engleski

The biological response of different grapevine varieties to virus infection

Grapevine viruses pose a significant threat to vineyard production by causing damaging effects on plants’ vital processes. Research related to grapevine response to the viruses is still largely unknown. The main objective of the study was to determine changes in vines as a consequence of plant-virus interaction. We initiated this kind of interaction, by graft-inoculating susceptible grapevine varieties (Cabernet Franc, Merlot, Pinot Noir) with different virus inoculums which necessarily contained grapevine leafroll- associated virus 3 (GLRaV-3) in coinfections with other economically important viruses. A Croatian autochthonous variety Tribidrag was also included in the experiment. Morphological, biochemical and physiological parameters related to primary metabolism, nutritive status and oxidative stress were determined. Six months post inoculation, significant differences in measured parameters were found between healthy control plants and those infected, in all varieties except Cabernet Franc. Plant response within each variety varied depending on virus inoculum composition. Data analysis pointed out the varietal specificity in some responses and necessity to observe each variety separately. Finally, parameters as superoxide-dismutase, hydrogen-peroxide, soluble proteins and Fe were changed in all varieties as some kind of common indicators of virus infection. The results obtained in this study enable a better understanding of the virus pathogenicity in grapevine and can be interpreted on three levels: (i) different variety responses to virus infection (ii) specific intravarietal responses in relation to virus composition, (iii) specific physiological parameters are found to potentially serve as general indicators of the studied interaction irrespective of the virus composition or of the grapevine variety.

grapevine viruses ; plant-virus interaction ; oxidative stress

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