Niger seed (Guizotia abyssinica), a new host of 'Candidatus Phytoplasma asteris' in Iran.

摘要

Shrubs of niger seed with phyllody and internode elongation symptoms suggestive of phytoplasma infections occurred in the central regions of Iran. Phytoplasma was detected by polymerase chain reaction (PCR) and nested PCR amplifications using phytoplasma universal primer pairs P1/P7 and R16F2n/R16R2. Using aster yellows group-specific primer pair rp(I)F1A/rp(I)R1A, a fragment of 1212bp of the rp genes was amplified from DNA samples of infected plants. Random fragment length polymorphism (RFLP) analyses of R16F2n/R16R2-amplified products using the CfoI restriction enzyme confirmed that Iranian niger seed phyllody phytoplasma is associated with aster yellows group phytoplasmas. Sequence analyses of the partial rp genes fragment indicated that the Iranian niger seed phyllody phytoplasma, which was collected from central regions of Iran, is related to 'Candidatus Phytoplasma asteris'. This is the first report of a phytoplasma infecting the niger seed plant.