Consulta: subjectFacets:"Morphogenesis"
Registros recuperados: 48
Data/hora: 09/06/2024 02:50:36

In vitro plant regeneration system for common bean (Phaseolus vulgaris): effect of N6-benzylaminopurine and adenine sulphate
Provedor de dados: 69
Autores: Gatica Arias,Andrés M; Muñoz Valverde,Jenny; Ramírez Fonseca,Pilar; Valdez Melara,Marta.
A method for regeneration of the commercially important common bean (Phaseolus vulgaris ) using N6-benzylaminopurine(BAP) and adenine sulphate (AS) was established. Embryogenic axes of the Costa Rican common bean cultivars Bribrí, Brunca, Guaymí, Huetar and Telire were cultured on Murashige and Skoog medium supplemented with 100 mgl-1 myo-inositol, 1 mgl-1 thiamine, 30 gl-1 sucrose, BAP (0, 5 and 10 mgl-1), AS (0, 20 and 40 mgl-1) and 8 gl-1 agar. Regardless of the concentration of BAP and AS in the induction medium, the number of shoots and leaves differed significantly among the common bean cultivars evaluated. The higher average of shoots was obtained for Brunca &gt; Telire &gt; Bribrí &gt; Guaymí &gt; Huetar. Moreover, independently of the cultivar,...
Tipo: Journal article
Palavras-chave: Common bean; In vitro culture; Morphogenesis; Phaseolus vulgaris L.; Plant growth regulators.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000100006

AgNO3: a potential regulator of ethylene activity and plant growth modulator
Provedor de dados: 69
Autores: Kumar,Vinod; Parvatam,Giridhar; Ravishankar,Gokare Aswathanarayana.
The aim of this review is to critically analyze the role of silver nitrate (AgNO3) in modulating plant growth and development. In recent years, basic studies on ethylene regulation opened new vistas for applied research in the area of micro-propagation, somatic embryogenesis, in vitro flowering, growth promotion, fruit ripening, and sex expression. Silver nitrate has proved to be a very potent inhibitor of ethylene action and is widely used in plant tissue culture. Few properties of silver nitrate such as easy availability, solubility in water, specificity and stability make it very useful for various applications in exploiting plant growth regulation and morphogenesis in vivo and in vitro. Silver ion mediated responses seem to be involved in polyamines,...
Tipo: Journal article
Palavras-chave: Calcium; Ethylene; Morphogenesis; Polyamines; Silver nitrate; Somatic embryogenesis.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200008

Physiological reorganization in the hypotrich ciliate Apoamphisiella vernalis (Protista, Ciliophora, Hypotricha)
Provedor de dados: 76
Autores: Castro,Larissa A. M. de; Silva-Neto,Inácio D. da; Paiva,Thiago da S.
ABSTRACT Physiological reorganization is described for the first time for the hypotrich ciliate genus Apoamphisiella Foissner, 1997, based on a population of A. vernalis (Stokes, 1887) Berger, 2006 collected from an eutrophic pond in the state of Minas Gerais, Brazil. Stomatogenesis is epiapokinetal, and the cirral pattern reorganizes from six typical fronto-ventral-transverse primordia, plus at least one short primordium located between IV and V. Primordia I and II originate from disaggregating undulating membranes and buccal cirrus, respectively; primordium III originates from left frontoventral cirrus plus a streak of basal bodies extending from the anterior end of oral primordium; primordium IV and the short extra primordia are formed from basal bodies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Dorsomarginalia; Morphogenesis; Ontogeny; Spirotrichea.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212017000100212

Intake of high levels of vitamin A and polyunsaturated fatty acids during different developmental periods modifies the expression of morphogenesis genes in European sea bass (Dicentrarchus labrax)
Provedor de dados: 5
Autores: Villeneuve, Laure; Gisbert, Enric; Moriceau, Jacques; Cahu, Chantal; Zambonino, Jose-luis.
The effect of the feeding period on larval development was investigated in European sea bass larvae by considering the expression level of some genes involved in morphogenesis. Larvae were fed a control diet except during three different periods (period A: from 8 to 13 d post-hatching (dph); period B: from 13 to 18 dph; period C: from 18 to 23 dph) with two compound diets containing high levels of vitamin A or PUFA. European sea bass morphogenesis was affected by these two dietary nutrients during the early stages of development. The genes involved in morphogenesis could be modulated between 8 and 13 dph, and our results indicated that retinoids and fatty acids influenced two different molecular pathways that in turn implicated two different gene cascades,...
Tipo: Text
Palavras-chave: Retinoid pathway; Morphogenesis; Vitamin A; PUFA; Sea bass larvae.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1215.pdf

Morphogenese sexuelle et regulation hormonale de l'activite genitale chez la crevette Penaeus japonicus en elevage
Provedor de dados: 5
Autores: Laubier, A; Chim, Liet; Payen, G.
A study of the sexual physiology of penaeid prawns essentially based upon Penaeus japonicus is performed in both descriptive and experimental ways, using the controlled rearings conducted at the Centre Oceanologique de Bretagne (CNEXO-COB), Brest. Sexual morphogenesis is described. This preliminary study enables definition of simple criteria for determination of the stage of genital development of the prawns during their growth. The neuroendocrine control of the genital system development is studied, using eyestalks ablations and male eyestalks extracts injection in prawns belonging to the same sex. A biochemical criterion as a test of the effect of eyestalks extract injections on the genital system development is discussed. The evolution of the specific...
Tipo: Text
Palavras-chave: Penaeus japonicus; Malacostraca; Controlled conditions; Neurosecretion; Cytochemistry; Ultrastructure; Sexual reproduction; Sexual maturity; Sexual dimorphism; Endocrinology; Eyestalk extirpation; Gametogenesis; Sex determination; Morphogenesis; Contrôle neuroendocrine de la reproduction; Morphogénèse sexuelle; Physiologie sexuelle; Élevage contrôlé; Penaeus japonicus.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1188.pdf

Effets de l'ablation des pedoncules oculaires, au cours des stades Zoe 3 et Zoe 4 sur la mue de la metamorphose de Palaemonetes varians (Leach) (Crustacea, Decapoda)
Provedor de dados: 5
Autores: Leroux, Aurelien.
The presence of two (or at least one) eyestalks is required for inducing a complete, monoecdysial metamorphosis in Palaemonetes varians . This induction is performed, at 20 degree C, in about 20 hours situated on either side of the third larval moult when metamorphosis occurs at the fourth one. The mechanism of induction is discussed.
Tipo: Text
Palavras-chave: Palaemonetes varians; Malacostraca; Morphogenesis; Developmental stages; Moulting.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/acte-1384.pdf

Problemes de morphogenese cuticulaire chez les crustaces
Provedor de dados: 5
Autores: Bouligand, Y.
The crustacean integument is an excellent model for the study of cuticular morphogenesis, at different organization levels. At the supermolecular level, subunits of chitin and protein assemble and show the organization of a stabilized liquid crystal. At higher levels corresponding to cells and cells populations, several controls are involved in the fine architecture of the epicuticle, in the mineral distribution and in characters which concern the whole animal, such as isometric or allometric growth.
Tipo: Text
Palavras-chave: Crustacea; Mineralization; Morphogenesis; Cells; Molecular structure.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/acte-1372.pdf

Action des chocs thermiques sur le developpement d'Artemia
Provedor de dados: 5
Autores: Hernandorena, A.
Heat shocks at 40 degree were delivered to Artemia at the end of embryonic development and at the beginning of postembryonic development and their effects on subsequent development examined. Heat shocks delivered during preemergence development have no effect on subsequent development. Heat shocks delivered to newly hatched nauplii induce anomalies on the morphogenesis of thoracic and genital appendages. The induction of morphological anomalies by thermal conditions prevailing during early larval life makes it easier to integrate the morphological effects previously induced by nutritional conditions imposed to older feeding stages.
Tipo: Text
Palavras-chave: Artemia; Branchiopoda; Morphogenesis; Embryonic development.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/acte-1377.pdf

Mise en place de l'epicuticule chez le crabe Carcinus maenas
Provedor de dados: 5
Autores: Compere, P.
The epicuticle of the crab Carcinus maenas consists in three distinct layers: the fibrous surface coat, the cuticulin layer and the inner epicuticle. Short segments of the cuticulin layer are first deposited at the top of dense plaques of the ectodermal cell membrane. Their assembling gives rise to a five-layered continuous structure of about 37 nm thick. Afterwards, the inner epicuticle is added inside close to the cuticulin layer but dense plaques are not concerned with the phenomenon. The deposition of the fibrous surface coat outside to the cuticulin layer takes place only during late postmolt stages (D2-D3). In mineralized cuticles, this typical epicuticle structure persists during all intermolt long.
Tipo: Text
Palavras-chave: Carcinus maenas; Malacostraca; Morphogenesis.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/acte-1375.pdf

Les cellules folliculaires secondaires de la crevette Macrobrachium rosenbergii (Decapoda, Palaemonidae): Mise en evidence d'un reseau tubulaire implique dans les echanges entre l'hemolymphe et l'ovocyte
Provedor de dados: 5
Autores: Meuzy, J; Jugan, P; Zerbib, C.
The epithelial cells of the ovary secondary follicles have been studied in the prawn Macrobrachium rosenbergii using electron microscope and horseradish peroxidase. A network of circomvolutioned and anastomosed tubules, measuring about 0.15 mu m in diameter, communicates with the extracellular space. This tubular network is a temporary structure which extensively increases the permeability of the follicular epithelium.
Tipo: Text
Palavras-chave: Macrobrachium rosenbergii; Malacostraca; Ultrastructure; Oogenesis; Morphogenesis; Epithelia; Ovaries; Vitellogénine; Réseau tubulaire; Epithelium folliculaire; Vitellogenèse; Macrobrachium rosenbergii.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1189.pdf

Cloning of endothelin-1 (ET-1) from European sea bass (Dicentrarchus labrax) and its gene expression analysis in larvae with retinoic acid-induced malformations
Provedor de dados: 5
Autores: Geay, Florian; Darias, Maria J.; Santigosa, E.; Desbruyeres, Elisabeth; Quazuguel, Patrick; Zambonino, Jose-luis; Cahu, Chantal; Mazurais, David.
It is known in vertebrates that endothelin-1 (ET-1) plays a key role ill morphogenesis whose expression level greatly influences the development of craniofacial malformations. In the Present study, the complete cDNA fragment encoding a precursor of endothelin-1, the preproendothelin-1 (PPET1), was cloned by RACE-PCR from European sea bass. The cDNA encoded a 199 amino acid polypeptide that was composed of the "mature" and "big" ET-1. Relative ET-1 expression levels were investigated in European sea bass larvae fed microparticulate diets containing the standard amount (0.08 g retinol/kg diet: group N) or all excess of retinoic acid which induces skeletal malformations (0.5 g retinol/kg diet: group RA). Real-time reverse transcriptor polymerase chain...
Tipo: Text
Palavras-chave: European sea bass; Retinoic acid; Morphogenesis; Gene expression; Endothelin 1.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6172.pdf

Owen revisited: a reappraisal of morphology in evolutionary biology
Provedor de dados: 16
Autores: Minelli, Alessandro; Schram, Frederick R.
A new analysis within the framework of developmental genetics provides both raw data and theoretical support to the “old” morphology and suggests a new, more predictive, approach to the concept of homology. We distinguish between “positional homologues” and “structural homologues” as independent components of the more general concept of homology. We discuss some general patterns seen in the anatomy of animals and in their morphogenesis. Slack et al. (1993) advanced the concepts of the “zootype”, a particular spatial pattern of gene expression, and the “phylotype”, a particular stage of embryonic development that expresses the zootype. We build upon these concepts and expand them. This allows us to propose some additional phylotypes (arthrotype, cyclotype,...
Tipo: Article / Letter to the editor
Palavras-chave: Homology; Phylotype; Macroevolution; Morphogenesis.
Ano: 1994
URL: http://www.repository.naturalis.nl/record/504249

Observations by Scanning Electron Microscopy of Surface Events during Encystment and Excystment in Gastrostyla steinii (Cliophora, Hypotrichida)
Provedor de dados: 19
Autores: Knaippe, Fatima; Tetley, Laurence; Mullin, Margaret.
The surface of the protozoan Gastrostyla steinii undergoes profound morphological changes during the encystment and excystment processes. Resorption of the various ciliary structures occurs progressively during differentiation of the free living cell into the resting cyst. In ciliar disassembly, layers of the cyst wall are deposited on the surface of the encysting organism. At excystation, the hatching trophozoite emerges from the protective wall through a cleft after the formation of the ciliary organelles.
Palavras-chave: Ciliate/ excystation; Encystation; Morphogenesis.
Ano: 1992
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/165

Desarrollo larval de merluza (Merluccius hubbsi) considerando aspectos ecomorfologicos
Provedor de dados: 20
Autores: Betti, P.
The ontogeny of the first stages of development of hake (Merluccius hubbsi)considering yolksac larvae, preflexion larvae, larvae in flexion, postflexion larvae, transformation larvae and posttransition juveniles, is described. Fish larvae and posttransition juveniles were collected in the north Patagonian area, between 42° and 46°S, from surroundings of the coast to the 100 m isobath (Argentine Sea, SW Atlantic). The larvae were collected between December and February, and the posttransition juveniles, in April and June since 1989 to 2004. The morphometrics variables and pigmentation were recorded in 127 larvae y 41 posttransition juveniles ranging in total length (TL)from 2.0 to 35.0 mm. Additionally, the openning of the mouth was calculated and...
Tipo: Theses and Dissertations
Palavras-chave: Fish larvae; Juveniles; Ontogeny; Morphogenesis; Morphogenesis; Fish larvae; Juveniles; Ontogeny; Http://aims.fao.org/aos/agrovoc/c_4943; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_25393; Http://aims.fao.org/aos/agrovoc/c_12941.
Ano: 2005
URL: http://hdl.handle.net/1834/2599

Die Gelege karibischer Vertreter aus den Uberfamilien Strombacea, Naticacea und Tonnacea (Mesogastropoda) sowie Beobachtungen im Meer und Aquarium
Provedor de dados: 20
Autores: Bandel, K.
Se presentan datos con respecto a la forma de vida y del ambiente de 13 mesogastropodos superiores. Los huevos de Strombus gigas, S. pugilis, Polinices lacteus, P. hepaticus, Natica livida, N. canrena, Morum oniscus, Cypraecassis testiculus, Charonia variegata, Cymatium nicobaricum, C. pileare, Bursa cubaniana y Tonna galea se describen en detalle y se caracterizan las larvas recién nacidas. En la mayoría de las especies mencionadas se pudo determinar el tiempo de desarrollo desde el huevo hasta su nacimiento. Los huevos aquí descritos son comparados con lo que se conoce de la literatura, según sus caracteres morfológicos se distinguen seis tipos de cápsulas y masas de huevos.
Tipo: Journal Contribution
Palavras-chave: Marine molluscs; Spawning; Embryology; Morphogenesis; Malacology; Spawning; Embryology; Morphogenesis; Malacology; Http://aims.fao.org/aos/agrovoc/c_14490; Http://aims.fao.org/aos/agrovoc/c_10587; Http://aims.fao.org/aos/agrovoc/c_4943; Http://aims.fao.org/aos/agrovoc/c_4528.
Ano: 1976
URL: http://hdl.handle.net/1834/3291

Somatic embryogenesis and plant regeneration in elite clones of Theobroma cacao
Provedor de dados: 86
Autores: Silva,Thiago Édson Ribeiro da; Cidade,Luciana Cardoso; Alvim,Fátima Cerqueira; Cascardo,Júlio Cézar de Mattos; Costa,Marcio Gilberto Cardoso.
The objective of this work was to evaluated a procedure for somatic embryogenesis and regeneration of cacao (Theobroma cacao L.) elite clones. Petal explants from cacao clones TSH 565 and TSH 1188 were cultured on PCG and SCG-2 media, for calli growth. Somatic embryos were formed on the surface of embryogenic calli after transfer to embryo development (ED) medium. Clone TSH 565 showed a higher embryogenic potential than TSH 1188. The best combination of carbon source for embryo induction in ED medium was genotype-specific. Embryogenic callus formations increased in micropore tape-sealed Petri dishes, irrespective of cacao genotype. Mature somatic embryos were successfully converted into plantlets.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biotechnology; Cacao; Gas exchange; Micropropagation; Morphogenesis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001000024

Tissue culture parameters in sweet orange cultivars
Provedor de dados: 86
Autores: Mendes,Amanda Ferreira da Silva; Cidade,Luciana Cardoso; Manzoli,Gabrielle Novais; Otoni,Wagner Campos; Soares Filho,Walter dos Santos; Costa,Marcio Gilberto Cardoso.
The objective of this work was to establish tissue culture parameters for gene transfer in sweet orange cultivars. Epicotyl explants with different ages were cultured with 6-benzylaminopurine (BAP), kanamycin and hygromycin. Shoots were cultured with alpha-naphthaleneacetic acid (NAA) alone or in combination with indole-3-butyric acid (IBA). The requirement of BAP for shoot development was genotype-specific. Epicotyl explants from 35-day-old seedlings produced significantly more shoots per explant in 'Pêra'. Kanamycin inhibited shoot regeneration for the most cultivars. The percentage of shoots that produced roots in 'Pêra' was significantly higher in medium with NAA and IBA than with NAA alone.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Biotechnology; Gene transfer; Morphogenesis; Regeneration.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000800020

Plant regeneration of Mullein Nightshade (Solanum donianum Walp.) from leaf explants
Provedor de dados: 85
Autores: O'Connor-Sánchez,A; Domínguez-May,AV; Keb-Llanes,MA; Peña-Ramírez,YJ; Herrera-Valencia,VA.
A reliable protocol for plant regeneration of Mullein Nightshade (Solanum donianum Walp.) was developed from in vitro leaf explants. They were cultured on Murashige and Skoog semisolid medium, supplemented with several combinations of zeatin riboside and 1-naphthaleneacetic acid for shoot regeneration. The formulation that originated most shoots per explant was 8.5 µM zeatin riboside in absence of 1-naphthalene acetic acid. Explants with shoots were transferred to Murashige and Skoog medium, with half the normal salt concentration and without plant growth regulators for elongation. Elongated shoots were individualized, and they rooted readily in half-strength Murashige and Skoog medium without plant growth regulators. The regenerated plants, which were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphogenesis; Organogenesis; Drought-tolerant species; Zeatin riboside.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000100005

Weed Interference in the Establishment of Urochloa ruziziensis
Provedor de dados: 87
Autores: LOURENÇO,A.A.; MOTA,R.V.; SANCHES,J.L.; MARQUES,R.F.; MARCHI,S.R.
ABSTRACT: This research aimed to study weed interference relationship on morphogenesis, yield, and greenhouse gas production potential of Urochloa ruziziensis under pasture renovation conditions. The experimental design was a randomized block design with four replications. Treatments consisted of seven coexistence periods: 0, 15, 30, 45, 60, 75, and 90 days after emergence (DAE). The following morphological parameters were analyzed: number of tillers, number of leaves, photosynthetically active leaf blade biomass, fresh stem biomass, dead material biomass, and total dry biomass. In vitro analyses of methane (CH4) and carbon dioxide (CO2) production were also carried out. The results were submitted to analysis of variance by the F-test, and the test of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pasture renovation; Weed competition; Morphogenesis; Carbon dioxide; Methane.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100272

Ultrastructural analysis of in vitro direct and indirect organogenesis
Provedor de dados: 88
Autores: Appezzato-da-Glória,Beatriz; Machado,Silvia R.
This is a comparative study of the ultrastructural characteristics of the cells involved in the organogenesis in vitro of Bauhinia forficata Link (indirect system) and Glycine max (L.) Merrill (direct system). B. forficata calli after 30 days culture and G. max meristemoids after 10 days culture were prepared for ultrastructural analysis using conventional methods. Concentrically arranged rough endoplasmic reticulum (RER) and plastids containing starch grains were seen during G. max and B. forficata organogenesis. The amitotic process, the presence of plastids around the nucleus and nuclear envelope with conspicuous pores were found in B. forficata.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amitosis; Leguminous; Meristemoids; Morphogenesis.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000300004

Genotype-environment interaction on the density of peach buds cultivated in a humid subtropical climate
Provedor de dados: 94
Autores: Penso,Gener Augusto; Citadin,Idemir; Scariotto,Silvia; Danner,Moeses Andrigo; Sachet,Marcos Robson.
Abstract  Studies on the interaction of genetic and environmental effects on floral morphogenesis in peach trees grown in humid subtropical climate provide important information related to adaptation and for assisting in the selection of new cultivars. This study aimed to verify the genetic and environmental effects and to identify peach tree genotypes with greater shoot length, vegetative bud, flower bud density adaptability and stability under humid subtropical climate conditions. Twelve peach tree genotypes were evaluated over a period of eight years, during the growing season (2006/07 to 2013/14) in Pato Branco-PR, Brazil. Data were collected for shoot length (SL), flower bud density (FBD) and vegetative bud density (VBD), as well as temperature,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus persica L. Batsch; GGE Biplot; Genetic improvement; Adaptability and stability; Morphogenesis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000500801

Nitrogen fertilization on the establishment of Arachis pintoi cv. Belmonte
Provedor de dados: 96
Autores: Sales,Rita Manuele Porto; Fries,Daniela Deitos; Pires,Aureliano José Vieira; Bonomo,Paulo; Santana,Sérgio Adorno de; Santos,Iasminy Silva; Rocha,Aline Viana; Sobral,Daiane Maria Pinto Ladeia.
The objective was to evaluate the effect of nitrogen fertilization on the establishment of forage peanut (Arachis pintoi cv. Belmonte) propagated vegetatively. The experiment was conducted in a greenhouse in a completely randomized design with treatments arranged in a 2 × 4 factorial design - two ages (70 and 85 days after planting) and four nitrogen doses (0, 40, 80 and 120 kg/ha) - with four replications. Morphogenetic and structural characteristics and production were evaluated. The nitrogen accelerated the establishment of the forage peanut with an increase in dry weight of green leaves and stolons. The greatest length of stolons (48.0 cm) was obtained with a dose equivalent to 86 kg N/ha and higher density of stolons (20 stolons/vase) between 78 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass partitioning; Forage peanut; Legume; Morphogenesis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001100001

Biomass flow in massai grass fertilized with nitrogen under intermittent stocking grazing with sheep
Provedor de dados: 96
Autores: Lopes,Marcos Neves; Cândido,Magno José Duarte; Pompeu,Roberto Cláudio Fernandes Franco; Silva,Rodrigo Gregório da; Carvalho,Thaíse Cristine Ferreira de; Sombra,Weberte Alan; Morais Neto,Luiz Barreto de; Peixoto,Márcio José Alves.
This study evaluated the biomass flow of massai grass in regrowth subjected to different nitrogen levels (control - no fertilization; 400; 800; and 1200 N kg ha-1year-1) and under rotational stocking with sheep, in a completely randomized design with repeated measures over time. The leaf elongation rate increased with increasing nitrogen levels (N) and the fourth grazing cycle presented a lower value compared with the others. The stem elongation rate responded linearly with increasing levels of N, but it was not influenced by grazing cycles. The senescence rate of leaves remaining before grazing and after grazing were not influenced by the nitrogen fertilization or amended with successive grazing cycles. The phyllochron was influenced only by the nitrogen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphogenesis; Nitrogen fertilization; Panicum maximum × Panicum infestum.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000100003

Morphogenetic traits and biomass accumulation of Brachiaria brizantha cv. Xaraés subjected to nitrogen doses
Provedor de dados: 96
Autores: Cabral,Welton Batista; Souza,Alexandre Lima de; Alexandrino,Emerson; Toral,Fábio Luiz Buranelo; Bonelli,Emerson Alencar; Lima,Leni Rodrigues de.
The objective of this experiment was to evaluate the morphogenetic traits and biomass accumulation of Brachiaria brizantha cv. Xaraés subjected to doses of N (0, 125, 250, 375 and 500 kg.ha-1 N). The treatments were arranged in a completely randomized design with four replications. Morphogenetic traits and biomass accumulation of dry matter (DM).ha-1 were evaluated. The results were subjected to statistical analysis by grouping the data in two periods, rainy season and throughout the year. Nitrogen doses influenced leaf appearance in the rainy season and throughout the year, with significant increase in leaf elongation during the rainy season, an increase of 56% compared with control. During this period, maximum dose of N (248.1 kg.ha-1) produced 214.49...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilization; Leaf appearance; Morphogenesis; Pastures.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000800002

The growth dynamics in Brachiaria species according to nitrogen dose and shade
Provedor de dados: 96
Autores: Paciullo,Domingos Sávio Campos; Fernandes,Priscila Beligoli; Gomide,Carlos Augusto de Miranda; Castro,Carlos Renato Tavares de; Sobrinho,Fausto de Souza; Carvalho,Carlos Augusto Brandão de.
It was studied the effects of shading (0, 36 and 54%) and of four nitrogen doses (0, 50, 100 and 150 mg N/dm³ of soil) on the morphogenetic traits and on the tillering of grasses of Brachiaria genus (B. decumbens, B. ruziziensis and B. brizantha cv. Marandu and cv. Xaraes), cultivated in pots with 5 kg substrate. It was used a complete random design, in a 3 × 4 × 4 factorial scheme with three replications. Nitrogen promoted increase in leaf appearance rate and in average leaf blade length, whereas shading increased stem elongation rate. Leaf elongation rate and tillering varied with the interaction among shading percentages and nitrogen doses. Shading increased response efficiency of leaf elongation rate to nitrogen doses, but reduced for tillering,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Brachiaria decumbens; Brachiaria ruziziensis; Morphogenesis; Silvopastoral system; Tillering.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000200006

Frequencies and intensities of defoliation in Aruana guineagrass swards: morphogenetic and structural characteristics
Provedor de dados: 96
Autores: Zanini,Guilherme Doneda; Santos,Gabriela Trevisan; Sbrissia,André Fischer.
The objective of this study was to evaluate the morphogenetic and structural characteristics of Aruana guineagrass pastures (Panicum maximum cv. Aruana) subjected to rotational stocking by sheep. The treatments corresponded to grazing when swards reached 95 or 98% of interception of incident light (LI) until post-grazing heights of 10 and 15cm and were allocated to experimental units (plots of 196 m²), according to a 2 × 2 factorial arrangement in a completely randomized design, with three replications, from January to May 2009. The morphogenetic assessments included: leaf appearance and elongation rates (LAR and LER), phyllochron (PHY) and leaf life span (LLS). Structural evaluations assessed the number of green leaves (NGL), dead leaves (NDL) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grazing management; Morphogenesis; Panicum maximum; Sward height.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000800007

Effect of water stress on the growth of Arachis pintoi plants under different nitrogen levels
Provedor de dados: 96
Autores: Sales,Rita Manuele Porto; Fries,Daniela Deitos; Bonomo,Paulo; Pires,Aureliano José Vieira; Campos,Cleide Nascimento; Brito,Paulo Henrique Rodrigues; Pereira,Iracema Souza; Santos,Joelma da Silva.
The objective was to evaluate the growth of Arachis pintoi fertilized with nitrogen and water deficiency conditions. The study was developed in a 4 × 4 factorial arrangement with four nitrogen levels (0, 40, 80 and 120 kg N/ha) and four irrigation levels (25, 50, 75 and 100% of field capacity), in a completely randomized experimental design, with four replications. High doses of N benefited the production of root shoots while the root increased its production at a dose of 40 kg N/ha. The number of green and senescent leaves were influenced by N fertilization and the water regime, where higher doses of N provided greater total number of green leaves (364 leaves/pot) and the limitation of water resulted in a greater number of senescent leaves (78...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Legume; Morphogenesis; Root; Water.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000300001

Characterization of tropical forage grass development pattern through the morphogenetic and structural characteristics
Provedor de dados: 96
Autores: Rodrigues,Carlindo Santos; Nascimento Júnior,Domicio do; Silva,Sila Carneiro da; Silveira,Márcia Cristina Teixeira da; Sousa,Braulio Maia de Lana; Detmann,Edenio.
An experiment was carried out with the objective to evaluate growth pattern of tropical forage grass under free growth by using morphogenetic and structural characteristics with the expectation of using this study for forage grass evaluation protocol. The experimental area was established with two cultivars of Panicum maximum Jacq. (Mombaca and Aruana), a hybrid cultivar of P. maximum Jacq. and P. Infestum BRA-7102 (Massai), two cultivars of Brachiaria brizantha (A. Rich.) Stapf (Marandu and Xaraes) and Molasses grass (Melinis minutiflora Beauv.) and jaragua grass (Hyparrhenia rufa (Nees) Stapf.). The grasses were planted in 1.0-m² experimental units with 24 plants arranged in a completely randomized block design with three replications. Growth pattern of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecophysiology; Grass evaluation; Morphogenesis; Multivariate analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000300009

Morphogenetic and structural characteristics of andropogon grass submitted to different cutting heights
Provedor de dados: 96
Autores: Sousa,Braulio Maia de Lana; Nascimento Júnior,Domicio do; Silva,Sila Carneiro da; Monteiro,Hélida Christhine de Freitas; Rodrigues,Carlindo Santos; Fonseca,Dilermando Miranda da; Silveira,Márcia Cristina Teixeira da; Sbrissia,André Fischer.
This work was performed aiming to evaluate the morphogenetic and structural characteristics of Andropogon gayanus cv. Planaltina species submitted to three cutting heights (20, 27 and 34 cm). The three cutting heights were allocated in experimental units (12 m²) in a complete randomized block design with three replications. The cuts were done when the light interception by the sward reached 95%. At this moment, the sward height revealed itself constant with values close to 50 cm. The lowest cutting height (20 cm) influenced negatively the final leaf blade length, the number of live leaves, the leaf lifespan, the stem elongation rate and the tiller population density, and it influenced positively the phyllochron and the leaf senescence rate. Probably, cuts...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Andropogon gayanus; Ecophysiology; Light interception; Morphogenesis; Sward height.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001000006

Morphogenetic and structural characteristics of xaraes palisadegrass submitted to cutting heights
Provedor de dados: 96
Autores: Sousa,Braulio Maia de Lana; Nascimento Júnior,Domicio do; Rodrigues,Carlindo Santos; Monteiro,Hélida Christhine de Freitas; Silva,Sila Carneiro da; Fonseca,Dilermando Miranda da; Sbrissia,André Fischer.
The objective of this work was to evaluate the morphogenetic and structural characteristics of xaraes palisadegrass submitted to three cutting heights (15, 20 and 25 cm) when the sward reached 95% of light interception during regrowth. The experiment was carried out according to a complete randomized block design with three replications. The sward surface height under the cutting condition of 95% of light interception was very homogeneous with values around 30 cm. The increase in cutting height reduced the leaf elongation rate and the number of live leaves but increased stem elongation rate. As the cutting criterion was the same, before the intense competition for light, the variation in the cutting severity had a small influence on the morphogenetic and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Ecophysiology; Grazing management; Light interception; Morphogenesis; Sward height.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000100008

Biomass flow in Tifton-85 bermudagrass canopy subjected to different management strategies under rotational grazing with dairy goats
Provedor de dados: 96
Autores: Cutrim Junior,José Antonio Alves; Cavalcante,Ana Clara Rodrigues; Cândido,Magno José Duarte; Silva,Gutenberg Lira; Oliveira,Luiza Elvira Vieira; Vasconcelos,Elayne Cristina Gadelha; Mesquita,Tony Maiko Oliveira.
Biomass flow characteristics and forage accumulation were evaluated in Bermudagrass (Tifton 85) pasture managed under intermittent stocking with different management strategies. The management levels utilized were conventional (10 cm residual height and unfertilized), light (20 cm residual height and unfertilized), moderate (20 cm residual height with fertilization of 300 kg N/ha.year) and intensive (10 cm residual height with fertilization of 600 kg N/ha.year). A randomized design was used with repeated measurements over time, in two periods of the year, with four replicates. There was significant effect of management × period of the year on the leaf elongation rate (LER). The management levels under fertilization (0.59 and 0.60 cm/tiller.day for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodon spp.; Dairy goat; Morphogenesis; Pasture management.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000200001

Structural characteristics of tiller age categories of continuously stocked marandu palisade grass swards fertilized with nitrogen
Provedor de dados: 96
Autores: Paiva,Adenilson José; Silva,Sila Carneiro da; Pereira,Lilian Elgalise Techio; Guarda,Vitor Del'Álamo; Pereira,Priscila de Mesquita; Caminha,Fábio Olegário.
The objective of this experiment was to evaluate the structural characteristics of young, mature and old tillers on continuously stocked marandu palisade grass maintained at 30 cm and fertilized with nitrogen. Treatments corresponded to three nitrogen application rates (150, 300 and 450 kg/ha of N) plus control (no fertilization) and were assigned to experimental units (1,200-m² paddocks) according to a completely randomized block design, with four replications. Measurements were performed during fall/winter 2007 and summer 2008. During summer, young tillers showed longer leaves and shorter stems relative to old tillers. During fall/winter, young and old tillers showed shorter leaves, while mature and old tillers showed longer stems. Tiller age interfered...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Demographic profile of tiller population; Morphogenesis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000100004

Plant regeneration from proroplasts of alfalfa (Medicago sativa) via somatic embryogenesis
Provedor de dados: 63
Autores: Monteiro,Mariza; Appezzato-da-Glória,Beatriz; Valarini,Maria José; Oliveira,Carlos Alberto de; Vieira,Maria Lucia Carneiro.
Alfalfa is one of the most frequently studied species from the production of tissue culture-derived embryos point of view. In this study, five alfalfa cultivars were analyzed with reference to their ability to regenerate plants from protoplast cultures via somatic embryogenesis. Plant regeneration from leaf-derived protoplasts isolated from the cultivar Rangelander was achieved using a protocol defined for alfalfa cell suspension-derived embryogenesis. Because of its high efficiency, this procedure is recommended for protoplast electroporation-mediated genetic transformation of alfalfa.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant biotechnology; In vitro culture; Morphogenesis; Forage legume.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400012

Phyllochron of Paspalum notatum FL. and Coelorhachis selloana (HACK.) camus in natural pasture
Provedor de dados: 63
Autores: Eggers,Lilian; Cadenazzi,Mónica; Boldrini,Ilsi Iob.
Leaf appearance rate and phyllochron are related variables which play a central role in forage production. Phyllochron is the time interval between the appearance of successive leaves and varies according to a number of environmental factors, among which temperature is the most important. The experiment was conducted in natural pasture with the aim of testing phyllochron variation under different seasons, herbage allowances, and topographic positions. Marked tillers were used to define the phyllochron, establishing a relationship between the number of leaves produced against thermal time during the sampling period. The time (expressed in °C) needed for the emergence of a leaf is equal to 1/b, where b is the slope coefficient of the regression. The lines...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphogenesis; Leaf appearance; Native grassland.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400001

In vitro morphogenesis and cell suspension culture establishment in Piper solmsianum C. DC. (Piperaceae)
Provedor de dados: 39
Autores: Balbuena,Tiago Santana; Santa-Catarina,Claudete; Silveira,Vanildo; Kato,Massuo Jorge; Floh,Eny Iochevet Segal.
Piper solmsianum is a shrub from Southeast Brazil in which many biologically active compounds were identified. The aim of this work was to establish a cell suspension culture system for this species. With this in mind, petiole and leaf explants obtained from in vitro plantlets were cultured in the presence of different plant growth regulator combinations (IAA, NAA, 2,4-D and BA). Root and indirect shoot adventitious formation, detected by histological analysis, was observed. Besides the different combinations of plant growth regulators, light regime and the supplement of activated charcoal (1.5 mg.l-1) were tested for callus induction and growth. Cultures maintained in light, on a 0.2 mg.l-1 2,4-D and 2 mg.l-1 BA supplemented medium, and in the absence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Callogenesis; Cell suspension culture; Morphogenesis; Pariparoba; Plant growth regulators.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000100029

eaf tissue flows in ryegrass managed under different stocking rates
Provedor de dados: 2
Autores: Silva, Mônique Foggiato da; Rocha, Marta Gomes da; Pötter, Luciana; Sichonany, Maria José de Oliveira; Ribeiro, Laila Arruda; Hundertmarck, Anelise Pereira.
Morphogenetic, structural variables and leaf biomass flows of Italian ryegrass (Lolium multiflorum Lam.) were evaluated under two stocking rates: ‘Low’ and ‘High’. These rates were determined by heifers exclusively on pasture or on pasture and supplemented with corn grain. The experimental design was completely randomized following a repeated measure arrangement, two stocking rates, two and four replications of area for the stocking rates ‘low’ and ‘high’, respectively. The morphogenetic variables, the number of green leaves and tiller density were similar in both stocking rates. Leaf senescence rate was higher with low stocking rate. Heifers grazed with similar intensity and frequency in both stocking rates. The increase by 33.6% in the stocking rate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.04.04.00-8 forage intake; Frequency of defoliation; Intensity of defoliation; Morphogenesis; Supplementation.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/24898

Biomass flows and defoliation patterns of alexandergrass pasture grazed by beef heifers, receiving or not protein salt
Provedor de dados: 2
Autores: Eloy, Lidiane Raquel; Universidade Federal de Santa Maria; Rocha, Marta Gomes da; Universidade Federal de Santa Maria; Pötter, Luciana; Universidade Federal de Santa Maria; Salvador, Paulo Roberto; Universidade Federal de Santa Maria; Stivanin, Sheila Cristina Bosco; Universidade Federal de Santa Maria; Hampel, Viviane da Silva; Universidade Federal de Santa Maria.
The experiment aimed at evaluating leaf biomass flow, intensity and frequency of defoliation of Alexandergrass (Urochloa plantaginea (Link) Hitch) by beef heifers exclusively on pasture or that grazed and received protein salt. A completely randomized experimental design was used with repeated measures over time, two treatments and two area replications, with three Angus test heifers by paddock. Leaf blade intake flow is 18% superior for heifers exclusively on pasture. Grazing intensity (59.8%) is similar when heifers receive protein salt or not. Heifers receiving protein salt reduce by one day the defoliation frequency of tillers. The supply of protein salt for beef heifers grazing Alexandergrass affects the herbivore-plant relationship, decreasing intake...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Defoliation frequency; Defoliation intensity; Morphogenesis; Urochloa plantaginea.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/21815

Morphological analysis of testes from post-hatch chicks submitted to temperature variation during incubation - doi: 10.4025/actascibiolsci.v33i2.8187
Provedor de dados: 3
Autores: Amaral, Rodrigo de Souza; Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília - UnB; Siqueira Filho, Emivaldo de; Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília - UnB; Coser, Leonardo Augusto Silva; Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília - UnB; Euzebio, Umberto; Departamento de Genética e Morfologia, Instituto de Ciências Biológicas, Universidade de Brasília - UnB.
This study aimed to evaluate the effects of temperature variation during incubation on testicular morphology of post-hatch chicks. We utilized 60 eggs incubated under different temperatures: Group 1 – 37.5°C; Group 2 – 39.5°C; and Group 3 – 34°C. Chicks were weighted and the testes were histologically analyzed. All eggs from Group 3 showed embryonic death. There were no significant differences in body weight and testicular morphology between Groups 1 and 2; however, there was a difference in the diameter of the seminiferous tubules (p &lt; 0.001). The increase in temperature to 39.5°C during incubation causes a decrease in diameter of the seminiferous tubules.
Tipo: Estudos morfológicos
Palavras-chave: 2.06.02.00-6 Gallus gallus domesticus; Thermal stress; Embryonic development; Seminiferous tubules; Morphogenesis Embriologia Gallus gallus domesticus; Thermal stress; Embryonic development; Seminiferous tubules; Morphogenesis.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/8187

Morphogenetic characteristics of three Brachiaria brizantha cultivars submitted to nitrogen fertilization
Provedor de dados: 42
Autores: Silva,Marcos F; Porto,Edson M. V; Alves,Dorismar D; Vitor,Cláudio M.T; Aspiazú,Ignacio.
This study aims to evaluate the morphogenetic characteristics of three cultivars of Brachiaria brizantha subjected to nitrogen fertilization. The design was a randomized block in factorial arrangement 4x3; three cultivars of B. brizantha - Marandu, Piatã, Xaraés and four nitrogen levels - 0, 80, 160 and 240 kg/ha, with three replications. The experimental units consisted of plastic pots filled with 5 dm3 of soil. Thereupon the establishment fertilization, varieties were sowed directly in the pots, leaving, after thinning, five plants per pot. Forty-five days after planting, it was done a standardization cut at 10 cm tall. Nitrogen levels were distributed according to the treatments, divided in three applications. The morphogenetic characteristics were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cv. Marandu; Cv. Piatã; Cv. Xaraés; Morphogenesis; Signal grass.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100371

In Vitro Organogenesis from Root Explants of Passiflora miniata Mast., an Amazonian Species with Ornamental Potential
Provedor de dados: 52
Autores: Carvalho,Paula Pinheiro de; Antoniazzi,Camila Aparecida; Faria,Rodrigo Brito de; Carvalho,Ilio Fealho de; Rocha,Diego Ismael; Silva,Maurecilne Lemes da.
ABSTRACT The present study reports a shoot organogenesis-based system for in vitro regeneration of Passiflora miniata, an Amazonia passion fruit species. Root segments were cultured in Murashige and Skoog (MS) medium supplemented with different concentrations (range 2-9 µM) of 6-benzyladenine (BA); thidiazuron (TDZ) or kinetin (KIN). Plant growth regulators were not added to the control treatment. Root explants have showed a high regenerative potential. After 30 days of in vitro culture, the root explants showed several shoots formed direct and indirectly. TDZ provided the best response in the differentiation adventitious shoots, mainly in the presence of 6.8 µM. The cytokinins BA and KIN responded producing a reduced number of shoots. After 120 days,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphogenesis; Ornamental passion fruit; Plant regeneration; Root explant; Shoot organogenesis; Thidiazuron.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100406

Histological analysis of the callogenesis and organogenesis from root segments of Curcuma zedoaria Roscoe
Provedor de dados: 52
Autores: Mello,Marcia O.; Melo,Murilo; Appezzato-da-Glória,Beatriz.
Callus was induced from root segments taken from in vitro grown plants of Curcuma zedoaria Roscoe. The explants were cultured on agar-solidified Murashige and Skoog medium supplemented with 13.4muM of alpha-naphthaleneacetic acid and 2.2muM of 6-benzylaminopurine at 25ºC in the dark. Histological analysis revealed that callus was formed from the hypertrophied cortical parenchyma cells of the explant. Some of these cells underwent division while the surrounding cells accumulated starch. Callus was capable of shoot bud regeneration after 70 days when it was transfered to liquid medium of the same composition. After 30 days in liquid medium, buds developed from nodular structures. The adventitious shoots developed extensive root systems when they were placed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adventitious bud; Anatomy; Morphogenesis; Zingiberaceae.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000200014

Selective agent and A. tumefaciens overgrowth-control antibiotics in Eucalyptus camaldulensis Cotiledonary culture
Provedor de dados: 52
Autores: Quisen,Regina; Oliveira,Yohana de; Pileggi,Marcos; Cuquel,Francine; Quoirin,Marguerite.
The objectives of the present work were to establish the minimal lethal dose of the selective agent to determine the type and concentration of appropriate antibiotics for the elimination of Agrobacterium tumefaciens inoculated explants, without interfering with the regenerative potential of the E. camaldulensis cotyledonary explants. Non-transformed explants were cultivated in medium supplemented with kanamycin. The results showed that the antibiotic was suitable for the selection of transformed cells in the concentration of 9 mg L-1 as it inhibited the growth of non-transformed cells. Cotyledons infected with A. tumefaciens were cultivated in MS N/2 medium supplemented with BAP, ANA, Km and cefotaxime or AugmentinÒ . The highest average of regenerated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphogenesis; Kanamycin; Cefotaxime; Augmentin; Agrobacterium tumefaciens; Eucalypt.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600020

Developmental effects of additional ultraviolet a radiation, growth regulators and tyrosine in Alternanthera brasiliana (L.) Kuntze cultured in vitro
Provedor de dados: 52
Autores: Silva,Nina Cláudia Barboza; Macedo,Andrea Furtado; Lage,Celso Luís Salgueiro; Esquibel,Maria Apparecida; Sato,Alice.
Tissue cultures of Alternanthera brasiliana (L.) Kuntze were treated with different growth regulators (Kinetin and 2,4-D), tyrosine and Ultraviolet A radiation (UV-A; 320 - 400 nm) to investigate their effects on development and pigment production. Nodal segments of plantlets grown from seeds were inoculated in all tested media and different light conditions. After eight weeks, this material was used to evaluate biomass, chlorophyll and betacyanin production. The Murashige and Skoog (MS) + kinetin medium resulted in development of approximately four shoots/explant. This medium plus white light was the best combination for micropropagation with the highest rooting percentage and betacyanin production. Plantlets grown under UV-A illumination reduced biomass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Betacyanin; Chlorophyll; Morphogenesis; Tissue Culture.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000600014

Effect of alcohols on filamentation, growth, viability and biofilm development in Candida albicans
Provedor de dados: 58
Autores: Chauhan,Nitin M; Shinde,Ravikumar B; Karuppayil,S. Mohan.
In this study we report the potential of alcohols as morphogenetic regulators in Candida albicans. All the alcohols tested influenced various modes of growth like planktonic as well as biofilm forms. Viability was affected at high concentrations. Among the alcohols, the response of C. albicans to amyl alcohol (pentanol) was noteworthy. Amyl alcohol at a concentration 0.5% which was not inhibitory to growth and viability specifically inhibited morphogenetic switching from yeast to hyphal forms. It also inhibited normal biofilm development favoring yeast dominated biofilms. Based on this study we hypothesize that alcohols produced under anaerobic conditions may not favor biofilm development and support dissemination of yeast cells. Since anaerobic conditions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alcohols; Signalling; Morphogenesis; Biofilms; Yeast metabolism; Candida albicans.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000400041

Exploring the Potential use of Photo-Selective Nets for Fruit Growth Regulation in Apple
Provedor de dados: 117
Autores: Bastías,Richard M; Manfrini,Luigi; Corelli Grappadelli,Luca.
The effect of shading (i.e. reduction of sunlight availability) on fruit growth physiology has been widely studied in apple (Malus domestica Borkh.), but little knowledge exist about fruit growth responses to changes in the light spectrum. The aim of the present research was to study the effect of use of colored nets with differential sunlight transmission in the blue (B, 400-500 nm), red (R, 600-700 nm) and far-red (FR, 700-800 nm) spectra on apple fruit growth and physiological associated responses. Three year old 'Fuji' apple trees were covered with 40% photo-selective blue and red shade nets, 40% neutral grey shade net, and 20% neutral white net as control. Red and blue net reduced in the same proportion (27%) the photosynthetically active radiation...
Tipo: Journal article
Palavras-chave: Sunlight spectrum management; Fruit size; Photosynthesis; Morphogenesis.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200010

Identification of tiller age categories based on morphogenetic responses of continuously stocked marandu palisade grass fertilised with nitrogen
Provedor de dados: 65
Autores: Paiva,Adenilson José; Pereira,Lilian Elgalise Techio; Silva,Sila Carneiro da; Dias,Raphael Antonio Prado.
Nitrogen fertilization augments tiller appearance and death, modifying the age profile of tiller population. Tillers from different age categories present distinct responses to environmental factors and management practices characterized by variation in their morphogenetic responses, which interfere in the dynamics of the herbage accumulation process. In that context, rates of leaf appearance and elongation and leaf lifespan were used as indicators to identify tiller age categories of continuously stocked marandu palisade grass managed at 30cm and subjected to nitrogen fertilization regimes using cluster analysis. Analysis was based on the average distance method using combined means of the response-variables studied, and the results used to build a...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Morphogenesis; Tiller age category; Population dynamics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000500867

Levels of defoliation and regrowth dynamics in elephant grass swards
Provedor de dados: 65
Autores: Rodolfo,Giselle Regina; Schmitt,Daniel; Dias,Kamila Maciel; Sbrissia,André Fischer.
The morphogenetic and structural characteristics of forage plants and the processes of growth and senescence in tissues may vary according to the grazing management strategies used. This research aimed to assess the process of regrowth in elephant grass swards Cv. 'Pioneiro' submitted to two pre-grazing heights (90 and 120cm) combined with two levels of defoliation (50 and 70%). A reduction of the leaf elongation rate (LER) was observed during the regrowth stages, in addition to a reduction in the rate of leaf appearance (LAR) and aerial tiller population density (ATPD). In contrast, an increase was observed in leaf senescence (LSR) and stem and pseudo stem elongation rates (SER). The severe defoliation (70%) combined with a pre-grazing height of 120cm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphogenesis; Regrowth stages; Pennisetum purpureum; Grazing management; Pioneiro-grass.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000701299

Plant morphology and herbage accumulation of signal grass with or without fertilization, under different light regimes
Provedor de dados: 65
Autores: Lopes,Clenardo Macedo; Paciullo,Domingos Sávio Campos; Araújo,Saulo Alberto do Carmo; Morenz,Mirton José Frota; Gomide,Carlos Augusto de Miranda; Maurício,Rogério Martins; Braz,Thiago Gomes dos Santos.
ABSTRACT: The silvopastoral system has been suggested as an alternative to recover degraded pastures in tropical regions. However, trees reduce the light available for pastures, which may affect the growth and herbage accumulation. The objective of this study was to evaluate the morphogenesis, canopy structure and herbage accumulation of signalgrass ( Brachiaria decumbens ) subjected to three light regimes (0, 20 and 70% of natural shading) and two fertilization levels (presence or absence of nitrogen, phosphorus and potassium). Leaf and stem elongation rates increased under shading but did not vary with fertilization. The leaf appearance rate was greater under fertilizer treatment but was generally similar among light regimes. The tiller density was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria decumbens; Morphogenesis; Shading; Silvopastoral system; Tiller density.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000200403