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‘Candidatus Phytoplasma fragariae’, a novel phytoplasma taxon discovered in yellows diseased strawberry, Fragariaxananassa

¹ Laboratory of Phytoviruses, Institute of Botany, Zaliuju ezeru 49, Vilnius LT-08406, Lithuania
² USDA-ARS, Molecular Plant Pathology Laboratory, Beltsville, MD 20705, USA

Correspondence
Robert E. Davis
davisr{at}ba.ars.usda.gov

Symptoms of general stunting and yellowing of leaves were observed in diseased cultivated strawberry (Fragariaxananassa Duchesne) in Lithuania. Analysis of 16S rRNA gene sequences amplified by PCR indicated that the symptoms were associated with infection by a phytoplasma, designated strawberry yellows (StrawY) phytoplasma. Phylogenetic analysis of 16S rRNA gene sequences indicated that StrawY phytoplasma, ‘Candidatus Phytoplasma australiense’, ‘Candidatus Phytoplasma asteris’, stolbur phytoplasma and ‘Candidatus Phytoplasma japonicum’ shared a common ancestor, but were mutually distinct. Nucleotide sequence alignments of a 1·3 kb 16S rRNA gene sequence fragment revealed that StrawY phytoplasma shared 97·4 % or less similarity with previously described ‘Candidatus Phytoplasma’ species. These results, in addition to natural host and geographical occurrence, support the recognition of StrawY phytoplasma as a representative of a novel taxon, ‘Candidatus Phytoplasma fragariae’.

Published online ahead of print on 30 September 2005 as DOI 10.1099/ijs.0.63935-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of phytoplasma strain StrawY is DQ086423.

A supplementary table showing the unique regions in the 16S rRNA gene sequence of ‘Candidatus Phytoplasma fragariae’ compared with other ‘Candidatus Phytoplasma’ species is available in IJSEM Online.

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