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)

    Abstract

    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
    JournalMycopathologia
    Volume165
    Issue number3
    DOIs
    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).

    Keywords

    • 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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