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| Registros recuperados: 404 | |
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| Amarilla,Leonardo D; Chiapella,Jorge O; Nagahama,Nicolás; Anton,Ana M. |
| Munroa is a morphologically heterogeneous American genus of grasses, including five species with disjunct distribution in North and South America. Dasyochloa is a monotypic grass genus, common in western North America, with a controversial taxonomic position, because it has been alternatively included in Erioneuron, Koeleria, Triodia, and Uralepis. We evaluated the relationship of Dasyochloa with Munroa using a phylogenetic analysis of qualitative and quantitative morphological data. Dasyochloa was not supported as an independent genus from Munroa, as Dasyochloa and Munroa species formed a monophyletic group defined by seven synapomorphies. On this basis, we transfer Dasyochloa to Munroa, and propose the new combination M. pulchella together with the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: America; Amphitropical distribution; Chloridoideae; Dasyochloa; Munroa; Phylogeny; Taxonomy. |
| Ano: 2013 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932013000200006 |
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| Solano Báez, Alma Rosa. |
| Existen antecedentes de que los pigmentos producidos por especies de Fusarium tienen efecto fitotóxico en plantas hospedantes de este patógeno, son inhibidores de germinación de semillas, además de actividad antibacterial. La influencia que pudieran tener en la virulencia aun no se define, por lo que en esta investigación se obtuvieron mazorcas de maíz, asintomáticas y con síntomas de pudrición de mazorca que fueron colectadas en el ciclo primavera-verano de 2008 del estado de Veracruz México. Se comparó la patogenicidad de los aislamientos de este hongo con micelio color blanco, rosado o morado. También, se compararon diferentes concentraciones de papa en medio de cultivo papa- dextrosa-agar (PDA) para observar el efecto en la pigmentación de los... |
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Palavras-chave: Semillas sintomáticas; Semillas asintomáticas; Morfología; Filogenia; Ear rot; Symptomatic seeds; Asymptomatic seeds; Morphology; Phylogeny; Maestría; Fitopatología. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/228 |
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| Bárcenas Argüello, María Luisa. |
| Cephalocereus es un género monofilético, cuya distribución es alopátrica y está restringida a la Barranca de Metztitlán (C. senilis), al Valle de Tehuacán-Cuicatlán (C. columna-trajani) y a la cuenca del río Tehuantepec (subgénero Neodawsonia, C. apicicephalium, C. nizandensis, C. totolapensis). Se desconoce qué factores condicionan este patrón de distribución endémico. El objetivo de este trabajo fue el proponer una hipótesis que explique el endemismo de sus especies, a partir de relaciones específicas entre la fisiología de los oxalatos de calcio y las propiedades de las rocas y de los suelos en los que habitan. En cada población se tomaron muestras del material parental (roca) del suelo, se removió tejido vegetal y se recolectaron semillas; estas... |
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Palavras-chave: Endemismo; Material Parental; Oxalato de calcio; Germinación; Filogenia; Endemism; Parent material; Calcium oxalate; Germination; Phylogeny; Doctorado; Botánica. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/458 |
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| Solano Báez, Alma Rosa. |
| Existen antecedentes de que los pigmentos producidos por especies de Fusarium tienen efecto fitotóxico en plantas hospedantes de este patógeno, son inhibidores de germinación de semillas, además de actividad antibacterial. La influencia que pudieran tener en la virulencia aun no se define, por lo que en esta investigación se obtuvieron mazorcas de maíz, asintomáticas y con síntomas de pudrición de mazorca que fueron colectadas en el ciclo primavera-verano de 2008 del estado de Veracruz México. Se comparó la patogenicidad de los aislamientos de este hongo con micelio color blanco, rosado o morado. También, se compararon diferentes concentraciones de papa en medio de cultivo papa- dextrosa-agar (PDA) para observar el efecto en la pigmentación de los... |
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Palavras-chave: Semillas sintomáticas; Semillas asintomáticas; Morfología; Filogenia; Ear rot; Symptomatic seeds; Asymptomatic seeds; Morphology; Phylogeny; Maestría; Fitopatología. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/228 |
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| Bárcenas Argüello, María Luisa. |
| Cephalocereus es un género monofilético, cuya distribución es alopátrica y está restringida a la Barranca de Metztitlán (C. senilis), al Valle de Tehuacán-Cuicatlán (C. columna-trajani) y a la cuenca del río Tehuantepec (subgénero Neodawsonia, C. apicicephalium, C. nizandensis, C. totolapensis). Se desconoce qué factores condicionan este patrón de distribución endémico. El objetivo de este trabajo fue el proponer una hipótesis que explique el endemismo de sus especies, a partir de relaciones específicas entre la fisiología de los oxalatos de calcio y las propiedades de las rocas y de los suelos en los que habitan. En cada población se tomaron muestras del material parental (roca) del suelo, se removió tejido vegetal y se recolectaron semillas; estas... |
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Palavras-chave: Endemismo; Material Parental; Oxalato de calcio; Germinación; Filogenia; Endemism; Parent material; Calcium oxalate; Germination; Phylogeny; Doctorado; Botánica. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/458 |
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| Tello Salgado, Isaac. |
| Actualmente se estudia la capacidad funcional a nivel molecular de los hongos basidiomicetos como modificadores de la respuesta biológica, dada la efectividad de los productos examinados de activar al sistema inmunológico, sin embargo, el origen geográfico de estos recursos, principalmente son asiáticos y europeos. Ganoderma es reconocido por su eficiente actividad en el tratamiento de varias enfermedades, principalmente las anticancerígenas y antitumorales, crece de manera silvestre en el área central de México, una de las más importantes, debido a la convergencia de las regiones Neártica y Neotropical, lo cual da como resultado un amplia diversidad de recursos genéticos. En la presente investigación se aislaron 66 cepas del género Ganoderma producto de... |
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Palavras-chave: Caracterización; Cultivo; Filogenia; Ganoderma; Recurso Genético; Characterization; Cultivation; Phylogeny; Genetic resource; Doctorado; EDAR; Estrategias para el Desarrollo Agrícola Regional. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/372 |
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| Magomere,Titus O; Obukosia,Silas D; Mutitu,Eunice; Ngichabe,Christopher; Olubayo,Florence; Shibairo,Solomon. |
| This study was undertaken to characterize the alpha subgroup of the proteobacteria causing the huanglongbing (HLB) disease of citrus from three different ecological zones of Kenya namely the Lower highlands (LH2, LH3, 1800-1900 m above sea level); Upper midlands (UM3, UM4, 1390-1475m), Lower midlands (LM5, LM4, LM3 of 1290-1340-1390m), by isolation and sequencing DNA encoding the L10 and L12 ribosomal proteins and the intergenic region. A 7I6-basepair DNA fragment was amplified and sequenced and consisted of 536 basepairs of DNA encoding the L10 protein, 44 basepairs of DNA intergenic region and 136 basepairs of DNA that partially encodes the L12 protein. Sequences of rpL10/L12 protein genes from Kenyan strains were 98% and 81% similar to the South African... |
| Tipo: Journal article |
Palavras-chave: Citrus greening disease; DNA sequencing; Intergenic regions; Phylogeny; Ribosomal protein genes. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200005 |
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| Schaefer,Carl W.. |
| Why are the subfamily relationships of Triatominae (Hemiptera: Reduviidae) important?-This question is really two: Is Triatominae a phylogenetically valid monophyletic subfamily; and, if it is, to what other reduviid subfamilies is it most closely related? If the answer to the first question is Yes, then what one knows about one member of Triatominae may be true for other members; if the answer is No, then no such prediction can be made. Because many members of Triatominae are of medical importance, such predictions are vitally (literally) important. For the same reason, knowledge of the subfamily relatives of medically important triatomines is important: For here too predictions about one related member can be based on knowledge of others. These points... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Harpactocorinae; Linshcosteus; Phylogeny; Peiratinae; Reduviinae. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0328-03812005000100002 |
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| Ortí,Guillermo; Sivasundar,Arjun; Dietz,Kelly; Jégu,Michel. |
| Previous studies based on DNA sequences of mitochondrial (mt) rRNA genes showed three main groups within the subfamily Serrasalminae: (1) a "pacu" clade of herbivores (Colossoma, Mylossoma, Piaractus); (2) the "Myleus" clade (Myleus, Mylesinus, Tometes, Ossubtus); and (3) the "piranha" clade (Serrasalmus, Pygocentrus, Pygopristis, Pristobrycon, Catoprion, Metynnis). The genus Acnodon was placed as the sister taxon of clade (2+3). However, poor resolution within each clade was obtained due to low levels of variation among rRNA gene sequences. Complete sequences of the hypervariable mtDNA control region for a total of 45 taxa, and additional sequences of 12S and 16S rRNA from a total of 74 taxa representing all genera in the family are now presented to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Piranhas; Pacus; D-loop; Phylogeny; Bayesian inference. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200030 |
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| Osorio,Marina Borges; Bücker-Neto,Lauro; Castilhos,Graciela; Turchetto-Zolet,Andreia Carina; Wiebke-Strohm,Beatriz; Bodanese-Zanettini,Maria Helena; Margis-Pinheiro,Márcia. |
| Environmental stresses caused by either abiotic or biotic factors greatly affect agriculture. As for soybean [Glycine max (L.) Merril], one of the most important crop species in the world, the situation is not different. In order to deal with these stresses, plants have evolved a variety of sophisticated molecular mechanisms, to which the transcriptional regulation of target-genes by transcription factors is crucial. Even though the involvement of several transcription factor families has been widely reported in stress response, there still is a lot to be uncovered, especially in soybean. Therefore, the objective of this study was to investigate the role of bHLH and trihelix-GT transcription factors in soybean responses to environmental stresses. Gene... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Drought; Gene expression; Glycine max; Phylogeny; Plant-microbe interactions. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000200005 |
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| Bouktila,Dhia; Khalfallah,Yosra; Habachi-Houimli,Yosra; Mezghani-Khemakhem,Maha; Makni,Mohamed; Makni,Hanem. |
| Proteins containing nucleotide binding sites (NBS) encoded by plant resistance genes play an important role in the response of plants to a wide array of pathogens. In this paper, an in silico search was conducted in order to identify and characterize members of NBS-encoding gene family in the tribe of Triticeae. A final dataset of 199 sequences was obtained by four search methods. Motif analysis confirmed the general structural organization of the NBS domain in cereals, characterized by the presence of the six commonly conserved motifs: P-loop, RNBS-A, Kinase-2, Kinase-3a, RNBS-C and GLPL. We revealed the existence of 11 distinct distribution patterns of these motifs along the NBS domain. Four additional conserved motifs were shown to be significantly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: NBS domain; Data mining; Phylogeny; Plant resistance genes; Triticeae. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000400017 |
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| Azevedo,Marisa F.C.; Oliveira,Claudio; Pardo,Belén G.; Martínez,Paulino; Foresti,Fausto. |
| The fish order Pleuronectiformes, composed of 14 families, has two suborders: Psettodoidei (with one family) and Pleuronectoidei (with thirteen families). The relationships among families of Pleuronectoidei and among the genera of their families have extensively been debated and a consensus has not yet been reached. In the present study, partial sequences of the 12S and 16S mitochondrial rRNA genes were obtained from 19 species belonging to the families Achiridae, Bothidae, Cynoglossidae, Paralichthyidae, Pleuronectidae, Scophthalmidae, and Soleidae. Additional sequences of 42 pleuronectiform species were obtained from GenBank. Phylogenetic analyses were conducted by the methods of maximum-parsimony, maximum-likelihood and Bayesian inference. Our results... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phylogeny; Molecular systematics; Mitochondrial DNA; Fish evolution; Flatfishes. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200023 |
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| Hilsdorf,Silva; Oliveira,Claudio; Lima,Flávio César Thadeo de; Matsumoto,Cristianne Kayoko. |
| The genus Brycon, the largest subunit of the Bryconinae, has 42 valid species distributed from southern Mexico to the La Plata River in Argentina. Henochilus is a monotypic genus, comprising a single species (H. wheatlandii) found in the upper Rio Doce basin. In the present study, partial sequences of the mitochondrial gene 16S were obtained for fifteen species of Brycon and for Henochilus wheatlandii. The results showed that the genus Brycon is paraphyletic, since Henochilus is the sister-group of B. ferox and B. insignis. The most basal species analyzed were the trans-Andean species B. henni, B. petrosus, and B. chagrensis. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phylogeny; Molecular systematics; Mitochondrial DNA; Fish evolution; Systematic. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200034 |
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| Tagliaro,Claudia Helena; Schneider,Horacio; Sampaio,Iracilda; Schneider,Maria Paula Cruz; Vallinoto,Marcelo; Stanhope,Michael. |
| The systematics of the subfamily Callitrichinae (Platyrrhini, Primates), a group of small monkeys from South America and Panama, remains an area of considerable discussion despite many investigations, there being continuing controversy over subgeneric taxonomic classifications based on morphological characters. The purpose of our research was to help elucidate the phylogenetic relationships within the monkey genus Saguinus (Callitrichinae) using a molecular approach to discover whether or not the two different sections containing hairy-faced and bare-faced species are monophyletic, whether Saguinus midas midas and Saguinus bicolor are more closely related than are S. midas midas and Saguinus midas niger, and if Saguinus fuscicollis melanoleucus and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saguinus; Callitrichinae; ND1; Phylogeny; MtDNA; Conservation. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000100009 |
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| Registros recuperados: 404 | |
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