engleski

Influence of grapevine leafroll-associated virus 3 on physiological indicators in grapevine

Grapevine leafroll disease (GLD) is one of the most significant grapevine viral diseases, and grapevine leafroll-associated virus 3 (GLRaV-3) is one of the main causes of this disease. The aim of this work was to investigate the effect of GLRaV-3 strains (genetic variants) on physiological parameters on three standard red cultivars Merlot, Cabernet Franc and Pinot Noir and an indigenous Croatian wine grape variety Tribidrag. Total soluble proteins, superoxide dismutase (SOD) activity, hydrogen peroxide, photosynthetic pigments and plant growth were evaluated following 6 and 18 months of inoculation with individual GLRaV-3 strains. The results showed different degree of sensitivity of the tested cultivars to the infection caused by GLRaV-3 strains. After 6 months, we determined that Tribidrag was the most susceptible to infection with GLRaV-3 compared to other cultivars (especially compared to Cabernet Franc and Pinot Noir). Longer infection (18 months) with GLRaV-3 strains singled out Merlot as the most sensitive grape variety as evidenced by decreased growth and photosynthetic pigments. Considering the relative scarcity of this type of research, findings obtained in this study can be used as a guideline for future studies of the impact of virus infections on grapevine.

Grapevine leafroll disease ; red wine varieties ; physiological indicators

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