Document Detail

Protecting cell walls from binding aluminum by organic acids contributes to aluminum resistance.
MedLine Citation:
PMID:  19522816     Owner:  NLM     Status:  MEDLINE    
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.
Ya-Ying Li; Yue-Jiao Zhang; Yuan Zhou; Jian-Li Yang; Shao-Jian Zheng
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of integrative plant biology     Volume:  51     ISSN:  1744-7909     ISO Abbreviation:  J Integr Plant Biol     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-06-15     Completed Date:  2009-08-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101250502     Medline TA:  J Integr Plant Biol     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  574-80     Citation Subset:  IM    
Ministry of Agriculture Key Laboratory for Non-Point Pollution Control, Zhejiang University, Hangzhou, China.
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MeSH Terms
Adsorption / 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
Malates / metabolism
Oxalates / metabolism
Plant Roots / drug effects,  growth & development,  metabolism
Triticum / cytology,  drug effects,  metabolism
Reg. No./Substance:
0/Carboxylic Acids; 0/Citrates; 0/Malates; 0/Oxalates; 6915-15-7/malic acid; 7429-90-5/Aluminum

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