Morphological and Molecular Analyses Support the Existence of Host-specific Peronospora Species Infecting Chenopodium

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 Peronospor...

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Bibliographic Details
Published in:Mycopathologia (1975) 2008-03, Vol.165 (3), p.155-164
Main Authors: Choi, Young-Joon, Denchev, Cvetomir M, Shin, Hyeon-Dong
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Chenopodium
Chenopodium - microbiology
Cluster Analysis
DNA, Fungal - chemistry
DNA, Fungal - genetics
DNA, Ribosomal Spacer - chemistry
DNA, Ribosomal Spacer - genetics
Eukaryotic Microbiology
Life Sciences
Medical Microbiology
Microbial Ecology
Microbiology
Morphology
Pathogens
Peronospora
Peronospora - classification
Peronospora - cytology
Peronospora - genetics
Peronospora - isolation & purification
Phylogenetics
Phylogeny
Plant Sciences
Science
Sequence Analysis, DNA
Sequence Homology, Nucleic Acid
Spores, Fungal - cytology
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Summary: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.
ISSN:0301-486X
1573-0832
DOI:10.1007/s11046-007-9087-7