Characteristics of a Plasmopara angustiterminalis isolate from Xanthium strumarium

Komjáti, H.; Walcz, Ilona; Virányi, F.; Zipper, Reinhard; Thines, Marco; Spring, Otmar

doi:10.1007/s10658-007-9178-9

Cited by 22 publications

(16 citation statements)

References 19 publications

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“…Although the B. tulasnei specimens from Senecio vulgaris formed a distinct lineage within the plurivorous clade 1 with weak bootstrap support in ME and MP, and strong support in ML and BA, an extended sampling of specimens, multigene analyses, and cross-infection tests might be necessary for clarifying whether they are distinct from the other Bremia accessions contained clade 1. However, increased sampling and multigene analyses are preferable over cross-inoculation experiments, as for example Komjáti et al (2007) reported that Plasmopara angustiterminalis can infect some sunflower lines, albeit the pathogen is highly distinct from P. halstedii based on both morphological (Novotel'nova 1963) and molecular phylogenetic data , Komjáti et al 2007). For the Bremia clade 3, exclusively found on Cirsium, it is noteworthy that accessions from Cirsium arvense and Cirsium oleraceum are separated with weak support in ME and MP, moderate support in ML and high support in BA.…”

Section: Discussionmentioning

confidence: 99%

“…For the Bremia clade 3, exclusively found on Cirsium, it is noteworthy that accessions from Cirsium arvense and Cirsium oleraceum are separated with weak support in ME and MP, moderate support in ML and high support in BA. This could indicate some degree of host specialisation and genetic diversification on the various Cirsium species, which should be investigated by a more intense sampling of this group and by including additional genes with high phylogenetic resolution, like ITS (Choi et al 2007a;Thines 2007). Considering the results of Voglmayr et al (2004), it is likely that extended sampling from other hosts, investigated with highly variable genes, will reveal additional phylogenetically distinct lineages that should be considered independent species.…”

Section: Discussionmentioning

confidence: 99%

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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: 99%

Section: Discussionmentioning

confidence: 99%

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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“…However, the possibility that two potential pathogen species may infect the same host species cannot be the sole criterion for species rejection, as for both Hyaloperonospora (Göker et al 2009) and Plasmopara (Komjáti et al 2007) it is known that phylogenetically clearly distinct species are able to infect the same host species.…”

Section: A -Length Ofmentioning

confidence: 99%

Host matrix has major impact on the morphology of Pseudoperonospora cubensis

Runge

Thines

2010

Eur J Plant Pathol

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Oomycetes contain some of the economically most important pathogens of flowering plants. Most have a rather narrow host range, often being restricted to single host species. In downy mildews and other obligate biotrophic plant parasites, like powdery mildews and rusts, delimitating species on grounds of morphological characteristics is often hardly possible and thus often based on only subtle differences. This has led to the widespread application of a broad species concept for these organisms. Consequently, despite the fact that morphological differences were reported for Pseudoperonospora cubensis from different host species, the corresponding new pathogen species were not accepted as being independent, and the host range of Pseudoperonospora cubensis is reported to encompass more than 50 host species in the Cucurbitaceae in temperate to tropical climates. However, recent studies have reported narrow host ranges for other downy mildew genera and advocated a narrow species concept. Here, we report successful colonisation of five different tribes of the Cucurbitaceae by a strain of Pseudoperonospora cubensis and demonstrate that the host matrix has a major impact on the morphology of the pathogen. On the basis of five morphological criteria significant differences could be found for all hosts. These differences were more pronounced in phylogenetically unrelated than in related hosts. Our results provide evidence for a broad host range of Pseudoperonospora cubensis and demonstrate that species delimitation based on morphological characters is not feasible in Pseudoperonospora on Cucurbitaceae. Also in other biotrophic plant pathogens, the situation could be similar, thus necessitating thorough morphological, molecular phylogenetic and cross inoculation experiments for species recognition.

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“…Narrow species concepts such as those found in Novotelnova scorzonerae, Paraperonospora leptosperma, Plasmopara angustiterminalis or Plasmopara on Flaveria bidentis are supported by the new characters analysed (Spring et al 2003;Thines 2006;Komjati et al 2007;Voglmayr and Constantinescu 2008). In this context, recent studies on downy mildew of Xanthium strumarium (Komjáti et al 2007) in Hungary and on a naturalized population of the perennial sunflower hybrid Helianthus x laetiflorus (Spring et al 2003) revealed that the former is correctly classified as P. angustiterminalis Novotelnova while the latter was indistinct from downy mildew samples collected from annual oilseed sunflower. The fact that both isolates readily infected H. annuus seedlings when sporangia were used as inoculum is questioning Novotelnova's (1966) concept of differentiating specific forms of P. helianthi according to infection patterns on annual or perennial sunflower species.…”

Section: Introductionmentioning

confidence: 88%

Advances in sunflower downy mildew research

Virányi

Spring

2010

Eur J Plant Pathol

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This review summarises the progress in research on sunflower downy mildew as reported in publications of the past 10 to 15 years, the period since the last comprehensive review on Plasmopara halstedii. Particular attention is paid to subjects that showed much progress and may be of particular interest to sunflower pathologists, mycologists or molecular biologists. Accordingly, single sections are devoted to the problems of taxonomic and phylogenetic aspects, host specificity, the hostpathogen interaction including resistance phenomena, as well as epidemiology and disease management. Reflecting the progress achieved in some fields and illuminating the deficits in others should stimulate the reader's interest in this very significant pathosystem.

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Characteristics of a Plasmopara angustiterminalis isolate from Xanthium strumarium

Cited by 22 publications

References 19 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

Host matrix has major impact on the morphology of Pseudoperonospora cubensis

Advances in sunflower downy mildew research

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