Abstract
Necrotic local lesions developed in cvs. Matilda, Ostara, Record, Satuma, Stina, Hankkija’s (Hjan) Tanu and Hjan Timo and local ring spots in Olympia and Sieglinde (Siikli) following sap inoculation with the ordinary strain of potato virus Y (PVY0). Secondarily infected cvs. Ostara, Pito, Siikli and Hjan Timo developed leaf drop. No infected progeny was produced by Matilda, Saturna and Hjan Tanu. In contrast, Bintje, Puikula and Sabina developed neither local lesions nor systemic necrosis, but showed mosaic symptoms following primary and secondary infection by PVYO. The ELISA absorbance values for potato leafroll virus (PLRV) in Ostara, Pito and Saturna were less than 10% of those in the PLRV-infected Siikli. The ELISA values for PLRV in Olympia, Stina, Hjan Tanu and Hjan Timo were not significantly different from those of Siikli. The severity of the symptoms did not correlate with the concentration of PLRV in the potatoes.
Highlights
Potato virus Y (PVY) and potato leaf roll virus (PLRV) are the economically most important viruses of potato (Solarium tuberosum L.) in Europe, causing yield losses of up to 80% (DeBokx and van der Want 1987)
Systemic mosaic symptoms without necrosis were observed in Bintje, Puikula and Sabina, while Ostara, Record, Hjan Tanu and Hjan Timo were free of any
The progeny of Matilda, Saturna, Stina and Hjan Tanu were free of symptoms and PVY° according to ELISA
Summary
Potato virus Y (PVY) and potato leaf roll virus (PLRV) are the economically most important viruses of potato (Solarium tuberosum L.) in Europe, causing yield losses of up to 80% (DeBokx and van der Want 1987). In Finland, the tobacco vein necrosis strain of PVY (PVY N ) seems to be dominating, whereas the ordinary strain of PVY (PVY°) is the one most commonly encountered in other parts of Europe (Kurppa 1983, De Bokx and van der Want 1987). The types of resistance to PVY are hypersensitivity and extreme resistance (ROSS 1986). Ross (1986) defined extreme resistance as intensified local hypersensitivity. We define extreme resistance as the type where the virus concentrationremains extremely low in an infected plant. The latter definition includes the type of resistance in which the multiplication of PVY is reduced (Barker and Harrison 1984), and the possibility that the low virus concentration in plant tissue is due to the inhibited cell-to-cell spread of the virus (Valkonen et al 1991)
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