Peroxidases in the early response of potato (Solanum tuberosum L. cv. Igor) susceptible to potato virus YNTN = Peroksidaze v zgodnjem odgovoru dovzetne sorte krompirja (Solanum tuberosum L. cv. Igor) za krompirjev virus YNTN
Milavec, Mojca, 1972- ; Ravnikar, Maja ; Kovač, Maja, 1949-
In order to examine whether peroxidases (E.C. 1.11.1.7) are involved in the early response of highly susceptible potato (Solauum tuberosum L.) variety Igor to infection with potato virus YĆTĆ ...(PVYĆTĆ), their activities were studied during the first 24 hours following inoculation. Soluble, ionically- and covalently-bound peroxidases were analysed in bottom virus- or mock-inoculated leaves and in upper intact leaves as well as in roots. The effect of virus infection was observed already three hours after inoculation, when the activity of soluble and ionically-bound peroxidases decreased in inoculated bottom and upper intact leaves, while the activity of covalently-bound peroxidases increased. The most significant changes between mock and virus inoculated plants were found 24 hours after infection but only in bottom inoculated leaves when the increase of activity of all types of peroxidases was found. Infection had no effect on peroxidase actvities in roots. We can conclud that the observed changes of leaf peroxidases in infected plants contribute to early events in the compatible interaction of susceptible potato variety and PVYĆTĆ. Our results indicate that the changes of leaf peroxidases observed three hours after infection contribute to very early systemic response of susceptible potato variety to PVY"T", while the changes observed 21 hours later appears to be connected with the site of infection.
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