OCCURRENCE OF ROSE DEGENERATION SYMPTOMS IN ROSE PLANTS IN POLAND; PRESUMED PHYTOPLASMAL AETIOLOGY OF ROSE PROLIFERATION AND DIEBACK
Stunted growth, bud proliferation, leaf and flower discoloration and malformations as well as dieback were observed during inspection of rose plantations on rose plants of 33 cultivars in 11 out of 16 inspected farms. The percentage of affected roses varied depending on a year, cultivar and farm. Very conspicuous symptoms were noticed in 8 rose farms. The severity of disease symptoms fluctuated and most of the symptomatic plants recovered in the following season or showed unclear symptoms. PCR-RFLP analysis revealed that in spite of differences in type and severity of symptoms, their incidence was associated with aster yellows phytoplasma (16SrI-B) infection. Additionally, plant of one rose cultivar was affected by phytoplasma classified to 16SrX-A group, while plants of another cultivar were infected with both 16SrI-B and 16SrX-A phytoplasmas. Sequence of 16S rDNA fragments of 16SrI-B phytoplasma from rose plants with shoot proliferation symptoms and those with dieback symptoms were nearly identical. Attempts to find clear relationships between temperature and light intensity and the development of rose degeneration symptoms failed.
Kaminska, M., Sliwa, H. and Malinowski, T. (2006). OCCURRENCE OF ROSE DEGENERATION SYMPTOMS IN ROSE PLANTS IN POLAND; PRESUMED PHYTOPLASMAL AETIOLOGY OF ROSE PROLIFERATION AND DIEBACK . Acta Hortic. 722, 163-174
rose, proliferation, dieback, aster yellows phytoplasma, apple proliferation phytoplasma, PCR, RFLP, sequencing