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| Registros recuperados: 10 | |
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| Sánchez Viveros, Gabriela. |
| Esta investigación evaluó algunos mecanismos de tolerancia del simbiosistema Azolla-Anabaena azollae ante agua contaminada con arsénico (As+5) y/o cobre (Cu2+). Para lo anterior, se plantearon seis fases experimentales: 1) identificar molecularmente a nivel de especie a diez colectas de Azolla, 2) evaluar la capacidad de acumulación de As+5 y los efectos tóxicos del metaloide en el simbiosistema Azolla-Anabaena azollae, 3) determinar la influencia del As+5 en la concentración de nueve elementos en las frondas de Azolla filiculoides, 4) evaluar el efecto del Cu2+ sobre la actividad fotosintética y permeabilidad de la membrana de Azolla filiculoides y Azolla caroliniana, 5) comparar la capacidad de acumulación de Cu2+ en dos especies de Azolla y, 6) conocer... |
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Palavras-chave: Contaminación; Fitorremediación; Helechos; Metales pesados; Metaloides; Contamination; Ferns; Heavy metals; Metalloids; Phytoremediation; Edafología; Doctorado. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/632 |
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| Cárdenas, G.G.; Lehtonen, S.; Tuomisto, H.. |
| Salpichlaena is a distinctive fern genus characterised by 2-pinnate climbing fronds with indeterminate growth. The number of species in the genus has been a matter of debate. Taxonomic studies are made difficult by within-frond variability in pinna morphology and size, and by herbarium material being incomplete. We systematically documented 62 morphological traits in 283 herbarium specimens and sequenced 52 Salpichlaena and 11 outgroup specimens. DNA sequences included plastid genes (rbcL, rpoC1 and rps4), intergenic spacers (rps4-trnS, trnHpsbA and trnG-trnR) and a nuclear gene (pgiC). Phylogenetic analyses based on the plastid markers divided the samples into six major clades. We recognise the three deepest clades as distinct species (S. hookeriana, S.... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Ferns; Hybrid; Neotropics; Phylogeny; Salpichlaena; Systematics; Taxonomy. |
| Ano: 2019 |
URL: http://www.repository.naturalis.nl/record/673190 |
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| Vasco, A.. |
| The present paper provides a monograph of Elaphoglossum subsect. Muscosa, a monophyletic group supported by molecular phylogenetic analyses. The monograph includes keys, full synonymy, descriptions, representative specimens examined, an index to collectors’ names and numbers, illustrations, spore photomicrographs, and distribution maps for all species. Morphologically, the subsection is recognized by scaly rhizomes, petioles and laminae, obtuse leaf apices, and spores that are about twice as long as in other species of Elaphoglossum. Fifteen species of subsect. Muscosa are here recognized, with no subspecies or varieties. All of the species are Neotropical occurring from southern Mexico to Bolivia and Southeastern Brazil, with three species in the West... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Ferns; Floristics; Pteridophytes; Taxonomy. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/525366 |
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| RUOKOLAINEN,Kalle; TUOMISTO,Hanna; RÍOS,Richer; TORRES,Alberto; GARCÍA,Mildred. |
| Floristic composition of twelve plots, 25 m by 25 m, was studied in the Peruvian Amazonia in order to investigate if it were possible to use a part of the flora as an indicator of the changes observed in other components of the flora. Floristic similarities among the plots were calculated using six different taxonomic or physiognomic groups: ferns, the families Melastomataceae and Myristicaceae, trees thicker than 2.5 cm diameter at breast hight (DBH), trees between 2.5 cm and 5 cm DBH, and trees thicker than 5 cm DBH. The similarities were used for agglomerati ve classifications of the plots and for analyzing the correlations among the different groups of plants with Mantel's test. The results indicate that floristic changes were similar in all of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazonia; Ferns; Mantel's test; Melastomataceae; Myristicaceae; Phytosociology. |
| Ano: 1994 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671994000200031 |
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| Matos,Fernando Bittencourt. |
| The fern genus Elaphoglossum has received a great deal of attention in Brazil over the last two centuries. Nevertheless, many of the early names remain inadequately typified. In this paper, the nomenclature of some Brazilian species of Elaphoglossum sect. Polytrichia is discussed under the rules and recommendations of the International Code of Nomenclature for algae, fungi, and plants. Lectotypes are designated for the following names: Acrostichum amplissimum Fée; A. apodum Kaulf. var. sprucei Baker; A. glaziovii Fée; A. lindbergii Mett. ex Kuhn; A. prestonii Baker; Elaphoglossum spannagelii Rosenst.; and Elaphoglossum ulei H. Christ. Most of these types were collected in Brazil during the 19th century and are now preserved in several European herbaria. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ferns; Neotropics; Nomenclature; Taxonomy; Types. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300013 |
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| Ambrósio,Sandra Tereza; Melo,Natoniel Franklin de. |
| The present work reports the effect of different pH and sucrose concentrations on in vitro propagation of Nephrolepis biserrata. Fronds aseptically obtained from stolon segment culture were cultivated in MS semi-solid medium supplemented with 0, 15, 30, 45 and 60g.L-1 sucrose and pH adjusted to 3, 5, 7 and 9, in a factorial design. Frond number and length, pinnae number, raquis length and diameter, fresh and dry matter weight were measured. Inhibition of shoot and leaf regeneration was observed in all the pH treatments in the absence of sucrose. On the other hand, when sucrose was added to the medium, the shoot number increased, reaching the maximum average values of 51.25 and 38.25 shoot per explant at pH 5 and 7, respectively. Sucrose concentrations from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ferns; Ornamental plants; Tissue culture. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062004000400011 |
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| Hiendlmeyer,Rosane; Randi,Aurea Maria. |
| Light is a limiting factor for fern stablishment because it controls germination of light sensitive spores. The aim of this work was to study the effect of light levels on spore germination in two ornamental ferns native to the Atlantic forest, under natural conditions. Cyathea delgadii is a tree fern and Blechnum brasiliense, a subarborescent fern. The effect of light levels was analyzed in April and July/2003, in Florianópolis, Santa Catarina state, Brazil. Sterilized spores were sown in Erlenmeyer flasks containing mineral culture medium with macronutrients, iron, and benomyl 0.01%. The Erlenmeyer flasks were kept in 50 cm³ boxes covered with black shade netting, which gave 5, 22, 42, and 62% natural light. Irradiance and temperature were scored daily... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ferns; Germination; Light levels; Photoinhibition; Spores. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000400015 |
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| YAÑEZ,AGUSTINA; MARQUEZ,GONZALO J.; MORBELLI,MARTA A.. |
| ABSTRACT The genera of Dennstaedtiaceae have sporophytes with very different morphological characteristics between each other, and this feature has made difficult the systematic circumscription of the family. This reason makes necessary the study of new characters that allow a better understanding of the relations within the group. The spore morphology and wall structure of Blotiella lindeniana, Histiopteris incisa and Paesia glandulosa from the Paranaense Phytogeographic Province were studied using light microscope, and scanning and transmission electron microscope. The exospore has two layers and, according to the species, the exospore surface bears pila, echinae, verrucae, bacula and tubercles. The perispore has two or three layers and its surface is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ferns; Morphology; South America; Sporoderm; Ultrastructure. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602731 |
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| Barros,Irene de Araújo; Araújo,Welington Luiz; Azevedo,João Lúcio. |
| Endophytic bacteria associated with the fern Dicksonia sellowiana were investigated. The bacterial communities from the surface-sterilized pinnae and rachis segments of the plants from the Brazilian Atlantic Rainforest that grew in native field conditions were compared with the bacterial communities from plants grown in greenhouses and plants that were initially grown in greenhouses and then transferred to the forest. From 540 pinnae and 540 rachis segments, 163 (30.2%) and 346 (64.2%) were colonized by bacteria, respectively. The main bacterial genera and species that were isolated included Bacillus spp. (B. cereus, B. megaterium, B. pumilus and B. subtilis), Paenibacillus sp., Amphibacillus sp., Gracilibacillus sp., Micrococcus sp. and Stenotrophomonas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazilian Tropical forest; Ferns; 16S rDNA; Bacterial diversity; Bacillus. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000400014 |
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| Registros recuperados: 10 | |
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