Report of recombinant strains of potato virus Y (PVY) in Georgian potato seeds
2016
This is a report of recombinant variants of Potato Virus Y (PVY) from the potato cultivating regions of Georgia: Akhaltsikhe, Akhalkalaki, Marneuli. It is important to know which PVY recombinant strains are present, and if the verities circulating in the country confer any resistance to them. The most prevalent strains were PVYNWi - 89%, followed by PVYN -11%. We could not detect any infection with PVYNTN, PVYNA-NTN and PVYO. This finding is congruent with research papers stating that PVYNWi is found to be most prevalent in Europe. Total PVY infection of potato seeds accounted 63%, which exceeds any certification limits in the world. The highest incidence of PVY was observed for Akhaltsikhe - 78%, followed by Marneuli - 61 % and Akhalkalaki- 50%. According to chi-squared analyses, Akhalkalaki region had a significantly lower number of PVY infection (P<0.05) compared to both other regions. This might be attributed to the higher altitude of the growing area. The rate of infection in Georgia is significantly higher than the certification standard of EU (9% with high PVY infection). Furthermore, there was no significant difference (P>0.05) of PVY infection between cultivars rated as PVY-resistant and non-resistant, demonstrating the cultivars in the country are not recombinant strain resistant. Widely used varieties Desiree and Spunta formerly were reputed to be well resistant to PVY, but, today these cultivars are counted as sensitive to new recombinant strains such as PVYNTN or PVYNWi.
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