1,768 research outputs found

    Bacterial selection for biological control of plantdisease: criterion determination and validation.

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    This study aimed to evaluate the biocontrol potential of bacteria isolated from different plant species and soils. The production of compounds related to phytopathogen biocontrol and/or promotion of plant growth in bacterial isolates was evaluated by measuring the production of antimicrobial compounds (ammonia and antibiosis) and hydrolytic enzymes (amylases, lipases, proteases, and chitinases) and phosphate solubilization. Of the 1219 bacterial isolates, 92% produced one or more of the eight compounds evaluated, but only 1% of the isolates produced all the compounds. Proteolytic activity was most frequently observed among the bacterial isolates. Among the compounds which often determine the success of biocontrol, 43% produced compounds which inhibit mycelial growth of Monilinia fructicola, but only 11% hydrolyzed chitin. Bacteria from different plant species (rhizosphere or phylloplane) exhibited differences in the ability to produce the compounds evaluated. Most bacterial isolates with biocontrol potential were isolated from rhizospheric soil. The most ef?cient bacteria (producing at least ?ve compounds related to phytopathogen biocontrol and/or plant growth), 86 in total, were evaluated for their biocontrol potential by observing their ability to kill juvenile Mesocriconema xenoplax. Thus, we clearly observed that bacteria that produced more compounds related to phytopathogen biocontrol and/or plant growth had a higher ef?cacy for nematode biocontrol, which validated the selection strategy used

    Produção e composição do leite de ovelhas Santa Inês e mestiças Lacaune e Santa Inês e desenvolvimento de seus cordeiros.

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    Na ovinocultura, a raça Santa Inês, amplamente explorada no território brasileiro, possui índices de produção compatíveis com sistemas europeus de exploração leiteira (Susin et al., 2005), e o bom desempenho de animais na fase de cria está diretamente relacionado com a produção de leite das mães (Peeters et al., 1992). A raça Lacaune tem sua origem atrelada à produção de animais de boa carcaça em diversas regiões da França e passou por um programa de melhoramento genético que resultou em aumento da produção de leite e melhora da composição da carcaça dos cordeiros destinados ao abate (Barillet et al., 2001). O presente trabalho teve o objetivo de avaliar a produção e a composição do leite de três genótipos de ovelhas Santa Inês, ½ Lacaune x ½ Santa Inês e ¾ Lacaune x ¼ Santa Inês ? e o desenvolvimento de seus cordeiros durante os quatro primeiros meses de lactação

    Information engineering: contributions to digital agriculture.

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    Introduction. Knowledge organization and representation systems: Agroterms: controlled vocabulary at Embrapa. Research data management: Dataverse platform; Metadata on the Dataverse platform: the experience of Embrapa Digital Agriculture; Data cataloging on the Dataverse platform. Data quality; Measures for evaluating data quality; Data quality management; Critical success factors for implementing Data quality management. Final considerations

    Knock-down of heat-shock protein 90 and isocitrate lyase gene expression reduced root-knot nematode reproduction.

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