Comparative genomics of Fusarium oxysporum f. sp. melonis reveals the secreted protein recognized by the Fom-2 resistance gene in melon

Sarah Maria Schmidt, Joanna Lukasiewicz, Rhys Farrer, Peter Dam, Chiara Bertoldo, Martijn Rep (Corresponding Author)

Research output: Contribution to journalArticle

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Summary Development of resistant crops is the most effective way to control plant diseases to safeguard food and feed production. Disease resistance is commonly based on resistance genes, which generally mediate the recognition of small proteins secreted by invading pathogens. These proteins secreted by pathogens are called ?avirulence? proteins. Their identification is important for being able to assess the usefulness and durability of resistance genes in agricultural settings. We have used genome sequencing of a set of strains of the melon wilt fungus Fusarium oxysporum f. sp. melonis (Fom), bioinformatics-based genome comparison and genetic transformation of the fungus to identify AVRFOM2, the gene that encodes the avirulence protein recognized by the melon Fom-2 gene. Both an unbiased and a candidate gene approach identified a single candidate for the AVRFOM2 gene. Genetic complementation of AVRFOM2 in three different race 2 isolates resulted in resistance of Fom-2-harbouring melon cultivars. AvrFom2 is a small, secreted protein with two cysteine residues and weak similarity to secreted proteins of other fungi. The identification of AVRFOM2 will not only be helpful to select melon cultivars to avoid melon Fusarium wilt, but also to monitor how quickly a Fom population can adapt to deployment of Fom-2-containing cultivars in the field.
Original languageEnglish
Pages (from-to)307-318
Number of pages12
JournalNew Phytologist
Issue number1
Early online date25 Aug 2015
Publication statusPublished - Jan 2016



  • virulence gene
  • comparative genomics
  • Fusarium oxysporum f. sp. Melonis
  • gene-for-gene interaction
  • melon Fom-2 resistance gene

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