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Tipo do documento Info:eu-repo/semantics/article (12) Info:eu-repo/semantics/other (1) Ano 2020 (2) 2019 (1) 2010 (1) 2008 (2) 2007 (2) 2006 (2) 2003 (1) 2002 (1) 2001 (1) Mais... País Brazil (13) Idioma Inglês (9) Português (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 415 Primeira ... 4 5 6 7 8 9 10 11 12 ... Última Comparative effectiveness of two nitrogen sources for corn fertilization Phyton Copperi,MZ; Mandolesi,ME; Cantamutto,MA; Ron,MM. Corn has not only a high growth potential and a great capacity of biological response to suitable crop management but also may contribute to a better match of crops with environmental offer in Argentina. Nitrogen (N) fertilization must make provision for eventual N losses, and fertilization strategies must be designed so as to minimize their global incidence. The diferent quick-release N sources show similar efciencies when they are incorporated, but in surface applications, sources that contain little or no amidic N have a better performance than urea (U). The objective of this paper was to make an evaluation of corn response to N applied in V6 without incorporation, using two different solid N sources. A field experiment was carried out during 2004, in a... Tipo: Info:eu-repo/semantics/article Palavras-chave: Fertilizer technology; Nitrogen recovery; Substitution value. Ano: 2013 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572013000100014 Oxoaporphine alkaloids in Guatteria diospyroides Baill. and Annona squamosa L. (Annonaceae): (with 1 figure) Phyton Pérez-Amador,; González-Esquinca,A; Morales,MC; Toriz,F. A comparative study of the TLC profiles of Guatteria diospyroides Baill. and Annona squamosa L. were carried out from plants collected in the same locality of Chiapas, Mex. Four structures were analyzed, root, stem, leaf and seed. The profiles showed interspecific similarity and intraspecific differences. The root contains the highest concentration of the two major alkaloids and from this part they were extracted, analyzed and identified by spectroscopy as liriodenine and oxoanalobine. Tipo: Info:eu-repo/semantics/article Ano: 2004 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572004000100005 Polymer-based encapsulation of Bacillus subtilis and its effect on Meloidogyne incognita in tomato Phyton Pacheco-Aguirre,J; Ruiz-Sánchez,E; Reyes-Ramírez,A; Cristóbal-Alejo,J; Tun-Suárez,J; Borges-Gómez,L. Antagonistic bacteria used as biological control agent may loss effectiveness at the field due to environmental factors such as UV radiation, dryness and high temperature. An inexpensive alternative to protect antagonistic bacteria against such factors is the use of microencapsulating agents. In this work, the effect of microencapsulation of Bacillus subtilis with commercial gums on their antagonistic capacity against Meloidogyne incognita was evaluated. The eficiency of the microencapsulation was verified by the difference between the initial and final concentrations of protein release. The effectiveness as antagonist was evaluated against M. incognita in tomato under greenhouse conditions. The microcapsules based on carboxymethylcellulose (MBC) and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Rhizobacteria; Plant pathogenic nematode; Ionic gelation; Microencapsulation. Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100002 Influence of woody species on aerial growth of perennial grasses in semi-arid rangelands of central Argentina Phyton Blazquez,FR; Peláez,DV; Andrioli,RJ; Elia,OR. The interaction between woody and grass species in semi-arid rangelands of central Argentina was assessed through the evaluation of the impact of woody species on grass growth over a 2-y period. The study comprised two morpho-physiologically different woody species and two cool-season perennial grass species highly preferred by domestic livestock. The study involved the assessment of total green length (TGL) and number of green leaves (NGL) per tiller in grasses growing beneath the canopy of woody species and in open rangeland areas. Soil temperature, pH and water, nitrogen, phosphorus and organic matter content were estimated at the same study sites. Precipitation during the study period was also recorded. Woody species induced higher TGL of grasses... Tipo: Info:eu-repo/semantics/article Palavras-chave: Canopy architecture; Soil temperature; Soil water content; Tiller green length. Ano: 2014 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000200023 Analysis of volatile compounds in three unifloral native Chilean honeys Phyton Montenegro,G; Gómez,M; Casaubon,G; Belancic,A; Mujica,AM; Peña,RC. Three unifloral honeys were identified by the pronounced presence of specific compounds by means of sensorial analysis and SPME-GC-MS. Smoky and resinous (‘propolis') odors characterized unifloral "quillay" (Quillaja saponaria) honey. "Corontillo" (Escallonia pulverulenta) honey was characterized by caramel and vanillin aromas, and "ulmo" (Eucryphia cordifolia) honey by having an anise scent with a floral jasmine note. Safranal was a useful marker for "corontillo" honey. Isophorone and cetoisophorone were the distinctive compounds of unifloral "ulmo" honey. In "quillay" honeys, megastigmatrienone, 2-p-hydroxyphenylalcohol and minor quantities of β-pinene and linalool oxide were correlated with their sensory properties such as resinous. Tipo: Info:eu-repo/semantics/article Palavras-chave: Ulmo honey; Escallonia or "corontillo" honey; Quillaja honey; SPME-GC-MS analysis. Ano: 2009 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572009000100011 Cylindrocladium spathiphylli, a causal agent of root and crown rot of Spathiphyllum wallisii in Buenos Aires, Argentina Phyton Grijalba,PE; Palmucci,HE. A new disease of Spathiphyllum wallisii plants, characterized by leaf yellowing and wilting due to root and crown rot, was observed in nurseries of the Great Buenos Aires, Argentina. A fungus was consistently isolated from diseased tissue and identified as Cylindrocladium spathiphylli, on the base of its morphological and cultural characteristics. Inoculation tests were carried out which confirmed this fungus as the causal agent of the disease. This is the first report of C. spathiphylli causing root and crown rot of S. wallisii in Buenos Aires. Tipo: Info:eu-repo/semantics/article Palavras-chave: Spathiphyllum wallisii; Cylindrocladium spathiphylli; Root and crown rot. Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100007 Efectos de la cosecha de la corteza en la biología de una población de Elaeodendron transvaalense Jacq. Phyton Tshisikhawe,MP; Van Rooyen,MW. Elaeodendron transvaalense Jacq. es una de las especies vegetales medicinales comúnmente utilizada por los habitantes en la región de Venda. La especie permite tratar una variedad de enfermedades. Es ampliamente usada e importante para los curanderos tradicionales. Debido a esto, llegó a los mercados muthi, y está entre las siete especies de plantas más comercializadas en la región de Venda. Este estudio investigó el impacto de la cosecha de la corteza en la estructura de la población de esta especie. El estudio mostró que aunque el nivel de cosecha es alto, la especie es capaz de resistir el estrés desde que es una especie de grano fino. La población también mostró la capacidad de regenerarse desde que exhibió una curva de J inversa. El estado de salud de... Tipo: Info:eu-repo/semantics/article Palavras-chave: Cosecha de corteza; Modelado de matrices; Plantas medicinales; Mercados muthi; Tasa de crecimiento de la población. Ano: 2013 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572013000200020 In vitro conservation of apical meristem-tip of Melia azedarach L. (Meliaceae) under slow-growth conditions: (with 1 table & 2 figures) Phyton Scocchi,AM; Mroginski,LA. Studies on in vitro storage of Melia azedarach -"paradise tree"- under slow-growth conditions were carried out to develop an efficient protocol for the conservation of the genetic diversity of the crop. The response to different growth retardation treatments was examined using clone E. In vitro cultures of apical meristem-tips (0.2-0.3 mm in length) could be effectively maintained for 12 months at 4ºC on ¼ MS basal medium supplemented with 0.5 µM BA. Shoot proliferation was observed on 67 % of the recovered apical meristem-tips, after 12 months at 4ºC. Rooting of the regenerated shoots was achieved by reculturing them on MS + 17.5 µM IBA, during 4 days and subsequently transferred to MS medium lacking growth-regulators for 30 days. Complete plants were... Tipo: Info:eu-repo/semantics/article Palavras-chave: Conservation; Germplasm; In vitro culture; Melia azedarach; Meristem. Ano: 2004 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572004000100017 Efecto de la densidad y estructura del dosel de maíz en la penetración de la radiación solar Phyton Montemayor Trejo,José Alfredo; Zermeño González,Alejandro; Olague Ramirez,Jesús; Aldaco Nuncio,Rogelio; Fortis Hernández,Manuel; Salazar Sosa,Enrique; Rodríguez Rios,José Cruz; Vázquez-Vázquez,Cirilo. El objetivo de esta investigación fue analizar el efecto de la densidad de población y la estructura del follaje del maíz en la penetración de la radiación solar fotosintéticamente activa y su relación con algunas características del rendimiento. El trabajo se desarrolló durante el ciclo Primavera-Verano del 2000 en el Rancho "Cerro del Agua" ubicado en el kilómetro 154 de la carretera Saltillo - Matehuala. Se estableció el híbrido de maíz Prime Time en un arreglo factorial de tres por dos, bajo un diseño de bloques completos al azar con arreglo en franjas y tres repeticiones. Como factor "a" se usaron tres densidades de población (5.5, 7.4 y 11.1 plantas m-2) y como factor "b" se utilizaron diferentes inclinaciones del follaje mediante la colocación de... Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mayz L.; Dosel; Estructura; Coeficiente de extinción. Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572006000100005 Growth of clonal modules on Agropyron michnoi in the Songnen Plain of Northeast China Phyton Zhang,J; Zhou,C; Yang,YF. Spatial expansion of clonal plants and growth of their modules are of concern in the field of plant ecology. After measuring a large number of samples, we analyzed the module components and the growth patterns of vegetatively propagated Agropyron michnoi clones in the Songnen Plain on Northeast China. The results showed that the plasticity of clonal growth was large; the coefficients of variation of both extensive areas and the quantitative characters of modules were more than 20%. The numbers of ramets, seedlings, and buds and the cumulative length of the rhizomes showed exponentially and linearly increasing patterns with increases of the area and the total number of modules. The biomass of each module, total number of modules and total biomass showed an... Tipo: Info:eu-repo/semantics/article Palavras-chave: Agropyron michnoi; Clonal growth; Vegetative propagation; Number of modules; Biomass. Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000200021 Cloning and expression analysis of rubredoxin from cold-treated banana leaves Phyton Feng¹,RJ; Lu,LF; Yuan,KH; Cheng,P; Zhang,LL; Qi,JF; Ren,Y; Xu,XL; Zhang,XB; Zhou,LY; Zhang,YD. A banana (Musa AAA, Cavendish subgroup cv. Brazil) cDNA encoding a putative rubredoxin-like protein (MaRd1) was obtained from total RNA isolated from cold-treated banana leaves using rapid amplification of cDNA ends (RACE) technique. MaRd1 cDNA contained 597 nucleotides encoding 198 amino acids in the open reading frame. MaRd1 protein showed 56% amino acid identity with that of Pyrococcus furiosus rubredoxin (P24297). A chloroplast transit peptide and a transmembrane region were detected at the N-terminus and the C-terminus, respectively, of the deduced amino acid sequence of MaRd1 gene. Southern blotting revealed the occurrence of at least two copies of MaRd1 in the banana genome. Real time quantitative RT-PCR analysis revealed that the expression of... Tipo: Info:eu-repo/semantics/article Palavras-chave: Rubredoxin; Expression; Banana; Stress response. Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000200008 Contribución al conocimiento de la anatomía foliar de Mnesithea selloana (Hack.) de Koning & Sosef (Andropogoneae-Panicoideae-Poaceae) Phyton Moya,ME; Galussi,AA; Gómez,MJ; Marchese,FG. El objetivo del presente trabajo fue analizar la anatomía foliar en sección transversal de lámina y en vista superficial de epidermis de Mnesithea selloana. Se realizaron transcortes y preparados epidérmicos de la parte media de hojas de innovaciones estériles los cuales se acondicionaron, se observaron con microscopio óptico (MO) y microscopio electrónico de barrido (MEB). Las características histofoliares observadas fueron: células epidérmicas, intercostales, subsidiarias, suberosas, silíceas y buliformes; además estomas, pelos, ceras, mesofilo, vaina Kranz, haces vasculares, esclerénquima, parénquima incoloro y margen de la hoja. Las observaciones realizadas a nivel epidérmico manifestaron que M. selloana presenta una epidermis de tipo panicoideo... Tipo: Info:eu-repo/semantics/article Palavras-chave: Mnesithea selloana; Hoja; Anatomía foliar; Epidermis adaxial y abaxial. Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100024 Physiological and biochemical changes during organogenesis and somatic embryogenesis of HBsAg-transgenic cherry tomato mutant Phyton Guan,Z-J; Lu,S-B; Huo,Y-L; Guo,B; Guan,Z-P; Wei,Y-H. Leaf explants of the HBsAg-transgenic cherry tomato (Solanum lycopersicum) mutant were cultured on Murashige and Skoog (MS) basal medium, supplemented with 1.0 mg/L 6-BA and 0.05 mg/L IAA for callus induction, to clarify the physiological and biochemical characteristics of morphogenesis development. Therefore, the physiological and biochemical changes during the development of organogenic shoots and somatic embryos in the mutant were studied. Superoxide dismutase (SOD) activities of the mutant had only one peak value on the 21st day. Peroxidase (POD) activities of the mutant declined less sharply since the explants were cultured. IAA oxidase activity of the mutant increased steadily until 42 days from culturing and then decreased sharply. Malondialdehyde... Tipo: Info:eu-repo/semantics/article Palavras-chave: Physiological; Biochemical; Organogenesis; Somatic embryogenesis; HBsAg-transgenic; Cherry tomato; Mutant. Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000200013 Variaciones anatómicas en la raíz de Pappophorum philippianum inducidas por salinidad: (con 2 figuras y 2 cuadros) Phyton Ramos,Julio C; Perreta,Mariel G; Tivano,Juan C; Vegetti,Abelardo C. Este trabajo analiza el efecto de la salinidad sobre la proporción y la conformación de los tejidos radicales de Pappophorum philippianum Parodi. Se estudiaron dos niveles de salinidad: conductividad eléctrica de la solución de riego 1 mS/cm (Ct ) y 18 mS/cm (C18). Para el estudio anatómico, se extrajeron secciones de raíces nodales tomadas a 10 mm del ápice y se confeccionaron preparados histológicos permanentes. A partir de éstos se digitalizaron imágenes y se determinó para cada tratamiento el porcentaje de la superficie de cada tejido, el espesor de la pared de la exodermis, el porcentaje en superficie de la pared celular de la exodermis y la distribución de frecuencias de los diámetros de los vasos del xilema. La salinidad no afectó la proporción del... Tipo: Info:eu-repo/semantics/article Palavras-chave: Salinidad; Raíz; Xilema; Pared celular. Ano: 2004 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572004000100011 Sistema de producción y cadena de valor del cultivo de Orégano (Origanum sp.) en la Provincia de Córdoba (Argentina) Phyton Argüello,JA; Núñez,SB; Davidenco,V; Suárez,DA; Seisdedos,L; Baigorria,MC; La Porta,N; Ruiz,G; Yossen,V. El objetivo de esta revisión fue realizar un análisis e identificación de la problemática del Sistema de Producción y de la Cadena de Valor del Orégano en la zona del Valle de Traslasierra de la Provincia de Córdoba. En la región, se cultivan ecotipos tradicionales como Criollo, Chileno II y Compacto, y nuevos como el "Serrano Cordobés", "Flor Rosa" y "Rosa Fuerte". El Valle Traslasierra de la Provincia de Córdoba es agroecológicamente muy apto para la producción, y para incrementar la producción del cultivo de orégano se debe optimizar el manejo agronómico de los distintos ecotipos. Los estudios ecofisiológicos realizados hasta el momento en la región sugieren que los ecotipos de arquitectura erecta (Criollo) se comportan como un idiotipo más productivo... Tipo: Info:eu-repo/semantics/article Palavras-chave: Ecofisiología; Plagas y enfermedades de aromáticas; Cadena Agroalimentaria. Ano: 2012 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000100004 Evaluación in vitro de la actividad antifúngica de cuatro extractos vegetales metanólicos para el control de tres especies de Fusarium spp. Phyton Ochoa Fuentes,YM; Cerna Chávez,E; Landeros Flores,J; Hernández Camacho,S; Delgado Ortiz,JC. El objetivo de la investigación fue evaluar la actividad antifúngica in vitro de los extractos de pirul (Shinus molle), chirimoya (Annona cherimola), canela (Cinnamomum zeylanicum) y tabaquillo (Nicotiana glauca) sobre el crecimiento micelial y esporulación de Fusarium oxysporum, Fusarium culmorum y Fusarium solani. El trabajo de investigación se realizó en la Universidad Autónoma de Aguascalientes (UAA), y en la Universidad Autónoma Agraria Antonio Narro (UAAAN). Las cepas de Fusarium fueron previamente identificadas en el Laboratorio de Parasitología de la UAA. Los extractos fueron obtenidos en el Laboratorio de Toxicología de la UAAAN. Para determinar la inhibición del crecimiento micelial, dosis efectiva media (ED50) y número de conidios, se utilizó la... Tipo: Info:eu-repo/semantics/article Palavras-chave: Fusarium oxysporum; Fusarium culmurorum; Fusarium solani; México. Ano: 2012 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000100010 Bacterial diversity in the rhizosphere of a transgenic versus a conventional maize (Zea mays) Phyton Vital-López,L; Cruz-Hernández,MA; Fernández-Dávila,S; Mendoza-Herrera,A. Genetically modified crops could cause negative effects on bacterial communities. In this study, we compared the bacterial community structure of two maize cultivars to determine whether the transgenic cultivar exerts a negative effect on bacterial communities inhabiting the rhizosphere. Cultivars included the genetically modified maize (Zea mays), with the pat-gene conferring resistance to the herbicide glufosinate (synonym: L-phosphinothricin), and the hybrid, conventional maize. Metagenomic DNA was extracted from the rhizosphere of plants grown in a greenhouse. Single-strand conformation polymorphism, based on polymerase chain reaction amplifying a partial subunit rRNA gene was used to characterize and generate genetic profiles that corresponded to the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Glufosinate; Metagenomic DNA; Rhizosphere; Single-strand conformation polymorphism. Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000200006 The effects of tin (Sn) additions on the growth of spinach plants Phyton Müller,FL; Cyster,LF; Raitt,LM; Aalbers,J. An increase in bioavailable tin in the environment could result in bioaccumulation thereof in agricultural crops, and therefore, have adverse health consequences on humans that eat these crops. The aims of the current study were thus to assess the uptake of Sn by spinach plants, and the subsequent efects this will have on the uptake of Na, Zn, K, Ca, and Mg as well as the growth of spinach plants. Spinach plants were grown in sand culture and received tin at concentrations of 0.02, 0.2, 2 and 20 mg/L along with a nutrient solution. The uptake of tin at detectible concentrations only occurred at the highest concentrations (2 and 20 mg/L), and it was mostly retained in the roots of the plants. Tin additions also resulted in no visual toxicity symptoms, and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Beneficial; Heavy metals; Root allocation; Stannous chloride. Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000200027 Anatomía de flor y fruto de Vassobia breviflora (Solanaceae) en el sur de las Yungas australes (Argentina) Phyton Bernacki,FG; Albornoz,PL; Valoy,M; Ordano,M. Solanaceae es una familia con aproximadamente 2400 especies de distribución cosmopolita. Vassobia breviflora es la única especie del género presente en Argentina. El objetivo de este trabajo fue revisar y caracterizar la anatomía de la flor y fruto de V. breviflora a partir de muestras recolectadas en poblaciones de las Yungas del noroeste argentino. Se aplicaron técnicas anatómicas convencionales. Los resultados mostraron que la mayoría de las estructuras de la flor, el fruto y la semilla no difirieron de lo previamente reportado respecto de la organización estructural descripta para otras especies de Solanaceae. No obstante, por primera vez, describimos el androceo, el fruto, la semilla, pedicelo floral y frutal, cinco tipos de tricomas y cinco tipos de... Tipo: Info:eu-repo/semantics/article Palavras-chave: Anatomía; Solanaceae; Flor; Fruto; Semilla. Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000200030 Hyperhydricity control of in vitro shoots of Turbinicarpus valdezianus (Möller) GL & F Phyton García Osuna,HT; Benavides Mendoza,A; Escobedo Bocardo,L; Villarreal Quintanilla,JA; Cornejo Oviedo,E. Turbinicarpus valdezianus is a species under special protection, according to the current law NOM-059-ECOL-2010. It spreads preferably through shoot proliferation in vitro. A common problem associated with the propagation of this species by tissue culture is the hyperhydricity or excess of water accumulation in the tissues of shoots explants. The literature on this topic indicates that such response is related with oxidative stress. Because of this, the effects of inhibitors of the gibberellins [paclobutrazol (PBZ) and calcium prohexadione (PCa)] and salicylic (SA) and benzoic acids (BA) were tested to diminish the hiperhydrycity of the sprouts, which was measured after twelve weeks of study initiation. The treatment with PBZ (3.4 x... Tipo: Info:eu-repo/semantics/article Palavras-chave: Turbinicarpus valdezianus; Hyperhydricity; Paclobutrazol; Calcium prohexadione; Salicylic acid; Benzoic acid. Ano: 2011 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572011000200009 Registros recuperados: 415 Primeira ... 4 5 6 7 8 9 10 11 12 ... Última

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