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Changes of genotype, sensitivity and aggressiveness in Phytophthora infestans isolates collected in European countries in 1997, 2006 and 2007

Gisi, U. and Walder, F. and Resheat-Eini, Z. and Edel, D. and Sierotzki, H.. (2011) Changes of genotype, sensitivity and aggressiveness in Phytophthora infestans isolates collected in European countries in 1997, 2006 and 2007. Journal of Phytopathology, 159 (4). pp. 223-232.

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Official URL: http://edoc.unibas.ch/46925/

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Abstract

A total of 241 isolates of Phytophthora infestans were collected in 1997, 2006 and 2007 in eight European countries and characterized with molecular markers (simple sequence repeats, SSR genotypes) and phenotypic traits such as sensitivity to fungicides, mating type and aggressiveness. The mating type distribution changed from mainly A1 in 1997 to a majority of A2 in 2007. No resistant isolates were detected for fluazinam and mandipropamid, whereas the proportion of isolates resistant to mefenoxam (MFX) was high and increased over the years. There was no genetic link between mating type and MFX resistance. Aggressiveness (product between lesion expansion and sporulation capacity) was slightly higher for MFX-resistant compared to sensitive isolates and for isolates collected later compared to earlier in the same season. It was about equally high for A1 and A2 types, and for French isolates in 1997 and British isolates in 2007, but lower for French isolates in 2007. Six different SSR genotype families were distinguished. In 1997, populations were dominated by genotype families I and III/IV, which significantly declined in 2007 being largely displaced by genotype families II ('blue 13' type) and V, which are by coincidence mainly A2 MFX resistant and A1 MFX sensitive, respectively. However, mating type and MFX resistance were genetically not linked to SSR genotypes.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Pflanzenphysiologie Pathogenabwehr (Boller)
UniBasel Contributors:Gisi, Ulrich and Walder, Florian
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Wiley
ISSN:0931-1785
e-ISSN:1439-0434
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Nov 2017 09:36
Deposited On:30 Nov 2017 09:36

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