Phylogenetic relationships of Albugo species (white blister rusts) based on LSU rDNA sequence and oospore data

Voglmayr, Hermann; Riethmüller, Alexandra

doi:10.1016/j.mycres.2005.09.013

Cited by 70 publications

(61 citation statements)

References 12 publications

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“…emphasised that different sporangial ornamentation types revealed by SEM were diagnostic for the Albugo clades revealed by molecular data, and segregated the two genera Wilsoniana (for species on Caryophyllidae) and Pustula (for species on Asteraceae). Voglmayr and Riethmüller (2006) confirmed the SEM data of and added detailed light microscopical and SEM data of the oospores, which were also shown to be diagnostic for the different molecular phylogenetic lineages of Albugo sensu lato. Constantinescu and Thines (2006) investigated and clarified sporangiogenesis in Albuginaceae; they confirmed the presence of sporangial dimorphism (primary and secondary sporangia) for all species investigated.…”

Section: Morphology Revisited: Shortcomings New Features and Interprsupporting

confidence: 70%

“…1b,c). Early origin of Albuginaceae is in line with high sequence divergence (Riethmüller et al 2002) and its unique conidial and oospore morphology (Riethmüller et al 2002;Hudspeth et al 2003;Voglmayr and Riethmüller 2006). Consequently, Hudspeth et al (2003) pleaded for exclusion of Albuginaceae from Peronosporales and for elevation to ordinal level, whereas created even a new subclass, Albuginomycetidae.…”

Section: General Considerations On Systematics and Taxonomymentioning

confidence: 99%

“…The results of the molecular phylogenetic investigations also stimulated reevaluation of the morphological features traditionally used for classification and the search for new, previously neglected characters (Spring and Thines 2004;Voglmayr et al 2004;Constantinescu et al 2005;Thines 2006;Voglmayr and Riethmüller 2006). Already Hall (1996) stressed the necessity of thorough morphological investigations, besides other methods, to obtain a more satisfactory classification.…”

Section: Morphology Revisited: Shortcomings New Features and Interprmentioning

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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Section: Morphology Revisited: Shortcomings New Features and Interprsupporting

confidence: 70%

Section: General Considerations On Systematics and Taxonomymentioning

confidence: 99%

Section: Morphology Revisited: Shortcomings New Features and Interprmentioning

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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“…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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“…Host specialization is a characteristic that corresponds with a high degree of speciation in fungus-like oomycetes that cause downy mildew and white rust diseases in a wide range of plant genera (Constantinescu and Fatehi 2002;Göker et al 2004;Riethmüller et al 2002;Voglmayr 2008;Voglmayr and Riethmüller 2006). Speciation of these plant parasites caught the attention of botanists before biology had been transformed by genetics (Lindau 1901;Gäumann 1918).…”

Section: Divergent Enquiry From Early Revolutions In Plant Sciencementioning

confidence: 99%

Natural history of Arabidopsis thaliana and oomycete symbioses

Holub

The Downy Mildews - Genetics, Molecular Biology and Control

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Molecular ecology of plant-microbe interactions has immediate significance for filling a gap in knowledge between the laboratory discipline of molecular biology and the largely theoretical discipline of evolutionary ecology. Somewhere in between lies conservation biology, aimed at protection of habitats and the diversity of species housed within them. A seemingly insignificant wildflower called Arabidopsis thaliana has an important contribution to make in this endeavour. It has already transformed botanical research with deepening understanding of molecular processes within the species and across the Plant Kingdom; and has begun to revolutionize plant breeding by providing an invaluable catalogue of gene sequences that can be used to design the most precise molecular markers attainable for markerassisted selection of valued traits. This review describes how A. thaliana and two of its natural biotrophic parasites could be seminal as a model for exploring the biogeography and molecular ecology of plant-microbe interactions, and specifically, for testing hypotheses proposed from the geographic mosaic theory of co-evolution.

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Phylogenetic relationships of Albugo species (white blister rusts) based on LSU rDNA sequence and oospore data

Cited by 70 publications

References 12 publications

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

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

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

Natural history of Arabidopsis thaliana and oomycete symbioses

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