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Campagnac E.,University of Lille Nord de France | Campagnac E.,Laboratoire Of Mycologie Phytopathologie Environnement | Sahraoui A.L.,University of Lille Nord de France | Sahraoui A.L.,Laboratoire Of Mycologie Phytopathologie Environnement | And 16 more authors.

The present work examined the oxidative stress induced by different concentrations (0. 02 and 0. 2 mg l-1) of two sterol biosynthesis inhibitor fungicides (fenpropimorph and fenhexamid) in non-target chicory root colonised or not by Glomus intraradices in a monoxenic system. The fungicides were found to cause oxidative damage by increasing lipid peroxidation measured by malondialdehyde production in non-colonised roots. Detoxification of the H2O2 product was measured at 0. 2 mg l-1 of fenpropimorph by an increase in peroxidase activities suggesting an antioxidant capacity in these roots. Moreover, this study pointed out the ability of arbuscular mycorrhiza to alleviate partially the oxidative stress in chicory roots, probably by lowering reactive oxygen species concentrations, resulting from increases in antioxidant defences. Our results suggest that the enhanced fungicide tolerance in the AM symbiosis could be related to less cell membrane damage. © 2009 Springer-Verlag. Source

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