Red Far Red Ratio
Mostrando 1-12 de 46 artigos, teses e dissertações.
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1. Comportamento germinativo de espécies rupícolas de inselbergs do Morro da Urca, Rio de Janeiro - RJ / Seed germination behaviour of species of inselbergs rupicolous of the Morro da Urca, Rio de Janeiro, RJ.
Inselbergs são afloramentos rochosos isolados que emergem abruptamente acima das planícies que os circundam, formados principalmente por afloramentos de rochas graníticas e gnáissicas. São lugares com alta diversidade e endemismo, e caracterizados por alto grau de insolação, temperaturas do ar e do solo, com ventos fortes e solos com baixa retenção
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2012
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2. Fisiologia, bioquÃmica e morfologia da germinaÃÃo de mandacaru (Cereus jamacaru D.C.) / PHYSIOLOGY, BIOCHEMISTRY AND MORPHOLOGY OF MANDACARU (Cereus jamacaru D.C.) GERMINATION
The aim of this work was to study the physiology, biochemistry and morphology of mandacaru (Cereus jamacaru D.C) germination. Firstly, we analyzed the effects of light and temperature on mandacaru germination under four light treatments (white, dark, red and far-red) associated to six different temperatures [15, 20, 20-30 (alternated), 25, 30 and 35ÂC]. The
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/02/2009
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3. Germination in seed species ingested by opossums: implications for seed dispersal and forest conservation
Com o objetivo de fornecer conhecimento adicional acerca das estratégias de germinação adotadas por espécies de plantas zoocóricas da Região Neotropical, foram examinadas a dormência e germinação de sementes consumidas por marsupiais do gênero Didelphis. As sementes foram obtidas de fezes dos animais capturados em armadilhas, sendo então analisada
Brazilian Archives of Biology and Technology. Publicado em: 2007-11
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4. Dynamics of gaps / Dinamica de clareiras : comportamento de especies pioneiras e fatores que afetam sua colonização
The Mata Santa Genebra (22°49?45?S 47°06?33?W) is an isolated fragment of the Atlantic Forest. Due to the constant formation of gaps in the interior of the forest it becomes of fundamental importance the knowledge of the dynamics of these gaps for the preservation of the forest. The objectives of this paper were to record and analyze factors which could li
Publicado em: 2005
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5. Crescimento e atividade fotossintetica em duas especies de lianas de uma floresta estacional semidecidual
The lianas are copious in natural and man-made clearings and it appears that these forms of life require high irradiance for development and growth. Lianas are rooted in the soil and use other plants, especially trees as support. Since these plants begin their growth on the forest floor, then ascend to the canopy, they can experience extreme differences in r
Publicado em: 2004
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6. Modelling lucerne (Medicago sativa L.) crop response to light regimes in an agroforestry system
The general goal of this research was to understand the agronomic and physiological changes of a lucerne crop in distinct physical radiation environments and to verify the potential of lucerne to grow under shaded conditions. To achieve this, the research was conducted in four main steps: (i) firstly, experimental data collection in the field using two artif
Publicado em: 2002
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7. Germinação, crescimento, atividade fotossintetica e translocação de compostos de carbono em especies arboreas tropicais : estudo comparativo e influencia de sombreamento natural
Gennination, growth, photosynthesis and translocation of carbon in tropical tree species: a comparative study and the influence of natural shade. Light has been recognized as a major factor in species replacement during secondary sucession in forests. The degree of shade tolerance may be important in detennining successional sequences, since these are condit
Publicado em: 1996
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8. Far-Red Light Reflection from Green Leaves and Effects on Phytochrome-Mediated Assimilate Partitioning under Field Conditions
The influence of plant spacing and row orientation on spectral distribution of light received by growing soybean (Gylcine max [L.] Merr.) plants was measured under field conditions. Light absorption, reflection and transmission of individual leaves showed that most of the blue and red was absorbed while most of the far-red was either reflected or transmitted
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9. Light Harvesting in Anacystis nidulans Studied in Pigment Mutants 12
Spontaneous pigment mutants of Anacystis nidulans were self-selected for improved growth in far red light (> 650 nanometers). Questions were asked about those features of the light-harvesting mechanism which altered to give the mutants improved photosynthetic performance in far red. Answers were sought by comparing pigment and reaction center concentrations
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10. Fruit-Localized Phytochromes Regulate Lycopene Accumulation Independently of Ethylene Production in Tomato1
We show that phytochromes modulate differentially various facets of light-induced ripening of tomato fruit (Solanum lycopersicum L.). Northern analysis demonstrated that phytochrome A mRNA in fruit accumulates 11.4-fold during ripening. Spectroradiometric measurement of pericarp tissues revealed that the red to far-red ratio increases 4-fold in pericarp tiss
American Society of Plant Physiologists.
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11. Phytochromes B, D, and E Act Redundantly to Control Multiple Physiological Responses in Arabidopsis
Phytochrome-mediated perception of the ratio of red to far-red wavelengths in the ambient light environment is fundamental to plant growth and development. Such monitoring enables plants to detect neighboring vegetation and initiate avoidance responses, thus conferring considerable selective advantage. The shade avoidance syndrome in plants is characterized
American Society of Plant Biologists.
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12. Control by Phytochrome of Cytoplasmic and Plastid rRNA Accumulation in Cotyledons of Mustard Seedlings in the Absence of Photosynthesis 1
Light stimulates the accumulation of cytoplasmic and plastid rRNA in the cotyledons of mustard (Sinapis alba L.) seedlings. This effect is mediated by phytochrome. Continuous far red irradiation and brief red light pulses (the effect of which is reversible by brief far red light pulses) increase the amount of 1.3 × 106 + 0.7 × 106 and 1.1 × 106 + 0.56 ×