Genetic diversity within the Albugo candida complex (Peronosporales, Oomycota) inferred from phylogenetic analysis of ITS rDNA and COX2 mtDNA sequences

Young Joon Choi, Seung Beom Hong, Hyeon Dong Shin

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Albugo candida is a destructive fungus infecting brassicaceous hosts. The genetic diversity within the A. candida complex from various host plants was investigated by sequence analysis of the internal transcribed spacer (ITS) region of rDNA and the cytochrome c oxidase subunit II (COX2) region of mtDNA. The aligned nucleotide sequences of A. candida shared significantly high distances, up to 20.4 and 8.9%, in two genes. The phylogenetic trees, obtained using the Bayesian method and maximum parsimony analysis, showed two separate groups that corresponded to the host genera. Group I included A. candida isolates infecting Arabis, Autrieta, Berteroa, Biscutella, Brassica, Cardaminopsis, Diplotaxis, Eruca, Erysimum, Heliophila, Iberis, Lunaria, Raphanus, Sinapis, Sisymbrium, and Thlaspi. Group II contained all isolates from Capsella, Descurainia, Diptychocarpus, Draba, and Lepidium. The genetic similarities between the two genes among isolates within Group I were 99.0-100% and 99.6-100%, while those within Group II were 90.4-100% and 91.1-100%, respectively, showing considerably lower values than for Group I. The A. candida isolates from Capsella bursa-pastoris in Korea are clearly separated by sequence analysis for the two genes compared to those from Wales, England, and the USA. Based on the molecular data from the two genes, we suggest the high degree of genetic diversity exhibited within A. candida complexes warrants their division into several distinct species.

Original languageEnglish
Pages (from-to)400-409
Number of pages10
JournalMolecular Phylogenetics and Evolution
Volume40
Issue number2
DOIs
Publication statusPublished - 2006 Aug

Keywords

  • Albugo
  • Brassicaceae
  • COX2 mtDNA
  • ITS rDNA
  • Species complex

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics

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