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Biochemical and morphological changes during the growth kinetics of Araucaria angustifolia suspension cultures BABT
Santos,André Luis Wendt dos; Silveira,Vanildo; Steiner,Neusa; Maraschin,Marcelo; Guerra,Miguel Pedro.
Embryogenic cultures of Araucaria angustifolia were established in a BM liquid medium supplemented with 2 µM 2,4-dichlorophenoxyacetic acid, 1 µM 6-benzylaminopurine and 1 µM kinetin (BM2) and in a BM medium free of growth regulators (BM0). During 42 days in culture, the cell growth pattern of both cultures was similar. The pH of the culture medium of both BM0 and BM2 underwent progressive reduction during culture time. For both the embryogenic cultures a preferential uptake of glucose in the late stages of cell growth kinetics was observed. The extracellular protein content was similar for both the embryogenic cultures. Acetocarmine and Evan's blue double stain showed major differences for early somatic embryo organisation, in which only the embryogenic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Araucariaceae; Glucose; PH changes; Protein; Somatic embryogenesis.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000300001
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Challenges in proteome analyses of tropical plants Braz. J. Plant Physiol.
Balbuena,Tiago S.; Dias,Leonardo L. C.; Martins,Mariana L. B.; Chiquieri,Tatiana B.; Santa-Catarina,Claudete; Floh,Eny I. S.; Silveira,Vanildo.
Genome sequencing of various organisms allow global analysis of gene expression, providing numerous clues on the biological function and involvement in the biological processes studied. Proteomics is a branch of molecular biology and biotechnology that has undergone considerable development in the post-genomic era. Despite the recent significant advancements in proteomics techniques, still there is much to be improved. Due to peculiarities to the plant kingdom, proteomics approaches require adaptations, so as to improve efficiency and accuracy of results in plants. Data generated by proteomics can substantially contribute to the understanding and monitoring of plant physiological events and development of biotechnological strategies. Especially for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2-DE; Mass spectrometry; Recalcitrant species; Proteomics; Unknown genome.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000200001
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In vitro morphogenesis and cell suspension culture establishment in Piper solmsianum C. DC. (Piperaceae) Acta Botanica
Balbuena,Tiago Santana; Santa-Catarina,Claudete; Silveira,Vanildo; Kato,Massuo Jorge; Floh,Eny Iochevet Segal.
Piper solmsianum is a shrub from Southeast Brazil in which many biologically active compounds were identified. The aim of this work was to establish a cell suspension culture system for this species. With this in mind, petiole and leaf explants obtained from in vitro plantlets were cultured in the presence of different plant growth regulator combinations (IAA, NAA, 2,4-D and BA). Root and indirect shoot adventitious formation, detected by histological analysis, was observed. Besides the different combinations of plant growth regulators, light regime and the supplement of activated charcoal (1.5 mg.l-1) were tested for callus induction and growth. Cultures maintained in light, on a 0.2 mg.l-1 2,4-D and 2 mg.l-1 BA supplemented medium, and in the absence of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Callogenesis; Cell suspension culture; Morphogenesis; Pariparoba; Plant growth regulators.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000100029
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Polyamine patterns in haploid and diploid tobacco tissues and in vitro cultures BABT
Carone,Sílvia Bicudo; Santa-Catarina,Claudete; Silveira,Vanildo; Floh,Eny Iochevet Segal.
The aim of this work was to determine PAs levels in pith tissues and callus cultures from haploid and diploid tobacco plants, explanted from the apical and basal regions of the stem. These explants were cultured in an RM-64 medium supplied with IAA and kinetin, under light or in the dark, during successive subcultures. PAs levels followed a basipetal decrease in diploid and an increase in haploid, pith tissues. A similar pattern of total PAs (free + conjugated) was observed for the callus of diploid and haploid plants maintained in the light, and for the haploid callus in the dark, whereas the diploid callus in the dark showed a constant increase in total PAs levels until the end of culture. The PA increase in the diploid callus in the dark was related to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biotechnology; Nicotiana tabacum; Ploidy; Putrescine; Spermidine; Spermine.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000200020
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Somatic Embryogenesis in Parana Pine (Araucaria angustifolia (Bert.) O. Kuntze) BABT
Santos,André Luis Wendt dos; Silveira,Vanildo; Steiner,Neusa; Vidor,Mário; Guerra,Miguel Pedro.
Embryogenic cultures of Araucaria angustifolia were induced from dominant and non-dominant zygotic embryos excised from immature seeds proceeding from three different genotypes and five harvest dates. Zygotic embryos were inoculated in inductive culture medium LP and BM supplemented with or without plant growth regulators 2,4-D (5 µM), BA (2 µM) and Kin (2 µM). The genotype of the mother tree and the developmental explant stage affected the induction frequency. In the maintenance phase, embryogenic cultures were maintained at continuous repetitive cell cycles every 20 days in semi-solid or liquid medium. In the maturation phase the culture medium was supplemented with different types and levels of growth regulators, osmotic agents, carbohydrates and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Araucaria angustifolia; Conifer; Somatic embryogenesis; Picea abies; Embryo maturation; Pinus sp..
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000100015
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Two-dimensional gel electrophoretic protein profile analysis during seed development of Ocotea catharinensis: a recalcitrant seed species Braz. J. Plant Physiol.
Dias,Leonardo L.C.; Balbuena,Tiago S.; Silveira,Vanildo; Santa-Catarina,Claudete; Schevchenko,Andrej; Floh,Eny I. S..
The aim of the present work was to characterize changes in the protein profile throughout seed development in O. catharinensis, a recalcitrant species, by two-dimensional gel electrophoresis. Protein extraction was undertaken by using a thiourea/urea buffer, followed by a precipitation step with 10% TCA. Comparative analysis during seed development showed that a large number of proteins were exclusively detected in each developmental stage. The cotyledonary stage, which represents the transition phase between embryogenesis and the beginning of metabolism related to maturation, presents the highest number of stage-specific spots. Protein identification, through MS/MS analysis, resulted in the identification of proteins mainly related to oxidative metabolism...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2-DE; Comparative proteomics; Embryo development; Storage protein; Lauraceae.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000100003
Registros recuperados: 6
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