cell Wall / physiology
Cotyledon / cytology,  growth & development*,  metabolism*
Edetic Acid / metabolism
Osmolar Concentration
Osmotic Pressure
Peas / growth & development*,  metabolism*
Plant Stems / growth & development,  metabolism*
Grant Support
Reg. No./Substance:
0/Solutions; 60-00-4/Edetic Acid
D J Cosgrove / PA St U, University Park

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

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