A Fusarium population from banana missing the fumonisin gene cluster: a new species closely related to F. verticillioides

Van Hove, François;Waalwijk, Cees;González-Jaén, Maria-Teresa;Moretti, Antonio;Munaut, Françoise
(2008) 10th International Fusarium Workshop and Fusarium Genomics Workshop 2008 — Location: Alghero, Sardinia, Italy (30.August.2008)

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  • Van Hove, FrançoisUCLouvain
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  • Waalwijk, CeesPlant Research International, Wageningen, The Netherlands
    Author
  • González-Jaén, Maria-TeresaUniversity Complutense of Madrid, Spain
    Author
  • Moretti, AntonioInstitute of Sciences of Food Production, National Research Council, Bari, Italy
    Author
  • Munaut, FrançoiseUCLouvain
    Author
Abstract
Several strains of Fusarium isolated from banana were initially identified as F. verticillioides and described as non fumonisin producing strains. Here, we report preliminary results indicating that a sequence of 44 kb including the main part of the Fumonisin Gene Cluster (FGC) has been excised from these Fusarium strains. The excision hypothesis is supported by the fact that the 5’ end (756 bp) of the most proximal gene of the FGC (FUM21 that regulates FUM gene expression) and the 3’ end (902 bp) of the most distal gene of the FGC (FUM19 that encodes an ABC transporter) are still present in the genome of these strains. This result explains previous unfruitful attempts to amplify by PCR or reveal by southern blot hybridisation, the presence of several genes of the FGC in, as well as the non production of fumonisins by these banana strains. Molecular data analyses on tEF, ITS, 28S, calmodulin, beta-tubulin and mtSSU sequences we report here show significant variations with sequences from species of the Gibberella fujikuroi complex including F. verticillioides. Together with previous results of molecular studies (AFLP fingerprinting and tEF, mtSSU and IGS sequences), as well as with results of crossing experiments, pathogenicity tests and morphological characterization these new data indicate that these strains isolated from banana represent a new Fusarium species, which is closely related to F. verticillioides.
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Van Hove, F., Waalwijk, C., González-Jaén, M.-T., Moretti, A., & Munaut, F. (2008). A Fusarium population from banana missing the fumonisin gene cluster: a new species closely related to F. verticillioides. Journal of Plant Pathology : rivista di patologia vegetale, 90(3), 22. https://hdl.handle.net/2078.5/149686 (Original work published 2008)