Aggressiveness of Fusarium Head Blight Species towards Two Modern Syrian Wheat Cultivars in an in Vitro Petri-dish
Pathogenic variation was studied in 16 fungal isolates of four Fusarium head blight (FHB) species on two modern Syrian bread and durum wheat cultivars using an in vitro Petri-dish test. Three aggressiveness criteria: germination rate reduction, standardized area under disease progress curve (AUDPCstandard), and coleoptile length reduction were evaluated. Regarding AUDPCstandard, intra- and inter-species variability in aggressiveness was detected. The other two aggressiveness criteria did not distinguish fungal isolates within and among species. It seems that AUDPCstandard may be used to measure aggressiveness of FHB on wheat at early stages. The three aggressiveness parameters were not significantly correlated. Cultivar-specific aggressiveness has not been detected. It was not possible to cluster the isolates based on their species origins because of similarity in pathogenic level among the 16 fungal isolates. Bread wheat was more resistant to FHB infection than durum wheat in vitro. The two tested modern cultivars were shown to exhibit moderate to high FHB resistance levels.
Keywordsbread and durum wheat FHB variation Syrian wheat cultivars
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