Navegando por Assunto "Cultivo in vitro"

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Acesso aberto (Open Access)
Efeito da escarificação e luminosidade na germinação in vitro de sementes de cagaiteira (Eugenia dysenterica DC.)
(2007-12) MARTINOTTO, Cristiano; PAIVA, Renato; SANTOS, Breno Régis; SOARES, Fernanda Pereira; HERRERA, Raírys Cravo; SILVA, Álvaro Augusto Naves
Cagaiteira is a native specie of brazilian cerrado with high yield. Because it seeds show high variability, it is yet considered recalcitrant and dormant, the germination in vitro appears as an alternative for specie propagation, in addition to obtain juvenile explant for micropropagation. The present research aimed to evaluate the effect of scarification and ligth on germination in vitro of cagaiteira seeds. Seeds without teguments and intact seeds were inoculated in MS medium and kept in abscence and presence of radiation. Seeds without tegument germinated in the presence or abscence of ligth showed 86.25% and 88.25% germination at 31 and 71 days of inoculation, respectively. After 150 days of inoculation, plantlets from seeds without tegument germinated in the presence and abscence of ligth, showed 10% and 12% of abnormalities, respectively.
Acesso aberto (Open Access)
Indução de calos em espécies amazônicas do gênero Theobroma
(2006-04) SILVA, Marivana Borges; RAMOS, Alessandra de Rezende; VENTURIERI, Giorgini Augusto
Many works have been done on cocoa (Theobroma cacao) in vitro culture, with few studies being published for other species of the same genus, as cupuassu (T. grandiflorum), whose planted area is increasing expressively, and others that could be used as a source of genes for those with recognized economical importance. Protocols to obtain in vitro somatic embryos from T. cacao,T. grandiflorum,T. speciosum and the hybrid T. grandiflorum x T. obovatum from two sources of explants, staminodes and petals (formed by ligues and cogules) were evaluated, using a primary callus growth medium made of DKW salts, supplemented with 20 g l-1 of sucrose, 250 mg l-1 of glutamine, 200 mg l-1 of myo-inositol, 0.2 mg l-1 of thyamine-HCl; 0.1 mg l-1 of nicotinic acid; 0.2 mg l-1 of glycine; 2 mg l-1 of 2,4-D; 2.2 g l-1 of Gelrite® and the pH adjusted to 5.8. To this media was added different concentrations of thidiazuron (0; 5 and 10 µg l-1). Cultures were maintained at dark for 14 days, at a temperature of 25 ± 2 ºC, and so transferred for the secondary callus growth, made with WPM salts, Gamborg vitamins, 20 g l-1 of sucrose, 2 mg l-1 of 2,4 D; 0.3 mg l-1 of cinetin, 50 ml l-1 of coconut milk, 2.2 g l-1 of Gelrite® and the pH adjusted to 5.8. Callus formation occurred in all species. Somatic embryos were obtained only for T. cacao. Callus formation was influenced by genotype and was higher on staminodes.
Acesso aberto (Open Access)
Produção e avaliação da atividade antioxidante de metabólitos secundários de Piper divaricatum G. Meyer sob diferentes condições de cultivo
(Universidade Federal do Pará, 2015-08-06) CORPES, Rosana Silva; SILVA, Joyce Kelly do Rosário da; http://lattes.cnpq.br/2278686174214080
Many species of the genus Piper are widely distributed in the Amazon and various biological applications because of large structural diversity of its secondary metabolites. The species Piper divaricatum, is endemic in the Amazon and produces in its essential oil high concentrations of methyleugenol (50-90%), an phenylpropanoid with antioxidant and fungicidal properties. Because of its potential applications, the objective of this study was to establish the in vitro cultivation and comparing the biosynthesis of secondary metabolites and antioxidant properties with the in vivo cultivation. For establish the in vitro culture were used shoot apexes on Murashige e Skoog medium with addition of regulator BAP 0.5 mg.mL-1. For in vivo cultivation, micropiles were propagated in the greenhouse in vermiculite and adding nutritious Murashige e Skoog solution. The volatile compounds identified in the leaves of seedlings grown in vivo were methyleugenol, β-elemene and E-β-ocimene, which did not differ from in vivo cultivation, with the exception of 90 days. The in vitro culture of roots was not efficient to produce phenylpropanoids and presented a very different profile compared to the in vivo cultivation of terpenes. In general, for plants in vitro cultivated there was no statistically significant difference in the phenolics compounds content and antioxidant activity in the leaves. However, the antioxidant activity of roots was significant. The results support the hypothesis that in vitro regenerated plants can synthesize metabolites similar the matrix plant and maintain their biological properties.