Morphological and molecular analyses support the existence of host-specific Peronospora species infecting Chenopodium

Young Joon Choi, Cvetomir M. Denchev, Hyeon Dong Shin

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


About 20 species of Peronospora have been reported to cause downy mildew on Chenopodium, but, particularly in plant pathology literature, only one species, P. farinosa, is considered to be involved. We performed sequence analysis of the ITS rDNA to reveal the phylogenetic relationships of Peronospora specimens from five species of Chenopodium, viz. C. album, C. ambrosioides, C. bonus-henricus, C. hybridum, and C. polyspermum. The five clades corresponded to particular Chenopodium species, and showed a high level of sequence divergence. Differences in the morphology of the conidia and ultimate branchlets also supported the separation of the five groups at the host species level. These results suggest that the names P. variabilis, P. boni-henrici, P. chenopodii, and P. chenopodii-polyspermi should be used for the four downy mildew pathogens specific to C. album, C. bonus-henricus, C. hybridum, and C. polyspermum, respectively. The Peronospora on C. ambrosioides was found to be an independent species.

Original languageEnglish
Pages (from-to)155-164
Number of pages10
Issue number3
Publication statusPublished - 2008 Mar

Bibliographical note

Funding Information:
Acknowledgments The authors are grateful to the Directors and Curators of herbaria BPI, BRNM, HAL, HMAS, SOMF, and UPS, for allowing access to specimens in their care, and to the staff of the Korean Agricultural Culture Collection for technical assistance with the DNA sequencing and phylogenetic analysis. This work was supported by the Korea Research Foundation and the Korean Federation of Science and Technology Societies Grant, founded by Korea Government (MOEHRD, Basic Research Promotion Fund).


  • Chenopodiaceae
  • Evolution
  • Host specificity
  • ITS rDNA
  • Phylogenetic analysis

ASJC Scopus subject areas

  • Microbiology
  • Applied Microbiology and Biotechnology
  • Agronomy and Crop Science
  • veterinary (miscalleneous)


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