Abstract
The inverse PCR technique was applied to clone genomic DNA flanking insertion sites of sequences homologous to the transposable element Fot1 in the genome of a new pathogenic isolate of Fusarium oxysporum obtained from wilted Argyranthemum frutescens (Paris daisy). Based on the genomic flanking regions, a primer was designed which when paired to a second primer matching the Fot1 sequence allowed detection of this pathogen by PCR. The primer pair Mg5/Mg6 could specifically identify nine tested isolates of F. oxysporum from A. frutescens, when fungal genomic DNA was used as template. Moreover, the primer pair Mg5/Mg6 allowed successful detection of the pathogen in stem and root tissue from asymptomatic plants that were artificially inoculated with a representative isolate of F. oxysporum from A. frutescens.
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