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Registro Completo |
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
05/11/2013 |
Data da última atualização: |
02/03/2015 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
RACHID, C. T. C. C.; BALIEIRO, F. de C.; PEIXOTO, R. S.; PINHEIRO, Y, A. S.; PICOLLO, M. C.; CHAER, G. M. |
Afiliação: |
FABIANO DE CARVALHO BALIEIRO, CNPS; GUILHERME MONTANDON CHAER, CNPAB. |
Título: |
Mixed plantations can promote microbial integration and soil nitrate increases with changes in the N cycling genes. |
Ano de publicação: |
2013 |
Fonte/Imprenta: |
Soil Biology & Biochemistry, v. 66, p. 146-153, 2013. |
Idioma: |
Português |
Conteúdo: |
Mixed-species plantations of Eucalyptus and legume trees can symbiotically fix nitrogen and potentially improve the soil quality and biomass productivity compared with a conventional Eucalyptus monoculture. In this study, we evaluated changes in the structure and abundance of different microbial groups and nitrogen cycle genes in mixed and pure plantations of Acacia mangium and Eucalyptus urograndis in an experimental area in southeastern Brazil. Soil samples (0e10 cm) collected in two- and three-year-old stands were submitted to chemical characterization and molecular analyses using DGGE and real time- PCR for bacteria (16S rRNA), fungi (ITS), and genes involved in nitrogen cycling (nirK, amoA, nifH). The mixed plantation did not significantly change general soil fertility or total soil C and N content compared with the Eucalyptus monoculture. However, there was a significant increase in available phosphorus and soil nitrate content in both the A. mangium and mixed-species treatments. The multivariate ordination of the DGGE profiles of bacteria, fungi and archaea groups showed distinct community structures in each treatment. Significant differences in the abundance of copies of the target genes were found for fungi, with higher values in the Eucalyptus followed by the mixed and A. mangium plantations. The analysis of nitrogen cycle genes showed no clear difference in the communities of nitrogen fixing bacteria or nitrifying archaea among treatments. The nitrification activity was dominated by archaea because it was not possible to detect the presence of bacterial nitrifiers; the denitrifier community had a distinct profile in the Eucalyptus monoculture. The abundance of archaeal amoA and nirK genes suggests that the A. mangium treatment had higher nitrification and lower denitrification than the other treatments, which would explain the higher soil nitrate levels found in pure A. mangium treatments. Our data suggest that mixed plantations of E. urograndis and A. mangium result in a distinct microbial community relative to the respective monocultures with positive effects on soil phosphorus and nitrate content, which potentially reduces the need for anthropogenic fertilization. MenosMixed-species plantations of Eucalyptus and legume trees can symbiotically fix nitrogen and potentially improve the soil quality and biomass productivity compared with a conventional Eucalyptus monoculture. In this study, we evaluated changes in the structure and abundance of different microbial groups and nitrogen cycle genes in mixed and pure plantations of Acacia mangium and Eucalyptus urograndis in an experimental area in southeastern Brazil. Soil samples (0e10 cm) collected in two- and three-year-old stands were submitted to chemical characterization and molecular analyses using DGGE and real time- PCR for bacteria (16S rRNA), fungi (ITS), and genes involved in nitrogen cycling (nirK, amoA, nifH). The mixed plantation did not significantly change general soil fertility or total soil C and N content compared with the Eucalyptus monoculture. However, there was a significant increase in available phosphorus and soil nitrate content in both the A. mangium and mixed-species treatments. The multivariate ordination of the DGGE profiles of bacteria, fungi and archaea groups showed distinct community structures in each treatment. Significant differences in the abundance of copies of the target genes were found for fungi, with higher values in the Eucalyptus followed by the mixed and A. mangium plantations. The analysis of nitrogen cycle genes showed no clear difference in the communities of nitrogen fixing bacteria or nitrifying archaea among treatments. The nitrification activi... Mostrar Tudo |
Palavras-Chave: |
Forest microbiology; Microbial diversity; Mixed plantation; N cycling genes. |
Thesaurus Nal: |
Acacia mangium; Eucalyptus. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02970naa a2200253 a 4500 001 1970359 005 2015-03-02 008 2013 bl uuuu u00u1 u #d 100 1 $aRACHID, C. T. C. C. 245 $aMixed plantations can promote microbial integration and soil nitrate increases with changes in the N cycling genes. 260 $c2013 520 $aMixed-species plantations of Eucalyptus and legume trees can symbiotically fix nitrogen and potentially improve the soil quality and biomass productivity compared with a conventional Eucalyptus monoculture. In this study, we evaluated changes in the structure and abundance of different microbial groups and nitrogen cycle genes in mixed and pure plantations of Acacia mangium and Eucalyptus urograndis in an experimental area in southeastern Brazil. Soil samples (0e10 cm) collected in two- and three-year-old stands were submitted to chemical characterization and molecular analyses using DGGE and real time- PCR for bacteria (16S rRNA), fungi (ITS), and genes involved in nitrogen cycling (nirK, amoA, nifH). The mixed plantation did not significantly change general soil fertility or total soil C and N content compared with the Eucalyptus monoculture. However, there was a significant increase in available phosphorus and soil nitrate content in both the A. mangium and mixed-species treatments. The multivariate ordination of the DGGE profiles of bacteria, fungi and archaea groups showed distinct community structures in each treatment. Significant differences in the abundance of copies of the target genes were found for fungi, with higher values in the Eucalyptus followed by the mixed and A. mangium plantations. The analysis of nitrogen cycle genes showed no clear difference in the communities of nitrogen fixing bacteria or nitrifying archaea among treatments. The nitrification activity was dominated by archaea because it was not possible to detect the presence of bacterial nitrifiers; the denitrifier community had a distinct profile in the Eucalyptus monoculture. The abundance of archaeal amoA and nirK genes suggests that the A. mangium treatment had higher nitrification and lower denitrification than the other treatments, which would explain the higher soil nitrate levels found in pure A. mangium treatments. Our data suggest that mixed plantations of E. urograndis and A. mangium result in a distinct microbial community relative to the respective monocultures with positive effects on soil phosphorus and nitrate content, which potentially reduces the need for anthropogenic fertilization. 650 $aAcacia mangium 650 $aEucalyptus 653 $aForest microbiology 653 $aMicrobial diversity 653 $aMixed plantation 653 $aN cycling genes 700 1 $aBALIEIRO, F. de C. 700 1 $aPEIXOTO, R. S. 700 1 $aPINHEIRO, Y, A. S. 700 1 $aPICOLLO, M. C. 700 1 $aCHAER, G. M. 773 $tSoil Biology & Biochemistry$gv. 66, p. 146-153, 2013.
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Embrapa Agrobiologia (CNPAB) |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
Data corrente: |
23/09/2009 |
Data da última atualização: |
25/01/2013 |
Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
Autoria: |
NEVES, P. de C. F.; TAILLEBOIS, J. E.; NETO, F. P. M. |
Afiliação: |
PERICLES DE CARVALHO FERREIRA NEVES, CNPAF; James E. Taillebois, Cirad; FRANCISCO PEREIRA MOURA NETO, CNPAF. |
Título: |
Variação da habilidade combinatória em população mantenedora para o desenvolvimento de linhagens A em arroz. |
Ano de publicação: |
2009 |
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE ARROZ IRRIGADO, 6., 2009, Porto Alegre. Estresses e sustentabilidade: desafios para a lavoura arrozeira: anais. Porto Alegre: Palotti, 2009. |
Descrição Física: |
1 CD-ROM. |
Idioma: |
Português |
Conteúdo: |
O objetivo deste trabalho foi avaliar test crosses de uma população desenvolvida para a criação de linhagens B/A genitoras de híbridos, do Programa Arroz Híbrido Embrapa-Cirad. |
Palavras-Chave: |
Arroz híbrido; Test cross. |
Thesagro: |
Arroz; Melhoramento genético vegetal; Oryza sativa; Seleção recorrente. |
Thesaurus NAL: |
Plant breeding; Recurrent selection; Rice. |
Categoria do assunto: |
G Melhoramento Genético |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/75288/1/pl-2009.030.pdf
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Marc: |
LEADER 01042nam a2200253 a 4500 001 1428392 005 2013-01-25 008 2009 bl uuuu u00u1 u #d 100 1 $aNEVES, P. de C. F. 245 $aVariação da habilidade combinatória em população mantenedora para o desenvolvimento de linhagens A em arroz. 260 $aIn: CONGRESSO BRASILEIRO DE ARROZ IRRIGADO, 6., 2009, Porto Alegre. Estresses e sustentabilidade: desafios para a lavoura arrozeira: anais. Porto Alegre: Palotti$c2009 300 $c1 CD-ROM. 520 $aO objetivo deste trabalho foi avaliar test crosses de uma população desenvolvida para a criação de linhagens B/A genitoras de híbridos, do Programa Arroz Híbrido Embrapa-Cirad. 650 $aPlant breeding 650 $aRecurrent selection 650 $aRice 650 $aArroz 650 $aMelhoramento genético vegetal 650 $aOryza sativa 650 $aSeleção recorrente 653 $aArroz híbrido 653 $aTest cross 700 1 $aTAILLEBOIS, J. E. 700 1 $aNETO, F. P. M.
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