Plasmopara invertifolia sp. nov. causing downy mildew on Helichrysum bracteatum (Asteraceae)

Duarte, Lidiane Leal; Choi, Young-Joon; Soares, D. J.; Barreto, Robert W.

doi:10.1007/s11557-013-0913-7

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…Further detailed morphological studies are needed to assess whether the lineages found in this study can be differentiated based on phenotypic characters that characterize cryptic species within the P. halstedii complex. Our molecular data are in line with other molecular studies (see, e.g., Duarte et al, 2014; Rivera, Salgado‐Salazar, Windham, et al, 2016) supporting the suggestion of Novotel'nova (1966) that P. halstedii should be segregated into distinct species. However, without a molecular investigation of the type specimen of P. halstedii it cannot be concluded whether the name P. halstedii needs formal taxonomic action to keep it as a name for the causal agent of SDM.…”

Section: Discussionsupporting

confidence: 92%

Genetic structure of Plasmopara halstedii populations across Europe and South Russia

et al. 2022

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Plasmopara halstedii is a biotrophic parasite of sunflower (Helianthus annuus). We genetically analysed 162 P. halstedii samples collected between 1982 and 2018, representing a 3500 km west-east transect across Europe, from France to the Krasnodar region in southern Russia. To assess the population genetic structure among P. halstedii isolates, we sequenced two mitochondrial regions (cox1 and cox2), in addition to analysing eight polymorphic simple sequence repeat (SSR, microsatellite) markers.Sequencing of cox2 enabled comparison of our data with recent SSR-based studies to provide further evidence for differences among P. halstedii strains infecting different hosts (H. annuus, H. × laetiflorus, Rudbeckia spp.). There are two different lineages infecting H. annuus that we resolved on a neighbour-joining tree, which also corresponded to a discriminant analysis of principal components. This suggests at least two independent introductions of P. halstedii on sunflower. We observed no relationship between the phylogenetic placement of the individual samples and virulence characteristics, indicating independent evolution of virulence phenotypes. Both genetic markers clearly separated P. halstedii samples originating from H. annuus and H. × laetiflorus, suggesting these might represent distinct species.

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Section: Discussionsupporting

confidence: 92%

Genetic structure of Plasmopara halstedii populations across Europe and South Russia

et al. 2022

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“…Species of Plasmopara on Asteraceae can be defined by their host range and morphology under a phylogenetic species concept. This study confirms the hypothesis that species of downy mildew on Asteraceae show greater diversity than the broad concept applied to P. halstedii (Choi et al 2009;Constantinescu and Thines 2010;Duarte et al 2014;Spring et al 2003).…”

Section: Plasmopara Halstedii Kf927154supporting

confidence: 86%

“…Systematic studies based on nuclear rDNA and mitochondrial DNA have subsequently begun to delimit taxa in the P. halstedii species complex (Choi et al 2009;Constantinescu and Thines 2010;Duarte et al 2014;Spring et al 2003;Voglmayr and Constantinescu 2008;Voglmayr et al 2004). Species of Plasmopara on Asteraceae can be defined by their host range and morphology under a phylogenetic species concept.…”

Section: Plasmopara Halstedii Kf927154mentioning

confidence: 99%

Plasmopara sphagneticolae sp. nov. (Peronosporales) on Sphagneticola (Asteraceae) in Australia

McTaggart¹,

Shuey²,

McKenna³

et al. 2014

Australasian Plant Pathol.

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A specimen of downy mildew on leaves of Sphagneticola trilobata found in northern Queensland was identified by a systematic approach as a novel species of Plasmopara. A new species, Plasmopara sphagneticolae, is proposed for this specimen, which differs from other species of Plasmopara by morphology, host range, and sequence data from nuclear-ribosomal DNA and mitochondrial DNA. Plasmopara sphagneticolae, together with P. halstedii, are downy mildews found on host species in the tribe Heliantheae (Asteraceae). Plasmopara halstedii causes downy mildew on Helianthus annuus, and is not present on sunflower in Australia. Phylogenetic analysis of the large subunit region of ribosomal DNA showed that P. sphagneticolae was sister to P. halstedii on sunflower.

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“…exhibits a high degree of differentiation according to the host species [14]. In addition, it adds evidence to the recently re-appraised view that a narrow species concept reflects the evolutionary history of downy mildews much better than a broad species concept, as exemplified on other species complexes, such as the ones around Bremia lactucae [35][36][37][38][39][40][41], Hyaloperonospora parasitica [42][43][44][45][46][47][48], Peronospora farinosa [7][8][9]49], Peronospora lamii [12,13,50], and Plasmopara halstedii [24,26,[51][52][53]. The downy mildew of I. textori is one of the most common downy mildew diseases throughout South Korea [21] and is common in China [54,55] and Japan [56] where the host plant is also widely distributed.…”

Section: Discussionmentioning

confidence: 99%

Plasmopara elegantissima sp. nov. (Oomycota, Peronosporales), a Downy Mildew Species Specialized to Impatiens textori (Balsaminaceae)

et al. 2020

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Over the past 15 years, downy mildew became the most destructive foliar disease in cultivated Impatiens species (Balsaminaceae) worldwide. A previous study had revealed that the causal agent was not Plasmopara obducens (Oomycota, Peronosporales) but Plasmopara destructor on Impatiens walleriana, and Plasmopara velutina on Impatiens balsamina. This hints to a relatively high degree of specialization of Plasmopara on Balsaminaceae. Therefore, it was the aim of the present study to perform multigene phylogenetic analysis and detailed morphological investigation for several Korean downy mildew samples parasitic to cultivated I. walleriana, and I. balsamina, but also to a northeast Asian wild plant, Impatiens textori. It was revealed that I. textori harbors a new species, which is introduced and described here as Plasmopara elegantissima.

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Plasmopara invertifolia sp. nov. causing downy mildew on Helichrysum bracteatum (Asteraceae)

Cited by 7 publications

References 13 publications

Genetic structure of Plasmopara halstedii populations across Europe and South Russia

Genetic structure of Plasmopara halstedii populations across Europe and South Russia

Plasmopara sphagneticolae sp. nov. (Peronosporales) on Sphagneticola (Asteraceae) in Australia

Plasmopara elegantissima sp. nov. (Oomycota, Peronosporales), a Downy Mildew Species Specialized to Impatiens textori (Balsaminaceae)

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