Molecular and Ecological Studies of Fungal Biodiversity on Durum Wheat Grown in Rotation with Pulses and Canola
Fusarium species, known as the causal agent of Fusarium head blight (FHB) and Fusarium damaged kernels (FDK) were among the most ubiquitous and abundant in durum tissues. The most prevalent of all Fusarium at the study site were F. avenaceum, F. reticulatum, and F. tricinctum. Other recovered potential fungal pathogens belonged to the genera Bipolaris, Phaeosphaeria, Pyrenophora, Cladosporium, Epicoccum, Alternaria, Cladosporium, Arthrinium, Nigrospora, and Microdochium. Principal component analysis revealed negative correlations between Acremonium, Chaetomium, Penicillium, and pathogenic Fusarium, Bipolaris, Pyrenophora, and Alternaria. These isolates could be antagonistic, and their potential as biocontrol agents against pathogens colonizing durum wheat in the semiarid Saskatchewan should be assessed.
Crop rotation had a limited impact on the abundance of fungal pathogens. Fusarium torulosum was less abundant in durum following canola while Bipolaris sorokiniana was less abundant in durum following pea. Even if no single crop rotation reduced significantly the prevalence of F. avenaceum in durum wheat, results suggest that a successful control of this important pathogen requires an integrated approach using diversified rotations.
Advisor:Kaminskyj, Susan; Korber, Darren R.; Qiu, Xiao; Vujanovic, Vladimir; Chantal, Hamel
School:University of Saskatchewan
School Location:Canada - Saskatchewan
Source Type:Master's Thesis
Keywords:fusarium pyrenophora biodiverssity durum wheat
Date of Publication:07/23/2008