Consulta: creatorFacets:"Randi,Áurea Maria"
Registros recuperados: 4
Data/hora: 01/06/2024 16:48:25

Effects of sucrose and irradiance on germination and early gametophyte growth of the endangered tree fern Dicksonia sellowiana Hook (Dicksoniaceae)
Provedor de dados: Acta Botanica Brasilica
Autores: Renner,Gladys Daniela Rogge; Randi,Áurea Maria.
It is an endangered tree fern that grows in mixed umbrophylus forests in the tropics. Sterilized spores were germinated at 25 ± 2ºC under a 16-hour photoperiod, in Dyer and MS medium supplemented with 0 to 5% sucrose. The germination was lower with the addition of sucrose. Dry mass was higher in 30-day-old gametophytes cultivated in Dyer medium with the addition of 3 to 5% of sucrose. The dry mass decreased in 30-day-old gametophytes cultivated in Dyer and MS media without sucrose and in MS medium with the addition of 4 or 5% of sucrose. The effect of different irradiance on the germination and early gametophyte development of D. sellowiana was analyzed in the autumn of 1998 (May until July). Conical flasks containing spores were kept over a period of 49...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugar; Chlorophyll; Gametophyte; Germination; Irradiance.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062004000200017

Influência da coloração das sementes na germinação de Phyllanthus tenellus Roxb. e Phyllanthus niruri L. (Euphorbiaceae)
Provedor de dados: Acta Botanica Brasilica
Autores: Venturi,Silvia; Randi,Áurea Maria.
Heteromorfia foi observada em sementes de Phyllanthus tenellus Roxb. e P. niruri L. Há dois tipos de sementes: marrons e amarelas. As quantidades desses tipos de sementes variaram ao longo do ano nas coletas realizadas. As sementes marrons apresentam maior massa e porcentagem de germinação mais alta. Proteínas e açúcares solúveis totais foram analisados em sementes de P. niruri sendo que teores mais elevados dessas substâncias de reserva foram verificados em sementes coletadas no final da primavera, enquanto teores menores foram encontrados em sementes coletadas no outono, embora não tenha sido verificada alteração na massa dessas sementes cuja germinação foi menor do que na coleta de primavera. Os teores de açúcares solúveis totais foram maiores em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phyllanthus tenellus; Phyllanthus niruri; Heteromorfia; Germinação.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061997000100009

Spore germination of Gleichenella pectinata (Willd.) Ching (Polypodiopsida-Gleicheniaceae) at different temperatures, levels of light and pH
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Santos,Eunice Pereira Gonçalves dos; Lehmann,Débora Rosana Marques; Santos,Marisa; Randi,Áurea Maria.
This study investigated the effects of different temperatures (25 and 30 ± 2 ºC), light levels (62, 42, 22 and 5% of natural light), and pH (4.0, 4.5, 5.0, 5.5, 6.0 and 6.7) on the spore germination of Gleichenella pectinata. To accomplish this, the spores were surface sterilized and sown in bottles containing mineral medium. The spores of G. pectinata are monolets and the perispore surface can show large and irregular deposits. During germination, filamentous gametophytes with and without developing rhizoids were observed. Only gametophytes which presented developed rhizoids were able to reach the heart-shaped developmental stage. Based on the collection, the rate of and gametophyte development were generally very low. The relative germination rates were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gleichenella pectinata; Germination; Light; PH; Temperatures.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000600007

Variability in the germination of spores among and within natural populations of the endangered tree fern Dicksonia sellowiana Hook. (Xaxim)
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Gomes,Gabriela Schmitz; Randi,Áurea Maria; Puchalski,Ângelo; Santos,Daisy da Silva; Reis,Maurício Sedrez dos.
The objective of this study was to analyze the existing variability in the germination of individuals' spores collected from two natural populations of Dicksonia sellowiana in southern Brazil. The largest intrapopulational variation was observed for the spores germination. These results suggested the existence of adaptative strategies that favored the gradual and continuous entrance of new individuals into the gametophytic population. The behavior of the individuals of the species within each population followed a similar pattern of initial development, in spite of conspicuous differences in the population structure. This showed a low differentiation between the populations and the existence of adaptative strategies which were common to both communities.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arborescent fern; Dicksonia sellowiana; Spore germination; Intraspecific variability; Adaptative strategies.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000100001