Potato leafroll virus(PLRV) disease is a major threat to potato cultivation worldwide. PLRV disease resistant is sparce in potato varieties, but amply available in wild potato species. We aim to establish a catalog of resistant potato sources, including the involved R genes and their viral recognition specificity. This knowledge is essential, and will be implemented in ongoing breeding efforts, to generate resilient potato varieties for sustainable potato production worldwide.

o Identification of viral disease resistant potato sources
o Determine the specificity of the involved R genes to categorize the resistance sources
o Identification of corresponding viral R gene(s) and their resistance mechanism

Potato leafroll virus (PLRV) causes severe yield losses of ware and seed-potato production worldwide. PLRV is
persistently transmitted by aphids, and control of PLRV in potato currently depends on the use of virus free
potato seed stocks and/or the use of insecticides to control aphid infestation. The demand for PLVR resistant
potato varieties is rising due to increasing limitations in the use of insecticides and the increasing acreage of
organic potato production. But varieties and breeding material with PLRV resistance is still very limited or absent.

• Catalogue of potato varieties and Solanum accessions with distinct viral resistance
R gene donor plants
• Sibling populations for genetic analysis
Pre-breeding material.
Molecular markers to assist breeding
• Rationale to utilize resistance sources
R gene stacking
Integrated Crop Management (ICM)
• Knowledge about the evolution of PLRV recognition by the plant’s innate immune system.