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Identifikace a sekvenování genomu nového viru infikujícího vojtěšku
BEČKOVÁ, Martina
Samples of lucerne plants characteristic with local necrosic lesions, leave malformation and yellow spots on leaves were investigated with transmission electron microscopy. Virus particles observed there were filamentous ones of 600 to 700 nm long. Nucleic acid was isolated, transcribed and amplified using PCR. Genus-specific primers were designed based on reverse genetics from the highly conserved genes for carlaviruses, potexviruses and potyviruses. Successful amplification with carlavirus-specific primers, sequencing and comparison with sequences in GenBank database revealed presence of a carlavirus. This was later identified by nucleotide sequence comparison as a new isolate V4 of Alfalfa latent virus. Specific primers for isolate V4 were designed in a coat protein position. Half of the genom of this virus was obtained with PCR and PCR modified amplifications and compared with sequences of Alfalfa latent virus and Pea streak virus from GenBank.

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