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Hungarian isolates of Grapevine leafroll associated virus 1 and 3 (GLRaV-1, GLRaV-3) were tested using serological (DAS-ELISA) and molecular (RT-PCR) methods. Five hundred bp long PCR products of the part of HSP70 gene of one serologically positive GLRaV-1 and four GLRaV-3 isolates were sequenced. These sequences were applied for phylogenetic analysis and compared to foreign virus isolates of NCBI GenBank. Phylogenetic analysis of GLRaV-1 HSP70 gene supported the earlier results that it could be divided into two clusters: E and A. The Hungarian isolate 6.4.1 belonged to the group E. This isolate showed the highest homology with the AY754914 isolate from the Czech Republic. GLRaV-3 sequence data could cluster five groups. Hungarian 2.2; 3.5 and 4.2 isolates were estimated belonging to the group II. The 1.4 isolate from the same vineyard as 2.2 varied in sequence data so it belonged to the other, IV. variant group with two South African, two Austrian and a Syrah isolate. According to the phylogenetic analysis, two variant groups occurred in Hungary. These isolates related with each other, but showed higher similarity of foreign counties. In some cases, they were similar to isolates of the neighbour countries such as Slovakia and Austria. It could be supposed that mainly the exchange of virus infected propagation materials caused the dissemination of GLRaV isolates.

american journal of plant sciences

Rt-PCR Analysis and Evolutionary Relationship of Some Hungarian &amp;lt;i&amp;gt;Grapevine leafroll associated virus&amp;lt;/i&amp;gt; 1 and 3 Isolates