First report of Candidatus phytoplasma solani on blackberry (Rubus fruticosus) in Bulgaria.
2013
While performing a routine field survey on 2-year-old canes of Rubus fruticosus (cv. Evergreen Thornless) in the region of Plovdiv (central southern Bulgaria), severe stunting of single or grouped plants (3 to 4 in a row) was found in late August of 2009. It was noteworthy that the leaves of these plants were curved upwards and stayed green until the end of the season. The bushy aspect of the diseased plants led to the assumption of a phytoplasma origin; therefore, specific PCR and sequence based identification methods were applied on leaves, petioles, and stems from three infected Rubus plants grown in different rows of the field (midsummer, nine samples in total) and the same number of asymptomatic samples. Partial amplification of the 16S ribosomal RNA gene with generic phytoplasma primer pairs P1/P7 and fu5/ru3 (3), followed by a nested PCR specific for all members of the Phytoplasma stolbur subgroup by means of the stol11 primers (1), and an RFLP analysis of the tuf gene (elongation factor Tu) fragme...
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