Abstract
SUMMARY We sought to identify Fusarium oxysporum f. sp. vasinfectum (Fov) genes that may be associated with pathogenicity. Initially we utilized microarray and Q-PCR technology to identify Fov genes expressed in root and hypocotyl tissues during a compatible infection of cotton. We identified 218 fungal clones representing 174 Fov non-redundant genes as expressed in planta. The majority of the expressed sequences were expressed in infected roots, with only six genes detected in hypocotyl tissue. The Fov genes identified were predominately of unknown function or associated with fungal growth and energy production. We then analysed the expression of the identified fungal genes in infected roots and in saprophytically grown mycelia and identified 11 genes preferentially expressed in plant tissue. A putative oxidoreductase gene (with homology to AtsC) was found to be highly preferentially expressed in planta. In Agrobacterium tumefaciens, AtsC is associated with virulence. Inoculation of a susceptible and a partially resistant cotton cultivar with either a pathogenic or a non-pathogenic isolate of Fov revealed that the expression of the Fov AtsC homologue was associated with pathogenicity and disease symptom formation.
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