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Abstract
Infection of plants by viruses can lead to a systemic or a localized infection. Systemic infections can produce protection against related viruses, as seen in the phenomenon of cross‐protection. The mechanisms thought to be involved are discussed. Localized infections also produce protection but against a wide range of unrelated pathogens, including bacteria and fungi. This involves an active response by the infected plants, switching on a number of different resistance mechanisms for the different types of pathogens. Research on these plant‐coded, induced proteins thought to be involved in resistance is discussed.