Re-consideration of Peronospora farinosa infecting Spinacia oleracea as distinct species, Peronospora effusa

Young Joon Choi, Seung Beom Hong, Hyeon Dong Shin

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Downy mildew is probably the most widespread and potentially destructive global disease of spinach (Spinacia oleracea). The causal agent of downy mildew disease on various plants of Chenopodiaceae, including spinach, is regarded as a single species, Peronospora farinosa. In the present study, the ITS rDNA sequence and morphological data demonstrated that P. farinosa from S. oleracea is distinct from downy mildew of other chenopodiaceous hosts. Fifty-eight spinach specimens were collected or loaned from 17 countries of Asia, Europe, Oceania, North and South America, which all formed a distinct monophyletic group. No intercontinental genetic variation of the ITS rDNA within Peronospora accessions causing spinach downy mildew disease was found. Phylogenetic trees supported recognition of Peronospora from spinach as a separate species. Microscopic examination also revealed morphological differences between Peronospora specimens from Spinacia and P. farinosa s. lat. specimens from Atriplex, Bassia, Beta, and Chenopodium. Consequently, the name Peronospora effusa should be reinstated for the downy mildew fungus found on spinach. Here, a specimen of the original collections of Peronospora effusa is designated as lectotype.

Original languageEnglish
Pages (from-to)381-391
Number of pages11
JournalMycological Research
Volume111
Issue number4
DOIs
Publication statusPublished - 2007 Apr

Keywords

  • Chenopodiaceae
  • Downy mildew
  • ITS rDNA
  • Phylogenetic analysis
  • Spinach

ASJC Scopus subject areas

  • Biotechnology
  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Plant Science

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