Mitochondrial phylogeny reveals intraspecific variation in Peronospora effusa, the spinach downy mildew pathogen

Young Joon Choi, Marco Thines, Jae Gu Han, Hyeon-Dong Shin

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Since about two hundred years, downy mildew caused by Peronospora effusa is probably the most economically important disease of spinach (Spinacia oleracea). However, there is no information on the global phylogeographic structure of the pathogen and thus it is unclear whether a single genotype occurs worldwide or whether some local genetic variation exists. To investigate the genetic variability of this pathogen, a sequence analysis of two partial mitochondrial DNA genes, cox2 and nad1, was carried out. Thirty-three specimens of Peronospora effusa from four continents were analyzed, including samples from Australia, China, Japan, Korea, Mexico, Russia, Sweden, and the USA. Despite the potential anthropogenic admixture of genotypes, a phylogeographic pattern was observed, which corresponds to two major groups, an Asian/Oceanian clade and another group, which includes American/European specimens. Notably, two of six Japanese specimens investigated did not belong to the Asian/Oceanian clade, but were identical to three of the specimens from the USA, suggestive of a recent introduction from the USA to Japan. As similar introduction events may be occurring as a result of the globalised trade with plant and seed material, a better knowledge of the phylogeographic distribution of pathogens is highly warranted for food security purposes.

Original languageEnglish
Pages (from-to)1039-1043
Number of pages5
JournalJournal of Microbiology
Volume49
Issue number6
DOIs
Publication statusPublished - 2011 Dec 1

Keywords

  • obligate parasites
  • Oomycetes
  • phylogeographic distribution
  • plant pathogen
  • quarantine

ASJC Scopus subject areas

  • Microbiology
  • Applied Microbiology and Biotechnology

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