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

Choi, Young Joon; Hong, Seung Beom; Shin, Hyeon Dong

doi:10.1016/j.ympev.2006.03.023

Cited by 53 publications

(43 citation statements)

References 22 publications

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“…This wide host range is exceptional for downy mildews, in which the commonly applied broad species concept has been refuted by several recent molecular phylogenetic studies (Göker et al , 2009García-Blázquez et al 2008;Choi et al 2007cChoi et al , 2009bThines et al 2009a). However, comparably broad host ranges have been reported for Pseudoperonospora cubensis (Choi et al 2005) and for Albugo candida (Voglmayr and Riethmüller 2006;Choi et al 2006Choi et al , 2007bChoi et al , 2008Choi et al , 2009aThines et al 2009b). The basis of host specificity versus broad host ranges remains obscure, but it can be expected that those pathogens with broad host ranges have effectors targeting pathways basal in pathogen defence networks that are highly conserved (for discussion see Thines et al 2009b).…”

Section: Discussionmentioning

confidence: 96%

Phylogenetic investigations in the downy mildew genus Bremia reveal several distinct lineages and a species with a presumably exceptional wide host range

et al. 2010

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Bremia lactucae is one of the most devastating and widespread pathogens in lettuce production worldwide. Despite its economical importance, uncertainty prevails about the species delimitation in the genus Bremia. Commonly, Bremia is considered to be monotypic, containing only Bremia lactucae, while taxonomists have described additional species, and molecular phylogenetic studies have shown significant sequence divergence between accessions from different hosts. Here, we report that several previously described species are genetically highly distinct from Bremia lactucae parasitic to Lactuca sativa. These include Bremia lapsanae, Bremia sonchicola, and Bremia taraxaci. In addition to these host-specific species, a plurivorous species is revealed, which infects hosts from three different tribes in the Asteraceae subfamilies Asteroideae and Carduoideae. The broad host range of clade 1 is exceptional for downy mildews and only paralleled by Pseudoperonospora cubensis, which infects a broad range of Cucurbitaceae. The taxonomic status of Bremia cirsii and of Bremia centaureae remains unresolved, as the accessions from Cirsium and Centaurea, respectively, did not form a monophylum but were partly contained in the plurivorous clade 1. Bremia lactucae was found to be restricted to Lactuca sativa and Lactuca serriola. Thus, it can be assumed that Bremia infections on weeds apart from Lactuca species do not pose a significant risk for lettuce production. However, it is unlikely that breeding resistance genes from Lactuca serriola into Lactuca sativa will result in durable resistance of lettuce to downy mildew disease, because the current study provides additional evidence that Bremia accessions from both hosts form a population continuum.

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Section: Discussionmentioning

confidence: 96%

Phylogenetic investigations in the downy mildew genus Bremia reveal several distinct lineages and a species with a presumably exceptional wide host range

et al. 2010

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“…Choi et al 2003Choi et al , 2005Choi et al , 2006Choi et al , 2007aVoglmayr 2003;Göker et al 2004;Scott et al 2004;Cunnington 2006;Spring et al 2006;Landa et al 2007;García Blázquez et al 2008). However, the mitochondrial cox2 region may also be a promising candidate to resolve species boundaries and for species identification (e.g.…”

Section: Impact Of Molecular Data On Downy Mildew Species Concept Andmentioning

confidence: 99%

“…However, the mitochondrial cox2 region may also be a promising candidate to resolve species boundaries and for species identification (e.g. Choi et al 2006Choi et al , 2007d. Interestingly, the current evidence from molecular phylogenetic investigations often supports a narrow species concept as advocated by Gäumann (1918Gäumann ( , 1923, although there are sometimes marked differences in detail.…”

Section: Impact Of Molecular Data On Downy Mildew Species Concept Andmentioning

confidence: 99%

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Progress and challenges in systematics of downy mildews and white blister rusts: new insights from genes and morphology

Voglmayr

2008

Eur J Plant Pathol

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Recent advances in the classification of downy mildews and white blister rusts are presented from ordinal to species level. Using molecular data (mainly LSU of nuclear ribosomal DNA and ITS rDNA data, but also cox2, beta-tubulin and NADH genes), ordinal, family and generic circumscriptions have been reconsidered and changed during the last years; species circumscription and concepts are also changing. These rearrangements also lead to a reevaluation of the traditional morphological characters used for classification. The recent changes have various implications for applied sciences (phytopathology, molecular biology) mainly at the species level; besides name changes for some taxa, revised species circumscriptions and improved species identification using genetic markers have important consequences on host ranges, source inocula and risk assessment of phytopathologically important taxa. However, there are also some substantial unresolved problems which need to be addressed in the future with new data and methods. These include the systematic position of some rarely sampled taxa, the phylogenetic relationships of the main downy mildew lineages to each other, more detailed molecular studies on speciation processes to develop appropriate sound species concepts and circumscriptions, and the development of a molecular bar coding system for downy mildews enabling reliable species identification. Applying molecular methods has the potential to greatly enhance our knowledge on the overall biodiversity of downy mildews.

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“…The amplification and sequencing of cox2 mtDNA and ITS rDNA were performed according to a method of Choi et al (2006), and the resulting sequences were deposited in GenBank (Acc. No.…”

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confidence: 99%

White Blister Rust Caused by Albugo candida on Oilseed Rape in Korea

Choi¹,

Park²,

Park³

et al. 2011

The Plant Pathology Journal

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

Cited by 53 publications

References 22 publications

Phylogenetic investigations in the downy mildew genus Bremia reveal several distinct lineages and a species with a presumably exceptional wide host range

Phylogenetic investigations in the downy mildew genus Bremia reveal several distinct lineages and a species with a presumably exceptional wide host range

Progress and challenges in systematics of downy mildews and white blister rusts: new insights from genes and morphology

White Blister Rust Caused by Albugo candida on Oilseed Rape in Korea

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