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| Nepomuceno,Alexandre Lima; Oosterhuis,Derrick; Stewart,James McD; Turley,Rickie; Neumaier,Norman; Farias,José Renato Bouças. |
| Tolerance to drought in plants is not a simple trait, but a complex of mechanisms working in combination to avoid or to resist water deficit. Genotypes that differ in tolerance to water deficit may show qualitative and quantitative differences in gene expression when submitted to drought periods. Four cotton (Gossypium hirsutum L.) genotypes (Siokra L-23, Stoneville 506, CS 50 and T-1521) with contrasting responses to water deficit stress were studied using the Differential Display (DD) technique to identify and isolate genes which may differ among them. Fifty-two cDNA fragments differentially expressed during water deficit were isolated, cloned and sequenced. Search of gene bank databases showed that two cDNA clones, A12B15-6 and A12B13-1, have high... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calmodulin; Drought; Gene expression; Gossypium hirsutum L.; Trehalase. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000100002 |
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| Rakocevic,Miroslava; Neumaier,Norman; Oliveira,Gustavo Migliorini de; Nepomuceno,Alexandre Lima; Farias,José Renato Bouças. |
| The objectives of this work were to determine the heliotropic movements of the upper trifoliates for two soybean cultivars, BR 16 and Embrapa 48, during a daily cycle, in three phenological stages and two water regimes, and to estimate the impact of irrigation and daily leaflet movements on agronomic characteristics and grain yield. Heliotropic movements were studied in three phenological stages: V4-V6, V7-V10, and R5 in irrigated and non-irrigated plots. For each stage, the leaflet elevation and azimuth were measured hourly. Under a low (V4-V6 stage) and mid (V7-V10 stage) leaf area index (LAI) the diaheliotropism was slightly more frequent and intensive in non-irrigated than in irrigated plants, only at early morning and late afternoon hours. At R5 stage... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Diaheliotropism; Irrigation; Leaf area index; Paraheliotropism. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000700005 |
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| Souza,Paulo Jorge de Oliveira Ponte de; Ribeiro,Aristides; Rocha,Edson José Paulino da; Farias,José Renato Bouças; Souza,Everaldo Barreiros de. |
| Neste trabalho, avaliou-se o balanço de energia na cultura soja (Glycine max (L.) Merrill), variedade Tracajá, durante a safra e entressafra, em uma área de avanço de fronteira agrícola na Amazônia, por meio do método da razão de Bowen. Durante quase todo o ciclo da cultura, maior parte da energia foi consumida na forma de calor latente, principalmente durante as fases de florescimento e frutificação. Tal característica esteve relacionada à elevada condutância estomática foliar da soja e à disponibilidade de água na região. Próximo ao fim do ciclo ocorreu uma inversão na partição de energia entre os componentes H e LE, quando maior parte da energia foi usada no aquecimento do ar (79% do saldo de radiação). Durante a entressafra observou-se a redução de 75%... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fronteira agrícola; Razão de Bowen; Partição de energia. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000400013 |
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| Souza,Paulo Jorge de Oliveira Ponte de; Farias,José Renato Bouças; Abreu,José Paulo Mourão de Melo e; Ribeiro,Aristides; Rocha,Edson José Paulino da; Botelho,Marcel do Nascimento; Sousa,Adriano Marlisom Leão de. |
| The objective of this work was to parameterize, calibrate, and validate a new version of the soybean growth and yield model developed by Sinclair, under natural field conditions in northeastern Amazon. The meteorological data and the values of soybean growth and leaf area were obtained from an agrometeorological experiment carried out in Paragominas, PA, Brazil, from 2006 to 2009. The climatic conditions during the experiment were very distinct, with a slight reduction in rainfall in 2007, due to the El Niño phenomenon. There was a reduction in the leaf area index (LAI) and in biomass production during this year, which was reproduced by the model. The simulation of the LAI had root mean square error (RMSE) of 0.55 to 0.82 m² m-2, from 2006 to 2009. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Amazon region; Climate models; Leaf area index; Soybean crop expansion; Yield simulation. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000600001 |
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| Assad,Eduardo Delgado; Marin,Fábio Ricardo; Evangelista,Silvio Roberto; Pilau,Felipe Gustavo; Farias,José Renato Bouças; Pinto,Hilton Silveira; Zullo Júnior,Jurandir. |
| Este trabalho teve por objetivo avaliar um sistema de previsão de safra de soja para o Brasil, baseado em modelos empíricos regionalizados para estimativa da produtividade, a partir de um banco de dados de área cultivada em escala municipal, e de um sistema de monitoramento agrometeorológico de abrangência nacional. Os modelos incorporam a base conceitual proposta por Doorenbos & Kassam, com ajustes empíricos para cada região do Brasil, considerando-se as diferenças quanto ao potencial produtivo das principais variedades e as peculiaridades dos sistemas de produção utilizados nas diferentes regiões. A base de informações de área cultivada de cada Estado foi constituída por dados provenientes do IBGE e da Conab. A produção de soja, entre as safras... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Produtividade; Modelagem; Tecnologia da informação; Agrometeorologia. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000500002 |
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| Rodrigues,Fabiana Aparecida; Marcolino-Gomes,Juliana; Carvalho,Josirlei de Fátima Corrêa; Nascimento,Leandro Costa do; Neumaier,Norman; Farias,José Renato Bouças; Carazzolle,Marcelo Falsarella; Marcelino,Francismar Corrêa; Nepomuceno,Alexandre Lima. |
| Soybean has a wide range of applications in the industry and, due to its crop potential, its improvement is widely desirable. During drought conditions, soybean crops suffer significant losses in productivity. Therefore, understanding the responses of the soybean under this stress is an effective way of targeting crop improvement techniques. In this study, we employed the Suppressive Subtractive Hybridization (SSH) technique to investigate differentially expressed genes under water deficit conditions. Embrapa 48 and BR 16 soybean lines, known as drought-tolerant and -sensitive, respectively, were grown hydroponically and subjected to different short-term periods of stress by withholding the nutrient solution. Using this approach, we have identified genes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gene expression; Drought; Transcriptome. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000200011 |
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| Almeida,Álvaro Manuel Rodrigues; Saraiva,Odilon Ferreira; Farias,José Renato Bouças; Gaudêncio,Celso Almeida; Torres,Eleno. |
| A study was conducted in the subtropical area of Southern Brazil to determine the survival of pathogens in soybean residues under conventional and no-tillage cultivation systems from March to September of 1998 and 1999. The pathogens most frequently isolated were Colletotrichum truncatum, Phomopsis spp., Cercospora kikuchii, Fusarium spp., Macrophomina phaseolina, and Rhizoctonia solani. Other fungi isolated were Myrothecium roridum, Penicillium sp., Chaetomium sp., Epicoccum sp., Corynespora cassiicola and Trichoderma sp. The percent of survival of each pathogen varied according to the month and the year. Survival of C. truncatum, Phomopsis spp. and C. kikuchii were significantly reduced (p<0.05) from the first to the last evaluation either on buried... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cultivation; Crop residues; Degradation; Biomass; Plant diseases. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001001000003 |
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