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Phosphorus-deficiency reduces aluminium toxicity by altering uptake and metabolism of root zone carbon dioxide.
MedLine Citation:
PMID:  20926158     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The role of phosphorus (P) status in root-zone CO(2) utilisation for organic acid synthesis during Al(3+) toxicity was assessed. Root-zone CO(2) can be incorporated into organic acids via Phosphoenolpyruvate carboxylase (PEPC, EC 4.1.1.31). P-deficiency and Al(3+) toxicity can induce organic acid synthesis, but it is unknown how P status affects the utilisation of PEPC-derived organic acids during Al(3+) toxicity. Two-week-old Solanum lycopersicum seedlings were transferred to hydroponic culture for 3 weeks. The hydroponic culture consisted of a standard Long Ashton nutrient solution containing either 0.1μM or 1mM P. Short-term Al(3+) toxicity was induced by a 60-min exposure to a pH-buffered solution (pH 4.5) containing 2mM CaSO(4) and 50μM AlCl(3). Al(3+) toxicity induced a decline in root respiration, adenylate concentrations and an increase in root-zone CO(2) utilisation for both P sufficient and P-deficient plants. However during Al(3+) toxicity, P deficiency enhanced the incorporation and metabolism of root-zone CO(2) via PEPC. Moreover, P deficiency led to a greater proportion of the PEPC-derived organic acids to be exuded during Al(3+) toxicity. These results indicate that P-status can influence the response to Al(3+) by inducing a greater utilisation of PEPC-derived organic acids for Al(3+) detoxification.
Authors:
Caroline L Ward; Aleysia Kleinert; Katia C Scortecci; Vagner A Benedito; Alexander J Valentine
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of plant physiology     Volume:  168     ISSN:  1618-1328     ISO Abbreviation:  J. Plant Physiol.     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-01-31     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882059     Medline TA:  J Plant Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  459-65     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier GmbH. All rights reserved.
Affiliation:
Botany and Zoology Department, Faculty of Science, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africa.
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