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Registros recuperados: 6
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A fissitunicate ascus mechanism in the Calosphaeriaceae, and novel species of Jattaea and Calosphaeria on Prunus wood Naturalis
Damm, U.; Crous, P.W.; Fourie, P.H..
During a survey of Prunus wood from South Africa, isolations were made of three presumably Calosphaerialean fungi that formed hyphomycetous, phialidic anamorphs in culture. In order to reveal the phylogenetic relationship of these fungi, they were characterised on a morphological and molecular (LSU and ITS rDNA) basis. Two isolates that formed a teleomorph in culture are newly described as Calosphaeria africana sp. nov. Although asci of Calosphaeria are characterised by having non-amyloid apical rings, two functional wall layers were observed in asci of C. africana, which has hitherto not been observed in any member of the Calosphaeriaceae. However, Calosphaeriaceae (Calosphaeriales, Sordariomycetes) are not closely related to other bitunicate fungi like...
Tipo: Article / Letter to the editor Palavras-chave: Apical ring; Ascospore discharge; Ascus dehiscence; Beta-tubulin; Calosphaeria; Calosphaeriaceae; ITS; Jattaea; LSU; Phialophora; Prunus; SSU; Systematics.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/531626
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Coniochaeta (Lecythophora), Collophora gen. nov. And Phaeomoniella species associated with wood necroses of Prunus trees Naturalis
Damm, U.; Fourie, P.H.; Crous, P.W..
Species of the genus Coniochaeta (anamorph: Lecythophora) are known as pathogens of woody hosts, but can also cause opportunistic human infections. Several fungi with conidial stages resembling Lecythophora were isolated from necrotic wood samples of Prunus trees in South Africa. In order to reveal their phylogenetic relationships, these fungi were studied on a morphological and molecular (5.8S nrDNA, ITS-1, ITS-2, GAPDH, EF-1α, 28S nrDNA, 18S nrDNA) basis. Some of the isolates were identified as Coniochaeta (Sordariomycetes), including C. velutina and two new species, C. africana and C. prunicola. The majority of the isolates, however, formed pycnidial or pseudopycnidial synanamorphs and were not closely related to Coniochaeta. According to their 28S...
Tipo: Article / Letter to the editor Palavras-chave: Collophora; Coniochaeta; EF-1α; GAPDH; ITS; Lecythophora; LSU; Pathogenicity; Phaeomoniella; Prunus; SSU; Systematics.
Ano: 2010 URL: http://www.repository.naturalis.nl/record/531834
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Cymadothea trifolii, an obligate biotrophic leaf parasite of Trifolium, belongs to Mycosphaerellaceae as shown by nuclear ribosomal DNA analyses Naturalis
Simon, U.K.; Groenewald, J.Z.; Crous, P.W..
The ascomycete Cymadothea trifolii, a member of the Dothideomycetes, is unique among obligate biotrophic fungi in its capability to only partially degrade the host cell wall and in forming an astonishingly intricate interaction apparatus (IA) in its own hyphae, while the attacked host plant cell is triggered to produce a membranous bubble opposite the IA. However, no sequence data are currently available for this species. Based on molecular phylogenetic results obtained from complete SSU and partial LSU data, we show that the genus Cymadothea belongs to the Mycosphaerellaceae (Capnodiales, Dothideomycetes). This is the first report of sequences obtained for an obligate biotrophic member of Mycosphaerellaceae.
Tipo: Article / Letter to the editor Palavras-chave: Biotrophy; Capnodiales; Cymadothea trifolii; Dothideomycetes; GenomiPhi; LSU; Mycosphaerella kilianii; Mycosphaerellaceaesooty/black; Blotch of clover; SSU.
Ano: 2009 URL: http://www.repository.naturalis.nl/record/532112
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Morphological and genetic diversity of Beaufort Sea diatoms with high contributions from the Chaetoceros neogracilis species complex ArchiMer
Balzano, Sergio; Percopo, Isabella; Siano, Raffaele; Gourvil, Priscillia; Chanoine, Melanie; Marie, Dominique; Vaulot, Daniel; Sarno, Diana.
Seventy-five diatoms strains isolated from the Beaufort Sea (Canadian Arctic) in the summer of 2009 were characterized by light and electron microscopy (SEM and TEM) as well as 18S and 28S rRNA gene sequencing. These strains group into 20 genotypes and 17 morphotypes and are affiliated with the genera Arcocellulus, Attheya, Chaetoceros, Cylindrotheca, Eucampia, Nitzschia, Porosira, Pseudo-nitzschia, Shionodiscus, Thalassiosira, Synedropsis. Most of the species have a distribution confined to the northern/polar area. Chaetoceros neogracilis and Chaetoceros gelidus were the most represented taxa. Strains of C. neogracilis were morphologically similar and shared identical 18S rRNA gene sequences, but belonged to four distinct genetic clades based on 28S rRNA,...
Tipo: Text Palavras-chave: Biogeography; ITS; ITS2 secondary structure; LSU; Morphology; Phylogeny; Polar diatoms; SSU.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00356/46718/46584.pdf
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Phytopythium: molecular phylogeny and systematics Naturalis
Cock, A.W.A.M. de; Lodhi, A.M.; Rintoul, T.L.; Bala, K.; Robideau, G.P.; Gloria Abad, Z.; Coffey, M.D.; Shahzad, S.; Lévesque, C.A..
The genus Phytopythium (Peronosporales) has been described, but a complete circumscription has not yet been presented. In the present paper we provide molecular-based evidence that members of Pythium clade K as described by Lévesque & de Cock (2004) belong to Phytopythium. Maximum likelihood and Bayesian phylogenetic analysis of the nuclear ribosomal DNA (LSU and SSU) and mitochondrial DNA cytochrome oxidase subunit 1 (COI) as well as statistical analyses of pairwise distances strongly support the status of Phytopythium as a separate phylogenetic entity. Phytopythium is morphologically intermediate between the genera Phytophthora and Pythium. It is unique in having papillate, internally proliferating sporangia and cylindrical or lobate antheridia. The...
Tipo: Article / Letter to the editor Palavras-chave: COI; LSU; Oomycetes; Oomycota; Peronosporales; Phytopythium; Pythiales; SSU.
Ano: 2015 URL: http://www.repository.naturalis.nl/record/560055
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Resolving the phylogenetic and taxonomic status of dark-spored teleomorph genera in the Botryosphaeriaceae Naturalis
Phillips, A.J.L.; Alves, A.; Pennycook, S.R.; Johnston, P.R.; Ramaley, A.; Akulov, A.; Crous:, P.W..
Species in the Botryosphaeriaceae are common plant pathogens and saprobes found on a variety of mainly woody hosts. Teleomorphs typically have hyaline, aseptate ascospores. However, some have been reported with brown ascospores and their taxonomic status is uncertain. A multi-gene approach (SSU, ITS, LSU, EF1-α and β-tubulin) was used to resolve the correct phylogenetic position of the dark-spored ‘Botryosphaeria’ teleomorphs and related asexual species. Neodeightonia and Phaeobotryon are reinstated for species with brown ascospores that are either 1-septate (Neodeightonia) or 2-septate (Phaeobotryon). Phaeobotryosphaeria is reinstated for species with brown, aseptate ascospores that bear an apiculus at either end. The status of Sphaeropsis is clarified...
Tipo: Article / Letter to the editor Palavras-chave: Barriopsis; Diplodia; Dothiorella; EF1-α; ITS; Lasiodiplodia; LSU; Neodeightonia; Phaeobotryon; Phaeobotryosphaeria; Phylogeny; Spencermartinsia; Sphaeropsis; SSU.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/532050
Registros recuperados: 6
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