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| Registros recuperados: 39 | |
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| Carlucci, A.; Raimondo, M.L.; Santos, J.; Phillips, A.J.L.. |
| Plectosphaerella cucumerina, most frequently encountered in its Plectosporium state, is well known as a pathogen of several plant species causing fruit, root and collar rot, and collapse. It is considered to pose a serious threat to melon (Cucumis melo) production in Italy. In the present study, an intensive sampling of diseased cucurbits as well as tomato and bell pepper was done and the fungal pathogens present on them were isolated. Phylogenetic relationships of the isolates were determined through a study of ribosomal RNA gene sequences (ITS cluster and D1/D2 domain of the 28S rRNA gene). Combining morphological, culture and molecular data, six species were distinguished. One of these (Pa. cucumerina) is already known. Four new species are described as... |
| Tipo: Article / Letter to the editor |
Palavras-chave: D1/D2; ITS; LSU; Phylogeny; Plectosporium; RDNA; Systematics; Taxonomy. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/531914 |
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| Kundrata, R.; Bocakova, M.; Bocak, L.. |
| The Artematopodidae is a species-poor beetle family with contentious relationships to byrrhoid and elateroid families. Recent molecular phylogenetic analyses brought ambiguous results based on a single sequenced species. We investigated the taxonomic placement of Artematopodidae within Elateriformia using ribosomal (18S, 28S) and mitochondrial (rrnL, cox1) molecular markers and three artematopodid species. Our analyses placed Artematopodidae close to Omethidae+Telegeusidae in a basal position of broadly defined Elateroidea. Additionally, we described the first artematopodid species from China – Eurypogon jaechi sp. nov. and E. heishuiensis sp. nov. These species are reported from mountains of Yunnan and can be easily distinguished from their Palaearctic... |
| Tipo: Article / Letter to the editor |
Palavras-chave: MtDNA; RDNA; Diversity; Elateriformia; New species; Palaearctic Region; Phylogeny; Taxonomy; 42.75; 42.64. |
| Ano: 2013 |
URL: http://www.repository.naturalis.nl/record/462591 |
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| Zhao, R.-L.; Desjardin, D.E.; Soytong, K.; Hyde, K.D.. |
| Recent collections of bird’s nest fungi (i.e. Crucibulum, Cyathus, Mycocalia, Nidula, and Nidularia species) in northern Thailand resulted in the discovery of a new species of Cyathus, herein described as C. subglobisporus. This species is distinct by a combination of ivory-coloured fruiting bodies covered with shaggy hairs, plications on the inner surface of the peridium and subglobose basidiospores. Phylogenetic analyses based on ITS and LSU ribosomal DNA sequences using neighbour-joining, maximum likelihood and weighted maximum parsimony support Cyathus subglobisporus as a distinct species and sister to a clade containing C. annulatus, C. renweii and C. stercoreus in the Striatum group. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Bird’s nest fungi; Gasteromycetes; New species; Phylogeny; RDNA. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/532073 |
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| Benzoni, F.; Arrigoni, R.; Stefani, F.; Reijnen, B.T.; Montano, S.; Hoeksema, B.. |
| The scleractinian species Psammocora explanulata and Coscinaraea wellsi were originally classified in the family Siderastreidae, but in a recent morpho-molecular study it appeared that they are more closely related to each other and to the Fungiidae than to any siderastreid taxon. A subsequent morpho-molecular study of the Fungiidae provided new insights regarding the phylogenetic relationships within that family. In the present study existing molecular data sets of both families were analyzed jointly with those of new specimens and sequences of P. explanulata and C. wellsi. The results indicate that both species actually belong to the Cycloseris clade within the family Fungiidae. A reappraisal of their morphologic characters based on museum specimens and... |
| Tipo: Article / Letter to the editor |
Palavras-chave: COI; Coscinaraea wellsi; Psammocora explanulata; RDNA; 42.72. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/421558 |
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| Zhang, Y.; Fournier, J.; Crous, P.W.; Pointing, S.B.; Hyde, K.D.. |
| Two new species of Amniculicola, A. immersa sp. nov. and A. parva sp. nov. from submerged wood in a freshwater environment in Denmark and France are respectively described and illustrated. In addition, partial 28S rDNA sequence data is analysed to investigate their phylogenetic relationships with other pleosporalean taxa. All presently known Amniculicola species, A. immersa, A. lignicola and A. parva, form a robust clade together with the anamorphic species Anguillospora longissima, Spirosphaera cupreorufescens and Repetophragma ontariense. These six species, which are all from freshwater and mostly from Europe, constitute a well-supported group containing Pleospora rubicunda and Massariosphaeria typhicola. This putative monophyletic assemblage may... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Anamorphs; Freshwater fungi; Phylogeny; Pseudoparaphyses; RDNA. |
| Ano: 2009 |
URL: http://www.repository.naturalis.nl/record/531919 |
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| Rosa,Renata da; Rubert,Marceléia; Malabarba,Luiz R.; Martins-Santos,Isabel Cristina; Giuliano-Caetano,Lucia. |
| The genus Astyanax is prominent among Characiformes, due to the large number of species found and its wide geographic distribution. In this work, Astyanax laticeps specimens from the laguna dos Patos system were cytogenetically analyzed. A diploid number of 2n = 50 chromosomes distributed into 6m+16sm+16st+12a (FN = 88) was found, without differences between males and females. A few small heterochromatin blocks were observed, besides three more conspicuous C-bands, corresponding to NORs, as confirmed by silver nitrate and CMA3 staining, FISH, and DAPI negative staining. These regions were located in a medium-sized subtelocentric and in a large subtelocentric chromosomal pair, probably because of a deletion of this region in one homologous chromosome, or... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Astyanax scabripinnis species complex; RDNA; Homologous transposition. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400007 |
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| Medeiros,Larissa A.; Ginani,Eduardo G.; Sousa,Leandro M.; Py-Daniel,Lúcia H. Rapp; Feldberg,Eliana. |
| ABSTRACT Baryancistrus xanthellus is a species from the Ancistrini tribe known commonly as "amarelinho " or "golden nugget pleco". It is one of the most popular and valued ornamental fishes due to its color pattern. Also, it is an endemic species from the Xingu River occurring from Volta Grande do Xingu, region where the Belo Monte Hydropower Dam is being built, to São Félix do Xingu. The current study aimed to cytogenetically characterize B. xanthellus . Results point to the maintenance of 2n=52, which is considered the most common condition for the tribe, and a single nucleolus organizer region (NOR). Mapping of the 18S rDNA confirmed the NOR sites, and the 5S rDNA was mapped in the interstitial position of a single chromosome pair. The 18S and 5S rDNA... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: FISH; Habitat endangered; RDNA; Volta Grande do Xingu. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200212 |
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| Oliveira,Maria Lígia M. de; Utsunomia,Ricardo; Pansonato-Alves,José Carlos; Scacchetti,Priscilla C.; Primo,Cleberson C.; Vicari,Marcelo R.; Artoni,Roberto F.; Centofante,Liano; Moreira-Filho,Orlando; Oliveira,Claudio; Foresti,Fausto. |
| Trichomycterus is a specious fish genus within Trichomycterinae and displays remarkable karyotype diversity. However, knowledge about their genomic structure and location of repetitive sequence is still limited. In order to better understand the karyotype diversification, we analyzed nine species of Trichomycterus using classical and molecular cytogenetic techniques. Results revealed a conserved diploid chromosome number of 2n=54 chromosomes in all analyzed species, although remarkable differences on the constitutive heterochromatin distribution were observed. In addition, while the 18S rDNA showed a conserved distribution pattern, the 5S rDNA sites showed a quite diverse location considering the analyzed species. Remarkably, both ribosomal genes were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Karyotype diversity; Repetitive DNA; RDNA; Supernumerary chromosomes. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200211 |
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| Maia,Natália da Costa; Souza,Patrícia Nirlane da Costa; Godinho,Bárbara Temponi Vilarino; Moreira,Silvino Intra; Abreu,Lucas Magalhães de; Jank,Liana; Cardoso,Patrícia Gomes. |
| ABSTRACT This study aimed to isolate and identify endophytic fungi from the forage grass P. maximum and evaluate their ability to inhibit the growth of plant pathogenic fungi. One sample from P. purpureum grass was also included. Surface disinfected stem fragments were used for endophytic fungal isolation. One hundred and twenty-six endophytic fungi were isolated, of which 118 were from P. maximum and eight from P. purpureum. Morphological characteristics and internal transcribed spacer (ITS) and 18S (NS) sequence comparisons identified most isolated endophytic fungi as belonging to the phylum Ascomycota, with Sarocladium being the dominant genus. The isolates were subjected to in vitro antagonism tests against pathogenic fungi, and 31 endophytic fungi... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antagonism; Grasses; Molecular identification; Plant pathogens; RDNA. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100303 |
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| Perera,María Francisca; Bertani,Romina Priscila; Arias,Marta Eugenia; Hechavarría,María de la Luz La O; Navarro,María de los Ángeles Zardón; Debes,Mario Alberto; Luque,Ana Catalina; Cuenya,María Inés; Rojas,Ricardo Acevedo; Castagnaro,Atilio Pedro. |
| ABSTRACT Sugarcane orange rust caused by Puccinia kuehnii has recently become an important disease in sugarcane crops and its spread is causing great concern to growers. In this study, we analyzed spores from symptomatic orange rust sugarcane leaves collected in multiple locations in Cuba in a 4-year-period in order to characterize morphological traits of P. kuehnii, establish an adequate molecular technique to characterize it, and determine its infection court in sugarcane. Orange rust caused by P. kuehnii was confirmed by polymerase chain reaction (PCR) and morphological characterization. AFLP markers detected high diversity in P. kuenhnii samples. Sequencing of rDNA regions, as expected, did not reveal differences and SSR markers designed for P.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AFLP; RDNA; SSR; Infection courts. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000201200 |
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| Cordeiro,Thalline Rafhaella Leite; Nguyen,Thuong Thuong Thi; Lima,Diogo Xavier; Silva,Suzana Brito Gomes da; Lima,Catarina Ferreira de; Leitão,Joana D’Arc Alves; Gurgel,Luciana Melo Sartori; Lee,Hyang Burm; Santiago,André Luiz Cabral Monteiro de Azevedo. |
| ABSTRACT During a survey of Mucorales in soil from an upland forest area in Pernambuco, Brazil, two specimens were isolated and characterized based on their morphological, physiological, and molecular data (ITS and LSU rDNA). Phylogenetic analyses of the isolates revealed that the strains URM 8209 and URM 8210 are closely related to species of Absidia. URM 8209 forms conical, subglobose, and strawberry-shaped columellae and the sporangiospores are cylindrical and ellipsoid. URM 8210 produces hemispheric, subglobose, and strawberry-shaped columellae and the sporangiospores are globose, subglobose, ellipsoid, and short cylindrical. Based on evidence obtained through analysis of datasets (LSU and ITS rDNA regions), A. saloaensis sp. nov. (URM 8209) and A.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cunninghamellaceae; Mucoromyceta; RDNA; Soil; Taxonomy. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000300549 |
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| Castro,Juliana P.; Moraes,Ana Paula; Chase,Mark W.; Santos,Angeline M. S.; Batista,Fabiane R. C.; Felix,Leonardo P.. |
| ABSTRACT Cactaceae species are karyotypically well-known with x = 11 and chromosome number variation due mainly to polyploidization. However, both assumptions are based on descriptive observations without taking an evolutionary framework of Cactaceae into account. Aiming to confirm these hypotheses in an evolutionary context, we obtained chromosome numbers for 20 species of Cactoideae, performed an extensive review of chromosome number for the family, and analyzed these data using a phylogenetic approach. The karyotypes presented here were characterized by CMA/DAPI banding, and for six species 5S and 45S rDNA sites were located. Our data, along with a survey of the literature, reinforce the long-standing hypothesis of a x = 11 as the base chromosome number... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Base chromosome number; CMA/DAPI; Dysploidy; Heterochromatin; Polyploidy; RDNA. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100135 |
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| VERA,MARÍA INÉS; MOLINA,ALFREDO; PINTO,RODRIGO; REYES,MAURICIO; ÁLVAREZ,MARCO; KRAUSKOPF,ERWIN; QUEZADA,CLAUDIA; TORRES,JORGE; KRAUSKOPF,MANUEL. |
| The seasonal adaptation of the teleost Cyprinus carpio to the cyclical changes of its habitat demands physiological compensatory responses. The process involves profound nucleolar adjustments and remarkable changes in rRNA synthesis, which affects ribosomal biosynthesis. In this context, we have demonstrated that the synthesis of several proteins involved in ribosomal biogenesis as protein kinase CK2, ribosomal protein L41 and nucleolin, as well as U3 snoRNP, are differentially regulated in summer-acclimatized carp compared to the cold-season adapted fish. To understand the mechanisms involved in the seasonal regulation of rRNA gene transcription, we have been studying the carp rDNA cistron structure. Because the cis-elements that regulate the expression... |
| Tipo: Journal article |
Palavras-chave: Ribosomal gene; RRNA; RDNA; Fish; Carp. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000200014 |
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| Registros recuperados: 39 | |
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