作者: Miguel Montes-Borrego , Francisco J. Muñoz Ledesma , Rafael M. Jiménez-Díaz , Blanca B. Landa
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摘要: Montes-Borrego, M., Munoz Ledesma, F. J., Jimenez-Diaz, R. and Landa, B. 2009. A nested-polymerase chain reaction protocol for detection population biology studies of Peronospora arborescens, the downy mildew pathogen opium poppy, using herbarium specimens asymptomatic, fresh plant tissues. Phytopathology 99:73-81. sensitive (PCR) was developed either two primer pairs that improves in planta arborescens DNA. The new represented an increase sensitivity 100- to 1,000-fold oomycete poppy tissue compared with limit single PCR same pairs. allowed amplification 5 0.5 fg DNA mixed Papaver somniferum proved useful amplifying from 96-year-old spp. demonstrate systemic infections by can occur wild as well cultivated poppy. Also, made possible seedborne commercial seed stocks Spain a high frequency, which poses threat spread. Direct sequencing purified amplicons alignment internal transcribed spacer (ITS) ribosomal (rDNA) sequence up 730-bp long when combining sequences obtained sets. Maximum parsimony analysis amplified ITS rDNA dubium, P. hybridum, rhoeas, different countries indicated first time degree host specificity may exist within populations arborescens. reported will be epidemiological biogeographical diseases unravel misclassification cristata, causal agents disease.