Document Detail

Immobilization of aluminum with phosphorus in roots is associated with high aluminum resistance in buckwheat.
MedLine Citation:
PMID:  15863697     Owner:  NLM     Status:  MEDLINE    
Oxalic acid secretion from roots is considered to be an important mechanism for aluminum (Al) resistance in buckwheat (Fygopyrum esculentum Moench). Nonetheless, only a single Al-resistant buckwheat cultivar was used to investigate the significance of oxalic acid in detoxifying Al. In this study, we investigated two buckwheat cultivars, Jiangxi (Al resistant) and Shanxi (Al sensitive), which showed significant variation in their resistance to Al stress. In the presence of 0 to 100 microM Al, the inhibition of root elongation was greater in Shanxi than that in Jiangxi, and the Al content of root apices (0-10 mm) was much lower in Jiangxi. However, the dependence of oxalic acid secretion on external Al concentration and the time course for secretion were similar in both cultivars. Furthermore, the variation in Al-induced oxalic acid efflux along the root was similar, showing a 10-fold greater efflux from the apical 0- to 5-mm region than from the 5- to 10-mm region. These results suggest that both Shanxi and Jiangxi possess an equal capacity for Al-dependent oxalic acid secretion. Another two potential Al resistance mechanisms, i.e. Al-induced alkalinization of rhizosphere pH and root inorganic phosphate release, were also not involved in their differential Al resistance. However, after longer treatments in Al (10 d), the concentrations of phosphorus and Al in the roots of the Al-resistant cultivar Jiangxi were significantly higher than those in Shanxi. Furthermore, more Al was localized in the cell walls of the resistant cultivar. All these results suggest that while Al-dependent oxalic acid secretion might contribute to the overall high resistance to Al stress of buckwheat, this response cannot explain the variation in tolerance between these two cultivars. We present evidence suggesting the greater Al resistance in buckwheat is further related to the immobilization and detoxification of Al by phosphorus in the root tissues.
Shao Jian Zheng; Jian Li Yang; Yun Feng He; Xue Hui Yu; Lei Zhang; Jiang Feng You; Ren Fang Shen; Hideaki Matsumoto
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-04-29
Journal Detail:
Title:  Plant physiology     Volume:  138     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  2005 May 
Date Detail:
Created Date:  2005-05-12     Completed Date:  2005-11-01     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  297-303     Citation Subset:  IM    
College of Life Science, Zhejiang University, Hangzhou 310029, China.
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MeSH Terms
Aluminum / pharmacokinetics*,  pharmacology
Dose-Response Relationship, Drug
Fagopyrum / drug effects,  metabolism*
Immunity, Innate
Oxalic Acid / metabolism
Phosphorus / metabolism
Plant Roots / drug effects,  metabolism
Reg. No./Substance:
144-62-7/Oxalic Acid; 7429-90-5/Aluminum; 7723-14-0/Phosphorus

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

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