Consulta: subjectFacets:"Photoperiod"
Registros recuperados: 41
Data/hora: 15/06/2024 15:29:14

El fotoperiodo y su relación con la reproduccón del venado cola blanca (Odocoileus virginianus miquihuanensis) en el Altiplano Potosino.
Provedor de dados: 32
Autores: Arenas Baéz, Pablo.
En México el venado cola blanca es la especie más importante en la actividad cinegética por su derrama económica, lo que ha motivado a manipular la reproducción de esta especie para garantizar su conservación y aprovechamiento sustentable en el territorio nacional. Por tal motivo se llevó a cabo la presente investigación con el objetivo de definir la época reproductiva del venado cola blanca (O. v. miquihuanensis) en el Altiplano Potosino, la calidad de semen, la relación del fotoperiodo en la producción y la calidad de semen, y generar un índice de calidad de semen de venado. Se utilizaron 3 venados machos adultos con edades de 3½, 4½ y 6½. La obtención del semen se realizó mensualmente por electro-eyaculación, y fue evaluado en base a motilidad masal...
Palavras-chave: Calidad de semen; Fotoperiodo; Reproducción; Venado cola blanca; Semen quality; Photoperiod; Reproduction; White-tailed deer; Ganadería; Maestría.
Ano: 2011
URL: http://hdl.handle.net/10521/565

El fotoperiodo y su relación con la reproduccón del venado cola blanca (Odocoileus virginianus miquihuanensis) en el Altiplano Potosino.
Provedor de dados: 32
Autores: Arenas Baéz, Pablo.
En México el venado cola blanca es la especie más importante en la actividad cinegética por su derrama económica, lo que ha motivado a manipular la reproducción de esta especie para garantizar su conservación y aprovechamiento sustentable en el territorio nacional. Por tal motivo se llevó a cabo la presente investigación con el objetivo de definir la época reproductiva del venado cola blanca (O. v. miquihuanensis) en el Altiplano Potosino, la calidad de semen, la relación del fotoperiodo en la producción y la calidad de semen, y generar un índice de calidad de semen de venado. Se utilizaron 3 venados machos adultos con edades de 3½, 4½ y 6½. La obtención del semen se realizó mensualmente por electro-eyaculación, y fue evaluado en base a motilidad masal...
Palavras-chave: Calidad de semen; Fotoperiodo; Reproducción; Venado cola blanca; Semen quality; Photoperiod; Reproduction; White-tailed deer; Ganadería; Maestría.
Ano: 2011
URL: http://hdl.handle.net/10521/565

Allelic variation at the Vrn-A1, Vrn-B1, Vrn-D1, Vrn-B3 and Ppd-D1a loci of Pakistani spring wheat cultivars
Provedor de dados: 69
Autores: Iqbal,Muhammad; Shahzad,Armghan; Ahmed,Iftikhar.
Flowering time in bread wheat (Triticum aestivum L.) is controlled by vernalization and photoperiod response, and earliness per se genes. The genetic basis of flowering time has not been investigated in Pakistani bread wheat. This study was, therefore, conducted to determine the allelic composition at Vrn-A1, Vrn-B1, Vrn-D1, Vrn-B3 and Ppd-D1a loci of 59 Pakistani spring bread wheat cultivars. These cultivars, along with 4 isogenic lines for vernalization genes were characterized with previously reported DNA markers designed for detecting allelic variation at 4 Vrn (Vernalization) and 1 Ppd (Photoperiod) loci. Spring habit Vrn-A1a allele was found in 36% cultivars either alone or with spring habit Vrn-B1 and Vrn-D1 alleles. Two wheat cultivars had the...
Tipo: Journal article
Palavras-chave: Photoperiod; Spring growth habit; Triticum aestivum; Vernalization.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000100001

A genetic framework for flowering-time pathways in Citrus spp.
Provedor de dados: 74
Autores: Dornelas,Marcelo Carnier; Camargo,Raquel Luciana Boscariol; Figueiredo,Luciana Harumi Morimoto; Takita,Marco Aurélio.
Floral transition is one the most drastic changes occurring during the life cycle of a plant. The shoot apical meristem switches from the production of leaves with associated secondary shoot meristems to the production of flower meristems. This transition is abrupt and generally irreversible, suggesting it is regulated by a robust gene regulatory network capable of driving sharp transitions. The moment at which this transition occurs is precisely determined by environmental and endogenous signals. A large number of genes acting within these pathways have been cloned in model herbaceous plants such as Arabidopsis thaliana. In this paper, we report the results of our search in the Citrus expressed sequence tag (CitEST) database for expressed sequence tags...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reproductive development; Flowering-time genes; Reproduction; Photoperiod; CONSTANS.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000500006

Influence of long days on the production of cut chrysanthemum cultivars
Provedor de dados: 75
Autores: Zandonadi,Alessandra S; Maia,Ciro; Barbosa,José Geraldo; Finger,Fernando Luiz; Grossi,José Antônio S.
ABSTRACT Chrysanthemum is one of the most widely marketed cut flower in the world. For this flower cultivation, long days to induce vegetative growth are required, until the plant reaches the necessary size for commercial flowering. The aim of this study was to evaluate the influence of the number of long days on the production of floral stems of five cut chrysanthemum cultivars. The experiment was evaluated in a randomized block design with split plots, with two factors and three replicates. Considering the number of long days (21, 28, 35, 42 and 49) the plots, and sub-plots the cut chrysanthemum cultivars (Calábria, Dragon, Sheena, Apricot Repin and Rebasco). We noticed significant differences for most of morphological traits for number of long days, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chrysanthemum morifolium; Genotype; Flowering; Cultivation time; Photoperiod.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000100033

Growth, molt and survival of Palaemonetes argentinus (Decapoda, Caridea) under different light-dark conditions
Provedor de dados: 76
Autores: Díaz,Ana Cristina; Sousa,Liliana G.; Cuartas,Elena I.; Petriella,Ana María.
Growth, survival and molting rate in Palaemonetes argentinus Nobili, 1901 were compared under different light-dark conditions. During 80 days, 150 immatures of both sexes (initial mean weight 0.09±0.002g), from Los Padres lagoon, Mar del Plata, Argentina, were maintained in aquaria at 19±0.4°C under three light conditions: 0:24, 10:14 and 13:11 (L-D). They were fed daily on an artificial diet (45% proteins, 17.2% lipids, 7% water, 7% ash). Good weight increment was obtained with the three treatments, finding a positive linear correlation between mean weight and time (0:24, r=0.97; 10:14, r=0.99; 13:11, r=0.98). There were no significant differences in the percentage increment in mean weight among the treatments (0:24, 19.3%; 10:14, 29.3% and 13:11, 26.5%)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth; Molt; Photoperiod; Crustacea; Palaemonidae.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212003000300004

Guandu para produção de forragem e de grãos no Semiárido cearense.
Provedor de dados: 14
Autores: GUEDES, F. L.; POMPEU, R. C. F. F.; SOUZA, H. A. de; ROGERIO, M. C. P.
Avaliar o desempenho produtivo de grãos, biomassa sob condições de sequeiro do Semiárido e verificar as relações com as variáveis do sistemara dicular do guandu em região de fotoperíodo neutro.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Gramínea Forrageira; Leguminosa com Grão; Cajanus Cajan; Biomassa.; Forage grasses; Biomass; Photoperiod; Brazil.
Ano: 2019
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1117099

Equacao e programa de microcomputador para calculo do fotoperiodo diario.
Provedor de dados: 14
Autores: CARVALHO, L. J. C. B.; URBEN FILHO, G.; LUCHIARI JUNIOR, A.; GOMIDE, R. L.; SOUSA, M. C. de.
bitstream/item/101046/1/doc-14.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Luz solar; Calculo; Programa; Fotoperiodo; Programacao; Savanna; Computer program; Sunlight; Programming; Software.; Computador; Cerrado; Microcomputador; Radiação Solar.; Radiação; Photoperiod; Solar radiation.
Ano: 1985
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/547431

Upland rice in Brazil.
Provedor de dados: 14
Autores: HEINEMANN, A. B.; STONE, L. F.; SILVA, S. C. da; SANTOS, A. B. dos.
Upland rice in Brazil: Characterization of the production area. Yield potential. Agrometeorological conditions of yield. Air temperature. Solar radiation. Photoperiod. Rain. Climate zoning risk. Irrigation.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Arroz; Oryza Sativa; Produtividade; Sistema de Produção; Radiação Solar; Temperatura; Ar; Irrigação; Rice; Irrigation; Crop production; Yields; Air temperature; Solar radiation; Photoperiod.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1137145

Influence of early thermic and photoperiodic control on growth and smoltification in Atlantic salmon (Salmo salar)
Provedor de dados: 5
Autores: Gaignon, Jean-louis; Quemener, Loic.
Atlantic salmon juveniles were subjected to a precocious (day 104 after first feeding) photoperiodic (P) and thermic (T) control. After rearing the fry at 16 degrees C, constant (16 hours of light and 8 hours of darkness, 16 degrees C) (C) and shortened simulated natural S photoperiod and temperature regimes were used in a factorial experimental design until transfer to seawater. The growth obtained with constant (C) regimes was better than with S regimes. In all cases, we observed very early (day 141, mid-June) a clear segregation of the population into two different subpopulations. Among the conditions, all the differences between the upper and lower modes were growth-dependent. We observed different developmental trends of the gill (Na+-K+)-ATPase...
Tipo: Text
Palavras-chave: Photopériode; Température; Smolts 0+; Saumon atlantique; Photoperiod; Temperature; 0(+) smolts; Atlantic salmon.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00190/30159/28746.pdf

No efficiency of the lateral system on nocturnal feeding in the European sea bass (Dicentrarchus labrax L.)
Provedor de dados: 5
Autores: Faucher, Karine; Dutto, Gilbert; Coves, Denis; Aubert, Anne; Lagardere, Jean-paul.
In order to evaluate the effect and consequence of lateral system inactivation on fish nocturnal feeding, the differential growth of groups of European sea bass maintained in different rearing conditions were compared. Whereas some fish with intact lateral system (placebo fish) were placed under a photoperiod of 12-L: 12-D, other placebo fish were kept in the dark. In the same way, fish deprived of lateral system by section of their lateral system nerves and antibiotic treatment were placed under a photoperiod of 12-L: 12-D and the others in the dark. For each of these four rearing conditions, two sets of experiment were realized. Percent mortality, feed rhythm, averaged daily feed demand, specific growth rate and feed efficiency were compared among these...
Tipo: Text
Palavras-chave: Feed efficiency; Growth; Nocturnal feeding; Photoperiod; Lateral system; European sea bass.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2267.pdf

A Digitalis purpurea elite population starting from a population grown wild
Provedor de dados: 46
Autores: Papone,Mirta; Mascarini,Alba; Fatta,Nora.
D.purpurea is grown in cold areas with long days. In the Buenos Aires province market it is absent, probably because it is a complicated and expensive crop. The horticultural growers prefer the imported costly hybrid seed because plants flower without suplementary light or cold. The objectives of the experiments which were laid out were to find, among the individuals of a population grown wild, genotypes that responded to the Buenos Aires conditions, producing plants induced in pots and assesing if there was response to natural aggregates. Seed harvested in Bariloche was sown on the 29/05/o4. The plants were transplanted to 3 liter pots. 30 pots were placed in greenhouse and treated with chemical fertilization. 54 pots were placed outdoors in the sun and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photoperiod; Vernalization; Natural fertilizer; Seed.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332008000100004

Photoperiodism and seasonality in neotropical population of Plutella xylostella L. (Lepidoptera: Yponomeutidae)
Provedor de dados: 82
Autores: Campos,Wellington G.
Neotropical populations of the diamondback moth Plutella xylostella L. have seasonal cycles of growth and decrease, and moth migration plays a fundamental role in generating such population dynamics. Since the oscillation of these populations is predictable, photoperiod might operate as a signal that triggers the migratory behaviour of the insect. Migration in insects is usually preceded by reproductive diapause, a photoperiodic response that can be characterised by morphological, physiological and behavioural alterations that permit to discriminate between migratory and non-migratory forms. In this study, I tested whether the pre-imaginal and reproductive development of P. xylostella from Minas Gerais (Brazil) is affected by artificial day-lengths that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Day-length; Diapause; Migration; Photoperiod; Population dynamics.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000400003

Cage evaluation of augmentative biological control of Thrips palmi with Wollastoniella rotunda in winter greenhouses
Provedor de dados: 19
Autores: Nakashima, Yoshitaka; Uefune, Masayoshi; Tagashira, Eiko; Maeda, Seiko; Shima, Katsuya; Nagai, Kazuya; Hirose, Yoshimi; Takagi, Masami.
Cage trials of an anthocorid predator, Wollastoniella rotunda Yasunaga et Miyamoto, as a biological control agent of Thrips palmi Karny were conducted in Fukuoka, Japan, under winter greenhouse production conditions. Females of W. rotunda were released on caged eggplants, and placed in two greenhouses on 27 October. The development, population growth, and effectiveness of W. rotunda were observed until early March. Results from the cage trials showed that W. rotunda successfully developed, reproduced, and suppressed T. palmi populations under the conditions found in winter greenhouses. During the experiment, one full generation and a second generation of adult predators occurred. The T. palmi population which was exposed to predators remained at a low...
Palavras-chave: Reproductive diapause; Photoperiod; Development; Winter; Wollastoniella rotunda; Orius; Biological control; Thrips palmi; Solanum melongena; Dicyphus tamaninii; Frankliniella occidentalis; Piocoris varius.
Ano: 2004
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/808

Shoot growth of Merlot and Cabernet Sauvignon grapevine varieties
Provedor de dados: 86
Autores: Borghezan,Marcelo; Gavioli,Olavo; Vieira,Hamilton Justino; Silva,Aparecido Lima da.
The objective of this work was to evaluate shoot growth of the grapevine varieties Merlot and Cabernet Sauvignon, during 2006/2007, and Cabernet Sauvignon, during 2008/2009, in São Joaquim, SC, Brazil. The experiment was carried out in a commercial vineyard trained on a vertical trellis system. The shoots of the central part of the plants were selected, and the lengths from the base to the apex of 20 shoots per cultivar were evaluated. In 2006/2007, monitoring began at pruning, on 9/15/2006, and ended on 2/6/2007, totalizing 144 days of evaluation. During the 2008/2009 cycle, phenology and shoot growth for 'Cabernet Sauvignon' were assessed from grape development (1/13/2009) (pea-sized grapes) until shoot vegetative growth had ceased. Budburst occurred in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Photoperiod; Temperature; Vegetative growth.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000200008

EFFECTS OF ENVIRONMENTAL FACTORS ON SEED GERMINATION AND EMERGENCE OF GLYPHOSATE RESISTANT AND SUSCEPTIBLE SOURGRASS
Provedor de dados: 87
Autores: MARTINS,J.F.; BARROSO,A.A.M.; ALVES,P.L.C.A.
ABSTRACT Sourgrass is one of the most problematic weeds of Brazil. It is an aggressive species in the allocation of resources from the environment and reported to be glyphosate resistant in several states of the country. This work has aimed to verify environmental effects on seed germination and seedling emergence of sourgrass. Laboratory and field trials were conducted to determine the effects of temperature, light, photoperiod, water availability and depth of burial in germination and emergence of seeds. The maximum germination was greater than 80% for seed originated from resistant plants between 15 and 30 oC. For the susceptible ones, the maximum germination occurred only at 30 oC. Germination occurred for both biotypes independent of the presence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digitaria insularis; Water availability; Photoperiod; Seeds; Temperature.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100243

Germination and emergence of trumpet flower (tecoma stans) under different environmental conditions
Provedor de dados: 87
Autores: Reis,F.C.; Medina Sotomayor,J.F.; Garcia,D.B.; Barroso,A.A.M.; Albrecht,A.J.P.; Filho,R.V.
The aim of this work was to analyze the effect of temperature and light intensity on trumpet flower seed germination, as well as the effect of seeding depth on its emergence. To study the influence of temperature, nine temperature intervals were evaluated, ranging from 15.0 to 40.0 ºC. A randomized block design experiment was used with five replications and 20 seeds per replication, and performed twice. To evaluate light intensity on seed germination, a randomized experimental design was used with eight replications and 25 seeds per replication. The treatments applied were: photoperiod with temperature alternation; photoperiod with constant temperature; darkness with temperature alternation; and darkness with constant temperature. The photoperiod consisted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Light; Photoperiod; Photoblastism.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200005

Effect of Environmental Factors on Seed Germination and Early Seedling Emergence of Carolina geranium (Geranium carolinianum)
Provedor de dados: 87
Autores: LIU,X.; ZONG,T.; LI,Y.; ZHOU,X.; BAI,L.
ABSTRACT: Carolina geranium (Geranium carolinianum) is an emerging invasive weed in rape and wheat fields in China. A better understanding of its germination and emergence ecology will enable the development of integrated weed control strategies. In this study, we investigated the effects of temperature, photoperiod, soil water content, salinity, and burial depth, on germination and emergence of Carolina geranium. Germination percentages were over 74% under 15/20 and 20/25 oC night/day temperature regimes. Germination rate was independent of light/dark regime. Increasing salinity reduced germination of Carolina geranium from 81.1% at 0 mM to 0% at 160 mM NaCl. Seeds germination was peaked at 50% soil moisture, but was completely inhibited at &lt; 20% and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperature; Photoperiod; Salinity stress; Soil water content; Burial depth.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100335

INVESTIGATION OF THE MECHANISM OF RESISTANCE TO GLYPHOSATE HERBICIDE IN HAIRY FLEABANE
Provedor de dados: 87
Autores: KASPARY,T.E.; LAMEGO,F.P.; LANGARO,A.C.; RUCHEL,Q.; AGOSTINETTO,D.
ABSTRACT The resistance of weeds to herbicides is a consequence of one or more mechanisms in the plant, responsible for not allowing the herbicide to act properly at the active site. The objective of this study was to investigate the mechanism(s) of resistance to glyphosate in Conyza bonariensis. An experiment was conducted in November and December, 2012 and repeated in February and March, 2013 using a factorial arrangement of the treatments, where the factor A corresponded to biotypes of hairy fleabane, susceptible (S) and resistant (R); the factor B to seven rates of glyphosate from 0 to 11,520 g e.a. ha-1, and factor C were simulated environmental conditions of winter (12/8 oC day/night of temperature and 10/14 h of photoperiod) and summer (28/20 oC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conyza bonariensis; Temperature; Photoperiod; EPSPs.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000300555

Performance of Broilers Reared under Monochromatic Light Emitting Diode Supplemental Lighting
Provedor de dados: 89
Autores: Guevara,BDM; Pech,PS; Zamora,BR; Navarrete,SLF; Magaña,SHF.
ABSTRACT The purpose of this study was to evaluate the effect of green monochromatic light emitting diodes (LED) or white fluorescent lamps on the growth performance of broilers reared in open houses. Two hundred broilers (Ross 308) were sexed and divided into four treatments, according to sex and supplemental light source: T1, males under green LED; T2, males under fluorescent lamps; T3, females under green LED; and T4, females under fluorescent lamps, totaling 50 birds per treatment with five replicates each (n=10). Broilers of both sexes received natural light during the day and supplemental lighting (fluorescent or LED) during the night, according to age. Individual body weight, mortality, and feed intake were recorded weekly per replicate. Feed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Light Emitting Diode; Light intensity; Photoperiod; Light wavelength; Broiler.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000400553

Effect of Feed Restriction and Photoperiod on Reproduction and LEPR, MELR mRNA Expression of Layers
Provedor de dados: 89
Autores: HAO,E; Chen,H; Ge,S; Huang,R.
ABSTRACT Photoperiod and nutrition are major factors that affect the reproductive efficiency particularly in female animals. In this study we examined the interaction of photoperiod and food restriction on growth, sexual maturation and receptor mRNA expressions of leptin, melatonin, and estrogen in abdominal fat and the ovary of pullets. There were no interaction effects between photoperiod and feeding level on body weight, abdominal fat weight, ovary weight at both 14 wk and 18 wk. Abdominal fat weight of feed restriction group was significantly lower compared with the control group at the age of 14 wk, 18 wk, and age of the first egg (AFE) (p&lt;0.05). Ovary LEPR (Leptin receptor) gene expression showed an interaction effect of the first egg. Restricted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feed restriction; MELR; Ovary; Photoperiod; Pullet.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000300311

Biotechnology applied to salmoniculture
Provedor de dados: 96
Autores: Isler,Iván Valdebenito.
This work presents a conceptual analysis of the main biotechnologies used in Chilean salmoniculture, which is based on the production of Atlantic salmon (Salmo salar, 356.407 t),silver salmon or coho (Oncorhynchus kisutch, 116.481 t), (O. tshawytscha, 2.062 t) and rainbow trout (O. mykiss, 189.178 t).These activities are focused on the photoperiod artificial manipulation to obtain out-of-season spawning, in the use of hormonal therapies which allow synchronizing the final oocyte maturation (FOM) and sexual maturity acceleration or the increase in milt volume produced by males. Such actions are carried out using GnRHa in doses close to 10 µg/kg of fish. Once sexual maturity is reached, in vitro manipulation of gamets must often be done due to either the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biotechnology; Induced spawning; Photoperiod; Reproduction; Sex manipulation; Thermoperiod.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009001300004

Seasonal and circadian variation of the sexual behavior of Morada Nova rams in tropical environment
Provedor de dados: 96
Autores: Santos,Severino Guilherme Caetano Gonçalves dos; Saraiva,Edilson Paes; Pimenta Filho,Edgard Cavalcanti; Santos,Luana de Fátima Damasceno dos; Fonsêca,Vinícius de França Carvalho; Veríssimo,Tarsys Noan Silva; Almeida,Maria Elivania Vieira; Pinheiro,Antônio da Costa.
The objective of this study was to evaluate the seasonal and daily variation in sexual behavior of Morada Nova breeders raised in the Brazilian semi-arid region. The data were collected from four rams and 114 ewes of the Morada Nova breed - 55 females in the dry season and another 59 in the rainy season. Observations were performed in the dry and rainy seasons, divided into four times of the day: morning (05:01 h to 11.00 h), afternoon (11.01 h to 17.00 h), evening (17.01 h to 23:00 h), and dawn (23:01 h to 05.00 h). Sexual behavior was assessed for a period of 24 h/day, in a breeding season. One ram was used each three days. The behavioral patterns of the rams in view of females were observed during the recognition (sniffing the female urine, bouts of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dry season; Food resources; Libido; Photoperiod.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000100008

Artificial light and growth regulators on the in vitro etiolation of Cattleya labiata
Provedor de dados: 124
Autores: Rodrigues,Antonio Anderson de Jesus; Santos,Eder de Oliveira; Takane,Roberto Jun; Carvalho,Ana Cristina Portugal Pinto de.
ABSTRACT The technique of etiolation is widely used in the micropropagation of various plant species. The aim of this study was to evaluate growth and development in shoots of Cattleya labiata grown in vitro, as a function of growth regulators and the presence and absence of light. Stem segments, approximately ± 1.0 cm in height, were inoculated in test tubes containing 15.0 mL of MS culture medium supplemented with different concentrations of BAP (0.0, 2.0 and 4.0 mg L-1) and NAA (0.0, 1.0 and 2.0 mg L-1), and in different growth environments (growth room, darkness and a photoperiod of 16 hours) in a completely randomised design. At 150 days, the following were evaluated: a) number of etiolated shoots; b) number of nodes per etiolated shoot; c) length of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Orchidaceae; Tissue culture; Photoperiod; 6-benzylaminupurine; Naphthaleneacetic acid.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000200296

Tambaqui growth and survival when exposed to different photoperiods
Provedor de dados: 36
Autores: Aride,Paulo Henrique Rocha; Roubach,Rodrigo; Nozawa,Sérgio Ricardo; Val,Adalberto Luís.
The use of different photoperiods (light) were investigated during tambaqui (Colossoma macropomum) juvenile growth under captivity. Light intensity tested was: continuous dark (24hrs without light), natural photoperiod simulation (10hrs of light and 14hrs without light) and continuous light (24 with light). No mortality was recorded among treatments. Significant differences was observed after 50 days of experiment among mean fish weight, fish kept under a continuous darkness showed a better specific growth rate (6.02%) when compared to control fish (natural photo period, 3.67%). Fish exposed to continuous light presented the lowest mean specific growth rate (2.04%). It is possible to improve tambaqui juvenile weight gain performance when kept under...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colossoma macropomum; Juvenile fish; Photoperiod; Growth.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672006000300015

Phenodynamics of five orchids species growing on rock outcrops in the Chapada Diamantina Mountains in northeastern Brazil
Provedor de dados: 39
Autores: Santana,Karoline Coutinho de; Souza,Isys Mascarenhas; Miranda,Lia d'Afonsêca Pedreira de; Funch,Ligia Silveira.
ABSTRACT We evaluated the vegetative and reproductive phenological patterns of the orchids Cattleya elongata, Cyrtopodium aliciae, Epidendrum orchidiflorum, Epistephium lucidum, and Sobralia liliastrum (Orchidaceae) growing on sandstone outcrops in the Chapada Diamantina Mountains in northeastern Brazil. Phenological events were associated with abiotic factors, leaf longevity, life form, plant growth pattern, and pollination syndrome. Phenological observations were made for 18 months and followed the phenophases of: stem/pseudobulb emission, leaf flush, leaf fall, flowering, immature fruit and mature fruit. Seasonality, synchrony, and correlations between phenophases and environmental variables were tested. The orchid species demonstrated aseasonal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Campo rupestre; Flowering overlap; Photoperiod; Seasonality; Synchrony.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000300508

Responses of quinoa (Chenopodium quinoa Willd.) seeds stored under different germination temperatures
Provedor de dados: 1
Autores: Strenske, Andressa; Vasconcelos, Edmar Soares de; Egewarth, Vanessa Aline; Herzog, Neusa Francisca Michelon; Malavasi, Marlene de Matos.
In this experiment, we assessed the germination and vigor of quinoa seeds packed in paper bags and stored at room temperature for 36, 85, 119, 146, 177 and 270 days. The seeds were harvested under experimental conditions in Marechal Candido Rondon, Paraná, during the 2012/13 growing seasons. Four replicates of 100 seeds each were established for each storage time, and the seeds were evaluated, on paper, based on the BOD under the following experimental temperature conditions: alternating temperatures of 20 and 30°C and a constant temperature of 25°C. The seeds from both treatments were subject to seven-hour photoperiods and 25°C under continuous darkness. The germinated seeds were counted daily for eight days after sowing, and we evaluated the percentages...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.01.03.03-2 Germination test; Temperature; Photoperiod; Seed vigor Produção e Beneficiamento de Sementes.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30989

Caracterização morfofisiológica e identificação molecular de isolados de Guignardia citricarpa, agente patogênico da mancha preta dos citros - DOI: 10.4025/actasciagron.v30i5.5962
Provedor de dados: 1
Autores: Caixeta, Marilda Pereira; UEM; Corazza, Maria Júlia; UEM; Oliveira, Ricardo Ribeiro de; UEM; Zanutto, Carlos Alexandre; UEM; Nunes, William Mário de Carvalho; UEM; Vida, João Batista; UEM.
O presente trabalho teve como objetivo identificar 11 isolados de Guignardia citricarpa, agente causal da mancha preta dos citros (MPC), obtidos de frutas cítricas sintomáticas de diferentes regiões geográficas, por meio da PCR e caracterização morfofisiológica das estruturas propagativas, esporulação e crescimento micelial em diferentes meios de cultura, temperaturas e regimes de luz, nas condições de laboratório.  Pelo teste de PCR, todos os isolados foram identificados como o patógeno G. citricarpa. Os isolados caracterizados foram submetidos às temperaturas de 20, 25 e 30ºC, em regime de luz contínua, escuro contínuo e fotoperíodos de 12 horas, durante 24 dias. Utilizaram-se os meios de cultura aveia-ágar (AA), batata-dextrose-ágar (BDA) e...
Palavras-chave: 5.01.02.00-1 Fitossanidade G. citricarpa; PCR; Esporulação; Crescimento micelial; Temperatura; Meio de cultura; Fotoperíodo. G. citricarpa; PCR; Sporing; Mycelial growth; Temperature; Mean of culture; Photoperiod.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5962

Ovarian radiographic and direct measurements of Japanese Quail ( Coturnix coturnix japonica ) submitted to light restriction
Provedor de dados: 45
Autores: Albuquerque,M.; Guedes,R.; Dornbusch,P.; Laskoski,L.; Mangini,P.; Lange,R.
ABSTRACT Often, in pet birds, any stimulus to lay eggs is unwanted in order to reduce reproductive diseases and disorders. The objectives of this study were: to determine the time necessary to promote ovary involution after an eight hour photoperiod using laying Japanese quails (Coturnix coturnix japonica); to connect the ovarian radiographic measurements with egg production; and to compare these measurements with direct ovary data obtained at necropsy. Birds were separated into three groups: 12h/24d (control group - 12h photoperiod for 24 days), 8h/24d and 8h/36d (8h photoperiod for 24 and 36 days). After euthanasia, all cadavers were x-rayed to measure ovary length and height. Birds were necropsied to measure ovarian length and weight. Results:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avian; Photoperiod; Gonad; Laying; Radiography.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000300651

Survival and growth of Pseudoplatystoma corruscans (Pisces - Pimelodidae) larvae: effect of photoperiod
Provedor de dados: 45
Autores: Campagnolo,R.; Nuñer,A.P.O.
The survival and the growth of Pseudoplatystoma corruscans larvae exposed to four photoperiods: light:dark (LD) 0:24, LD 10:14, LD 14:10, and LD 24:0, in a brackish water (5‰) culture were analyzed. Larvae were fed with Artemia sp. nauplii at a 500 nauplii/larvae/day ratio. Survival on day 5 was inversely related to the length of photoperiod. From days 5 to 10, intermediate photoperiods resulted in a better survival, although LD 0:24 and LD 14:10 resulted in similar survival on day 10. Larvae presented higher weight at intermediate photoperiods. The results suggested that photoperiod requirements shifted during early development of P. corruscans larvae.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Surubim; Pseudoplatystoma corruscans; Larvae; Photoperiod; Survival; Growth.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352008000600030

Effects of abiotic stress on biomass and anthocyanin production in cell cultures of Melastoma malabathricum
Provedor de dados: 48
Autores: CHAN,L. K; KOAY,S. S; BOEY,P. L; BHATT,A.
Plant cell cultures could be used as an important tool for biochemical production, ranging from natural coloring (pigments) to pharmaceutical products. Anthocyanins are becoming a very important alternative to synthetic dyes because of increased public concern over the safety of artificial food coloring agents. Several factors are responsible for the production of anthocynin in cell cultures. In the present study, we investigate the effects of different environmental factors, such as light intensity, irradiance (continuous irradiance or continuous darkness), temperature and medium pH on cell biomass yield and anthocyanin production in cultures of Melastoma malabathricum. Moderate light intensity (301 - 600 lux) induced higher accumulation of anthocyanins...
Tipo: Journal article
Palavras-chave: Irradiance; Medium pH; Photoperiod; Temperature; Melastoma malabathricum.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000100014

Reproductive biology of Artibeus fimbriatus Gray 1838 (Chiroptera) at the southern limit of its geographic range
Provedor de dados: 49
Autores: Lima,Camila S.; Fabián,Marta Elena.
Abstract Bats of the Phyllostomidae family exhibit different reproductive patterns in Neotropical regions and the strategy adopted depends on the regional climate. Here we studied the reproductive biology of Artibeus fimbriatus at the southern limit of their distribution in Brazil. This region has no rainy season, and the climate is characterized by high temperatures and variable photoperiods. We examined 129 A. fimbriatus females over several months, and used histological procedures where necessary in order to determine whether bats were pregnant. Females exhibited a long reproductive period and were pregnant from June until February. The reproduction events were found to be dependent on the photoperiod, but independent of annual accumulated...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Phyllostomidae; Photoperiod; Reproduction; Seasonal.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000400504

Plasticity in the timing of activity in the Red-rumped Agouti, Dasyprocta leporina (Mammalia: Rodentia), in the Atlantic Forest of southeastern Brazil
Provedor de dados: 49
Autores: Magalhães,Laura Martins; Srbek-Araujo,Ana Carolina.
Abstract Timing of activity is a consequence of adaptations to daily and seasonal changes in the environment and examining these patterns is important to better understand the temporal niches of the species. Here we examine temporal activity in the Red-rumped Agouti (Dasyprocta leporina) in two fragments of Atlantic Forest and those factors that influence the circadian rhythm in the study areas. Camera traps were used to gather data in two protected areas (one montane and other coastal) in the state of Espírito Santo, southeastern Brazil. A total of 49 photos were taken in the mountains and 152 in the coastal area. Activity patterns were diurnal and bimodal, and animals were active for 14-15 hours each day. Activity peaked in the morning soon after sunrise...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dasyproctidae; Abiotic factors; Activity patterns; Circadian rhythm; Photoperiod.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000200204

Role of Light and Dark Cycle and Different Temperatures in the Regulation of Growth and Protein Expression in Oscillatoria agardhii Strain
Provedor de dados: 52
Autores: Dautania,Gajendra Kumar; Singh,Gajendra Pal.
The cyanobacterium Oscillatoria agardhii was isolated from the fresh water Mawatha lake, Jaipur and was grown in Zarrouk's medium at 25 ± 2°C, illuminated with white fluorescent light at the intensity of 2 500 lux with 12:12 h light and dark photoperiod. The effects of photoperiod and temperature on the growth and protein expression by Oscillatoria agardhii were studied under different controlled culture conditions (ALR, ALC, CLR, CLC, and NDL), measuring optical density, cell count and dry weight. Protein content was measured quantitatively by Bradford assay and qualitatively by SDS-PAGE. The densitometric analysis was also carried out for the measurement of the expression level of different proteins/peptides under different culture conditions. Maximum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bradford assay; Densitometer; Oscillatoria agardhii; Photoperiod; SDS-PAGE.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000600933

Growth and survival of dorado Salminus brasiliensis (Pisces, Characidae) post-larvae cultivated with different types of food and photoperiods
Provedor de dados: 52
Autores: Schütz,Jackson Haroldo; Nuñer,Alex Pires de Oliveira.
The effect of food and photoperiod on dorado (Salminus brasiliensis) post-larvae growth and survival was investigated using the following treatments: LD (Light: Dark) 24:0 + Artemia nauplii (A), LD 24:0 + fish prey (F), LD 14:10 + A, LD 14:10 + F, LD 0:24 +A and LD 0:24 + F. Prochilodus lineatus larvae were used as fish prey. Higher survival rates were registered in fish prey treatments (P&lt;0.05) and were not influenced by photoperiod whereas in Artemia treatments, the survival was very low, but directly proportional to light increase (P&lt;0.05). The better growth in LD 0:24 was related to a safe-energy strategy that reduced energy consumption whereas in LD 24:0, the higher energy consumption reduced the growth. In intermediate photoperiod, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dorado; Food type; Larviculture; Photoperiod; Salminus brasiliensis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000300010

Photoperiod influence on the cultivation of Steindachneridion scriptum (Pisces, Pimelodidae) juvenile
Provedor de dados: 52
Autores: Zaniboni-Filho,Evoy; Reynalte-Tataje,David; Nuñer,Alex Pires de Oliveira; Meurer,Samira.
This study aimed to evaluate the influence of photoperiod on juvenile suruvi (Steindachneridion scriptum) in six photoperiods: 24L-0D (L= Light; D= Dark), 18L-6D, 14L-10D, 10L-14D, 6L-18D and 0L-24D. Juveniles measuring 176.8 ± 13.2mm and weighing 60.2 ± 16.0g were distributed in eighteen 150-L aquariums, stocked with 8 juveniles per aquarium. At the end of the study, treatments 24L-0D (105.7 ± 5.8g and 845.9 ±46g) and 0L-24D (93.3 ± 4.9g and 746.4 ± 39.5g) were different (P&lt;0.05) on weight and biomass. Survival (100 ± 0.0%) and length (212.5 ±2.5mm) were the same (P&gt;0.05) in all the treatments. The results showed that suruvi (Steindachneridion scriptum) reached better weight and biomass in extended light periods.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Steindachneridion scriptum; Larviculture; Photoperiod; Growth.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000300016

Probable effect of photoperiod on seasonal variation in the nuclear volume of the adrenal cortex of viscacha (Lagostomus maximus maximus)
Provedor de dados: 56
Autores: Ribes,A.C.; Mohamed,F.; Dominguez,S.; Delgado,M.; Scardapane,L.; Guzman,J.; Piezzi,R.
The neuroendocrine system regulates several organic functions such as reproduction, metabolism and adaptation to the environment. This system shows seasonal changes linked to the environment. The experimental model used in the present study was Lagostomus maximus maximus (viscacha). The reproduction of males of this species is photoperiod dependent. Twenty-four adult male viscachas were captured in their habitat at different times during one year. The adrenal glands were processed for light microscopy. Serial cuts were stained with hematoxylin-eosin for the morphometric study, and 100 nuclei of each zone of the adrenal cortex were counted per animal. Data were analyzed statistically by ANOVA and the Tukey test. The cells of the glomerulosa zone are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Viscacha (Lagostomus maximus maximus); Adrenal; Glomerulosa; Fasciculata; Reticularis; Photoperiod; Morphometry; Melatonin.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000900010

Utility of basic research in plant/crop physiology in relation to crop improvement: a review and a personal account
Provedor de dados: 61
Autores: El-Sharkawy,Mabrouk A.
Agricultural research and development plays an essential role in a nation's economic development, providing for food security for an ever-increasing population. In developed countries, the gap between potential and actual yield is largely closed because of a combination of advanced technologies, high-yielding new varieties and the application of agrochemicals in highly mechanized production systems. In most of these countries, agricultural production exceeds national demand, resulting in excess products for export. In many of the developing countries, however, agricultural productivity is still far below what it should be because of multiple technical and socio-economic constraints. Food deficits are the norm in poor and middle-income countries, requiring...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agriculture; Breeding; C4-photosynthesis; Drought-tolerance; Ecophysiology; Ecosystems; Hormones; Photoperiod; Productivity; Soil; Water stress.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000400001

Identifying Eucalyptus expressed sequence tags related to Arabidopsis flowering-time pathway genes
Provedor de dados: 61
Autores: Dornelas,Marcelo Carnier; Rodriguez,Adriana Pinheiro Martinelli.
Flowering initiation depends on the balanced expression of a complex network of genes that is regulated by both endogenous and environmental factors. The timing of the initiation of flowering is crucial for the reproductive success of plants; therefore, they have developed conserved molecular mechanisms to integrate both environmental and endogenous cues to regulate flowering time precisely. Extensive advances in plant biology are possible now that the complete genome sequences of flowering plants is available and plant genomes can be comprehensively compared. Thus, association studies are emerging as powerful tools for the functional identification of genes involved on the regulation of flowering pathways. In this paper we report the results of our search...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CONSTANS; Data mining; EST; Photoperiod; Vernalization.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000200009

Environmental physiology of the bananas (Musa spp.)
Provedor de dados: 61
Autores: 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

Intermittent lighting programs for layers with different photophases in the beginning of the laying phase
Provedor de dados: 65
Autores: Yuri,Flavio Manabu; Souza,Cleverson de; Schneider,Aline Felix; Gewehr,Clóvis Eliseu.
ABSTRACT: It was possible to evaluate the effect of continuous and intermittent lighting programs with different photophases on the performance and eggs quality of laying hens, applied to the beginning of the laying phase. The authors used 420 Hy-line Brown laying hens with 21 weeks of age, bred on bedding and submitted for six periods of 28 days between the solstice of summer and winter. The three lighting programs were: (PIC) 16 hours of continuos light, intermittent program with initial and final photophases of 15 minutes (PII15) and an intermittent program with initial and final photophases of 30 minutes (PII30). A completely randomized design with ten repetitions of 14 birds was used. The mean values were subjected analysis of variance and analyzed by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scotoperiod; Photophase; Photoperiod; Hens.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016001102012