A Relationship Between Immunity and Localized Reaction to Virus X in the Potato (Solanum Tuberosum)

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Abstract
The pattern of virus X development in the inoculated leaves of immune, localized-reacting, and susceptible phenotypes in the potato was studied. This immunity is not absolute. Phenotypes giving a localized reaction cannot be regarded as hypersensitive. The evidence shows that an inactivating system restricts the development of the virus as soon as infection takes place. All the results, including those from the X inoculation of 1st generation seedlings, raised from intercrosses between immune, localized-reacting, and susceptible phenotypes, indicate that a common virus-inactivating system determines resistance. The difference between localized resistance and immunity may be determined by different tetraploid conditions of a common major gene.

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