Phototropism
Mostrando 1-12 de 73 artigos, teses e dissertações.
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1. Impact of artificial lighting on the ecosystem / Influência da iluminação artificial sobre a vida silvestre: técnicas para minimizar os impactos, com especial enfoque sobre os insetos
The impact of light pollution on man and on the ecosystem is a rising concern among ecologists however, in the same time the human population is demanding more lighting for safety and comfort. In order to satisfy human lighting needs with a minimum impact on the ecosystem, manly on insects, we tested commercial equipments using different types of lights and
Publicado em: 2008
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2. Morfologia, biologia e fototropismo de Batrachedra nuciferae Hodges (Lepidoptera: Coleophoridae). / Morphology, biology and phototropism of batrachedra nuciferae hodges (lepidoptera: coleophoridae).
The aim of this work was to describe the outer morphology of Batrachedra nuciferae Hodges (egg, larvae, pupae and adults), to determine the duration and viability of the egg, larval, prepupal, pupal and adult stages, number of instars, growth ratio, sex ratio, preoviposition and oviposition periods, and fecundity of the species reared in male coconut (Cocos
Publicado em: 2004
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3. Phytochromes A and B Mediate Red-Light-Induced Positive Phototropism in Roots1
The interaction of tropisms is important in determining the final growth form of the plant body. In roots, gravitropism is the predominant tropistic response, but phototropism also plays a role in the oriented growth of roots in flowering plants. In blue or white light, roots exhibit negative phototropism that is mediated by the phototropin family of photore
American Society of Plant Biologists.
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4. Specific Inhibition of Phototropism in Corn Seedlings 1
Geotropism was used as a control for the specificity of potential inhibitors of phototropism by the coleoptiles of corn (Zea mays) seedlings. The compounds tested fall into three categories showing: (a) no inhibition of either phototropism or geotropism (KCl); (b) nonspecific inhibition of both phototropism and geotropism (KCN); and (c) specific inhibition o
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5. Evidence that zeaxanthin is not the photoreceptor for phototropism in maize coleoptiles.
The photoreceptor that mediates blue-light-induced phototropism in dark-grown seedlings of higher plants has not been identified, although the carotenoid zeaxanthin has recently been proposed as the putative chromophore. In the experiments described in this paper, we analyzed phototropism and a blue-light-induced protein phosphorylation that has been geneti
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6. Growth Distribution during Phototropism of Arabidopsis thaliana Seedlings.
The elongation rates of two opposite sides of hypocotyls of Arabidopsis thaliana seedlings were measured during phototropism by using an infrared imaging system. In first positive phototropism, second positive phototropism, and red light-enhanced first positive phototropism, curvature toward the light source was the result of an increase in the rate of elong
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7. The Rice COLEOPTILE PHOTOTROPISM1 Gene Encoding an Ortholog of Arabidopsis NPH3 Is Required for Phototropism of Coleoptiles and Lateral Translocation of AuxinW⃞
We isolated a mutant, named coleoptile phototropism1 (cpt1), from γ-ray–mutagenized japonica-type rice (Oryza sativa). This mutant showed no coleoptile phototropism and severely reduced root phototropism after continuous stimulation. A map-based cloning strategy and transgenic complementation test were applied to demonstrate that a NPH3-like gene deleted
American Society of Plant Biologists.
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8. Second Positive Phototropism Results from Coordinated Co-Action of the Phototropins and Cryptochromes1
Phototropism and hypocotyl growth inhibition are modulated by the coaction of different blue-light photoreceptors and their signaling pathways. How seedlings integrate the activities of the different blue-light photoreceptors to coordinate these hypocotyl growth responses is still unclear. We have used time-lapse imaging and a nontraditional mathematical
The American Society for Plant Biologists.
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9. Growth Retardant-Induced Changes in Phototropic Reaction of Vigna radiata Seedlings 1
The effect of growth retardants on phototropism has been studied in mung bean (Vigna radiata) seedlings. Ancymidol, tetcyclacis, and paclobutrazol inhibited phototropism while AMO 1618 and CCC were ineffective. The fluence-response relationships for phototropism of etiolated seedlings were similar to those previously described for monocots and other dicots.
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10. Interaction of Root Gravitropism and Phototropism in Arabidopsis Wild-Type and Starchless Mutants1
Root gravitropism in wild-type Arabidopsis and in two starchless mutants, pgm1-1 and adg1-1, was evaluated as a function of light position to determine the relative strengths of negative phototropism and of gravitropism and how much phototropism affects gravitropic measurements. Gravitropism was stronger than phototropism in some but not all light positions
American Society of Plant Physiologists.
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11. Mechanism of Specific Inhibition of Phototropism by Phenylacetic Acid in Corn Seedling 1
Using geotropism as a control for phototropism, compounds similar to phenylacetic acid that photoreact with flavins and/or have auxin-like activity were examined for their ability to specifically inhibit phototropism in corn seedlings using geotropism as a control. Results using indole-3-acetic acid, napthalene-1-acetic acid, naphthalene-2-acetic acid, pheny
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12. Light-induced phosphorylation of a membrane protein plays an early role in signal transduction for phototropism in Arabidopsis thaliana.
Blue light is known to cause rapid phosphorylation of a membrane protein in etiolated seedlings of several plant species, a protein that, at least in etiolated pea seedlings and maize coleoptiles, has been shown to be associated with the plasma membrane. The light-driven phosphorylation has been proposed on the basis of correlative evidence to be an early st