Navegando por Autor "Silva, Meiriele da"
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Item Calidion bombacis, a new combination for Uredo bombacis with the record of Bombacopsis glabra (Bombacaceae) as a new host from Brazil(Brazilian Journal of Microbiology, 2009-03-01) Silva, Meiriele da; Soares, Dartanhã José; Barreto, Robert WeingartThe new combination Calidion bombacis is proposed for the rust species formerly known as Uredo bombacis. This nomenclatural change is based on the examination of newly collected material of this fungus from a new host, Bombacopsis glabra from Brazil, and reexamination of the isotype. Until now this fungus was only known to occur in Asia (China, India and Sri Lanka). Therefore, this is also the first record of this fungus from the NeotropicsItem Cercosporoid hyphomycetes associated with Tibouchina herbacea (Melastomataceae) in Brazil(Mycological Progress, 2014-08) Parreira, Douglas Ferreira; Silva, Meiriele da; Pereira, Olinto Liparini; Soares, Dartanha José; Barreto, Robert WeingartA survey of fungal pathogens associated with cane tibouchina, Tibouchina herbacea (Melastomataceae), was conducted in the neotropics, concentrated in south and southeastern Brazil and aimed at finding potential biological control agents for this herbaceous invasive weed for introduction into Hawaii. Numerous fungal species were found, including five cercosporoid fungi. Four new taxa are described and illustrated here: Passalora tibouchinae, Pseudocercospora subsynnematosa, Pseudocercospora tibouchina-herbaceae and Pseudocercospora tibouchinicola. A phylogenetic analysis of the ITS and TEF-1α regions of the three new species of Pseudocercospora was conducted and confirmed their separation as distinct taxa as indicated by morphological and cultural features. Additionally, Cercospora apii is reported for the first time on T. herbacea. Among the species of fungi described in this study, two appear particularly promising for use in a biological control program because they were found to cause severe disease on T. herbacea: Passalora tibouchinae and Pseudocercospora subsynnematosa. Additional tests, including host-specificity screening, will be required in order to confirm this potential.Item Exploring fungal diversity: Passalora, Pseudocercospora, Sirosporium and Zasmidium on Brazilian plants(Universidade Federal de Viçosa, 2016-02-18) Silva, Meiriele da; Barreto, Robert Weingart; http://lattes.cnpq.br/4359463327390130Fungi cercosporoid are one of the largest groups of microfungi, with over than 2000 associated names, including several genera of Mycosphaerella and Mycosphaerella-like sexual morph. The cercosporoids are cosmopolitan fungi and are highly diverse especially in tropical and subtropical countries. Cercoporoid fungi vary from being saprobic, hyperparasitic and plant pathogenic, in the last case they are known to causes several important diseases in several crops. In the last years, the taxonomy of cercosporoid fungi has undergone significant changes. The application of molecular techniques have generated new informations that are helping the understanding of the phylogenetic relationships leading to a re-structuration of the classification system of this group of fungi with rearrangements, fusion of genera and recognition of new genera as distinct. In this study, a total of 27 Pseudocercospora spp., 7 Passalora spp., 4 Zasmidium spp. and one Sirosporium were collected, cultivated and subjected to a multigene analysis. Four genomic regions (LSU, ITS, tef1 and actA) were used to performed a Bayesian analysis with combined ITS, actA and tef1 sequence alignment. Our results based on DNA phylogeny integrated with morphology, revealed a rich diversity with eighteen new species to be described, namely: Pseudocercospora aeschynomenicola, Ps. diplusodonii, Ps. emmotunicola, Ps. manihotii, Ps. perae, Ps. planaltinensis, Ps. pothomorphes, Ps. sennae-multijugae, Ps. solani-pseudocapsicicola, Ps. vassobiae, Ps. wulffiae, Ps. xylopiae, Passalora dasyphyllii, Sirosporium tocoyenae, Zasmidium aspidospermae, Z. brosimii, Z. peixotoana and Z. roupalina. Eleven epitype specimens were designated, Pseudocercospora bixae, P. chamaecristae, P.exilis, P. luzardii, P. plumeriifolii, P. richardsoniicola, P. rigidae, P. struthanthi, Passalora schefflerae, Pa. rubida and Pa. vicosae, three species newly reported, Ps. euphorbiacearum, Ps. tecomicola, Ps. trinidadensis and several new host records linked to known cercosporoid in Brazil. Additionally, the phylogenetic position of Camptomeris leucaenae was investigated for the first time based in sequences of the large subunit ribosomal (LSU). This study confirmed that C. leucaenae belongs to Mycosphaerellaceae s. str. (Capnodiales, Dothideomycetes) and is closely related to Cymadothea trifolii a pathogen a native leguminous plant from Europe. The present study represents the first organized effort towards generating molecular data to support the taxonomy of cercosporoid from Brazil. It yielded information for 40 taxa, representing only a small fraction of yet unknown species diversity in the country. Many additional species still need to be collected and recollected to enable a better understanding of systematic of cercosporoid fungi in Brazil.Item Micobiota folícola de Dimorphandra wilsonii, espécie arbórea brasileira ameaçada de extinção(Universidade Federal de Viçosa, 2012-02-10) Silva, Meiriele da; Pereira, Olinto Liparini; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4767879D4; Barreto, Robert Weingart; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783300H6; http://lattes.cnpq.br/4359463327390130; Costa, Maurício Dutra; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4728228J5; Evans, Harold Charles; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4501250T6; Bezerra, José Luiz; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4788506P2; Furtado, Gleiber Quintão; http://lattes.cnpq.br/1676492508949464Dimorphandra wilsonii Rizzini, Fabaceae, popularmente conhecida como faveiro de Wilson , é espécie endêmica de Minas Gerais, que ocorre na transição do Cerrado para a Mata-Atlântica, ao norte de Belo Horizonte. Consta do anexo I da lista da Flora Brasileira Ameaçada de Extinção, nas listas da flora ameaçada de Minas Gerais e da International Union for Conservation of Nature (IUCN), onde figura como criticamente ameaçada, o nível que antecede o de extinção. Em contrapartida, Dimorphandra mollis Benth., planta taxonomicamente muito próxima do faveiro de Wilson, popularmente conhecida como faveira e falso barbatimão , é comum e amplamente distribuída pelo Cerrado brasileiro principalmente nos estados de Goiás, Mato Grosso, Minas Gerais e São Paulo. Com o objetivo de contribuir para o conhecimento sobre a micobiota associada a plantas ameaçadas de extinção no Brasil e, por conseguinte, também possivelmente ameaçadas, efetuou-se levantamento da micobiota folícola associada a D. wilsonii, e, paralelamente, de fungos folícolas que colonizam D. mollis, encontrados nas proximidades de indivíduos remanescentes de D. wilsonii. Nesse tipo de estudo micológico visa-se à geração de informação tanto na área micológica quanto na contribuição na geração de uma lista preliminar de espécies fúngicas em risco de extinção. Pretendeu-se excluir da lista de espécies fúngicas em risco de extinção aquelas que, além de ocorrerem sobre D. wilsonii, também ocorrem sobre D. mollis. As coletas foram concentradas nos municípios de Caetanópolis, Paraopeba, Juatuba, Fortuna de Minas, Sete lagoas e Pequi. Quinze espécies fúngicas foram encontradas, descritas e ilustradas, dentre as quais oito tiveram a região ITS (Internal Transcribed Spacer) do rDNA e a região LSU (Large Subunit 28S) parcialmente sequenciadas e comparadas filogeneticamente a outras sequências disponíveis no GenBank a fim de se obter uma compressão mais completa das relações destes gêneros. Treze espécies fúngicas foram encontradas associadas a D. wilsonii: Vesiculohyphomyces cerradensis, Johansonia chapadiensis, Trichomatomyces byrsonimae, Piricauda paraguayensis, Geastrumia polystigmatis, Phillipsiella atra, Stomiopeltis suttoniae, Microcalliopsis dipterygis, Janetia sp. 1 (provável espécie nova), Byssogene sp. (provável espécie nova), Pseudocercospora sp. (provável espécie nova), Pseudocercosporella sp. (provável espécie nova), cf. Radulidium sp. (provável gênero novo). Seis espécies foram encontradas associadas a D. mollis: Trichomatomyces byrsonimae, Piricauda paraguayensis, Pseudocercospora sp. (provável espécie nova), Pseudocercosporella sp. (provável espécie nova), Janetia sp. 2 (provável espécie nova) e Alveariospora distoseptata (proposto como novo gênero e espécie). As espécies Vesiculohyphomyces cerradensis, Trichomatomyces byrsonimae, Piricauda paraguayensis, Geastrumia polystigmatis, Phillipsiella atra, Microcalliopsis dipterygis e Stomiopeltis suttoniae já foram relatadas ocorrendo em outras espécies de plantas tendo ampla distribuição, portanto, não tem interesse conservacionista. Quatro fungos ocorreram em ambas as espécies de Dimorphandra: Pseudocercospora sp. (provável espécie nova), Pseudocercosporella sp. (provável espécie nova), Piricauda paraguayensis e Trichomatomyces byrsonimae. Conclui-se que há possibilidade de que os três novos taxa associados unicamente a D. wilsonii: Janetia sp., Byssogene sp. e cf. Radulidium sp., mereçam o status de espécies possivelmente ameaçadas de extinção.Item Naming potentially endangered parasites: Foliicolous mycobiota of Dimorphandra wilsonii, a highly threatened Brazilian tree species(Plos One, 2016-02-24) Silva, Meiriele da; Pinho, Danilo B.; Pereira, Olinto L.; Fernandes, Fernando M.; Barreto, Robert W.A survey of foliicolous fungi associated with Dimorphandra wilsonii and Dimorphandra mollis (Fabaceae) was conducted in the state of Minas Gerais, Brazil. Dimorphandra wilsonii is a tree species native to the Brazilian Cerrado that is listed as critically endangered. Fungi strictly depending on this plant species may be on the verge of co-extinction. Here, results of the pioneering description of this mycobiota are provided to contribute to the neglected field of microfungi conservation. The mycobiota of D. mollis, which is a common species with a broad geographical distribution that co-occurs with D. wilsonii, was examined simultaneously to exclude fungal species occurring on both species from further consideration for conservation because microfungi associated with D. wilsonii should not be regarded as under threat of co-extinction. Fourteen ascomycete fungal species were collected, identified, described and illustrated namely: Byssogene wilsoniae sp. nov., Geastrumia polystigmatis, Janetia dimorphandra-mollis sp. nov., Janetia wilsoniae sp. nov., Johansonia chapadiensis, Microcalliopsis dipterygis, Phillipsiella atra, Piricauda paraguayensis, Pseudocercospora dimorphandrae sp. nov., Pseudocercosporella dimorphandrae sp. nov., Ramichloridiopsis wilsoniae sp. and gen. nov., Stomiopeltis suttoniae, Trichomatomyces byrsonimae and Vesiculohyphomyces cerradensis. Three fungi were exclusively found on D. wilsonii and were regarded as potentially threatened of extinction: B. wilsoniae, J. wilsoniae and R. wilsoniae.Item Phoma destructiva causing blight of tomato plants: a new fungal threat for tomato plantations in Brazil?(Tropical Plant Pathology, 2017-11-20) Colmán, Adans A.; Alves, Janaina L.; Silva, Meiriele da; Barreto, Robert W.Solanum lycopersicum is among the most important crops in Brazil. This crop is affected by a large range of fungal diseases that are recognized as major limitations for tomato production. Recently, plants grown in a greenhouse in Viçosa, Minas Gerais, Brazil, were found to bear severe blight symptoms. A pycnidial coelomycete was repeatedly found in association with necrotic tissues. The fungus had its morphology recognized as equivalent to that of Phoma and related genera. A phylogenetic analysis based on nrDNA (ITS) and partial β-tubulin (TUB) sequences led to the conclusion that the fungus involved was Phoma destructiva. Pathogenicity tests showed that, after 5 days, blight symptoms developed on leaves, flowers and stems of plants belonging to thirteen different tomato varieties tested. This fungal species is mostly known for causing post-harvest tomato rot, which is only regarded as a secondary disease in Brazil. This is in disagreement with the observations made in this work. Here, the disease symptoms caused by the fungus were very severe, fully justifying the scientific name of the pathogen. Under favorable environmental conditions, aggressive strains of P. destructiva, such as the one isolated in this study, may become significant threats to tomato plantations in Brazil.