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24, chemin de Borde Rouge -Auzeville - CS52627 31326 Castanet Tolosan cedex - France

Last update: May 2021

Menu Logo Principal

PVY Organization

Zone de texte éditable et éditée


University of Helsinki (UoH)

Faculty of Agriculture and Forestry, University of Helsinki. The University of Helsinki is an international academic community with more than 40,000 students and members of staff. It operates on four campuses in Helsinki and in 9 other localities in Finland.


  • Molecular biology of potato and sweetpotato viruses
  • Virus resistance in potato
  • RNA silencing in plants
  • Suppression of virus resistance by viruses in plants
  • Virus diagnostics (including small-RNA based virus detection)
  • Vectors of potato viruses (aphids, Spongospora subterranea)


Jari Valkonen (Head of the team)


Tel.: +358294158387



  • Molecular biology
  • Greenhouse and field experiments
  • Methods of virus diagnostics
  • Collaboration with stakeholders in enhancing disease control in potato crops


Nber of people : 8

Selected publications

  • Kirchner, S.M., Hiltunen, L.H., Santala, J., Döring, T.F., Ketola, J., Kankaala, A., Virtanen, E. & Valkonen, J.P.T. 2014. Comparison of straw mulch, insecticides, mineral oil, and birch extract for control of transmission of Potato virus Y in seed potato crops. Potato Research 57:59-75.
  •  Rajamäki, M.L., Streng, J. & Valkonen, J.P.T. 2014. Silencing suppressor protein VPg of a potyvirus interacts with the plant antiviral defense protein SGS3. Molecular Plant-Microbe Interactions 27:1199–1210.
  • Tian, Y.P., Hepojoki, J., Ranki, H., Lankinen, H. & Valkonen J.P.T. 2014. Analysis of Potato virus Y coat protein epitopes recognized by three commercially available monoclonal antibodies. PLoS ONE 9: e115766.
  • Tian, Y.P. & Valkonen, J.P.T. 2015. Recombination of strain O segments to HCpro-encoding sequence of strain N of Potato virus Y modulates necrosis induced in tobacco and in potatoes carrying resistance genes Ny or Nc. Molecular Plant Pathology 16: 735–747.
  • Eck, H.J. van, Vos, P.G., Valkonen, J.P.T., Uitdewilligen, J.G.A.M.L., Lensing, H., De Vetten, N. & Visser, R. 2017. Graphical genotyping as a method to map the resistance genes Ny (o,n) and Gpa5 using a reference panel of tetraploid potato cultivars. Theoretical and Applied Genetics 130: 515-528.