Document Detail

Radial transport of water and abscisic acid (ABA) in roots of Zea mays under conditions of nutrient deficiency.
MedLine Citation:
PMID:  15699064     Owner:  NLM     Status:  MEDLINE    
Radial water (J(V)) and abscisic acid (ABA) flows (J(ABA)) through maize root seedlings have been investigated under different conditions of nutrient deficiency. Whereas J(V) was reduced under nitrogen deficiency, potassium deficiency stimulated J(V). A substantial increase of J(ABA) was observed in roots kept under potassium deficiency. The observed changes of J(V) might have resulted from changed barrier properties of the endodermis. Nitrogen and potassium deficiency also caused an accumulation of endogenous ABA in root tissues. Under all conditions studied, except under K(+)-deficiency, external ABA (100 nM) caused an increase of J(V). The data of this study were used to analyse the relations between internal and endogenous root ABA, J(V), and J(ABA). The internal ABA of root tissues was positively correlated with J(V) and was highly significant (P <0.001 for internal and P=0.03 for endogenous root ABA) within the range 2-300 pmol g(-1) FW. It was also highly positively correlated to the radial ABA flows. There was also a highly positive correlation between J(V) and J(ABA). The data of this study indicate, for the first time, the relations between internal ABA, water, and ABA flows. Independent of treatment with external ABA, an ABA transport by solvent drag across the endodermis is confirmed.
Daniela Schraut; Hermann Heilmeier; Wolfram Hartung
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-02-07
Journal Detail:
Title:  Journal of experimental botany     Volume:  56     ISSN:  0022-0957     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-03-09     Completed Date:  2005-06-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  879-86     Citation Subset:  IM    
Julius-von-Sachs-Institut für Biowissenschaften, Universität Würzburg, Julius-von-Sachs-Platz 2, D-97082 Würzburg, Germany.
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MeSH Terms
Abscisic Acid / metabolism*
Biological Transport / physiology
Calcium / physiology
Nitrogen / physiology
Phosphorus / physiology
Plant Roots / anatomy & histology,  metabolism*
Potassium / physiology
Seedling / metabolism
Sodium / physiology
Sulfur / physiology
Water / metabolism*
Zea mays / metabolism*
Reg. No./Substance:
21293-29-8/Abscisic Acid; 7440-09-7/Potassium; 7440-23-5/Sodium; 7440-70-2/Calcium; 7704-34-9/Sulfur; 7723-14-0/Phosphorus; 7727-37-9/Nitrogen; 7732-18-5/Water

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

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