Primeiro relato de Plasmopara halstedii em Ageratum houstonianum (Asteraceae) no Distrito Federal, Brasil

Mattos, Jean Kleber de Abreu; Pio, Bruno Luiz de Assis; Gouveia, Janete; Inácio, C. A.; Dianese, J. C.

doi:10.1590/s0100-41582006000400017

Cited by 3 publications

(2 citation statements)

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“…Ph sensu lato (Choi et al, 2009a) represents a morphologically well-characterized organism capable of infecting more than 80 species of the Asteraceae family (Gulya et al, 1997). Infections of Ph were described for hosts other than H. annuus, such as invasive Ambrosia artemisiifolia (Walcz et al, 2000;Vajna, 2002), Iva xanthifolia (Gulya, 2002a), Ageratum houstonianum (Mattos et al, 2006), cultivated Rudbeckia fulgida 'Goldsturm' (Dankers et al, 2004;Hong, 2006;Rivera et al, 2014) and R. fulgida var. speciosa (Rivera et al, 2015), cultivated Coreopsis lanceolata (Choi et al, 2009b) or perennial sunflower Helianthus 9 laetiflorus (Spring et al, 2003).…”

Section: Characteristics Of the Pathosystem H Annuus-p Halstediimentioning

confidence: 99%

Methodology of virulence screening and race characterization of Plasmopara halstedii, and resistance evaluation in sunflower – a review

et al. 2016

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Sunflower downy mildew is a disease of high global economic impact as well as a causal agent that is extremely difficult to eradicate. During the past decades, several approaches for the determination of Plasmopara halstedii (Ph) races have been used worldwide and are discussed in this review. Procedures of isolation, cultivation and maintenance of Ph isolates, as well as the screening of sunflower for resistance, are also critically reviewed. The predominant, globally used resistance screening protocol is a ‘whole seedling immersion’ inoculation. ‘Soil drench’ inoculation allows more precise control of the number of Ph zoosporangia applied to a single sunflower seedling. A detached leaf assay has been described, but it has been used mainly for Ph subcultivation and fungicide tests. For race determination, a differential set consisting of nine sunflower genotypes has been used since 1988, coupled with a numerical triplet code for virulence phenotyping of Ph. The increasing variability in global Ph populations has demonstrated the inadequacy of the current set of differentials, and several researchers have proposed additional public lines as new differentials. Furthermore, bulk isolates may show different results in repeated tests, as Ph may contain genetically distinct zoospores within a single zoosporangium. For precise race determination, single zoosporangia or single zoospore isolates are advisable. However, due to low success of isolation, approximately 1–2%, this method cannot be applied in routine Ph race screening. Methods surveyed in this review have a broad spectrum of applications, including taxonomic studies.

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Section: Characteristics Of the Pathosystem H Annuus-p Halstediimentioning

confidence: 99%

Methodology of virulence screening and race characterization of Plasmopara halstedii, and resistance evaluation in sunflower – a review

et al. 2016

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“…It is not known whether P. sphagneticolae is the same species reported as P. halstedii on Sphagneticola from its natural host range in America (Mattos et al 2006). …”

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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First Report of Downy Mildew Caused by Plasmopara halstedii on Ageratum houstonianum in the United States

et al. 2019

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Primeiro relato de Plasmopara halstedii em Ageratum houstonianum (Asteraceae) no Distrito Federal, Brasil

Cited by 3 publications

References 0 publications

Methodology of virulence screening and race characterization of Plasmopara halstedii, and resistance evaluation in sunflower – a review

Methodology of virulence screening and race characterization of Plasmopara halstedii, and resistance evaluation in sunflower – a review

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

First Report of Downy Mildew Caused by Plasmopara halstedii on Ageratum houstonianum in the United States

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