Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 72
Primeira ... 1234 ... Última
Imagem não selecionada

Imprime registro no formato completo
A model of nematode dynamics in the Westerschelde Estuary OMA
Li, J.; Vincx, M.; Herman, P.M.J..
We developed a time dynamic model to investigate the temporal dynamics of nematode community in the brackish zone of the Westerschelde Estuary. The biomass of four nematode feeding groups observed from March 1991 to February 1992 is used to calibrate the model. Using environmental data as the input, the model predicts the temporal modification and interrelation of four nematode feeding groups. Nematodes achieve a dominant position in the community because of their lower loss rate (in respiration, excretion and natural death). Predators which are deposit-feeding macrobenthos control the variations of dominant nematodes, such as omnivores and non-selective deposit feeders. Food availability causes modification only for rare nematodes such as epigrowth...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diatoms; Ecology; Food; Light; Marine nematodes; Meiobenthos; Population dynamics; Predation; Respiration; Temperature; Nematoda [Nematodes].
Ano: 1996 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7284
Imagem não selecionada

Imprime registro no formato completo
Abiotic Factors Affecting Seed Germination and Early Seedling Emergence of Large Crabgrass (Digitaria sanguinalis) Planta Daninha
WANG,Y.H.; MA,Y.L.; FENG,G.J.; LI,H.H..
ABSTRACT: Large crabgrass is one of the worst exotic weed in tropical, subtropical, and temperate regions of the world. In this study, the abiotic factors affecting seed germination and early seedling emergence of large crabgrass were investigated under laboratory conditions. The optimum temperatures of germination occurred at the range from 25 to 35 oC under 12 h light/12 h dark condition. Some seeds could germinate in the dark, but light exposure significantly stimulated the germination. Large crabgrass seed was tolerant to salinity level range of 0 to 160 and low water potential (11% germination at -0.8 MPa). Medium pH had no significant effect on seed germination and more than 90% seeds germination was obtained over a broad pH range from 4.0 to 10.0....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Temperature; Light; Osmotic potential; Heat-shock; Burial depth.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100268
Imagem não selecionada

Imprime registro no formato completo
Acclimation of photosynthesis to the light environment in rice International Rice Research Institute
Hubbart, Stella.
xii, 166 p. : ill. Thesis (Ph.D.) -- University of Sheffield
Tipo: Thesis Palavras-chave: Rice; Plant physiology; Photosynthesis; Light; Varieties.
Ano: 2004 URL: http://hdl.handle.net/123456789/392
Imagem não selecionada

Imprime registro no formato completo
Behavior of Layers under Different Light Sources Rev. Bras. Ciênc. Avic.
Tavares,BO; Pereira,DF; Bueno,LGF; Silva,GF.
ABSTRACT Light is an important factor in the management of laying poultry. The ideal lamp spectrum that provides the best welfare conditions still needs to be determined. Wavelength and light intensity influence poultry behavior and their welfare. This study evaluated the influence of four lamps types with different light spectra on the behavior of seventy 52-week laying hens. Incandescent, fluorescent, and sodium and mercury vapor lamps were set in a different poultry house each and supplied similar light intensities. Layer behavior was video-recorded three times weekly using video cameras installed on the ceiling. The effects of different wavelengths emitted by the light sources on layer behavior were evaluated by the Kruskal-Wallis median test. Results...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal behavior; Light; Animal precision.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000400511
Imagem não selecionada

Imprime registro no formato completo
CHEMICAL AGENTS AND SHADING LEVELS FOR THE PRODUCTION OF PEPPER SEEDLINGS REA
Binotti,Eliana D. C.; Costa,Edilson; Binotti,Flávio F. da S.; Batista,Thiago B..
ABSTRACT The aim of this study was to evaluate protected cultivation environments with different levels of shading and application of foliar chemical agents, on growth, photosynthetic pigments and seedling quality of Capsicum frutensens L. The experiment was developed at the State University of Mato Grosso do Sul, University Unit of Cassilândia, with chili pepper. Three cultivation environments (screen of 18, 35 and 50% of shading) and six leaf chemical agents were used [(1) control – without application; (2) Nitrogen (N) 1%; (3) Paclobutrazol 50 mg L-1 + N 1%; (4) Auxin 0.05 g L-1 + N 1%; (5) Gibberellin 0.05 g L-1 + N 1%; and (6) Auxin 0.05 g L-1 + Gibberellin 0.05 g L-1 + N 1%]. Each environment was considered an experiment in which the completely...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Auxin; Capsicum frutensens L; Gibberellin; Light; Nitrogen; Paclobutrazol.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000400450
Imagem não selecionada

Imprime registro no formato completo
Comportamento de plântulas de Sclerolobium paniculatum Vog. var. rubiginosum (Tul.) Benth. sob diferentes níveis de sombreamento, em viveiro Rev. Bras. Bot.
FELFILI,JEANINE MARIA; HILGBERT,LUÍS FERNANDO; FRANCO,AUGUSTO CÉSAR; SOUSA-SILVA,JOSÉ CARLOS; RESENDE,ALBA VALÉRIA; NOGUEIRA,MARIA VALDENETE PEREIRA.
As perturbações por desmatamentos, queimadas e mineração nas matas de galeria estão se avolumando em função do desenvolvimento econômico, gerando desequilíbrio ecológico e tornando necessários estudos que possibilitem a recuperação deste ecossistema. O objetivo deste trabalho foi o de avaliar, em viveiro, a resposta da espécie Sclerolobium paniculatum submetida a quatro níveis de sombreamento. O delineamento experimental foi inteiramente casualizado, com quatro tratamentos e quinze repetições. Cada tratamento representou uma fase da sucessão em floresta natural: pleno sol, simulando uma condição de área degradada; condição de clareira, com aproximadamente 50% de sombreamento; dossel da mata, em fase de fechamento, com sombreamento médio de 70%; dossel...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gallery forests; Light; Shading; Brazil.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000500011
Imagem não selecionada

Imprime registro no formato completo
Crescimento de freijó (Cordia goeldiana Huber) em plantios experimentais. Infoteca-e
CARPANEZZI, A. A.; YARED, J. A. G..
bitstream/item/30794/1/CPATU-BP26.pdf
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Freijo; Recru; Linha; Luz; Efeito; Floresta Nacional do Tapajos; Belterra; Santarém; Pará; Brasil; Brazilian walnut; Growth; Effect; Plantation; Line.; Crescimento; Cordia Goeldiana; Plantio; Química; Solo.; Amazonia; Chemistry; Light; Soil..
Ano: 1981 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/379784
Imagem não selecionada

Imprime registro no formato completo
Dial behavioral responses of Metamysidopsis elongata atlantica (Crustacea, Mysida) to gradients of salinity and temperature Iheringia, Sér. Zool.
Gama,Andréa M. da S; Calazans,Danilo; Fontoura,Nelson F.
Metamysidopsis atlantica elongata (Bascescu, 1968) is a common mysid in the surf zone of sandy beaches from the state of Rio Grande do Sul, Brazil, where it is frequently recorded forming dense aggregations. Trough laboratory trials, behavioral responses to salinity (10, 20, 25, 28, 30, 40 e 45), temperature (10, 15, 20, 30±1ºC) and light (yes/no) were tested using adult males, adult females and juveniles. Although there was no response to temperature, the species showed clear response to salinity and light. In the presence of light, organisms remained in the bottom of the aquaria, but moved to surface when bottom salinities were increased. In the absence of light, adults moved to the surface. However, juveniles moved down to or remained on the bottom,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mysids; Behavior; Light; Predation.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212011000100014
Imagem não selecionada

Imprime registro no formato completo
Diversity and Variability of the Cорероd Behaviour in Environmental Gradients: an Overview IBSS Repository
Seregin, S. A.; Piontkovski, S. A..
The overview is based on results of long-term experimental studies оf the authors and literature data, and applies to copepod species from plankton of the Black Sea, the Mediterranean Sea and the Atlantic Ocean. The work has incorporated the analysis of diversity and variability of the locomotory acts under the impact of abiotic factors: light, temperature, salinity, and the turbulent diffusion. Variability of locomotory activity depending on intensity, orientation (for the scalar factors), from a various combination of the environmental factors is shown. One of the mechanisms of a preferred conditions selection and phenomenon of a polymodality of copepod distribution in gradient conditions of environment is analyzed on an example of Acartia clausi...
Tipo: Journal Contribution Palavras-chave: Diversity; Copepod behaviour; Light; Temperature; Salinity; Turbulent diffusion; Pазнообразие; Поведение копепод; Свет; Температура; Соленость; Турбулентная диффузия Light Temperature Salinity Turbulent diffusion Light Temperature Salinity http://aims.fao.org/aos/agrovoc/c_4322 http://aims.fao.org/aos/agrovoc/c_7657 http://aims.fao.org/aos/agrovoc/c_6751.
Ano: 2003 URL: http://repository.ibss.org.ua/dspace/handle/99011/148
Imagem não selecionada

Imprime registro no formato completo
Ecophysiology of seed germination in Digitaria insularis ((L.) Fedde) Rev. Ciênc. Agron.
Mendonça,Giovana Soares de; Martins,Cibele Chalita; Martins,Dagoberto; Costa,Neumárcio Vilanova da.
The invasive behaviour of sourgrass (Digitaria insularis) in cultivated areas is due to its strategy of aggressive regeneration, which is based on seed germination. Knowledge of the physiological ecology of this species can contribute to the development of management and control strategies. The aim of this research was to understand the effects of provenance, temperature and light on the germination of sourgrass seeds collected in the Brazilian state of São Paulo in the cities of Americana, Botucatu and São José do Rio Preto and in the state of Paraná in the city of São Miguel do Iguaçu. The seeds were left to germinate at temperatures of 15, 25, 35 and 45 °C, both with and without light. The number of normal seedlings was recorded daily from seven to 60...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sourgrass; Plant physiology; Provenance; Light; Temperature.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000400021
Imagem não selecionada

Imprime registro no formato completo
Effect of different levels of light and drought stress on individual spikelet filling in rice (Oryza sativa L.) International Rice Research Institute
Begum, Ferdous Ara.
173 l. : ill. Thesis (Ph.D.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Light; Water stress; Inflorescences; Filling period; Yields; Plant physiology.
Ano: 1990 URL: http://hdl.handle.net/123456789/1064
Imagem não selecionada

Imprime registro no formato completo
Effect of light and temperature on seed germination in Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae) Biota Neotropica
Simão,Edson; Takaki,Massanori.
The effect of light and temperature on Tibouchina mutabilis seed germination was analyzed by isothermic incubations in the range of 10 to 40 °C, with 5 °C intervals under both continuous white light (32.85 µmolm-2s-1) and darkness and alternating temperatures (15-20; 15-25; 15-30; 15-35; 20-25; 20-30; 20-35; 25-30; 25-35 and 30-35 °C) under both photoperiod of 12 hours and continuous darkness. The seeds of T. mutabilis need light to trigger the germination and no germination was observed in darkness. The range of optimum temperatures for germination was between 25 to 30 °C and the 20-25 °C alternating temperatures. These results indicate that T. mutabilis behaves as a pioneer species and daily alternating temperatures did not change the light sensitivity...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Light; Phytochrome; Seed germination; Tibouchina.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000200006
Imagem não selecionada

Imprime registro no formato completo
Effect of some environmental factors on seed germination of Eryngium caeruleum M. Bieb. populations Acta Botanica
Rezvani,Mohammad; Zaefarian,Faezeh.
ABSTRACT The effects of alternating and constant temperatures and light regimes, osmotic and salt stress and pH were tested on seed germination in four populations of Eryngium caeruleum. Laboratory experiments revealed that the four populations exhibited different responses to alternating temperature and light conditions. Alternating temperature and photoperiod had a greater positive effect on seed germination compared to complete darkness. The optimal constant temperature within 10 ºC to 15 ºC for seed germination of each population was determined in a light/dark photoperiod. Seed germination severely decreased under water stress and was completely inhibited at -0.8 MPa osmotic potential. Saline stress sharply decreased germination percentage. Germination...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Alternating and constant temperatures; Germination; Light; PH; Salt and osmotic stress.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000200220
Imagem não selecionada

Imprime registro no formato completo
Effects of chemical treatments and environmental factors on seed dormancy and germination of shepherd's purse (Capsella bursa-pastoris (L.) Medic.) Acta Botanica
Rezvani,Mohammad; Zaefarian,Faezeh; Amini,Vajihe.
Shepherd's purse (Capsella bursa-pastoris) is a problematic weed in citrus orchards and crop fields in northern Iran. In a series of laboratory and greenhouse experiments, we evaluated the effects that treatment with gibberellic acid (GA3) and potassium nitrate (KNO3), as well as environmental factors, including temperature, the duration of pre-chilling (wet and dry), drought stress, salt stress, pH, and sowing depth, have on seed dormancy breaking and germination in C. bursa-pastoris. Treatment with GA3 strongly stimulated germination of C. bursa-pastoris in conditions of light/dark and continuous darkness. The germination rate was highest (40.08%) for seeds treated with 400 ppm of GA3 in the light/dark condition. Treatment with KNO3 did not significantly...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Drought and salt stress; Gibberellic acid; Light; Temperature; Sowing depth.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000400002
Imagem não selecionada

Imprime registro no formato completo
Effects of Environmental Factors on Seed Germination and Emergence of Velvetleaf (Abutilon theophrasti) Planta Daninha
XIONG,RC.; MA,Y.; WU,HW.; JIANG,WL.; MA,XY..
ABSTRACT: Velvetleaf, an annual broadleaf weed, is a common and troublesome weed of cropping systems worldwide. Laboratory and field experiments were conducted to determine the effects of environmental factors on germination and emergence of velvetleaf. Seeds germinated over a range of constant temperatures from 10 to 40 oC regardless of light conditions, but no germination occurred at temperature below 5 oC and beyond 50 oC. Seeds germinated at alternating temperature regimes of 15/5 to 40/30 oC, with maximum germination (>90%) at alternating temperatures of 40/30 oC. Germination was sensitive to water stress, and only 0.4% of the seeds germinated at the osmotic potential of -0.4 MPa. There was no germination at ? 0.6 MPa. Moreover, germination was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Burial depth; Light; Osmotic potential; Saline and alkaline stress; Temperature.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100321
Imagem não selecionada

Imprime registro no formato completo
Effects of light and nutrients on different germination phases of the Cosmopolitan moss Bryum argenteum Hedw. (Bryaceae) BABT
Silva,Adaíses Simone Maciel da; Pôrto,Kátia Cavalcanti; Simabukuro,Eliana Akie.
The influence of light and nutrients on the different germination phases of Bryum argenteum spores was studied. The following treatments were used: distilled water and nutrient solution under light (12 h) and continuous darkness. The spores germinated when exposed to light, independent of both medium used. Under darkness, the spores swelled and became chlorophyllous. In the presence of nutrient solution, the germination occurred earlier (after two days) when compared to the distilled water (after more than three days). Nutrients were needed to complete the last germination phase in the majority of spores and to provide the protonemal growth.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bryophyte; Physiology; Germination; Protonema; Light; Nutrients.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000400003
Imagem não selecionada

Imprime registro no formato completo
Effects of light and temperature on seed germination in Cecropia hololeuca Miq. (Cecropiaceae) BABT
Godoi,Simone; Takaki,Massanori.
Seeds of Cecropia hololeuca were submitted to regimes of constant and alternating temperatures, associated with photoperiods of white light, "shade light" and continuous darkness under controlled conditions in laboratory. Seeds did not germinate at constant temperatures of 10°C to 20°C and above 35°C. Seeds only germinated in the darkness when the temperature was alternated. "Shade light" inhibited germination. We concluded that the regime of alternating temperatures suppressed the light effects on seed germination of this species.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cecropia hololeuca; Germination; Alternating temperature; Phytochrome; Light.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000200004
Imagem não selecionada

Imprime registro no formato completo
Environmental and physiological factors that affect the efficacy of herbicides that inhibit the enzyme protoporphyrinogen oxidase: a literature review Planta Daninha
Matzenbacher,F.O.; Vidal,R.A.; Merotto Jr.,A; Trezzi,M.M..
Herbicides that inhibit the enzyme protoporphyrinogen oxidase (PROTOX) are usually effective to control dicotyledonous weeds and their agronomic efficacy is affected by environmental and physiological factors. The objective of this review is to summarize the knowledge of those factors available in the scientific literature in the last decade. Environmental factors that influence PROTOX inhibitors include temperature, irradiance and relative humidity. The most relevant physiological factors are the activity of enzymes that can detoxify herbicides and also of enzymes that mitigate the effects of oxidative stress in plants. The study also suggests some possible management strategies that could optimize the activity of PROTOX-inhibiting herbicides.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Temperature; Light; Relative humidity; Enzymes.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200024
Imagem não selecionada

Imprime registro no formato completo
Environmental factors controlling biomass development of seagrass meadows of Zostera noltei after a drastic decline (Arcachon Bay, France) ArchiMer
Cognat, Mathis; Ganthy, Florian; Auby, Isabelle; Barraquand, Frederic; Rigouin, Loic; Sottolichio, Aldo.
The relative impact of light, depth, hydrology, hydrodynamics, sediment and nutrients on growth of the seagrass Zostera noltei was investigated in Arcachon Bay, where the extent of seagrass beds has been decreasing for 20 years. A comprehensive multi-parameter survey of 9 sites was conducted monthly over one year. A three-parameter logistic growth model was fitted to biomass data to unravel the relative contributions of environmental factors on seagrass growth. The present study highlights the fact that, in addition to the dominant positive effect of light on plant growth, the hydrological and hydrodynamic parameters were important drivers for Z. noltei growth at the scale of the whole Bay. At the scale of individual sites, other factors such as macroalgal...
Tipo: Text Palavras-chave: Physical parameters; Light; Hydrodynamics; Adaptation; Statistical growth model.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00451/56229/57789.pdf
Imagem não selecionada

Imprime registro no formato completo
Environmental physiology of the bananas (Musa spp.) Braz. J. Plant Physiol.
Turner,David W.; Fortescue,Jeanie A.; Thomas,Dane S..
The bananas are thought to be particularly sensitive to changes in the environment. This review considers some historical and recent investigations into the response of the leaf, root and reproductive system to the environment. Monteith's analysis of the response of plants to intercepted radiation is appropriate for analyzing the productivity of bananas and plantains. The banana is sensitive to soil water deficits, and expanding tissues such as emerging leaves and growing fruit are among the first to be affected. As soil begins to dry, stomata close and leaves remain highly hydrated, probably through root pressure. Productivity is affected because of the early closure of stomata. We find the common belief that bananas use large amounts of water does not...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crop yield; Leaf system; Light; Photoperiod; Photosynthesis; Reproductive system; Root system; Temperature; Water supply.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400013
Registros recuperados: 72
Primeira ... 1234 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional