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Plant Physiol Biochem. 2012 Oct;59:71-9. doi: 10.1016/j.plaphy.2012.07.006. Epub 2012 Jul 14.

Ascorbate oxidase: the unexpected involvement of a 'wasteful enzyme' in the symbioses with nitrogen-fixing bacteria and arbuscular mycorrhizal fungi.

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  • 1Plant Protection Institute, National Research Council, Turin, Italy.


Ascorbate oxidase (AO, EC catalyzes the oxidation of ascorbate (AsA) to yield water. AO over-expressing plants are prone to ozone and salt stresses, whereas lower expression apparently confers resistance to unfavorable environmental conditions. Previous studies have suggested a role for AO as a regulator of oxygen content in photosynthetic tissues. For the first time we show here that the expression of a Lotus japonicus AO gene is induced in the symbiotic interaction with both nitrogen-fixing bacteria and arbuscular mycorrhizal (AM) fungi. In this framework, high AO expression is viewed as a possible strategy to down-regulate oxygen diffusion in root nodules, and a component of AM symbiosis. A general model of AO function in plants is discussed.

Copyright © 2012 Elsevier Masson SAS. All rights reserved.

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