Consulta: subjectFacets:"Mycosphaerella"
Registros recuperados: 10
Data/hora: 10/06/2024 08:15:17

Species of Mycosphaerella and related anamorphs on Eucalyptus leaves from Thailand
Provedor de dados: 16
Autores: Crous, R. Cheewangkoon: P.W.; Hyde, K.D.; Groenewald, J.Z.; To-anan, C.
Species of Mycosphaerella and their related anamorphs represent potentially serious foliar pathogens of Eucalyptus. The fungi treated in the present study were isolated from symptomatic Eucalyptus leaves collected in Thailand during June –October 2007. Species were initially identified based on morphological and cultural characteristics. Identifications were confirmed using comparisons of DNA sequence data of the internal transcribed spacers (ITS1, 5.8S nrDNA, ITS2) and the 28S nrDNA (LSU) regions. To help distinguish species of Pseudocercospora, the dataset was expanded by generating partial sequences of the translation elongation factor 1-α and actin genes. By integrating the morphological and molecular datasets, five new taxa were distinguished, namely...
Tipo: Article / Letter to the editor
Palavras-chave: Eucalyptus; Mycosphaerella; Mycosphaerella leaf disease; Penidiella; Pseudocercospora; Taxonomy.
Ano: 2008
URL: http://www.repository.naturalis.nl/record/532327

Novel species of Mycosphaerellaceae and Teratosphaeriaceae
Provedor de dados: 16
Autores: Crous, P.W.; Summerell, B.A.; Carnegie, A.J.; Wingfield, M.J.; Groenewald, J.Z.
Recent phylogenetic studies based on multi-gene data have provided compelling evidence that the Mycosphaerellaceae and Teratosphaeriaceae represent numerous genera, many of which can be distinguished based on their anamorph morphology. The present study represents the second contribution in a series describing several novel species in different capnodealean genera defined in a previous study. Novelties on Eucalyptus from Australia include: Penidiella pseudotasmaniensis, P. tenuiramis, Phaeothecoidea intermedia, P. minutispora, Pseudocercospora tereticornis, Readeriella angustia, R. eucalyptigena, R. menaiensis, R. pseudocallista, R. tasmanica, Teratosphaeria alboconidia, T. complicata, T. majorizuluensis, T. miniata, T. profusa, Zasmidium aerohyalinosporum...
Tipo: Article / Letter to the editor
Palavras-chave: Mycosphaerella; Penidiella; Phaeophleospora; Phaeothecoidea; Pseudocercospora; Readeriella; Teratosphaeria; Zasmidium.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/532086

Multiple gene genealogies and phenotypic characters differentiate several novel species of Mycosphaerella and related anamorphs on banana
Provedor de dados: 16
Autores: Arzanlou, M.; Groenewald, J.Z.; Fullerton, R.A.; Abeln, E.C.A.; Carlier, J.; Zapater, M.-F.; Buddenhagen, I.W.; Viljoen, A.; Crous, P.W.
Three species of Mycosphaerella, namely M. eumusae, M. fijiensis, and M. musicola are involved in the Sigatoka disease complex of bananas. Besides these three primary pathogens, several additional species of Mycosphaerella or their anamorphs have been described from Musa. However, very little is known about these taxa, and for the majority of these species no culture or DNA is available for study. In the present study, we collected a global set of Mycosphaerella strains from banana, and compared them by means of morphology and a multi-gene nucleotide sequence data set. The phylogeny inferred from the ITS region and the combined data set containing partial gene sequences of the actin gene, the small subunit mitochondrial ribosomal DNA and the histone H3...
Tipo: Article / Letter to the editor
Palavras-chave: Mycosphaerella; Phylogeny; Sigatoka disease complex; Taxonomy.
Ano: 2008
URL: http://www.repository.naturalis.nl/record/531861

Novel fungi from an ancient niche: cercosporoid and related sexual morphs on ferns
Provedor de dados: 16
Autores: Guatimosim, E.; Schwartsburd, P.B.; Barreto, R.W.; Crous, P.W.
The fern flora of the world (Pteridophyta) has direct evolutionary links with the earliest vascular plants that appeared in the late Devonian. Knowing the mycobiota associated to this group of plants is critical for a full understanding of the Fungi. Nevertheless, perhaps because of the minor economic significance of ferns, this niche remains relatively neglected by mycologists. Cercosporoid fungi represent a large assemblage of fungi belonging to the Mycosphaerellaceae and Teratosphaeriaceae (Ascomycota) having cercospora-like asexual morphs. They are well-known pathogens of many important crops, occurring on a wide host range. Here, the results of a taxonomic study of cercosporoid fungi collected on ferns in Brazil are presented. Specimens were obtained...
Tipo: Article / Letter to the editor
Palavras-chave: Biodiversity; Cercospora; Frond spot; Multilocus sequence typing (MLST) Mycosphaerella phylogeny Pteridophyta systematics; Mycosphaerella; Phylogeny; Pteridophyta; Systematics.
Ano: 2016
URL: http://www.repository.naturalis.nl/record/611855

Application of the consolidated species concept to Cercospora spp. from Iran
Provedor de dados: 16
Autores: Bakhshi, M.; Arzanlou, M.; Babai-ahari, A.; Groenewald, J.Z.; Braun, U.; Crous, P.W.
The genus Cercospora includes many important plant pathogenic fungi associated with leaf spot diseases on a wide range of hosts. The mainland of Iran covers various climatic regions with a great biodiversity of vascular plants, and a correspondingly high diversity of cercosporoid fungi. However, most of the cercosporoid species found to date have been identified on the basis of morphological characteristics and there are no cultures that support these identifications. In this study the Consolidated Species Concept was applied to differentiate Cercospora species collected from Iran. A total of 161 Cercospora isolates recovered from 74 host species in northern Iran were studied by molecular phylogenetic analysis. Our results revealed a rich diversity of...
Tipo: Article / Letter to the editor
Palavras-chave: Biodiversity; Cercospora apii complex; Cercosporoid; Host speciﬁcity; Leaf spot; Multilocus sequence typing (MLST); Mycosphaerella; Taxonomy.
Ano: 2015
URL: http://www.repository.naturalis.nl/record/560054

Unravelling Mycosphaerella: do you believe in genera?
Provedor de dados: 16
Autores: Crous, P.W.; Summerell, B.A.; Carnegie, A.J.; Wingfield, M.J.; Hunter, G.C.; Burgess, T.I.; Andjic, V.; P.A. Barber; J.Z. Groenewald.
Many fungal genera have been defined based on single characters considered to be informative at the generic level. In addition, many unrelated taxa have been aggregated in genera because they shared apparently similar morphological characters arising from adaptation to similar niches and convergent evolution. This problem is aptly illustrated in Mycosphaerella. In its broadest definition, this genus of mainly leaf infecting fungi incorporates more than 30 form genera that share similar phenotypic characters mostly associated with structures produced on plant tissue or in culture. DNA sequence data derived from the LSU gene in the present study distinguish several clades and families in what has hitherto been considered to represent the Mycosphaerellaceae....
Tipo: Article / Letter to the editor
Palavras-chave: Cibiessia; Colletogloeum; Dissoconium; Kirramyces; Mycosphaerella; Passalora; Penidiella; Phaeophleospora; Phaeothecoidea; Pseudocercospora; Ramularia; Readeriella; Stenella; Teratosphaeria; Zasmidium.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/531971

Host specificity and speciation of Mycosphaerella and Teratosphaeria species associated with leaf spots of Proteaceae
Provedor de dados: 16
Autores: Crous, P.W.; Summerell, B.A.; Mostert, L.; Groenewald, J.Z.
Cheirosporium gen. nov. is characterised by the production of sporodochial conidiomata, semi-macronematous to macronematous onidiophores that possess several distinct sterile branches, and cheiroid, smooth-walled conidia with rhexolytic secession. The 28S rDNA and ITS rDNA operon of this taxon were amplified and sequenced. A BLAST search revealed low homology between Cheirosporium triseriale and existing sequences in public databases, supporting the hypothesis that the species is new to science. Phylogenetic analysis showed that C. triseriale groups with Dictyosporium and allied species, and nests within the Pleosporales (Dothideomycetes, Ascomycota).heirosporium is morphologically distinct from the cheirosporous genera Cheiromyces, Cheiromycina,...
Tipo: Article / Letter to the editor
Palavras-chave: ITS; Leucadendron; Leucospermum; Mycosphaerella; Protea; Teratosphaeria.
Ano: 2008
URL: http://www.repository.naturalis.nl/record/532268

Niche sharing reflects a poorly understood biodiversity phenomenon
Provedor de dados: 16
Autores: Crous, P.W.; Wingfield, M.J.; Groenewald, J.Z.
Eucalyptus spp. are susceptible to a large number of foliar pathogens, some of which can cause serious defoliation and die-back. In this study, a single leaf spot on a Eucalyptus leaf collected in Madagascar revealed an unusual association of microfungi with disease symptoms. Initial observations indicated that the leaf spot was associated with Mycosphaerella marksii, a common pathogen of eucalypts. However, more intensive scrutiny showed the presence of several other microfungi co-occurring in this, and other leaf spots on the leaf. A total of 41 single conidial propagules were subsequently obtained from a single lesion for morphological study and DNA sequence comparisons. Based on these data, 11 members of the Capnodiales, including one species of...
Tipo: Article / Letter to the editor
Palavras-chave: Eucalyptus; ITS; Mycosphaerella; Systematics; Teratosphaeria.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/531761

Zymoseptoria gen. nov.: a new genus to accommodate Septoria-like species occurring on graminicolous hosts
Provedor de dados: 16
Autores: Quaedvlieg, W.; Kema, G.H.J.; Groenewald, J.Z.; Verkley, G.J.M.; Seifbarghi, S.; Razavi, M.; Mirzadi Gohari, A.; Mehrabi, R.; Crous, P.W.
The Mycosphaerella complex is both poly- and paraphyletic, containing several different families and genera. The genus Mycosphaerella is restricted to species with Ramularia anamorphs, while Septoria is restricted to taxa that cluster with the type species of Septoria, S. cytisi, being closely related to Cercospora in the Mycosphaerellaceae. Species that occur on graminicolous hosts represent an as yet undescribed genus, for which the name Zymoseptoria is proposed. Based on the 28S nrDNA phylogeny derived in this study, Zymoseptoria is shown to cluster apart from Septoria. Morphologically species of Zymoseptoria can also be distinguished by their yeast-like growth in culture, and the formation of different conidial types that are absent in Septoria s.str....
Tipo: Article / Letter to the editor
Palavras-chave: Hordeum vulgare; ITS; LSU; Multilocus sequence typing; Mycosphaerella; Septoria; Systematics; Triticum aestivum.
Ano: 2011
URL: http://www.repository.naturalis.nl/record/532144

Co-occurring species of Teratosphaeria on Eucalyptus
Provedor de dados: 16
Autores: Crous, P.W.; Groenewald, J.Z.; Summerell, B.A.; Wingfield, B.D.; Wingfield, M.J.
A common leaf spot disease occurring on Eucalyptus cladocalyx and E. lehmannii in the Western Cape Province of South Africa is known from literature to be caused by the fungus Coniothyrium ovatum, which is a pathogen native to several eucalypts in Australia. Recent collections have shown that Australian material identified as C. ovatum is morphologically and phylogenetically distinct from the South African specimens, and that all these taxa would be better accommodated in the genus Teratosphaeria. South African specimens previously identified as C. ovatum were found to represent two species that co-occur in the same leaves and even spots and are described here as T. juvenalis and T. verrucosa. Furthermore, a fresh collection of T. ovata from E. phoenicea...
Tipo: Article / Letter to the editor
Palavras-chave: Colletogloeopsis; Coniothyrium; Eucalyptus; Kirramyces; Mycosphaerella; Mycosphaerella leaf disease; Readeriella; Taxonomy.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/532187