Abstract
AbstractPrickly ash trees with shortened internodes, proliferation of shoots, phyllody and witches' brooms were observed for the first time in Korea. A phytoplasma was detected in infected trees by polymerase chain reaction amplification of 16S rDNA, 16S–23S intergenic spacer region and the fragment of rp operon sequences. The 16S rDNA sequences exhibited maximum (99.6%) similarity with Iranian lettuce phytoplasma, and the sequences of rp operon exhibited maximum (100%) similarity with golden rain phytoplasma. Based on the sequence analysis and phylogenetic studies, it was confirmed that phytoplasma infecting prickly ash trees in Korea belongs to the aster yellows group (subgroup 16SrI‐B).
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