FHB

Nicaise et al 22

Interaction entre l'accumulation de cadmium et la mycotoxine déoxynivalénol produite par Fusarium graminearum dans les grains de blé dur

Notre nouvel article en collaboration avec UMR ISPA présente les résultats du projet ANR CaDON

Le projet CaDON financé par l'ANR visait à comprendre les évènements de contamination croisée du Cadmium et et de la mycotoxine Deoxynivalenol dans les récoltes de blé dur, et à évaluer la toxicité du mélange. Voir vidéo CaDON

Les recherches présentées dans cet article sont le fruit de la collaboration entre notre groupe et l'UMR ISPA du centre de recherche INRAE Nouvelle Aquitaine - Bordeaux.

Nicaise V., Chereau S., Pinson-Gadais L., Verdal-Bonnin M.-N, Ducos C., Jimenez M., Coriou C., Bussière S., Robert T., Nguyen C., Richard-Forget F., Cornu J.-Y.(2022 )Interaction between the accumulation of cadmium and deoxynivalenol mycotoxin produced by Fusarium graminearum in durum wheat grains. Journal of Agricultural and Food Chemistry.   https://doi.org/10.1021/acs.jafc.2c01673

ABSTRACT: Durum wheat is one of the cereal crops that accumulates the highest concentrations of cadmium (Cd) and deoxynivalenol (DON) mycotoxin in its grains, thereby affecting the safety of products made of durum wheat grains (pasta and semolina). This study investigates in planta the interaction between Cd and Fusarium graminearum, the main causal agent of DONaccumulation in grains. A pot experiment was designed to characterize the response of durum wheat to F. graminearum infection at three levels of Cd exposure: 0.1, 2, and 10 mg Cd kg−1 soil, which showed that the accumulation of Cd and DON resulted from interacting processes. On the one hand, plant exposure to Cd reduced the concentration of DON in grains. The mitigating effect of Cd on DON accumulation was attributed to the restricted growth of F. graminearum, which could result from enhanced plant resistance to the fungal pathogen induced by Cd exposure. On the other hand, F. graminearum infection of durum wheat increased the Cd concentration in the grains. The promoting effect of Fusarium infection on Cd accumulation was attributed to decoupling of the allocation of Cd and photoassimilates to the grains and to the reduced strength of the grain sink for photoassimilates caused by the fungus. Provided that this result is confirmed in field conditions, it suggests that in Cd-contaminated soils, particular attention should be paid to agronomic practices that affect Fusarium head blight disease to avoid further increase in the risk of exceeding the regulatory limit set by the European Union for Cd in durum wheat.

Date de création : 24 juin 2022 | Rédaction : Communication MycSA