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dc.contributor.authorPinton, Rachel
dc.date.accessioned2023-12-22T01:41:24Z-
dc.date.available2023-12-22T01:41:24Z-
dc.date.issued2007-03-30
dc.identifier.citationPinton, Rachel. “Quorum sensing” e biofilme como estratégias para a seleção de Pseudomonas sp. promotoras de crescimento. 2007. [47 f.]. Dissertação( Programa de Pós-Graduação em Agronomia - Ciência do Solo) - Universidade Federal Rural do Rio de Janeiro, [Seropédica - RJ] .por
dc.identifier.urihttps://rima.ufrrj.br/jspui/handle/20.500.14407/10702-
dc.description.abstractDevido à necessidade de se desenvolver metodologias de manejo de sistemas agrícolas que venham a gerar menor impacto negativo ao ambiente, a pesquisa vem buscando utilizar componentes biológicos dos agroecossistemas para a obtenção de maior produtividade e sustentabilidade. Neste sentido, desenvolveu-se o presente trabalho, que objetivou prospectar rizobactérias com possibilidade de promover crescimento em plantas, bem como parâmetros para sua seleção. Foram obtidos 127 isolados do rizoplano de plantas de alface, couve, rúcula e salsa, cultivados em meio King B modificado para Pseudomonas e foi realizada sua caracterização morfológica. Foram realizados ensaios para verificar a produção de AHL (acil homoserina lactona), auto-indutor presente em sistemas de “quorum sensing” de bactérias gram-negativas, com Agrobacterium tumefaciens repórter. De 112 isolados testados, 14 (12,5%) foram positivos para produção de AHL. De 91 isolados avaliados, 87 (95,5%) foram capazes de formar biofilme. Para verificar capacidade das rizobactérias em promover crescimento de plantas foram conduzidos três experimentos com plantas de couve. No experimento I foram testados: 2 isolados, 5 doses de inoculo e quatro formas de inoculação. A coleta ocorreu aos 30 dia s após a montagem do experimento e foram avaliados os seguintes parâmetros: massa fresca da parte aérea; massa seca da parte aérea e massa seca das raízes. Não houve diferença entre os isolados, entretanto houve diferença na forma de inoculação, sendo a inoculação nas plântulas mais eficiente do que nas sementes. No experimento II foram utilizados 7 isolados, 2 concentrações de inoculo e 1 época de inoculação (aos 10 dias após o plantio). As parcelas constituíram-se de vasos plásticos com 1 kg de substrato (horizonte A de Planossolo), assim como no experimento I. A coleta foi realizada aos 55 dias após o plantio e os parâmetros avaliados foram: massa fresca da parte aérea, massa seca da parte aérea e massa seca das raízes. A estirpe R142 promoveu 40% de aumento na massa seca da parte aérea e 55% de aumento na massa seca das raízes. No experimento III, foram utilizados os mesmos 7 isolados do II, 2 concentrações de inoculo e 2 épocas de inoculação. As parcelas foram estabelecidas em bandejas de isopor e o substrato PLANTMAX (EUCATEX). A coleta foi aos 24 dias após o plantio e não houve diferença entre as bactérias, entretanto houve entre doses e época, sendo a dose 10 9 melhor do que 10 7, e a inoculação aos 6 dias após o plantio foi melhor do que aos 12 dias após o plantio. Com os resultados obtidos, pode-se concluir que o isolado R142 foi eficiente em promover crescimento em couve, a dose de inoculo mais apropriada foi 10 9 e a inoculação deve ser realizada nas plântulas.por
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq, Brasilpor
dc.formatapplication/pdf*
dc.languageporpor
dc.publisherUniversidade Federal Rural do Rio de Janeiropor
dc.rightsAcesso Abertopor
dc.subjectAuto- indutorespor
dc.subjectRizobactériaspor
dc.subjectPromoção de crescimentopor
dc.subjectCouvepor
dc.subjectAutoinducerseng
dc.subjectRhizobacteriaeng
dc.subjectGrowth promotioneng
dc.subjectKaleeng
dc.title“Quorum sensing” e biofilme como estratégias para a seleção de Pseudomonas sp. promotoras de crescimentopor
dc.title.alternative“Quorum sensing” and biofilm as strategies for selecting growth promoters Pseudomonas sp.eng
dc.typeDissertaçãopor
dc.description.abstractOtherDue to the need of developing agricultural management practices that could bring lower environmental negative impacts, researches have been investigating biological components of agro ecosystems in order to reach higher productivity and sustainability. Therefore, the present study was conducted with the purpose of prospecting plant growth promotion rhizobacteria and parameters for their selection. There were isolated 127 strains of rhizobacteria from rhizoplane of lettuce, kale, arugula and parsley. The plants were cultivated in King B media, modified for Pseudomonas, and its morphological characterization was made. There were set assays to detect ALH (acil homoserina lactone) production, an auto inducer present in “quorum sensing” systems of gram- negative bacteria, with Agrobacterium tumefaciens. Among the 112 strains evaluated, 14 (12.5%) resulted positive for AHL production. From the 91 strains evaluated for biofilm formation, 87 (95.5%) showed positive. Three experiments were conducted using kale to verify the rhizobacteria capacity in promoting plant growth. In the first experiment, there were tested: 2 isolated strains, 5 inoculate doses, and 4 inoculation methods. After 30 days, the material was collected and the following parameters were evaluated: shoot fresh weight; shoot dry weight, and root dry weight. There was no difference between strains; however, there was difference among the inoculation methods, with better results when seedlings received inoculate than in the seeds. In the second experiment, 7 strains were used; with 2 inoculate concentrations, and one moment of inoculation, at the 10th day after planting. The treatments for both experiments were placed in vases with 1kg of substrate (soil from A horizon of a Fragiudult). After 55 days the plants were collected and the following parameters evaluated: shoot fresh weight, shoot dry weight, and root dry weight. The plants inoculated with R142 strain showed increment of 40% in shoot fresh weight, and 55% in root dry weight. In the third experiment, the same 7 strains used in the second assay were inoculated; with 2 inoculate concentrations, and 2 inoculation periods. The parcels were set in Styrofoam containers for plants with the substrate PLANTMAX (EUCATEX). The plants were collected 24 days after planting and there was no difference between strains, but there were differences among inoculate concentration (10 9 was better than 10 7), and the results were better when inoculated at the 6th day than at the 12th. The obtained data allow us to conclude that the R142 strain was efficient in promoting growth in kale, the inoculate dosage 10 9 was most appropriated, and the inoculation must be performed on seedlings.eng
dc.contributor.advisor1Xavier, Gustavo Ribeiro
dc.contributor.advisor1ID032488987-98por
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/6832519607059036por
dc.contributor.referee1Ferreira, Enderson Petrônio de Brito
dc.contributor.referee2Souza, Sonia Regina de
dc.creator.ID028440627-92por
dc.publisher.countryBrasilpor
dc.publisher.departmentInstituto de Agronomiapor
dc.publisher.initialsUFRRJpor
dc.publisher.programPrograma de Pós-Graduação em Agronomia - Ciência do Solopor
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dc.subject.cnpqAgronomiapor
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dc.originais.urihttps://tede.ufrrj.br/jspui/handle/jspui/4188
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