Résistance partielle au phoma du tournesol : approche épidémiologique et mesure des composantes de résistance

Abstract : Sunflower black stem disease, caused by Phoma macdonaldii, is present in all French sunflower production areas. The use of resistant varieties represents a potential effective option for disease control, representing a cheap and environment-friendly option. Sunflower partial resistance to P. macdonaldii was observed in several genotypes; this feature could therefore be included in breeding programs. The methodology developed during the internship corresponds to an epidemiological approach to identify predictors of sunflower partial resistance to phoma in controlled conditions. The measurements of such epidemiological parameters of phoma resistance were done after inoculation on sunflower seedlings in phytotron. In controlled conditions, the components of sunflower partial resistance to phoma are the components of resistance to infection and colonization. Two predictors for partial resistance were identified and were associated to disease intensity at the beginning of epidemic in the field. Finally, no interaction between genotype of sunflower and strains of P. macdonaldii was detected for the different epidemiological parameters measured in this work.
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Master thesis
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http://docnum.univ-lorraine.fr/public/BUS_M_2014_LEPENNETIER_AURELIEN.pdf
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Aurélien Lepennetier. Résistance partielle au phoma du tournesol : approche épidémiologique et mesure des composantes de résistance. Sciences de l'environnement. 2015. ⟨hal-01828831⟩

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