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Expression of Potato Virus X Resistance Gene Rx in Potato Leaf Protoplasts

Sally E. Adams

R. A. C. Jones

Department of Pure and Applied Biology, Imperial College of Science and Technology, Prince Consort Road, London SW7 2BB, U.K.

Protoplasts derived from shoot cultures of potato cv. Cara, which carries immunity gene Rx, supported only limited virus multiplication after inoculation with particles or RNA of isolate DX, a group 3 strain of potato virus X, as compared to similarly inoculated protoplasts of cultivars King Edward and Pentland Ivory which lack Rx. The Cara protoplasts were, however, able to support extensive replication of the resistance-breaking strain HB. This strain-specific resistance did not appear to be mediated by a failure or inhibition of the uncoating mechanism or of virus assembly.

Keywords: potato virus X, protoplasts, resistance, Rx gene

Present address: Department of Biochemistry, Oxford University, South Parks Road, Oxford OX1 3QU, U.K.

Present address: Plant Pathology Branch, Department of Agriculture, Baron-Hay Court, South Perth 6151, Western Australia.

Received 19 May 1986; accepted 1 August 1986.

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