Different pathotypes of the sunflower downy mildew pathogen Plasmopara halstedii all contain isometric virionsdagger.

ABSTRACT: Eight pathotypes of Plasmopara halstedii were screened to investigate the occurrence of virions and the potential viral influence on the pathogenicity of the sunflower downy mildew pathogen. In 23 of 26 P. halstedii isolates derived from eight countries in Europe, North America and South America, virions were detected by transmission electron microscopy. By contrast, there were no ultrastructural indications of virus-like particles in eight other related Oomycetes. The virions of representative P. halstedii isolates were morphologically and biochemically characterized and compared among each other. Regardless of their host's pathotypes, the geographical origin of the isolate and the sensitivity towards the fungicide metalaxyl, the viral characters obtained were uniform. The virions were is

SUBMITTER: Heller-Dohmen M 

PROVIDER: S-EPMC6640286 | biostudies-literature | 2008 Nov

REPOSITORIES: biostudies-literature