Potencial de utilização de extrato padronizado de Ruta graveolens como agente inibidor de Magnaporthe oryzae.

O objetivo foi avaliar o potencial do extrato vegetal líquido padronizado de Ruta graveolens no controle da brusone

Padronização do extrato de Ruta graveolens L. e avaliação da sua atividade em Magnaporthe oryzae.

O objetivo deste estudo foi padronizar o extrato vegetal líquido de R. graveolens L. e avaliar seu potencial para o controle da brusone em arroz.Apresentação oral - Pós-graduação

Recomendação de inoculante para cultura de milho utilizando a bactéria Herbaspirillum seropedicae, estirpe BR11417

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Tolerance of Coffea arabica L. seeds to sub zero temperatures.

Preservation of the quality of coffee seeds is hindered by their intermediate behavior in storage. However, long-term storage at sub zero temperatures may be achieved by adjusting the water content of the seeds. The aim of this study was to evaluate the tolerance of coffee seeds to freezing, in relation to physiological and enzymatic modifications. Coffee seeds were dried in two manners, rapid and slow, to water contents of interest, 0.67, 0.43, 0.25, 0.18, 0.11, and 0.05 g H2O g-¹ dw (dry basis). After drying, the seeds were stored at a temperature of -20 ºC and of 86 ºC for 24 hours and for 12 months, and then compared to seeds in cold storage at 10 ºC. The seeds were evaluated through calculation of percentage of normal seedlings, percentage of seedlings with expanded cotyledonary leaves, dry matter of roots and of hypocotyls, and viability of embryos in the tetrazolium test. Expression of the enzymes superoxide dismutase, catalase, and peroxidase were evaluated by means of electrophoretic analysis. Only seeds dried more slowly to 0.18 g H2O g-1 dw present relative tolerance to storing at -20 °C for 12 months. Coffee seeds do not tolerate storage at a temperature of -86 ºC for 12 months. Water contents below 0.11g H2O g-¹ dw and above 0.43 g H2O g-¹ dw hurt the physiological quality of coffee seeds, regardless of the type of drying, temperature, and storage period. Coffee seed embryos are more tolerant to desiccation and to freezing compared to whole seeds, especially when the seeds are dried to 0.05 g H2O g-¹ dw. The catalase enzyme can be used as a biochemical marker to study tolerance to freezing in coffee seeds.Título em português: Tolerância de sementes de Coffea arabica L. à temperaturas sub zero

Estimativa e mapeamento das normais anuais de umidade relativa do ar no Estado da Paraiba.

Esse trabalho tem como objetivo a obtenção de uma equação de estimativa da umidade relativa do ar, através de dados existentes desse parâmetro e do balanço hídrico climático e o mapeamento na Paraíba, visando a utilização em estudos bioclimáticos