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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
08/01/2001 |
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Data da última atualização: |
08/01/2001 |
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Autoria: |
YANG, C. -H.; CROWLEY, D. E. |
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Título: |
Rhizosphere microbial community structure in relation to root location and plant iron nutritional status. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
Applied and Environmental Microbiology, Washington, v. 66, p. 345-351, 2000. |
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Idioma: |
Inglês |
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Conteúdo: |
Root exudate composition and quantity vary in relation to plant nutritional status, but the impact of the differences on rhizosphere microbial communities is not known. To examine this question, we performed an experiment with barley (Hordeum vulgare) plants under iron-limiting and iron-sufficient growth conditions. Plants were grown in an iron-limiting soil in root box microcosms. One-half of the plants were treated with foliar iron every day to inhibit phytosiderophore production and to alter root exudate composition. After 30 days, the bacterial communities associated with different root zones, including the primary root tips, nonelongating secondary root tips, sites of lateral root emergence, and older roots distal from the tip, were characterized by using 16S ribosomal DNA (rDNA) fingerprints generated by PCR-denaturing gradient gel electrophoresis (DGGE). Our results showed that the microbial communities associated with the different root locations produced many common 16S rDNA bands but that the communities could be distinguished by using correspondence analysis. Approximately 40% of the variation between communities could be attributed to plant iron nutritional status. A sequence analysis of clones generated from a single 16S rDNA band obtained at all of the root locations revealed that there were taxonomically different species in the same band, suggesting that the resolving power of DGGE for characterization of community structure at the species levels is limited. Our results suggest that the bacterial communities in the rhizosphere are substantially different in different root zones and that a rhizosphere community may be altered by changes in root exudate composition caused by changes in plant iron nutritional status. MenosRoot exudate composition and quantity vary in relation to plant nutritional status, but the impact of the differences on rhizosphere microbial communities is not known. To examine this question, we performed an experiment with barley (Hordeum vulgare) plants under iron-limiting and iron-sufficient growth conditions. Plants were grown in an iron-limiting soil in root box microcosms. One-half of the plants were treated with foliar iron every day to inhibit phytosiderophore production and to alter root exudate composition. After 30 days, the bacterial communities associated with different root zones, including the primary root tips, nonelongating secondary root tips, sites of lateral root emergence, and older roots distal from the tip, were characterized by using 16S ribosomal DNA (rDNA) fingerprints generated by PCR-denaturing gradient gel electrophoresis (DGGE). Our results showed that the microbial communities associated with the different root locations produced many common 16S rDNA bands but that the communities could be distinguished by using correspondence analysis. Approximately 40% of the variation between communities could be attributed to plant iron nutritional status. A sequence analysis of clones generated from a single 16S rDNA band obtained at all of the root locations revealed that there were taxonomically different species in the same band, suggesting that the resolving power of DGGE for characterization of community structure at the species levels is limited. ... Mostrar Tudo |
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Thesagro: |
Cevada; Hordeum Vulgare; Raiz; Rizosfera; Sideróforo. |
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Thesaurus Nal: |
barley; rhizosphere; roots; siderophores. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02426naa a2200241 a 4500
001 1621190
005 2001-01-08
008 2000 bl --- 0-- u #d
100 1 $aYANG, C. -H.
245 $aRhizosphere microbial community structure in relation to root location and plant iron nutritional status.
260 $c2000
520 $aRoot exudate composition and quantity vary in relation to plant nutritional status, but the impact of the differences on rhizosphere microbial communities is not known. To examine this question, we performed an experiment with barley (Hordeum vulgare) plants under iron-limiting and iron-sufficient growth conditions. Plants were grown in an iron-limiting soil in root box microcosms. One-half of the plants were treated with foliar iron every day to inhibit phytosiderophore production and to alter root exudate composition. After 30 days, the bacterial communities associated with different root zones, including the primary root tips, nonelongating secondary root tips, sites of lateral root emergence, and older roots distal from the tip, were characterized by using 16S ribosomal DNA (rDNA) fingerprints generated by PCR-denaturing gradient gel electrophoresis (DGGE). Our results showed that the microbial communities associated with the different root locations produced many common 16S rDNA bands but that the communities could be distinguished by using correspondence analysis. Approximately 40% of the variation between communities could be attributed to plant iron nutritional status. A sequence analysis of clones generated from a single 16S rDNA band obtained at all of the root locations revealed that there were taxonomically different species in the same band, suggesting that the resolving power of DGGE for characterization of community structure at the species levels is limited. Our results suggest that the bacterial communities in the rhizosphere are substantially different in different root zones and that a rhizosphere community may be altered by changes in root exudate composition caused by changes in plant iron nutritional status.
650 $abarley
650 $arhizosphere
650 $aroots
650 $asiderophores
650 $aCevada
650 $aHordeum Vulgare
650 $aRaiz
650 $aRizosfera
650 $aSideróforo
700 1 $aCROWLEY, D. E.
773 $tApplied and Environmental Microbiology, Washington$gv. 66, p. 345-351, 2000.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Registro Completo
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
11/11/2010 |
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Data da última atualização: |
27/08/2021 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
LIMA, A. M. C.; ARAÚJO, M. S. de; ALVES, S. M.; ALVES, F. S. F. |
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Afiliação: |
Graduanda, Universidade Estadual Vale do Acaraú; Graduanda, Universidade Estadual Vale do Acaraú; Graduanda, Universidade Estadual Vale do Acaraú; FRANCISCO SELMO FERNANDES ALVES, CNPC. |
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Título: |
Fatores que envolvem o processo de produção da "Manta de carneiro" do município de Taua-CE. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
In: ENCONTRO DE INICIAÇÃO CIENTÍFICA DA UNIVERSIDADE ESTADUAL VALE DO ACARAÚ, 7., 2010, Sobral. Iniciação para o semiárido: [Resumos]. Sobral: Universidade Estadual Vale do Acaraú, 2010. 1 CD ROM. |
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Idioma: |
Português |
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Palavras-Chave: |
Carne ovina; Manta de carneiro; Manta de Tauá; Ovinocultura de corte; Produto cárneo. |
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Thesagro: |
Carne; Ovino; Processamento; Produto de origem animal. |
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Thesaurus NAL: |
Brazil; Meat processing; Meat products; Sheep meat. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/48938/1/RAC-Fatores-que-envolvem.pdf
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Marc: |
LEADER 00999nam a2200289 a 4500
001 1866812
005 2021-08-27
008 2010 bl uuuu u00u1 u #d
100 1 $aLIMA, A. M. C.
245 $aFatores que envolvem o processo de produção da "Manta de carneiro" do município de Taua-CE.$h[electronic resource]
260 $aIn: ENCONTRO DE INICIAÇÃO CIENTÍFICA DA UNIVERSIDADE ESTADUAL VALE DO ACARAÚ, 7., 2010, Sobral. Iniciação para o semiárido: [Resumos]. Sobral: Universidade Estadual Vale do Acaraú, 2010. 1 CD ROM.$c2010
650 $aBrazil
650 $aMeat processing
650 $aMeat products
650 $aSheep meat
650 $aCarne
650 $aOvino
650 $aProcessamento
650 $aProduto de origem animal
653 $aCarne ovina
653 $aManta de carneiro
653 $aManta de Tauá
653 $aOvinocultura de corte
653 $aProduto cárneo
700 1 $aARAÚJO, M. S. de
700 1 $aALVES, S. M.
700 1 $aALVES, F. S. F.
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Embrapa Caprinos e Ovinos (CNPC) |
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