Skip Navigation

This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (29)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Delisle, G.
Right arrow Articles by Houde, M.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Delisle, G.
Right arrow Articles by Houde, M.
Agricola
Right arrow Articles by Delisle, G.
Right arrow Articles by Houde, M.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Plant and Cell Physiology, 2001, Vol. 42, No. 3 324-333
© 2001 Oxford University Press

Characterization of Oxalate Oxidase and Cell Death in Al-Sensitive and Tolerant Wheat Roots

Georges Delisle, Marie Champoux and Mario Houde1

Département des sciences biologiques, Université du Québec à Montréal, C.P. 8888 Succursale "Centre-Ville", Montréal, Québec, Canada, H3C 3P8

Several genes including oxalate oxidase (Oxo) are up-regulated in Triticum aestivum L. root tips exposed to Al. To better understand the function of Oxo during Al exposure, the protein level and enzyme activity were measured. The data indicate that both Oxo protein and activity are increased proportionally to the level of root growth inhibition (RGI). A high level of Oxo expression may result in excess H2O2 production which could become toxic and induce cell death. However, the timing of H2O2 production (observed after 24 h) indicates that it cannot be the primary cause of cell death first observed after 8 h. Moreover, at Al concentrations resulting in 50% RGI, we did not observe any cell death in the sensitive cultivar while a punctated pattern of death involving small groups of cells was found in the tolerant cultivar. This pattern was maintained for several days in the tolerant cultivar, suggesting the involvement of a cell death mechanism aimed at replacing epidermal cells intoxicated with Al while root growth is maintained. The accelerated epidermal cell turnover may represent a new detoxification mechanism helping to protect deeper cell layers of the meristematic and elongation zone essential for root growth.

1 Corresponding author: E-mail, houde.mario@uqam.ca; Fax, +1-514-987-4647.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 J Exp BotHome page
S. Zhou, R. Sauve, and T. W. Thannhauser
Proteome changes induced by aluminium stress in tomato roots
J. Exp. Bot., April 1, 2009; 60(6): 1849 - 1857.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.