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The population of Phoma lingam associated with blackleg disease of canola (Brassica napus) is highly polymorphic, and infect various Brassicaceae species, including Thlaspi arvense (stinkweed). In order to determine the population composition and pathogenicity of P. lingam infecting T. arvense, 18 isolates recovered from T. arvense (designated ‘Thl’ isolates) from different crop fields of Saskatchewan were compared with an aggressive (IBCN 2) and eleven less/non-aggressive reference strains. No common morphological, biochemical and pathogenic characteristics were found between ‘Thl’ isolates and IBCN 2 strain. DNA fingerprinting and phylogenetic analysis of ITS-rRNA gene sequences revealed that the ‘Thl’ P. lingam population of Saskatchewan is highly heterogeneous and comprised of at least eight genotypes. Over 50 percentage of ‘Thl’ isolates clustered with different less/non aggressive reference strains belonging to L. biglobosa. Interestingly, a group of’ Thl’ isolates clustered with an aggressive reference strain, IBCN 2. Therefore, regular monitoring is required to determine if the ‘Thl’ P. lingam population of western Canadian provinces is migrating from non-aggressive toward aggressive state.

Phenotypic, Biochemical and Molecular Diversity of Phoma lingam Fungal Isolates Collected from Saskatchewan, Canada