Gnomoniopsis smithogilvyi causes chestnut canker symptoms in Castanea sativa shoots in Switzerland

Fungal Genetics and Biology : FG & B
Sabrina PascheFrançois Lefort

Abstract

A screening of Castanea sativa scions for grafting for the presence of endophytes showed that the opportunistic fungal pathogen Gnomoniopsis smithogilvyi was the most abundant member of the endophytic flora. This fungus is known as a pathogen affecting chestnut fruits in Italy and Australia. Here, we present evidence that it causes cankers very similar to the ones due to Cryphonectria parasitica infection on twigs and scions of chestnut trees. We found natural infections of G. smithogilvyi in healthy grafted plants as well as in scions from chestnut trees. The identity of the fungus isolated from asymptomatic tissues was verified by applying Koch's postulates and corroborated by DNA sequencing of four different gene regions. In contrast to C. parasitica that appears on the bark as yellow to orange pycnidia, stromata and slimy twisted tendrils, G. smithogilvyi forms orange to red and black pycnidia, gray stromata and cream-colored to beige slimy twisted tendrils on the bark. These Swiss strains are closely related to G. smithogilvyi strains from Australia and from New Zealand, Gnomoniopsis sp. and Gnomoniopsis castanea from New Zealand, Italy, France and Switzerland. While the strains from Ticino are genetically very close to G....Continue Reading

References

Feb 1, 1961·The Journal of Biophysical and Biochemical Cytology·J H LUFT
Jul 31, 2004·Annual Review of Phytopathology·Michael G Milgroom, Paolo Cortesi
Jan 1, 2008·Studies in Mycology·M V SogonovJ F White
Oct 30, 2012·Persoonia·P W CrousJ Z Groenewald

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