Cotyledon Expansion
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Hidrolases da parede celular em sementes de Euphorbia heterophylla L. durante a germinação e desenvolvimento inicial da plântula. / Cell wall hydrolases in the seeds of Euphorbia heterophylla L. during germination and early seedling development.
Na maioria das sementes a emergência da radícula caracteriza o término da germinação e marca o início do desenvolvimento da plântula. A atividade das hidrolases da parede celular durante a pré-emergência pode estar associada ao amolecimento do tecido que circunda o embrião, principalmente na região micropilar, onde ocorre a protrusão da radícula
Publicado em: 2001
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2. Light-Stimulated Cotyledon Expansion in Arabidopsis Seedlings (The Role of Phytochrome B).
Leaf and cotyledon expansion in dicotyledonous plants is a light-dependent developmental process. The unique role of phytochrome B has been tested by investigating expansion of cotyledons in wild-type and phytochrome-deficient mutants of Arabidopsis thaliana (L.) Heynh. A relatively rapid method for measuring cotyledon area was developed to quantify growth i
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3. Light-stimulated cotyledon expansion in the blu3 and hy4 mutants of Arabidopsis thaliana.
Cotyledon expansion in response to blue light was compared for wild-type Arabidopsis thaliana (L.) Heynh. and the mutants blu3 and hy4, which show reduced inhibition of hypocotyl growth in blue light. White, blue, and red light stimulated cotyledon expansion in both intact and excised cotyledons of wild-type seedlings (ecotypes No-0, WS, Co-0, La-er). Cotyle
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4. Deoxyribonucleic Acid and Ribonucleic Acid Synthesis during the Cell Expansion Phase of Cotyledon Development in Vicia faba L
In Vicia faba L., the tissue specific proteins, legumin and vicilin, are synthesized during the cell expansion phase of cotyledon development. During this growth period, RNA and nuclear DNA increase 8- to 10-fold. 3H-Uridine and 3H-adenosine are incorporated into ribosomal RNA, both 25S and 18S, and into transfer RNA. DNA isolated from cotyledons in the cell
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5. Cotyledon Expansion as a Bioassay for Cytokinins 1
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6. Effects of Wounding on Cytokinin Activity in Cucumber Cotyledons
Three known physiological responses to exogenous cytokinins were measured in wounded and nonwounded cotyledons from cucumber (Cucumis sativus L. cv Marketer) seedlings grown in darkness. Enhanced cell division, chlorophyll formation, and cotyledon expansion were detected in wounded cotyledons. The data suggest that wounding enhances endogenous cytokinin acti
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7. PP7 Is a Positive Regulator of Blue Light Signaling in Arabidopsis
The cryptochrome blue light photoreceptors mediate various photomorphogenic responses in plants, including hypocotyl elongation, cotyledon expansion, and control of flowering time. The molecular mechanism of cryptochrome function in Arabidopsis is becoming increasingly clear, with recent studies showing that both CRY1 and CRY2 are localized in the nucleus an
American Society of Plant Biologists.
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8. Developmental Biochemistry of Cottonseed Embryogenesis and Germination: VIII. Free Amino Acid Pool Composition during Cotyledon Development
The composition of the free amino acid pool in embryonic cotton (Gossypium hirsutum) cotyledons is quite distinct from that of endosperm, and that of germinated, greened cotyledons is quite distinct from that of leaves. During germination (including the precocious germination of immature seeds), the pool expands considerably showing a pronounced accumulation
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9. Ectopic expression of the Arabidopsis transcriptional activator Athb-1 alters leaf cell fate in tobacco.
The Arabidopsis thaliana Athb-1 is a homeobox gene of unknown function. By analogy with homeobox genes of other organisms, its gene product, Athb-1, is most likely a transcription factor involved in developmental processes. We constructed a series of Athb-1-derived genes to examine the roles of Athb-1 in transcriptional regulation and plant development. Athb
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10. ZEA3: A Negative Modulator of Cytokinin Responses in Plant Seedlings.
In Nicotiana plumbaginifolia cytokinins affect seedling development by inhibiting root growth and hypocotyl elongation and by stimulating cotyledon expansion. The zea3.1 mutant was selected for its inability to grow in conditions of low nitrogen and for its ability to grow independently on inhibitory concentrations of zeatin (J.D. Faure, M. Jullien, M. Caboc
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11. Genetic Interactions between Phytochrome A, Phytochrome B, and Cryptochrome 1 during Arabidopsis Development1
Single, double, and triple null combinations of Arabidopsis mutants lacking the photoreceptors phytochrome (phy) A (phyA-201), phyB (phyB-5), and cryptochrome (cry) 1 (hy4-2.23n) were examined for de-etiolation responses in high-fluence red, far-red, blue, and broad-spectrum white light. Cotyledon unhooking, unfolding, and expansion, hypocotyl growth,
American Society of Plant Physiologists.
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12. The Dof Transcription Factor OBP3 Modulates Phytochrome and Cryptochrome Signaling in ArabidopsisW⃞
Plants perceive subtle changes in light quality and quantity through a set of photoreceptors, including phytochromes and cryptochromes. Upon perception, these photoreceptors initiate signal transduction pathways leading to photomorphogenic changes in development. Using activation-tagging mutagenesis to identify novel light-signaling components, we have isola
American Society of Plant Biologists.