Consulta: subjectFacets:"Stevia rebaudiana"
Registros recuperados: 7
Data/hora: 03/06/2024 03:45:53

Chromosomal and morphological studies of diploid and polyploid cytotypes of Stevia rebaudiana (Bertoni) Bertoni (Eupatorieae, Asteraceae)
Provedor de dados: Genetics and Molecular Biology
Autores: Oliveira,Vanessa M. de; Forni-Martins,Eliana R.; Magalhães,Pedro M.; Alves,Marcos N.
In this study, we examined the chromosome number and some morphological features of strains of Stevia rebaudiana. The chromosomes were analyzed during mitosis and diakinesis, and the tetrad normality and pollen viability were also assessed. In addition, stomata and pollen were measured and some plant features were studied morphometrically. All of the strains had 2n = 22, except for two, which had 2n = 33 and 2n = 44. Pairing at diakinesis was n = 11II for all of the diploid strains, whereas the triploid and tetraploid strains had n = 11III and n = 11IV, respectively. Triploid and tetraploid plants had a lower tetrad normality rate than the diploids. All of the strains had inviable pollen. Thus, the higher the ploidy number, the greater the size of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asteraceae; Pollen; Polyploidy; Stevia rebaudiana; Stevioside; Stomata.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200015

Deficiência de macronutrientes em estévia: sintomas visuais e efeitos no crescimento, composição química e produção de esteviosídeo
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Utumi,Marley Marico; Monnerat,Pedro Henrique; Pereira,Paulo Roberto Gomes; Fontes,Paulo Cézar Rezende; Godinho,Vicente de Paulo Campos.
Conduziu-se experimento objetivando descrever sintomas visuais de deficiências de macronutrientes em estévia (Stevia rebaudiana) e avaliar seus efeitos no crescimento, composição química e produção de esteviosídeo. Os sintomas foram: clorose generalizada, com -N; folhas verde-escuras, com -P; folhas com clorose, bronzeamento e necrose, com -K; necrose de ápices, com -Ca; clorose e necrose foliar, em "V" invertido, com -Mg e folhas verde-pálidas e menores, com -S. As deficiências de N, K e Mg reduziram o crescimento das folhas e a parte comercializável da planta, enquanto que a deficiência de Mg promoveu acentuada redução no desenvolvimento do sistema radicular. As deficiências de N, P, K e S diminuíram a relação entre matéria seca da parte aérea e das...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stevia rebaudiana; Nutrição mineral; Nitrogênio; Fósforo; Potássio; Cálcio; Magnésio; Enxofre.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000600016

Development and some histochemical aspects of foliar glandular trichomes of Stevia rebaudiana (Bert.) Bert. - Asteraceae
Provedor de dados: Revista Brasileira de Botânica
Autores: MONTEIRO,WALKYRIA ROSSI; CASTRO,MARÍLIA DE MORAES; MAZZONI-VIVEIROS,SOLANGE CRISTINA; MAHLBERG,PAUL GORDON.
The ten-celled biseriate glandular trichome of Stevia rebaudiana (Bert.) Bert.-Asteraceae, found on both leaf surfaces, originates from a single protruding, protodermal cell undergoing an anticlinal division. A subsequent series of periclinal divisions, occurring in acropetal sequence, leads to the formation of the trichome, composed of five pairs of cells, one pair of basal cells, another of stalk cells and three pairs of secretory head cells. Developing, still two-celled glandular trichomes already occur on leaf primordia of the second pair (these primordia measuring, in some cases, ca. 0.30 mm in length), and most of the glandular trichomes are at the mature phase on very young, expanding leaves, for example on those of the sixth pair. The secretory...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stevia rebaudiana; Asteraceae; Glandular trichomes; Ontogeny; Histochemistry.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000300013

Comportamiento del cultivo de Stevia rebaudiana (Bertoni) Bertoni en Cuba
Provedor de dados: Revista Cubana de Plantas Medicinales
Autores: Rodríguez González,Horacio; Acosta de la Luz,Lérida L; Hechevarría Sosa,Isabel; Rivera Amita,María Magdalena; Rodríguez Ferradá,Carlos Alberto; Sánchez Govín,Ester; Milanés Figueredo,Masgloiris.
Se presenta la recopilación de los resultados obtenidos en las investigaciones que sobre el cultivo de Stevia rebaudiana (Bertoni) Bertoni, se realizaron en la Estación Experimental de Plantas Medicinales de San Antonio de los Baños, provincia La Habana, Cuba. Bajo estas condiciones se pudo conocer mediante dos fechas de siembra: diciembre 2000 y enero 2001, que las semillas germinan a los 5 días de la siembra, aunque con bajo porcentaje y que se pueden trasplantar dos meses después. Se evaluaron tres cosechas en cada una de las fechas de siembra y se demostró que la de diciembre resultó la mejor pues casi se duplicaron los rendimientos. Como patógenos que la afectaron se observó el hongo Alternaria sp. y los insectos Agromyza sp., además de pequeñas...
Tipo: Journal article
Palavras-chave: Stevia rebaudiana; Cultivo; Comportamiento.
Ano: 2007
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S1028-47962007000400004

Yield, quality, and nutríent uptake of stevia under continental Mediterranean climate
Provedor de dados: Acta Agronómica
Autores: Prieto,Javier Matías; Cruz Sobrado,Verónica.
Abstract Stevia (Stevia rebaudiana Bertoni) is gaining attention due to its sweetening power. The stevia crop is still relatively unknown in Europe, and very little is known about its nutrient requirements. Therefore, agronomic studies are needed. Field trials were carried out in inland Spain in 2014 and 2015, in order to evaluate the yield, quality, and nutrient requirements of stevia according to planting density and harvest regime, under a continental Mediterranean climate. In 2014, the dynamics of growth, quality and accumulation of nutrients were studied during the vegetative period according to three planting densities (5.0, 7.5, and 10.0 plants m-2). No significant influence was found. The steviol glycosides concentration decreased sharply at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative crops; Fertilization; Stevia rebaudiana; Steviol glycosides; Sweetener.
Ano: 2021
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122021000400421

SINTESIS DE ESTEVIOSIDOS EN ESTEVIA (Stevia rebaudiana Bert.)
Provedor de dados: Acta Biológica Colombiana
Autores: Jarma Orozco,Alfredo; Espitia Camacho,Miguel; Fischer,Gerhard.
Stevia rebaudiana Bert. es una planta selvática subtropical nativa de Paraguay, que posee un potente edulcorante de hasta 300 veces más dulce que la sacarosa y no tiene calorías. Las moléculas responsables de esta característica son glucósidos de diterpeno, presentes en hojas y sintetizados, al menos en los estados iniciales, usando la misma ruta de síntesis del ácido giberélico, en la que el ácido shiquímico, da origen a muchos compuestos aromáticos. El acetato es el precursor de los terpenos o isoprenoides por la ruta del acetato-mevalonato, donde se encuentran los esteviósidos, aunque en este artículo se discute una ruta alternativa. La presente actualización pretende aportar algunas herramientas para el entendimiento de las principales rutas de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stevia rebaudiana; Edulcorante; Metabolismo secundario; Terpenoides.
Ano: 2010
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2010000100021

Replacing sugar with S. rebaudiana extracts on the physicochemical and sensory properties of strawberry ice cream
Provedor de dados: Ciência Rural
Autores: Aranda-Gonzalez,Irma; Perera-Pacheco,Maribel; Barbosa-Martín,Enrique; Betancur-Ancona,David.
ABSTRACT: Ice cream is a product whose formulation requires considerable amounts of sugar. In addition to providing flavor, sugar contributes to the physicochemical characteristics of ice cream but its consumption in large quantities is related to chronic diseases such as diabetes and obesity. For this reason, the food industry seeks to formulate products with sweeteners that preserve the physicochemical and sensory characteristics of the original product. Stevia rebaudiana is a plant that naturally contains glycosides with no calories and high sweetening capacity and it is considered safe for consumption. Therefore the aim of this research was to evaluate the effect of replacing sugar with different levels of extracts of S. rebaudiana Morita II and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stevia rebaudiana; Ice cream; Sweetener; Proximate analysis; Sensory evaluation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000400604