Document Detail

Salicylic acid-induced aluminum tolerance by modulation of citrate efflux from roots of Cassia tora L.
MedLine Citation:
PMID:  12721861     Owner:  NLM     Status:  MEDLINE    
Aluminum-induced exudation of organic acids from roots has been proposed as a mechanism for Al tolerance in plants. To better understand the regulatory process leading to efflux of organic acids, the possible involvement of salicylic acid (SA) in regulating Al-induced citrate release in Cassia tora L. was identified. The response of citrate efflux to exogenous SA was concentration-dependent. Application of SA at 5 microM in solution containing 20 microM Al increased citrate efflux to levels 1.76-fold higher than in controls (20 microM Al alone). However, inhibition of citrate release was observed when SA concentrations increased to more than 20 microM. Increased citrate efflux due to the SA treatment was associated with decreased inhibition of root growth and Al content in root tips, suggesting that exogenous SA could confer Al tolerance by increasing citrate efflux. We also examined citrate synthase activities (EC and citrate concentrations in root tips exposed to Al and/or SA. However, both citrate synthase activities and citrate accumulation remained unaffected. These results indicate that SA-promotion of Al-induced citrate efflux is not correlated with increase in citrate production. Total endogenous SA concentrations were measured in root tips and the SA concentrations were significantly enhanced by Al at levels of 10-50 microM.
Zhi-Min Yang; Jin Wang; Song-Hua Wang; Lang-Lai Xu
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2003-02-15
Journal Detail:
Title:  Planta     Volume:  217     ISSN:  0032-0935     ISO Abbreviation:  Planta     Publication Date:  2003 May 
Date Detail:
Created Date:  2003-04-30     Completed Date:  2003-10-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1250576     Medline TA:  Planta     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  168-74     Citation Subset:  IM    
Department of Biochemistry and Molecular Biology, College of Life Science, Nanjing Agricultural University, 210095, Nanjing, China.
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MeSH Terms
Adaptation, Physiological / drug effects*
Aluminum / metabolism*,  pharmacology
Cassia / drug effects,  growth & development,  metabolism*
Citrate (si)-Synthase / metabolism
Citric Acid / metabolism*
Plant Roots / drug effects,  growth & development,  metabolism*
Salicylic Acid / pharmacology*
Reg. No./Substance:
69-72-7/Salicylic Acid; 7429-90-5/Aluminum; 77-92-9/Citric Acid; EC (si)-Synthase

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

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