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GrainGenes Reference Report: PCP-42-324

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Reference	PCP-42-324
Title	Characterization of oxalate oxidase and cell death in Al-sensitive and tolerant wheat roots
Journal	Plant and Cell Physiology
Year	2001
Volume	42
Pages	324-333
Author	Delisle G Champoux M Houde M
Abstract	Summary: 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
External Databases	Pubmed: 11266584
Keyword	[ Hide all but 1 of 33 ] al aluminum toxicity auxin-binding proteins cell cell death death detoxification disease resistance elongation elongation zone enzyme enzyme activity epidermal cells exposure gene gene expression germin-like protein growth-inhibition h2o2 h2o2-producing enzyme inhibition mechanism oxalate oxidase oxidase oxidative burst powdery mildew fungus root root growth root tips triticum aestivum turnover wall structural proteins wheat root

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