Xylogenesis
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Sequencing, identification and analysis of juvenile Eucalyptus grandis xylem proteins / Sequenciamento, identificação e análise de proteínas do caule de mudas de Eucalyptus grandis
The process of wood formation is an important economical factor for the forestry industry and it is also of ecological importance, although little is known about the proteins involved in wood formation. The sequencing, identification and analysis of proteins provides such information of wood formation. Using proteomics techniques such as two-dimensional gel
Publicado em: 2006
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2. Xylem and nonxylem cell formation in cytokinin-stimulated root tissue: Quantitative analysis of temperature effects
Xylogenesis in mature root parenchyma is elicited in vitro by the concerted action of the hormones cytokinin and auxin. Decreasing the temperature delayed the initiation of xylogenesis relative to the initiation of nonxylem cell formation. Once xylem or nonxylem cell formation was initiated, its rate was not temperature-sensitive within the 10-25°C range. L
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3. Gibberellin-Mediated Synergism of Xylogenesis in Lettuce Pith Cultures
Major gibberellins (GAs) in lettuce (Lactuca sativa L. cv Romaine) pith explants have been identified by gas chromatography-mass spectrometry (GC-MS) or GC-selected ion monitoring (GC-SIM) as GA1, 3-epi-GA1, GA8, GA19, and GA20. Treatment of pith explants with indole-3-acetic acid (IAA) (57 micromolar) plus kinetic (0.5 micromolar) induced xylogenesis. In th
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4. A transcriptional roadmap to wood formation
The large vascular meristem of poplar trees with its highly organized secondary xylem enables the boundaries between different developmental zones to be easily distinguished. This property of wood-forming tissues allowed us to determine a unique tissue-specific transcript profile for a well defined developmental gradient. RNA was prepared from different
The National Academy of Sciences.
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5. Wood contains a cell-wall structural protein.
A pine extensin-like protein (PELP) has been localized in metabolically active cells of differentiating xylem and in mature wood of loblolly pine (Pinus taeda L.). This proline-rich glycosylated protein was purified from cell walls of differentiating xylem by differential solubility and gel electrophoresis. Polyclonal rabbit antibodies were raised against th
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6. Cinnamyl-alcohol dehydrogenase, a molecular marker specific for lignin synthesis: cDNA cloning and mRNA induction by fungal elicitor.
Cinnamyl-alcohol dehydrogenase (CAD; EC 1.1.1.195) catalyzes the final step in a branch of phenylpropanoid synthesis specific for production of lignin monomers. We have isolated a full-length cDNA clone encoding CAD, as a molecular marker specific for lignification, by immunoscreening a lambda gt11 library containing cDNAs complementary to mRNA from elicitor
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7. Identification of BFN1, a Bifunctional Nuclease Induced during Leaf and Stem Senescence in Arabidopsis1
Nuclease I enzymes are responsible for the degradation of RNA and single-stranded DNA during several plant growth and developmental processes, including senescence. However, in the case of senescence the corresponding genes have not been reported. We describe the identification and characterization of BFN1 of Arabidopsis, and demonstrate that it is a senesce
American Society of Plant Physiologists.
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8. An alternative methylation pathway in lignin biosynthesis in Zinnia.
S-Adenosyl-L-methionine:trans-caffeoyl-coenzyme A 3-O-methyltransferase (CCoAOMT) is implicated in disease resistant response, but whether it is involved in lignin biosynthesis is not known. We isolated a cDNA clone for CCoAOMT in differentiating tracheary elements (TEs) induced from Zinnia-isolated mesophyll cells. RNA gel blot analysis showed that the expr
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9. A RING Domain Gene Is Expressed in Different Cell Types of Leaf Trace, Stem, and Juvenile Bundles in the Stem Vascular System of Zinnia1
The in vitro zinnia (Zinnia elegans) mesophyll cell system, in which leaf mesophyll cells are induced to transdifferentiate into tracheary elements with high synchrony, has become an established model for studying xylogenesis. The architecture of the stem vascular system of zinnia cv Envy contains three anatomically distinct vascular bundles at different sta
American Society of Plant Biologists.
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10. Cadmium-Induced Changes in Antioxidative Systems, Hydrogen Peroxide Content, and Differentiation in Scots Pine Roots1
To investigate whether Cd induces common plant defense pathways or unspecific necrosis, the temporal sequence of physiological reactions, including hydrogen peroxide (H2O2) production, changes in ascorbate-glutathione-related antioxidant systems, secondary metabolism (peroxidases, phenolics, and lignification), and developmental changes, was characterized in
American Society of Plant Physiologists.
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11. The Time Course of Xylem Differentiation and Its Relation to Deoxyribonucleic Acid Synthesis in Cultured Coleus Stem Segments
The relationship between DNA synthesis and wound xylem differentiation was investigated in cultured stem segments of Coleus blumei. The addition of 50 micrograms of indoleacetic acid per liter to the culture medium resulted in a 400 to 500% increase in the number of wound vessel members formed in 7 days. However, the time course of wound vessel member format