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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados; Embrapa Rondônia; Embrapa Trigo. |
Data corrente: |
12/02/1993 |
Data da última atualização: |
12/02/1993 |
Autoria: |
MENDES, R. C. A. |
Título: |
Restricoes fisicas ao crescimento radicular em latossolo muito argiloso. |
Ano de publicação: |
1989 |
Fonte/Imprenta: |
Brasilia: UnB, 1989. |
Páginas: |
81p. |
Idioma: |
Português |
Notas: |
Tese Mestrado. |
Conteúdo: |
Várias áreas cultivadas na regiões dos cerrados tem apresentado uma camada de restrições ao crescimento radicular, logo abaixo da superfície. Com a reduções do volume de solo a ser explorado, as plantas tornam-se mais vulneráveis a problemas de deficit hídrico. Como as observações de campo mostram restrições ao enraizamento em profundidade em solos sem limitações químicas, com densidades relativamente baixas, em torno de 1,00 Mg.m-3, outros parâmetros devem estar interferindo nesse processo. Para detectar estes parâmetros, foi realizado um experimento em câmara de crescimento, utilizando amostras de um Latossolo Vermelho-Amarelo, textura muito argilosa, com densidade e umidade controladas, onde foram avaliadas as respostas de plantas jovens de soja e milho. A resistência do solo a penetrações foi o melhor indicador de obstáculo ao crescimento radicular (rsoja = -0,914 e rmilho = -0,884). A densidade global e umidade também apresentaram coeficientes de correlações significativos. A densidade de comprimento radicular se mostrou um parâmetro adequado para avaliações funcional do sistema radicular, ao menos no estágio jovem, o que demonstrado pelos altos coeficientes de correlações linear entre estes e os parâmetros da parte aérea. |
Palavras-Chave: |
Brasil; Dark-red latosol; Growth; Latossolo vermelho-amarelo; Maize; Root. |
Thesagro: |
Água; Cerrado; Crescimento; Disponibilidade de Água; Glycine Max; Milho; Planta; Raiz; Sistema Radicular; Soja; Solo; Zea Mays. |
Thesaurus Nal: |
Ferralsols; soil; soybeans; water. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02201nam a2200397 a 4500 001 1547918 005 1993-02-12 008 1989 bl uuuu m 00u1 u #d 100 1 $aMENDES, R. C. A. 245 $aRestricoes fisicas ao crescimento radicular em latossolo muito argiloso. 260 $aBrasilia: UnB$c1989 300 $a81p. 500 $aTese Mestrado. 520 $aVárias áreas cultivadas na regiões dos cerrados tem apresentado uma camada de restrições ao crescimento radicular, logo abaixo da superfície. Com a reduções do volume de solo a ser explorado, as plantas tornam-se mais vulneráveis a problemas de deficit hídrico. Como as observações de campo mostram restrições ao enraizamento em profundidade em solos sem limitações químicas, com densidades relativamente baixas, em torno de 1,00 Mg.m-3, outros parâmetros devem estar interferindo nesse processo. Para detectar estes parâmetros, foi realizado um experimento em câmara de crescimento, utilizando amostras de um Latossolo Vermelho-Amarelo, textura muito argilosa, com densidade e umidade controladas, onde foram avaliadas as respostas de plantas jovens de soja e milho. A resistência do solo a penetrações foi o melhor indicador de obstáculo ao crescimento radicular (rsoja = -0,914 e rmilho = -0,884). A densidade global e umidade também apresentaram coeficientes de correlações significativos. A densidade de comprimento radicular se mostrou um parâmetro adequado para avaliações funcional do sistema radicular, ao menos no estágio jovem, o que demonstrado pelos altos coeficientes de correlações linear entre estes e os parâmetros da parte aérea. 650 $aFerralsols 650 $asoil 650 $asoybeans 650 $awater 650 $aÁgua 650 $aCerrado 650 $aCrescimento 650 $aDisponibilidade de Água 650 $aGlycine Max 650 $aMilho 650 $aPlanta 650 $aRaiz 650 $aSistema Radicular 650 $aSoja 650 $aSolo 650 $aZea Mays 653 $aBrasil 653 $aDark-red latosol 653 $aGrowth 653 $aLatossolo vermelho-amarelo 653 $aMaize 653 $aRoot
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Embrapa Cerrados (CPAC) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Agrobiologia. Para informações adicionais entre em contato com cnpab.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
21/06/2001 |
Data da última atualização: |
21/06/2001 |
Autoria: |
JAMES, E. K.; OLIVARES, F. L.; OLIVEIRA, A. L. M. de; REIS JÚNIOR, F. B. dos; SILVA, L. G. da; REIS, V. M. |
Título: |
Further observations on the interaction between sugar can and Gluconacetobacter diazotrophicus under laboratory and greenhouse conditions. |
Ano de publicação: |
2001 |
Fonte/Imprenta: |
Journal of Experimental Botany, London, v. 52, n. 357, p. 747-760, apr. 2001. |
Idioma: |
Inglês |
Conteúdo: |
Sugar cane (Saccharum spp.) variety SP 70-1143 was inoculated with Gluconacetobacter diazotrophicus strain PAL5 (ATCC 49037) in two experiments. In experiment 1 the bacteria were inoculated into a modified, low sucrose MS medium within which micropropagated plantlets were rooted. After 10 d there was extensive anatomical evidence of endophytic colonization by G. diazotrophicus, particularly in lower stems, where high numbers of bacteria were visible within some of the xylem vessels. The identity of the bacteria was confirmed by immunogold label- ling with an antibody raised against G. diazotrophicus. On the lower stems there were breaks caused by the separation of the plantlets into individuais, and at these "wounds' bacteria were seen colonizing the xylem and intercellular spaces. Bacteria were also occasionally seen entering leaves via damaged stomata, and subsequently colonizing sub-stomatal cavities and intercellular spaces. A localized host defence response in the form of fibrillar material surrounding the bacteria was associated with both the stem and leaf invasion. In experiment 2, stems of 5-week-old greenhouse-grown plants were inoculated by injection with a suspension of G. diazotrophicus containing 108 bacteria ml-1. No hypersensitive response (HR) was observed, and no symptoms were visible on the leaves and stems for the duration of the experiment (7 d). Close to the point of inoculation, G. diazotrophicus cells were observed within the protoxylem and the xylem parenchyma, where they were surrounded by fibrillar material that stained light-green with toluidine blue. In leaf samples taken up to 4 cm from the inoculation points, G. diazotrophicus cells were mainly found within the metaxylem, where they were surrounded by a light green-staining material. The bacteria were growing in relatively low numbers adjacent to the xylem cell walls, and they were separated from the host-derived material by electron-transparent 'haloes' that contained material that reacted with the G. diazotrophicus antibody. MenosSugar cane (Saccharum spp.) variety SP 70-1143 was inoculated with Gluconacetobacter diazotrophicus strain PAL5 (ATCC 49037) in two experiments. In experiment 1 the bacteria were inoculated into a modified, low sucrose MS medium within which micropropagated plantlets were rooted. After 10 d there was extensive anatomical evidence of endophytic colonization by G. diazotrophicus, particularly in lower stems, where high numbers of bacteria were visible within some of the xylem vessels. The identity of the bacteria was confirmed by immunogold label- ling with an antibody raised against G. diazotrophicus. On the lower stems there were breaks caused by the separation of the plantlets into individuais, and at these "wounds' bacteria were seen colonizing the xylem and intercellular spaces. Bacteria were also occasionally seen entering leaves via damaged stomata, and subsequently colonizing sub-stomatal cavities and intercellular spaces. A localized host defence response in the form of fibrillar material surrounding the bacteria was associated with both the stem and leaf invasion. In experiment 2, stems of 5-week-old greenhouse-grown plants were inoculated by injection with a suspension of G. diazotrophicus containing 108 bacteria ml-1. No hypersensitive response (HR) was observed, and no symptoms were visible on the leaves and stems for the duration of the experiment (7 d). Close to the point of inoculation, G. diazotrophicus cells were observed within the protoxylem and the xylem p... Mostrar Tudo |
Palavras-Chave: |
Bactéria endofítica; Biological nitrogen fixation; BNF; Cana-de-açúcar; Casa de vegetação; Endophytic bacteria; FBN; Fixação bológica de nitrogênio; Greenhouse; Saccharum spp. |
Thesaurus NAL: |
Gluconacetobacter diazotrophicus; sugarcane. |
Categoria do assunto: |
-- |
Marc: |
LEADER 03060naa a2200325 a 4500 001 1598609 005 2001-06-21 008 2001 bl --- 0-- u #d 100 1 $aJAMES, E. K. 245 $aFurther observations on the interaction between sugar can and Gluconacetobacter diazotrophicus under laboratory and greenhouse conditions. 260 $c2001 520 $aSugar cane (Saccharum spp.) variety SP 70-1143 was inoculated with Gluconacetobacter diazotrophicus strain PAL5 (ATCC 49037) in two experiments. In experiment 1 the bacteria were inoculated into a modified, low sucrose MS medium within which micropropagated plantlets were rooted. After 10 d there was extensive anatomical evidence of endophytic colonization by G. diazotrophicus, particularly in lower stems, where high numbers of bacteria were visible within some of the xylem vessels. The identity of the bacteria was confirmed by immunogold label- ling with an antibody raised against G. diazotrophicus. On the lower stems there were breaks caused by the separation of the plantlets into individuais, and at these "wounds' bacteria were seen colonizing the xylem and intercellular spaces. Bacteria were also occasionally seen entering leaves via damaged stomata, and subsequently colonizing sub-stomatal cavities and intercellular spaces. A localized host defence response in the form of fibrillar material surrounding the bacteria was associated with both the stem and leaf invasion. In experiment 2, stems of 5-week-old greenhouse-grown plants were inoculated by injection with a suspension of G. diazotrophicus containing 108 bacteria ml-1. No hypersensitive response (HR) was observed, and no symptoms were visible on the leaves and stems for the duration of the experiment (7 d). Close to the point of inoculation, G. diazotrophicus cells were observed within the protoxylem and the xylem parenchyma, where they were surrounded by fibrillar material that stained light-green with toluidine blue. In leaf samples taken up to 4 cm from the inoculation points, G. diazotrophicus cells were mainly found within the metaxylem, where they were surrounded by a light green-staining material. The bacteria were growing in relatively low numbers adjacent to the xylem cell walls, and they were separated from the host-derived material by electron-transparent 'haloes' that contained material that reacted with the G. diazotrophicus antibody. 650 $aGluconacetobacter diazotrophicus 650 $asugarcane 653 $aBactéria endofítica 653 $aBiological nitrogen fixation 653 $aBNF 653 $aCana-de-açúcar 653 $aCasa de vegetação 653 $aEndophytic bacteria 653 $aFBN 653 $aFixação bológica de nitrogênio 653 $aGreenhouse 653 $aSaccharum spp 700 1 $aOLIVARES, F. L. 700 1 $aOLIVEIRA, A. L. M. de 700 1 $aREIS JÚNIOR, F. B. dos 700 1 $aSILVA, L. G. da 700 1 $aREIS, V. M. 773 $tJournal of Experimental Botany, London$gv. 52, n. 357, p. 747-760, apr. 2001.
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