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We examined the usefulness of primer sets designed to amplify introns within conserved genes in filamentous ascomycetes to differentiate 35 isolates representing six different species of Fusarium commonly found in association with conifer seedlings. We analyzed restriction fragment length polymorphisms (RFLP) in five amplified PCR products from each Fusarium isolate. The primers used in this study were constructed on the basis of sequence information from the H3, H4, and (beta)-tubulin genes in Neurospora crassa. Primers previously developed for the intergenic transcribed spacer region of the ribosomal DNA were also used. The degree of interspecific polymorphism observed in the PCR products from the six Fusarium species allowed differentiation by a limited number of amplifications and restriction endonuclease digestions. The level of intraspecific RFLP variation in the five PCR products was low in both Fusarium proliferatum and F. avenaceum but was high in a population sample of F. oxysporum isolates. Clustering of the 35 isolates by statistical analyses gave similar dendrograms for H3, H4, and (beta)-tubulin RFLP analysis, but a dendrogram produced by intergenic transcribed spacer analysis varied in the placement of some F. oxysporum isolates.

Primer sets developed to amplify conserved genes from filamentous ascomycetes are useful in differentiating fusarium species associated with conifers