Etude de l'importance des différents types de résidus quant à leur contribution dans les contaminations par Fusarium spp. et Microdochium spp. sur épis de blé tendre

Abstract : Wheat suffers from a disease called « Fusarium ear blight » or « Fusarium head blight », caused by pathogenic fungi from the Fusarium and Microdochium genus. Attack of this culture by these pathogens generates severe yield losses but also a decrease of the harvest quality due to the production of mycotoxins, mainly the deoxynivalenol. The main inoculum source of the disease has been identified as residues of previous crops. In fact residues allow fungal conservation and next spring ascospores and/or conidia production. The aim of this study is to characterize different types of residues on their contributions to wheat ears contamination by Fusarium spp. and Microdochium spp. A micro-plots experiment is set up to simulate different previous crops. Two different approaches, by microbiology and molecular biology, are used to assess fungal pathogens quantities in crop residues samples Nevertheless, low initial contamination of crop residues and spring drought did not allow wheat ears contamination. Thus an important Microdochium spp. contamination, exogenous to crop residues, occurred and allowed FHB generalization in the whole trial. But this first trial gives us new ideas and improvement ways for the next two years of experiment.
Document type :
Master thesis
File URL :
http://docnum.univ-lorraine.fr/prive/SCDSCI_M_2011_JACQUIN_TRISTAN.pdf
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https://hal.univ-lorraine.fr/hal-01788464
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Submitted on : Wednesday, May 9, 2018 - 9:55:54 AM
Last modification on : Friday, September 14, 2018 - 1:01:45 AM

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Tristan Jacquin. Etude de l'importance des différents types de résidus quant à leur contribution dans les contaminations par Fusarium spp. et Microdochium spp. sur épis de blé tendre. Sciences de l'environnement. 2011. ⟨hal-01788464⟩

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