Morphological and molecular discrimination among Albugo Candida materials infecting Capsella bursa-pastoris world-wide

Young Joon Choi, Hyeon-Dong Shin, Seung Beom Hong, Marco Thines

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Abstract

The genus Albugo with A. Candida as the type species causes white blister rust disease in economically important crops. Recently, molecular approaches revealed the high degree of genetic diversity exhibited within A. Candida complex. However, before any taxonomic division of the complex at the species level, the correct status of A. Candida on Capsella bursapastoris, from which it was originally described, should be determined. A worldwide study of white rust pathogens on C. bursa-pastoris was performed on 36 specimens, using morphological analysis and sequence analysis from the cytochrome c oxidase subunit II (COX2) region of mtDNA, the internal transcribed spacer (ITS) region of the rDNA, and D1 and D2 regions of the nrDNA. Specimens were obtained from Asia (India, Korea, Palestine), Europe (England, Finland, Germany, Hungary, Ireland, Latvia, Netherlands, Romania, Russia, Sweden, Switzerland), North and South America (Argentina, Canada, USA), and Oceania (Australia). The molecular data indicated strong support for a species partition separating Korean and other continental specimens. There were 7.25, 17.4, and 4.8% sequence dissimilarity between the two groups in COX2, ITS, and 28S regions, respectively. The surface ornamentation of oospores of Korean specimens was morphologically distinguished from previously known characteristics of A. Candida. Therefore, Albugo koreana sp. nov., collected from C. bursa-pastoris in Korea, is described here. The concept of A. Candida sensu stricto is discussed and a type specimen determined for this species.

Original languageEnglish
Pages (from-to)11-34
Number of pages24
JournalFungal Diversity
Volume27 I
Publication statusPublished - 2007 Oct 31

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Keywords

  • Albugo koreana sp. nov.
  • COX2 mtDNA
  • ITS rDNA
  • Taxonomy
  • White blister rust

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Ecology
  • Plant Science

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