Document Detail

Direct measurement of sodium and potassium in the transpiration stream of salt-excluding and non-excluding varieties of wheat.
MedLine Citation:
PMID:  11520876     Owner:  NLM     Status:  MEDLINE    
The xylem-feeding insect Philaenus spumarius was used to analyse sodium and potassium fluxes in the xylem of intact, transpiring wheat plants. Two cultivars were compared: the salt-excluding (Chinese Spring) and the non-excluding (Langdon). Chinese Spring accumulated much less sodium in its leaves than the salt-sensitive Langdon. After 7 d in 150 mol m(-3) NaCl, the sodium concentration in the leaf sap of Langdon reached over 600 mol m(-3). This was some three-fold greater than that in Chinese Spring. Similar findings have previously been reported from these cultivars. The reduced ion accumulation was specific to sodium; accumulation of K(+) was unaffected by NaCl in Chinese Spring, such that it developed a much lower leaf Na(+)/K(+) ratio than Langdon. The spittlebug, P. spumarius was used to sample xylem sap from both cultivars. This approach showed that the leaf xylem sap of Chinese Spring had much lower levels of sodium than that of Langdon. In the 150 mol m(-3) NaCl treatment, sodium levels in the leaf xylem reached only 2-3 mol m(-3) in Chinese Spring, compared with 8-10 mol m(-3) in Langdon. Transpiration rates were found to be similar in the two varieties. The lower leaf xylem content alone was thus sufficient to account for the reduced accumulation of sodium in leaves of Chinese Spring. The mechanisms by which xylem sodium might be lowered are discussed and it is concluded that sodium is probably excluded from the xylem in the root of Chinese Spring.
R Watson; J Pritchard; M Malone
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of experimental botany     Volume:  52     ISSN:  0022-0957     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2001 Sep 
Date Detail:
Created Date:  2001-08-24     Completed Date:  2001-12-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  1873-81     Citation Subset:  IM    
The School of Biosciences, Division of Agriculture and Horticulture, The University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire LE12 5RD, UK.
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MeSH Terms
Ion Transport
Plant Roots / metabolism
Plant Stems / metabolism
Plant Transpiration / physiology*
Potassium / metabolism*
Sodium / metabolism*
Sodium Chloride / metabolism*
Triticum / classification,  metabolism*
Reg. No./Substance:
7440-09-7/Potassium; 7440-23-5/Sodium; 7647-14-5/Sodium Chloride

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

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