| Protecting cell walls from binding aluminum by organic acids contributes to aluminum resistance. | |
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MedLine Citation:
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PMID: 19522816 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Aluminum-induced secretion of organic acids from the root apex has been demonstrated to be one major Al resistance mechanism in plants. However, whether the organic acid concentration is high enough to detoxify Al in the growth medium is frequently questioned. The genotypes of Al-resistant wheat, Cassia tora L. and buckwheat secrete malate, citrate and oxalate, respectively. In the present study we found that at a 35% inhibition of root elongation, the Al activities in the solution were 10, 20, and 50 muM with the corresponding malate, citrate, and oxalate exudation at the rates of 15, 20 and 21 nmol/cm(2) per 12 h, respectively, for the above three plant species. When exogenous organic acids were added to ameliorate Al toxicity, twofold and eightfold higher oxalate and malate concentrations were required to produce the equal effect by citrate. After the root apical cell walls were isolated and preincubated in 1 mM malate, oxalate or citrate solution overnight, the total amount of Al adsorbed to the cell walls all decreased significantly to a similar level, implying that these organic acids own an equal ability to protect the cell walls from binding Al. These findings suggest that protection of cell walls from binding Al by organic acids may contribute significantly to Al resistance. |
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Authors:
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Ya-Ying Li; Yue-Jiao Zhang; Yuan Zhou; Jian-Li Yang; Shao-Jian Zheng |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of integrative plant biology Volume: 51 ISSN: 1744-7909 ISO Abbreviation: J Integr Plant Biol Publication Date: 2009 Jun |
Date Detail:
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Created Date: 2009-06-15 Completed Date: 2009-08-28 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101250502 Medline TA: J Integr Plant Biol Country: Australia |
Other Details:
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Languages: eng Pagination: 574-80 Citation Subset: IM |
Affiliation:
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Ministry of Agriculture Key Laboratory for Non-Point Pollution Control, Zhejiang University, Hangzhou, China. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adsorption
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drug effects Aluminum / metabolism*, pharmacology*, toxicity Angiosperms / cytology, drug effects*, metabolism Carboxylic Acids / metabolism* Cassia / cytology, drug effects, metabolism Cell Wall / drug effects*, metabolism* Citrates / metabolism Drug Resistance / drug effects* Fagopyrum / cytology, drug effects, metabolism Kinetics Malates / metabolism Oxalates / metabolism Plant Roots / drug effects, growth & development, metabolism Triticum / cytology, drug effects, metabolism |
| Chemical | |
Reg. No./Substance:
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0/Carboxylic Acids; 0/Citrates; 0/Malates; 0/Oxalates; 6915-15-7/malic acid; 7429-90-5/Aluminum |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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