Consulta: creatorFacets:"Figueiredo-Ribeiro,Rita de Cássia L."
Registros recuperados: 9
Data/hora: 05/06/2024 10:51:06

Efeito do frio sobre os carboidratos solúveis em culturas embriogênicas de Acca sellowiana O. Berg (Myrtaceae)
Provedor de dados: 88
Autores: Mengarda,Liana H. G.; Pescardo,Rosete; Chu,Edison P.; Figueiredo-Ribeiro,Rita de Cássia L.
A rota da embriogênese somática de Acca sellowiana, uma espécie arbórea frutífera com limitações quanto à propagação vegetativa, já foi estabelecida mas o número de embriões que restabelecem o crescimento após a fase cotiledonar é baixo. No presente trabalho, embriões somáticos em diferentes fases de desenvolvimento foram obtidos após tratamentos com 2,4-D e submetidos à condição de frio (4 °C) durante 20 dias, visando induzir a transformação de embriões somáticos em plântulas. Observou-se que 95% dos embriões zigóticos desenvolveram embriões somáticos quando tratados com 2,4-D de forma contínua (T1), enquanto que apenas 55% foram formados quando a auxina foi usada na forma pulsada (T2). Porém, o tratamento T1 induziu altas taxas (82%) de deformações nos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acca sellowiana; Carboidratos solúveis; Embriogênese somática; Rafinose.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000200010

Diurnal variations of non-structural carbohydrates in vegetative tissues of Melinis minutiflora, Echinolaena inflexa and Lolium multiflorum (Poaceae)
Provedor de dados: 88
Autores: Souza,Amanda de; Sandrin,Carla Z.; Moraes,Moemy G.; Figueiredo-Ribeiro,Rita de Cássia L.
Echinolaena inflexa (Poir.) Chase is a native C3 grass species with high biomass production and abundance in the cerrado comparable to Melinis minutiflora Beauv., a C4 forage grass of African origin, widespread in the cerrado, displacing some native herbaceous species. These species accumulate mainly starch, differently of Lolium multiflorum Lam. ssp. italicum Beck cv. Lema (ryegrass), a C3 temperate forage grass that accumulates fructans as the major storage carbohydrate in the vegetative tissues. In the present study, we analyzed diurnal variations in the content and composition of non-structural carbohydrates (NSC) in the aerial vegetative parts of the three species. Results showed similarity in water-soluble carbohydrates (WSC) and starch contents...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Fructans; Panicoideae; Pooideae; Starch; Sugars.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000400010

Produção de frutanos em calos e plântulas clonadas in vitro de Viguiera discolor Baker (Asteraceae)
Provedor de dados: 39
Autores: Itaya,Nair Massumi; Vaz,Ana Paula Artimonte; Kerbauy,Gilberto B.; Figueiredo-Ribeiro,Rita de Cássia L.
Viguiera discolor Baker é uma espécie nativa do cerrado, cuja sobrevivência está ameaçada pela invasão de espécies exóticas. Considerando sua elevada produção e a vasta aplicação de frutanos, o presente trabalho foi conduzido visando à obtenção in vitro dessa espécie e à prospecção desses carboidratos nessas condições. Sementes foram germinadas in vitro, em meio MS modificado, e após cinco semanas de incubação, nós caulinares foram isolados e incubados no mesmo meio adicionado de 0,5 mg L-1 de ANA, regenerando plantas uniformes, raízesnão espessadas, raízes tuberosas e estruturas semelhantes a calo (calo tipo1), formadas na região caulinar basal. Análise desse material evidenciou a presença de frutanos do tipo inulina nas raízes tuberosas e nos calos tipo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Inulina; Carboidratos de reserva; Raízes tuberosas.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062005000300019

Anatomy and fructan distribution in vegetative organs of Dimerostemma vestitum (Asteraceae) from the campos rupestres
Provedor de dados: 42
Autores: Silva,Taiza M.; Vilhalva,Divina A.A.; Moraes,Moemy G.; Figueiredo-Ribeiro,Rita de Cássia L.
Among the compounds stored by plants, several functions are assigned to fructans, such as source of energy and protection against drought and extreme temperatures. In the present study we analyzed the anatomy and distribution of fructans in vegetative organs of Dimerostemma vestitum (Asteraceae), an endemic species from the Brazilian campos rupestres. D. vestitum has amphistomatic and pubescent leaves, with both glandular and non-glandular trichomes. In the basal aerial stem the medulla has two types of parenchyma, which differ from the apical portion. The xylopodium has mixed anatomical origin. Interestingly, although inulin-type fructans with high degree of polymerization were found in all analyzed organs except the leaves, the highest amount and maximum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Campo rupestre; Fructans; Inulin spherocrystals; Secretory structures; Xylopodium.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200797

Fructans and water suppression on intact and fragmented rhizophores of Vernonia herbacea
Provedor de dados: 52
Autores: Dias-Tagliacozzo,Gláucia M.; Itaya,Nair M.; Carvalho,M. Angela Machado de; Figueiredo-Ribeiro,Rita de Cássia L.; Dietrich,Sonia M. C.
In order to evaluate the involvement of fructans in drought tolerance, experiments were conducted using intact plants and excised rhizophores of Vernonia herbacea. The water content in rhizophores of intact plants was maintained for 30 days when plants were watered every 7 and 15 days, whereas plants remained alive up to 60 days without water. Total fructan, oligo- to polysaccharides ratio and mean molecular mass of polysaccharides increased in these plants indicating depolymerization of median size molecules. In apical fragments of rhizophores kept dry the oligosaccharides increased in relation to polysaccharides one day after excision in treated tissues. This was reflected in the HPLC profile of the oligosaccharides in which the proportion of free...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inulin; Environmental stresses; Drought; Fructan metabolism; Reserve organs; Asteraceae.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000300005

Woronin bodies in Penicillium janczewskii Zaleski
Provedor de dados: 58
Autores: Pessoni,Rosemeire A.B.; Freshour,Glenn; Figueiredo-Ribeiro,Rita de Cássia L.; Hahn,Michael G.; Braga,Márcia R.
Penicillium janczewskii Zaleski is an efficient microorganism for the production of extracellular inulinases and grows rapidly on medium containing sucrose or inulin as carbon source. Maintenance of this filamentous fungus on inulin medium induces secretion of large amounts of inulinases, but the resulting mycelium has thinner cell walls that easily collapse and break. Woronin bodies in hyphae of P. janczewskii grown on sucrose and inulin substrates were observed. No significant differences in the number, location, size and shape of Woronin bodies and level of plugging were observed in cultures of the fungus grown on the two carbon sources. The data indicate that the presence of Woronin bodies in P. janczewskii could not be associated with more easily...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Woronin bodies; Penicilliun; Inulin; Sucrose.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000200005

Variations in sugars and cyclitols during development and maturation of seeds of brazilwood (Caesalpinia echinata Lam., Leguminosae)
Provedor de dados: 61
Autores: Borges,Igor F.; Barbedo,Claudio J.; Richter,Andreas A.; Figueiredo-Ribeiro,Rita de Cássia L.
Seeds of Caesalpinia echinata are tolerant to desiccation, keeping their viability up to 0.08 g H2O g-1 DM. When stored under laboratory conditions they lose their viability within one month, while under low temperatures germination ability is maintained during two years of storage. Here, we report on the variations of soluble carbohydrates, cyclitols and cyclitol galactosides in seeds of C. echinata during development and maturation, aiming for a better understanding of the involvement of these compounds in the maturation process and seed quality. Individual flowers were tagged on the day of anthesis and pods were collected directly from the branches from 32 to 59 d after anthesis (DAA). Seeds were also collected after shedding. The physiological maturity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed development; Seed viability; Soluble carbohydrates.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000400005

Vegetative responses to temperature and photoperiod in saplings of brazilwood (Caesalpinia echinata Lam., Leguminosae)
Provedor de dados: 61
Autores: Rondon,Josimara N.; Zaidan,Lilian B.P.; Domingos,Marisa; Barbedo,Claudio J.; Figueiredo-Ribeiro,Rita de Cássia L.
Caesalpinia echinata Lam. (brazilwood) is an endangered tree species occurring along the eastern coast of Brazil from latitudes 5°56´S to 22°56´S. With such a range of distribution it is expected that temperature and daylength may affect plant development, which was examined in this study. One- and five-year-old saplings were grown under controlled photoperiods of 8 h, 12 h and 20 h, and in a greenhouse under natural light during 16 months. In another experiment, one-year-old saplings were cultivated for six months in a growth cabinet, with reduced maximum temperature, and in the greenhouse. Leaf number, stem height and stem diameter at the soil surface were evaluated every two months (experiment 1) or every month (experiment 2). In experiment 1, no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic forest; Endangered species; Tree growth.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000400004

Changes in pectins of the Xylopodium of Ocimum nudicaule from dormancy to sprouting
Provedor de dados: 61
Autores: Braga,Márcia Regina; Carpita,Nicholas C.; Dietrich,Sonia M. C.; Figueiredo-Ribeiro,Rita de Cássia L.
The thickened underground organ of Ocimum nudicaule is a tuber-like structure (xylopodium) that is dormant in winter and sprouts at the beginning of the spring. Changes in content of cell wall polysaccharides were shown to occur from dormancy to sprouting. Pectic polysaccharides of O. nudicaule were analyzed in relation to composition, molecular mass, and linkage structure in these two phenological phases. The pectin content was 33 % lower during sprouting when compared to dormancy. Changes were also observed in the molecular mass of the pectin fraction from dormancy to sprouting. Galacturonic acid was the predominant sugar, suggesting the presence of a homogalacturonan as the main pectic polysaccharide. A decrease in the acidic polysaccharides,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell-wall polysaccharides; Cerrado; Lamiaceae; Underground reserve organs; Xylopodium.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000200009