Infection of Pythium and Phytophthora species by Olpidiopsis gracilis (Oomycetes)

Pemberton, Catherine M.; Davey, Robert A.; Webster, John; Dick, M.W.; Clark, Gillian

doi:10.1016/s0953-7562(09)81337-3

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…Originalmente, O. gracilis foi observado parasitando Pythium intermedium. Em teste de variedade de hospedeiros, Pemberton et al (1990) observaram que vinte espécies de Pythium e duas de Phytophthora foram infectadas por O. gracilis, ampliando consideravelmente a gama de oomicetos hospedeiros do parasita. Observando que, enquanto não se suprir novas descrições com dados genéticos moleculares além dos dados morfológicos (e ecológicos), o que não foi possível neste estudo, é prudente evitar novas descrições fundamentadas apenas em correlações morfológicas com as espécies já descritas e seus hospedeiros conhecidos, como ressaltado por Sekimoto et al (2009);Fletcher et al (2015); Klochkova et al (2016) e Kwak et al (2017).…”

Section: Olpidiopsis Sp1unclassified

O gênero Olpidiopsis (Oomycota) no Nordeste do Brasil

et al. 2018

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Resumo Estudos sobre a diversidade de oomicetos foram realizados de 1998 a 2016, na Bahia, Maranhão e Piauí, e parasitas biotróficos holocárpicos zoospóricos de quitrídias, glomeromicetos e oomicetos foram identificados como Olpidiopsis achlyae, O. aphanomycis, O. fusiformis, O. karlingae, Olpidiopsis sp1 e Olpidiopsis sp2. A ocorrência de O. karlingae é novo relato para a América do Sul e de O. aphanomycis, para o Brasil. Os táxons encontrados foram descritos, ilustrados e comentados. A diversidade de termos da literatura especializada para identificação das estruturas morfológicas de Olpidiopsis foi padronizada. São propostas as sinonímias de O. braziliensis (= Pseudolpidium achlyae) com O. fusiformis e de Cornumyces karlingae com O. karlingae.

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Section: Olpidiopsis Sp1unclassified

O gênero Olpidiopsis (Oomycota) no Nordeste do Brasil

et al. 2018

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“…(CaIman, Tewari & Mugala, 1986;Srobarova & Eged, 1992), Pythium spp. (Gugel et al, 1987;Pemberton et al, 1990;Huanget al, 1992;Bartlett & Martin, 1995) and Rhizoctonia spp. (Yitbarek et al, 1988;Kataria & Verma, 1992;Khangura, Barbetti & Sweetingham, 1999;Auret, lanse Van Rensburg & Lamprecht, unpublished report to Protein Research Foundation, 2002) and leaf feeding insects like the red legged earth mite (Halotydeus destructor) and the blue oat mite (Penthaleus .. major) (Robinson & Hoffman, 2000) as well as the flea beetle (Phyllotreta spp.)…”

Section: Effect Of Chemical Seed Treatment On the Germination And Sementioning

confidence: 99%

Effect of chemical seed treatment on the germination and seedling vigour of canola (Brassica napus var. oleifera)

Villiers

Agenbag

Lamprecht

2005

South African Journal of Plant and Soil

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Incubation studies were conducted to determine effects of two chemical seed treatments (Cruiser & SA-combination) on the germination and seedling vigour of canola (cv. Varola 44) seed. Germination percentages of the Cruiser and SA-combination treated seeds were not significantly reduced compared to untreated seeds (control) under favourable temperature and water conditions. After exposure to high temperature (41°C) and humidity to accelerate ageing of the seed, germination and seedling vigour were reduced by both seed treatments. In contrast to differences in germination which decreased with time of incubation, the effect of both chemical treatments ts on seedling vigour increased as the incubation period increased. As expected, phytotoxic effects increased with increasing application rates, but significant differences in germination percentage and seedling growth between similar rates of the two chemical treatments indicated that the SA combination treatment was more phytotoxic than Cruiser.

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“…Physiological traits and patterns of mycoparasitism (Pemberton et al, 1990;Dick, 2000c) could provide independent supra-specific correlates. A meticulous taxonomic reassessment of historic generic names, and their type species, which have been placed in synonymy with Phytophthora sensu lato will be required (see Table 3).…”

Section: Molecular Systematics Evolutionary Origins and Taxonomy Inmentioning

confidence: 99%

Towards and Understanding of the Evolution of the Downy Mildews

Dick¹

Advances in Downy Mildew Research

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PeronosporalesObligate parasites of dicotyledons (very rarely monocotyledons). Thallus mycelial and intercellular with haustoria; zoosporogenesis, when present, by internal cleavage, otherwise asexual reproduction by deciduous conidiosporangia; conidiosporangiophores well-differentiated, persistent; oogonia thin-walled, oospore single, aplerotic with a well-defined exospore wall layer derived from persistent periplasm. Possibility that all are dependent on exogenous sources of sterols. Peronosporaceae: Myceliar fungi with large, lobate haustoria. Asexual reproduction by deciduous PythialesParasites or saprotrophs; parasites mostly in axenic culture. Some members parasitic on fungi and some on animals. Thallus mycelial with little evidence of cytoplasmic streaming; zoosporangium formation terminal, less frequently sequential, then percurrent or by internal or sympodial proliferation; sporangiophores rarely differentiated; oogonial periplasm minimal and not persistent; oospore usually single, plerotic or aplerotic. Evidence of partial dependence on exogenous sterol precursors. Pythiaceae: Thallus mycelial or monocentric and pseudomycelial; hyphae diameter;conidiosporangia or conidia borne on conidiosporangiophores; conidiosporangia pedicellate; conidiosporangiophores dichotomously branched, monopodially branched, or unbranched and clavate; conidiogenesis simultaneous; zoosporogenesis, when present, internal within a plasmamembranic membrane, zoospore release by operculate or poroid discharge. deciduous sporangia, conidiosporangia or conidia borne on unbranched conidiophores. Conidiogenesis sequential and percurrent. Zoosporogenesis internal with papillate discharge. Albuginaceae:Myceliar fungi with small, spherical or peg-like haustoria. Asexual reproduction by Genus: Albugo.zoosporogenesis either by internal cleavage without vesicular discharge or with a plasmamembranic vesicle or by external cleavage in a homohylic vesicle; oogonia (with very few exceptions) thin-walled; oospores never strictly plerotic. Aerobic metabolism. Freshwater or marine.

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Infection of Pythium and Phytophthora species by Olpidiopsis gracilis (Oomycetes)

Cited by 12 publications

References 4 publications

O gênero Olpidiopsis (Oomycota) no Nordeste do Brasil

O gênero Olpidiopsis (Oomycota) no Nordeste do Brasil

Effect of chemical seed treatment on the germination and seedling vigour of canola (Brassica napus var. oleifera)

Towards and Understanding of the Evolution of the Downy Mildews

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