Práticas de controle da ferrugem da videira por fontes de resistência avaliadas em casa-de-vegetação.

Suplemento. Edição dos Resumos do 44 Congresso Brasileiro de Fitopatologia, Bento Gonçalves, ago. 2011

Aparência, compostos fenólicos e enzimas oxidativas em uva `Itália` sob influencia do cálcio e do armazenamento refrigerado.

O objetivo deste trabalho foi determinar o efeito da aplicacao pre-colheita de calcio na aparencia (secamento do engaco, danos mecanicos e podridoes), teor de fenolicos e enzimas oxidativas (polifenoloxidase e peroxidase) em uva. Os cachos de uca Italia de um cultivo comercial em Petrolina, Pernambuco, Brasil, foram marcados e imersos por 10 segundos, em solucoes de Ca a 0 e 1,5%, na forma de cloreto de calcio, aos 57 dias apos o inicio da formacao dos frutos (quando as bagas comecaram a mudar de cor e amolecer). Apos a colheita, os frutos foram armazenados a 3,5 mai ou menos 0,2oC e 93 mais ou menos 6% UR e avaliados aos 0; 14; 28; 42; 56 e 70 dias. Houve um incremento no secamento do engraco, no aparecimento de sintomas de danos mecanicos e de podridoes nas bags com o tempo de armazenamento. A aplicacao de calcio reduziu a atividade de polifenoloxidase e, consequentemente, os sintomas de danos mecanicos, resultando numa melhor aparencia. A vida util das uvas foi de aproximadamente 56 dias, quando sintomas de senescencia, podridoes e o nivel dos sintomas de danos mecanicos comecaram a aumentar de forma significativa

Compostagem de resíduos de hortifruti para produção de biofertilizante.

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Qualidade de frutos de macieiras Eva e Princesa sob fertirrigação nitrogenada em Petrolina-PE.

O presente trabalho foi desenvolvido com o objetivo de avaliar a qualidade física e química de frutos das macieiras Eva e Princesa, em função a fertirrigação nitrogenada em Petrolina-PE

Animal production from new Panicum maximum genotypes in the Amazon biome, Brazil.

The Panicum maximum breeding program coordinated by the Brazilian Agricultural Research Corporation (Embrapa) has been evaluating and selecting genotypes under different soil and climatic conditions, with the objective to release new cultivars adapted to the diverse regions of Brazil. For the Amazon biome, small-plot experiments carried out in Acre between 2003 and 2005 allowed the selection of some promising genotypes (Valentim and Andrade 2005; Valentim et al. 2006; Andrade and Valentim 2009), with higher potential for forage growth than cultivars on the market. The objective of this work was to compare 2 new P. maximum genotypes with cv. Tanzânia in relation to carrying capacity and animal performance, when managed under rotational stocking in the Amazon biome

Hematologic and hepatic responses of the freshwater fish Hoplias malabaricus after saxitoxin exposure.

The bioaccumulation of saxitoxins (STX) in the trophic chain, mainly in freshwater, are not completely known. This work aimed to elucidate the effects of STX on Hoplias malabaricus through trophic bioassay. The fish were fed once every five days with Astyanax sp. before being subjected to an intraperitoneal inoculation with the lysate of Cylindrospermopsis raciborskii culture containing 97% STX and 3% by neosaxitoxin and gonyautoxin during 20 days. The animal?s liver was assessed using biomarkers as activities of superoxide dismutase (SOD), catalase (CAT), glutathione S-transferase (GST), and glutathione peroxidase (GPx), and concentrations of reduced glutathione (GSH) and lipoperoxidation (LPO) and protein carbonylation (PCO). In the blood was analyzed the genotoxic and hematological parameters. The hepatosomatic index and the relative condition factor did not show a significant difference between the exposed and control groups. The values of mean corpuscular hemoglobin concentration and mean corpuscular hemoglobin increased in the STX group. The hepatic tissue from both groups exhibited a typical pattern that have been already described for most teleost fish. The results suggested the generation of reactive oxygen species, with increased activity of GPx and concentrations of LPO and GSH; whereas the specific activity of SOD decreased. However, no changes were observed in the CAT, PCO, and DNA damage. Although the STX effects are known as neurotoxic, this cyanotoxin caused liver biochemical alterations that can be considered ecologically relevant

Animal production from new Panicum maximum genotypes in the Amazon biome, Brazil.

The Panicum maximum breeding program coordinated by the Brazilian Agricultural Research Corporation (Embrapa) has been evaluating and selecting genotypes under different soil and climatic conditions, with the objective to release new cultivars adapted to the diverse regions of Brazil. For the Amazon biome, small-plot experiments carried out in Acre between 2003 and 2005 allowed the selection of some promising genotypes (Valentim and Andrade 2005; Valentim et al. 2006; Andrade and Valentim 2009), with higher potential for forage growth than cultivars on the market. The objec-tive of this work was to compare 2 new P. maximum genotypes with cv. Tanzânia in relation to carrying ca-pacity and animal performance, when managed under rotational stocking in the Amazon biome.Publicado também nos Anais do 22º INTERNATIONAL GRASSLAND CONGRESS, Sidney, 2013