The formation of insoluble wall bound proline-rich proteins (PRPs) and hydroxyproline- glycoproteins (HRGPs) in relation to the growth stage and developchanges was examined in red raspberry primocane cortex. Two cultivars _ Latham' and 'Malling Promise' - differing in growth intensity and in sensitivity to biotic stress were used for the experiments. The level of insoluble cell wall bound ,c the cortical tissues was almost similar in the course of the plants growth ; HRGPs were significantly higher at the end of the vegetation season (August r), especially in 'Malling Promise'. ,e plant sensitivity to biotic stress, based on the response to the fungus Didymella aplanata changed in the period of vegetative growth. At the end of summer the 'vars became more resistant. It has been inferred that the insolubilization of wall PRPs and HRGPs was responsible for the acquiring resistance to D. applanata by 'Malling. Promise', which was previously very susceptible to this fungus.
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