| Phosphorus-deficiency reduces aluminium toxicity by altering uptake and metabolism of root zone carbon dioxide. | |
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MedLine Citation:
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PMID: 20926158 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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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. |
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Authors:
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Caroline L Ward; Aleysia Kleinert; Katia C Scortecci; Vagner A Benedito; Alexander J Valentine |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of plant physiology Volume: 168 ISSN: 1618-1328 ISO Abbreviation: J. Plant Physiol. Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-01-31 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9882059 Medline TA: J Plant Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 459-65 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier GmbH. All rights reserved. |
Affiliation:
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Botany and Zoology Department, Faculty of Science, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africa. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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