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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
10/03/2006 |
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Data da última atualização: |
05/10/2007 |
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Autoria: |
MENNA, P.; HUNGRIA, M.; BARCELLOS, F. G.; BANGEL, E. V.; HESS, P. N.; MARTÍNEZ-ROMERO, E. |
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Título: |
Molecular phylogeny based on the 16S rRNA gene of elite rhizobial strains used in Brazilian commercial inoculants. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Systematic and Applied Microbiology, Stuttgart, v.29, n. 4, p. 315-332, Jun. 2006. |
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Idioma: |
Inglês |
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Conteúdo: |
Nitrogen is often a limiting nutrient, therefore the sustainability of food crops, forages and green manure legumes is mainly associated with their ability to establish symbiotic associations with stem and root-nodulating N2-fixing rhizobia. The selection, identification and maintenance of elite strains for each host are critical. Decades of research in Brazil resulted in a list of strains officially recommended for several legumes, but their genetic diversity is poorly known. This study aimed at gaining a better understanding of phylogenetic relationships of 68 rhizobial strains recommended for 64 legumes, based on the sequencing of the 16S rRNA genes. The strains were isolated from a wide range of legumes, including all three subfamilies and 17 tribes. Nine main phylogenetic branches were defined, seven of them related to the rhizobial species: Bradyrhizobium japonicum, B. elkanii, Rhizobium tropici, R. leguminosarum, Sinorhizobium meliloti/S. fredii, Mesorhizobium ciceri/M. loti, and Azorhizobium caulinodans. However, some strains differed by up to 35 nucleotides from the type strains, which suggests that they may represent new species. Two other clusters included bacteria showing similarity with the genera Methylobacterium and Burkholderia, and amplification with primers for nifH and/or nodC regions was achieved with these strains. Host specificity of several strains was very low, as they were capable of nodulating legumes of different tribes and subfamilies. Furthermore, host specificity was not related to 16S rRNA, therefore evolution of ribosomal and symbiotic genes may have been diverse. Finally, the great diversity observed in this study emphasizes that tropics are an important reservoir of N2-fixation genes. MenosNitrogen is often a limiting nutrient, therefore the sustainability of food crops, forages and green manure legumes is mainly associated with their ability to establish symbiotic associations with stem and root-nodulating N2-fixing rhizobia. The selection, identification and maintenance of elite strains for each host are critical. Decades of research in Brazil resulted in a list of strains officially recommended for several legumes, but their genetic diversity is poorly known. This study aimed at gaining a better understanding of phylogenetic relationships of 68 rhizobial strains recommended for 64 legumes, based on the sequencing of the 16S rRNA genes. The strains were isolated from a wide range of legumes, including all three subfamilies and 17 tribes. Nine main phylogenetic branches were defined, seven of them related to the rhizobial species: Bradyrhizobium japonicum, B. elkanii, Rhizobium tropici, R. leguminosarum, Sinorhizobium meliloti/S. fredii, Mesorhizobium ciceri/M. loti, and Azorhizobium caulinodans. However, some strains differed by up to 35 nucleotides from the type strains, which suggests that they may represent new species. Two other clusters included bacteria showing similarity with the genera Methylobacterium and Burkholderia, and amplification with primers for nifH and/or nodC regions was achieved with these strains. Host specificity of several strains was very low, as they were capable of nodulating legumes of different tribes and subfamilies. Furthermore... Mostrar Tudo |
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Categoria do assunto: |
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LEADER 02319naa a2200181 a 4500
001 1468968
005 2007-10-05
008 2006 bl --- 0-- u #d
100 1 $aMENNA, P.
245 $aMolecular phylogeny based on the 16S rRNA gene of elite rhizobial strains used in Brazilian commercial inoculants.
260 $c2006
520 $aNitrogen is often a limiting nutrient, therefore the sustainability of food crops, forages and green manure legumes is mainly associated with their ability to establish symbiotic associations with stem and root-nodulating N2-fixing rhizobia. The selection, identification and maintenance of elite strains for each host are critical. Decades of research in Brazil resulted in a list of strains officially recommended for several legumes, but their genetic diversity is poorly known. This study aimed at gaining a better understanding of phylogenetic relationships of 68 rhizobial strains recommended for 64 legumes, based on the sequencing of the 16S rRNA genes. The strains were isolated from a wide range of legumes, including all three subfamilies and 17 tribes. Nine main phylogenetic branches were defined, seven of them related to the rhizobial species: Bradyrhizobium japonicum, B. elkanii, Rhizobium tropici, R. leguminosarum, Sinorhizobium meliloti/S. fredii, Mesorhizobium ciceri/M. loti, and Azorhizobium caulinodans. However, some strains differed by up to 35 nucleotides from the type strains, which suggests that they may represent new species. Two other clusters included bacteria showing similarity with the genera Methylobacterium and Burkholderia, and amplification with primers for nifH and/or nodC regions was achieved with these strains. Host specificity of several strains was very low, as they were capable of nodulating legumes of different tribes and subfamilies. Furthermore, host specificity was not related to 16S rRNA, therefore evolution of ribosomal and symbiotic genes may have been diverse. Finally, the great diversity observed in this study emphasizes that tropics are an important reservoir of N2-fixation genes.
700 1 $aHUNGRIA, M.
700 1 $aBARCELLOS, F. G.
700 1 $aBANGEL, E. V.
700 1 $aHESS, P. N.
700 1 $aMARTÍNEZ-ROMERO, E.
773 $tSystematic and Applied Microbiology, Stuttgart$gv.29, n. 4, p. 315-332, Jun. 2006.
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Registro original: |
Embrapa Soja (CNPSO) |
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Registro Completo
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Biblioteca(s): |
Embrapa Agroindústria Tropical. |
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Data corrente: |
24/09/2002 |
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Data da última atualização: |
03/08/2011 |
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Autoria: |
VIANA, F. M. P.; FREIRE, F. das C. O.; BARGUIL, B. M.; ALVES, R. E.; VIDAL, J. C. |
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Título: |
Podridão-basal-pós-colheita do coco anão verde no Estado do Ceará. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
Fortaleza: Embrapa Agroindústria Tropical, 2001. |
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Páginas: |
4p. |
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Série: |
(Embrapa Agroindústria Tropical; Comunicado Tecnico, 59) |
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Idioma: |
Português |
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Conteúdo: |
A pesquisa demonstra a podridão-basal-pós-colheita do coco anão verde no Estado do Ceará, cuja ação do patógeno é denunciada por uma anasarca que antecede a necrose e forma uma nítida linha demarcatória entre o tecido afetado e o tecido sadio. |
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Palavras-Chave: |
Botryodiploidia theobromae; Brasil; Ceará; Coco Anão Verde; Coconut; Control; Controle; Coqueiro; Doença de plantas; Fitopatologia; Fortaleza; Fungal diseases; Lasiodiploidia theobromae; Plant disease; Plant diseases; Podridão basal; Podridao-basal-pos-colheita. |
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Thesagro: |
Coco; Cocos Nucifera; Doença; Doença de Planta; Doença Fúngica; Fungo; Lasiodiplodia Theobromae; Patógeno; Podridão. |
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Thesaurus NAL: |
coconuts; pathogens. |
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Categoria do assunto: |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CNPAT/7872/1/ct_59.pdf
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Marc: |
LEADER 01629nam a2200517 a 4500
001 1425160
005 2011-08-03
008 2001 bl uuuu u0uu1 u #d
100 1 $aVIANA, F. M. P.
245 $aPodridão-basal-pós-colheita do coco anão verde no Estado do Ceará.
260 $aFortaleza: Embrapa Agroindústria Tropical$c2001
300 $a4p.
490 $a(Embrapa Agroindústria Tropical; Comunicado Tecnico, 59)
520 $aA pesquisa demonstra a podridão-basal-pós-colheita do coco anão verde no Estado do Ceará, cuja ação do patógeno é denunciada por uma anasarca que antecede a necrose e forma uma nítida linha demarcatória entre o tecido afetado e o tecido sadio.
650 $acoconuts
650 $apathogens
650 $aCoco
650 $aCocos Nucifera
650 $aDoença
650 $aDoença de Planta
650 $aDoença Fúngica
650 $aFungo
650 $aLasiodiplodia Theobromae
650 $aPatógeno
650 $aPodridão
653 $aBotryodiploidia theobromae
653 $aBrasil
653 $aCeará
653 $aCoco Anão Verde
653 $aCoconut
653 $aControl
653 $aControle
653 $aCoqueiro
653 $aDoença de plantas
653 $aFitopatologia
653 $aFortaleza
653 $aFungal diseases
653 $aLasiodiploidia theobromae
653 $aPlant disease
653 $aPlant diseases
653 $aPodridão basal
653 $aPodridao-basal-pos-colheita
700 1 $aFREIRE, F. das C. O.
700 1 $aBARGUIL, B. M.
700 1 $aALVES, R. E.
700 1 $aVIDAL, J. C.
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Embrapa Agroindústria Tropical (CNPAT) |
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