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      Application of the antibiotic disk diffusion method to multivariate profiling of soil bacterial community: comparing the power to discriminate different soils and dimension of the discrimination with that of the Biolog method Translated title: Aplicação do método de difusão de disco de antibiótico para traçar o perfil da comunidade bacteriana no solo: comparação de seu poder discriminatório e dimensão da discriminação em relação ao método Biolog

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          Abstract

          The antibiotic disk diffution (ADD) method was compared with the Biolog method in terms of power to discriminate soils and dimension of the discrimination. Soils from a forest and a citrus field in Thailand were profiled with these methods. These methods differentiated the soils in the principal component score plots. Then, Wilk's lambda statistic was determined to estimate power of these methods to discriminate the soils. The ADD method scored Wilk's lambda of 0.003 (p = 0.144) and 0.000 (p=0.020), for direct and ratio-transformed calculation, respectively. The Biolog method recorded Wilk's lambda of 0.001 (p=0.067), 0.003 (p=0.144) and 0.035 (p=0.440), at 0.25, 0.50 and 0.75 average well color developments (AWCDs), respectively. The ADD method showed high discrimination power, or at least comparable to that of the Biolog method. Redundancy analysis (RDA) resulted in ordination diagrams, which revealed a difference in dimension of the soil discrimination among the methods and the AWCDs. The soil environmental factors significantly related to the bacterial profiles at p=0.05 were: available phosphorus (ADD method and Biolog 0.25 AWCD), and pH (Biolog 0.50 and 0.75 AWCD). These results indicated that the profiling methods and the AWCDs revealed the multidimensionality of the discrimination. The possibility of the application of the ADD method to extraction of such pieces of information for effective land management was suggested.

          Translated abstract

          O método de Difusão de Disco de Antibiótico (ADD) foi comparado ao método Biolog quanto ao seu poder de discriminar solos e quanto à dimensão da discriminação, analisando-se os solos de uma floresta e de um campo de cítricos na Tailândia. A diferenciação dos solos por esses métodos foi feita de acordo com o score plot do componente principal.Em seguida, determinou-se o valor de lambda de Wilk para estimar o poder discriminatório desses métodos. O método ADD resultou em lambda de Wilk de 0,003 (p=0,144) e 0,035 (p=0,440) para os valores diretos e transformados, respectivamente. Enquanto o método Biolog resultou em valores de lambda de Wilk de 0,001 (p=0,067), 0,003 (p=0,144) e 0,035 (p=0,440) para os valores médios de desenvolvimento de cor (AWCDs) 0,25, 0,50 e 0,75 respectivamente, o método ADD apresentou poder discriminatório elevado, ou, no mínimo semelhante ao do método Biolog. A análise de redundância resultou em diagramas que revelaram uma diferença na dimensão da discriminação entre os métodos e os valores de AWCD. Os fatores ambientais do solo que estiveram significativamente relacionados com os perfis bacterianos (p=0,0) foram: fósforo disponível (método ADD e Biolog 0,25 AWCD) e pH (Biolog 0,50 e 0,75 AWCD). Esses resultados indicaram que os dois métodos e as AWCDs revelaram a multidimensionalidade da discriminação. A aplicação do método ADD para obtenção dessas informações para um gerenciamento eficiente do solo foi sugerida.

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          Most cited references28

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          Functional diversity of microbial communities: A quantitative approach

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            Classification and characterization of heterotrophic microbial communities on the basis of patterns of community-level sole-carbon-source utilization.

            The BLOLOG redox technology based on tetrazolium dye reduction as an indicator of sole-carbon-source utilization was evaluated as a rapid, community-level method to characterize and classify heterotrophic microbial communities. Direct incubation of whole environmental samples (aquatic, soil, and rhizosphere) in BIOLOG plates containing 95 separate carbon sources produced community-dependent patterns of sole-carbon-source utilization. Principal-component analysis of color responses quantified from digitized images of plates revealed distinctive patterns among microbial habitats and spatial gradients within soil and estuarine sites. Correlation of the original carbon source variables to the principal components gives a functional basis to distinctions among communities. Intensive spatial and temporal analysis of microbial communities with this technique can produce ecologically relevant classifications of heterotrophic microbial communities.
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              Biostatistic alanalysis

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                Author and article information

                Journal
                bjm
                Brazilian Journal of Microbiology
                Braz. J. Microbiol.
                Sociedade Brasileira de Microbiologia (São Paulo, SP, Brazil )
                1517-8382
                1678-4405
                December 2003
                : 34
                : 4
                : 13-320
                Article
                S1517-83822003000400005 S1517-8382(03)03400405
                5d718013-5dd0-4d33-b074-3bf654de6db3

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 22 July 2003
                : 21 October 2003
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 28, Pages: 308
                Product

                SciELO Brazil

                Self URI: Full text available only in PDF format (EN)
                Categories
                Environmental and Soil

                antibiotic,comunidade microbiana no solo,difusão de disco,Biolog,antibiótico,soil microbial community,disk diffusion

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