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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
10/12/2004 |
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Data da última atualização: |
28/10/2009 |
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Autoria: |
REIS JÚNIOR, F. B. dos; TEIXEIRA, K. R. dos S.; URQUIAGA, S.; REIS, V. M. |
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Título: |
Associação de bactérias promotoras de crescimento de plantas do gênero Azospirillum com diferentes espécies de brachiaria. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Planaltina, DF: Embrapa Cerrados, 2003. |
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Páginas: |
52 p. |
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Série: |
(Embrapa Cerrados. Documentos, 81). |
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Idioma: |
Português |
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Conteúdo: |
ABSTRACT: The limitation of nitrogen is considered one of the most important factors to the pastures degradation. However there are evidences that pastures formed by some species of the genus Brachiaria could be benefit with the biological nitrogen fixation process (BNF), guaranteeing to these pastures higher longevity. The diazotrophic bacteria founded in association with these forage grasses were mainly species from the Azospirillum genus. The associations between these microrganisms and the plants are generally conditioned to the vegetation, therefore is possible that different genotypes of Brachiaria exercise a selective efffect on the populations of these, what could result in different BNF contributions. It was objectified to establish the influence of the Brachiaria species, pasture management and seasonal variations on the bacteria populations from the Azospirillum genus associated with the roots of these plants. Different pastures (B.humidicola, B. decumbens and B. brizantha) were implanted in areas of the Cerrado ecosystem and of the Atlantic Forest. Two management systems with different stocking rates (higher and lower) were evaluated. The collects of plant samples from each experimental treatment were accomplished in different times of the year. For the isolation and qualification of the diazotrophic bacteria traditional techniques were utilised with the use of semi-specific and semi-solid culture media without nitrogen. A. lipoferum, A. brasiliense and A. amazonense were isolated from root samples of the three analysed Brachiaria species. The estimates of the bacterial populations from these species varied from 10(elevado a 3) - 10 (elevado a 7) cells. g. of roots. In the samples of the Cerrado ecosystem, the collect time presented significant effects on the population of these bacteria. The data from the Atlantic forest region experiment showed that plants of Brachiaria from different species and pastures under different stocking rates can present different populations numbers of Azospirillum spp. associated to its roots. MenosABSTRACT: The limitation of nitrogen is considered one of the most important factors to the pastures degradation. However there are evidences that pastures formed by some species of the genus Brachiaria could be benefit with the biological nitrogen fixation process (BNF), guaranteeing to these pastures higher longevity. The diazotrophic bacteria founded in association with these forage grasses were mainly species from the Azospirillum genus. The associations between these microrganisms and the plants are generally conditioned to the vegetation, therefore is possible that different genotypes of Brachiaria exercise a selective efffect on the populations of these, what could result in different BNF contributions. It was objectified to establish the influence of the Brachiaria species, pasture management and seasonal variations on the bacteria populations from the Azospirillum genus associated with the roots of these plants. Different pastures (B.humidicola, B. decumbens and B. brizantha) were implanted in areas of the Cerrado ecosystem and of the Atlantic Forest. Two management systems with different stocking rates (higher and lower) were evaluated. The collects of plant samples from each experimental treatment were accomplished in different times of the year. For the isolation and qualification of the diazotrophic bacteria traditional techniques were utilised with the use of semi-specific and semi-solid culture media without nitrogen. A. lipoferum, A. brasiliense and A. amazon... Mostrar Tudo |
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Palavras-Chave: |
Degredação. |
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Thesagro: |
Bactéria; Brachiaria; Fixação de Nitrogênio; Microbiologia do Solo; Pastagem. |
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Thesaurus Nal: |
Azospirillum amazonense; degradation; microbiology; nitrogen fixation; pastures; soil. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CPAC-2009/25011/1/doc_81.pdf
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Marc: |
LEADER 02982nam a2200313 a 4500
001 1567997
005 2009-10-28
008 2003 bl uuuu 00u1 u #d
100 1 $aREIS JÚNIOR, F. B. dos
245 $aAssociação de bactérias promotoras de crescimento de plantas do gênero Azospirillum com diferentes espécies de brachiaria.
260 $aPlanaltina, DF: Embrapa Cerrados$c2003
300 $a52 p.
490 $a(Embrapa Cerrados. Documentos, 81).
520 $aABSTRACT: The limitation of nitrogen is considered one of the most important factors to the pastures degradation. However there are evidences that pastures formed by some species of the genus Brachiaria could be benefit with the biological nitrogen fixation process (BNF), guaranteeing to these pastures higher longevity. The diazotrophic bacteria founded in association with these forage grasses were mainly species from the Azospirillum genus. The associations between these microrganisms and the plants are generally conditioned to the vegetation, therefore is possible that different genotypes of Brachiaria exercise a selective efffect on the populations of these, what could result in different BNF contributions. It was objectified to establish the influence of the Brachiaria species, pasture management and seasonal variations on the bacteria populations from the Azospirillum genus associated with the roots of these plants. Different pastures (B.humidicola, B. decumbens and B. brizantha) were implanted in areas of the Cerrado ecosystem and of the Atlantic Forest. Two management systems with different stocking rates (higher and lower) were evaluated. The collects of plant samples from each experimental treatment were accomplished in different times of the year. For the isolation and qualification of the diazotrophic bacteria traditional techniques were utilised with the use of semi-specific and semi-solid culture media without nitrogen. A. lipoferum, A. brasiliense and A. amazonense were isolated from root samples of the three analysed Brachiaria species. The estimates of the bacterial populations from these species varied from 10(elevado a 3) - 10 (elevado a 7) cells. g. of roots. In the samples of the Cerrado ecosystem, the collect time presented significant effects on the population of these bacteria. The data from the Atlantic forest region experiment showed that plants of Brachiaria from different species and pastures under different stocking rates can present different populations numbers of Azospirillum spp. associated to its roots.
650 $aAzospirillum amazonense
650 $adegradation
650 $amicrobiology
650 $anitrogen fixation
650 $apastures
650 $asoil
650 $aBactéria
650 $aBrachiaria
650 $aFixação de Nitrogênio
650 $aMicrobiologia do Solo
650 $aPastagem
653 $aDegredação
700 1 $aTEIXEIRA, K. R. dos S.
700 1 $aURQUIAGA, S.
700 1 $aREIS, V. M.
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Registro original: |
Embrapa Cerrados (CPAC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
21/02/2013 |
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Data da última atualização: |
21/02/2013 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
NASCIMENTO, W. M. O. do; CARVALHO, J. E. U. de; RIBEIRO, O. D.; RODRIGUES, O. M. |
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Afiliação: |
WALNICE MARIA O DO NASCIMENTO, CPATU; JOSE EDMAR URANO DE CARVALHO, CPATU; OLIVIA DOMINGUES RIBEIRO, UFRA; ORLANDO MACIEL RODRIGUES, UFRA. |
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Título: |
Germinação de sementes de muruci submetidas à secagem. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE RECURSOS GENÉTICOS, 2., 2012, Belém, PA. Anais... Brasília, DF: Sociedade Brasileira de Recursos Genéticos, 2012. |
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Descrição Física: |
1 CD-ROM. |
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Idioma: |
Português |
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Conteúdo: |
O objetivo do trabalho foi verificar as respostas fisiológicas de sementes de muruci submetidas a secagem. Antes e após cada período de secagem foi retirado amostra de sementes para as seguintes determinações: teor de água das sementes e porcentagem de germinação. Concomitante ao teste de germinação foi feita a contagem diária do número de plântulas emersas até 60 dias após a semeadura. Para a análise de variância foi adotado o delineamento inteiramente casualizado com quatro repetições de 50 pirênios cada, em arranjo fatorial com dois fatores, sendo, três (clones) e cinco (tempo de secagem). O tempo de secagem das sementes afetou positiva e significativamente a porcentagem e o tempo médio de germinação. A secagem dos pirênios favorece a porcentagem de germinação de sementes de muruci, independentemente do clone. |
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Palavras-Chave: |
Muruci. |
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Thesagro: |
Dormência. |
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Thesaurus NAL: |
Byrsonima crassifolia; vigor. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/76997/1/118.pdf
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Marc: |
LEADER 01503nam a2200205 a 4500
001 1950520
005 2013-02-21
008 2012 bl uuuu u00u1 u #d
100 1 $aNASCIMENTO, W. M. O. do
245 $aGerminação de sementes de muruci submetidas à secagem.
260 $aIn: CONGRESSO BRASILEIRO DE RECURSOS GENÉTICOS, 2., 2012, Belém, PA. Anais... Brasília, DF: Sociedade Brasileira de Recursos Genéticos$c2012
300 $c1 CD-ROM.
520 $aO objetivo do trabalho foi verificar as respostas fisiológicas de sementes de muruci submetidas a secagem. Antes e após cada período de secagem foi retirado amostra de sementes para as seguintes determinações: teor de água das sementes e porcentagem de germinação. Concomitante ao teste de germinação foi feita a contagem diária do número de plântulas emersas até 60 dias após a semeadura. Para a análise de variância foi adotado o delineamento inteiramente casualizado com quatro repetições de 50 pirênios cada, em arranjo fatorial com dois fatores, sendo, três (clones) e cinco (tempo de secagem). O tempo de secagem das sementes afetou positiva e significativamente a porcentagem e o tempo médio de germinação. A secagem dos pirênios favorece a porcentagem de germinação de sementes de muruci, independentemente do clone.
650 $aByrsonima crassifolia
650 $avigor
650 $aDormência
653 $aMuruci
700 1 $aCARVALHO, J. E. U. de
700 1 $aRIBEIRO, O. D.
700 1 $aRODRIGUES, O. M.
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Embrapa Amazônia Oriental (CPATU) |
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