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Resistance in Solanum brevidens to both potato virus Y and potato virus X may be associated with slow cell-to-cell spread

J. P. T. Valkonen^1,

E. Pehu

M. G. K. Jones^1,>

R. W. Gibson^2,

¹ Department of Biochemistry and Physiology
and² Department of Plant Pathology, Institute of Arable Crops Research, Rothamsted Experimental Station, Harpenden, Hertfordshire AL5 2JQ, U.K.

A series of experiments was carried out to investigate the nature of the resistance of the wild potato species, Solanum brevidens, to potato virus X (PVX) and potato virus Y (PVY). In vitro inoculation of leaf protoplasts of S. brevidens and the virus-susceptible dihaploid S. tuberosum genotype PDH40 with PVX or PVY using polyethylene glycol showed that protoplasts of both species were similar in susceptibility. However, examination of protoplasts prepared from the leaves of S. tuberosum and S. brevidens inoculated 2 to 5 weeks earlier showed that the percentage of PVX- and PVY-infected leaf cells of S. tuberosum were, respectively, 45- to 100-fold and about 100-fold greater than the percentage of infected leaf cells of S. brevidens. These results suggest that resistance in S. brevidens to both PVX and PVY could be associated with slow cell-to-cell spread rather than with slow virus replication.

Present address: Department of Plant Pathology, Department of Plant Husbandry, University of Helsinki, 00710, Helsinki, Finland.

^> Present address: Plant Sciences, School of Biological and Environmental Sciences, Murdoch University, Perth, W. Australia 6150.

Present address: Natural Resources Institute, Chatham, Kent ME4 4TB, U.K.

Received 18 July 1990; accepted 29 October 1990.