Cultivar Dependent Variation in Pathogen Resistance due to Tissue Culture-propagation of Strawberries

Abstract
Tissue culture-propagated (TC) strawberry plants (Fragaria × ananassa Duch.) had a cultivar-dependent shift in susceptibility to Phytophthora fragariae Hickman and Verticillium albo-atrum Reinke and Berthold root-rotting fungi. TC-propagated ‘Tribute’, a resistant cultivar, had a disease reaction similar to that of runner-propagated ‘Tribute’ plants. TC-propagated and juvenile selfed seedlings of ‘Raritan’, a susceptible cultivar, were more susceptible to these diseases than ‘Raritan’ runner plants. The TC plant disease reaction shifted toward the runner plant (or usual clonal) reaction with increasing time out of in vitro culture.

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