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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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