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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
26/04/1999 |
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Data da última atualização: |
26/04/1999 |
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Autoria: |
JAMES, E. K.; OLIVARES, F. L.; BALDANI, J. I.; DOBEREINER, Johanna. |
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Título: |
Herbaspirillum, an endophytic diazotroph colonizing vascular tissue in leaves of Sorghum bicolor L. Moench. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Journal of Experimental Botany, Oxford, v. 48, n. 308, p. 785-797, 1997. |
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Idioma: |
Inglês |
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Conteúdo: |
Leaves of Sorghum bicolor wre examined at 5 d and 14 d after inoculation with the N2-fixing endophytic bacteria Herbaspirillum seropedicae and Herbaspirillum rubrisubalbicans. Plants inoculated with H. rubrisubalbicans expressed symptoms of 'red stripe disease i.e. red stripes along the secondary veins of the leaf blade close to the inoculation point and spreading up the leaves. Infected leaves showed dense colonization by H. rubrisubalbicans in regions showing red stripe symptoms at 5 d after inoculation. The infection was confined within the vascular system, in particular, the protoxylem and associated lacunae, which were often completely filled with bacteria, with some of the latter expressing nitrogenase. The bacteria were recognized using H. rubrisubalb icans-specific antibodies and immunogold labelling, which also showed that the antibody reacted with material on the surface of the bacteria, and that this mucus was released into the lumen of the xylem. At 14 d after inoculation, disease symptoms were slightly more severe, with both meta- and protoxylem being even more heavily colonized in parts of the leaf showing red stripes. However, a strong host defence response was also apparent at this stage, with gums lining the walls of the vessels and enclosing the bacteria, although the latter were still actively dividing. At the edges of visible disease symptoms, plant gums filled the xylem; bacteria had formed distinct colonies within these gums, with some of the colonies associated with the xylem walls. Plants inoculated with H. seropedicae either did not express the disease or showed very mild symptoms close to the inoculation point. In the latter case, H. seropedicae were localized within protoxylem vessels and the metaxylem was partly occluded with plant-derived gums. By contrast with H. rubrisubalbicans, H. seropedicae was also localized in leaves at 14 d without disease symptoms and did not always appear to elicit a host response, i.e. they colonized the walls of metaxylem, with the xylem vessels themselves remaining unoccluded and largely free of gums. The fine line separating plant pathogens, endophytes and symbioses is discussed in light of these results. MenosLeaves of Sorghum bicolor wre examined at 5 d and 14 d after inoculation with the N2-fixing endophytic bacteria Herbaspirillum seropedicae and Herbaspirillum rubrisubalbicans. Plants inoculated with H. rubrisubalbicans expressed symptoms of 'red stripe disease i.e. red stripes along the secondary veins of the leaf blade close to the inoculation point and spreading up the leaves. Infected leaves showed dense colonization by H. rubrisubalbicans in regions showing red stripe symptoms at 5 d after inoculation. The infection was confined within the vascular system, in particular, the protoxylem and associated lacunae, which were often completely filled with bacteria, with some of the latter expressing nitrogenase. The bacteria were recognized using H. rubrisubalb icans-specific antibodies and immunogold labelling, which also showed that the antibody reacted with material on the surface of the bacteria, and that this mucus was released into the lumen of the xylem. At 14 d after inoculation, disease symptoms were slightly more severe, with both meta- and protoxylem being even more heavily colonized in parts of the leaf showing red stripes. However, a strong host defence response was also apparent at this stage, with gums lining the walls of the vessels and enclosing the bacteria, although the latter were still actively dividing. At the edges of visible disease symptoms, plant gums filled the xylem; bacteria had formed distinct colonies within these gums, with some of the colonies ... Mostrar Tudo |
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Palavras-Chave: |
Bacterias; BNF; Diazotrofica; Diazotrophs; Endofito; FBN; Fixação biologica de nitrogênio; Nitrogen fixing bacteria. |
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Thesagro: |
Bactéria; Folha; Xilema. |
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Thesaurus Nal: |
endophytes; Herbaspirillum rubrisubalbicans; Herbaspirillum seropedicae; leaves; xylem. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03180naa a2200349 a 4500
001 1621054
005 1999-04-26
008 1997 bl uuuu u00u1 u #d
100 1 $aJAMES, E. K.
245 $aHerbaspirillum, an endophytic diazotroph colonizing vascular tissue in leaves of Sorghum bicolor L. Moench.
260 $c1997
520 $aLeaves of Sorghum bicolor wre examined at 5 d and 14 d after inoculation with the N2-fixing endophytic bacteria Herbaspirillum seropedicae and Herbaspirillum rubrisubalbicans. Plants inoculated with H. rubrisubalbicans expressed symptoms of 'red stripe disease i.e. red stripes along the secondary veins of the leaf blade close to the inoculation point and spreading up the leaves. Infected leaves showed dense colonization by H. rubrisubalbicans in regions showing red stripe symptoms at 5 d after inoculation. The infection was confined within the vascular system, in particular, the protoxylem and associated lacunae, which were often completely filled with bacteria, with some of the latter expressing nitrogenase. The bacteria were recognized using H. rubrisubalb icans-specific antibodies and immunogold labelling, which also showed that the antibody reacted with material on the surface of the bacteria, and that this mucus was released into the lumen of the xylem. At 14 d after inoculation, disease symptoms were slightly more severe, with both meta- and protoxylem being even more heavily colonized in parts of the leaf showing red stripes. However, a strong host defence response was also apparent at this stage, with gums lining the walls of the vessels and enclosing the bacteria, although the latter were still actively dividing. At the edges of visible disease symptoms, plant gums filled the xylem; bacteria had formed distinct colonies within these gums, with some of the colonies associated with the xylem walls. Plants inoculated with H. seropedicae either did not express the disease or showed very mild symptoms close to the inoculation point. In the latter case, H. seropedicae were localized within protoxylem vessels and the metaxylem was partly occluded with plant-derived gums. By contrast with H. rubrisubalbicans, H. seropedicae was also localized in leaves at 14 d without disease symptoms and did not always appear to elicit a host response, i.e. they colonized the walls of metaxylem, with the xylem vessels themselves remaining unoccluded and largely free of gums. The fine line separating plant pathogens, endophytes and symbioses is discussed in light of these results.
650 $aendophytes
650 $aHerbaspirillum rubrisubalbicans
650 $aHerbaspirillum seropedicae
650 $aleaves
650 $axylem
650 $aBactéria
650 $aFolha
650 $aXilema
653 $aBacterias
653 $aBNF
653 $aDiazotrofica
653 $aDiazotrophs
653 $aEndofito
653 $aFBN
653 $aFixação biologica de nitrogênio
653 $aNitrogen fixing bacteria
700 1 $aOLIVARES, F. L.
700 1 $aBALDANI, J. I.
700 1 $aDOBEREINER, Johanna.
773 $tJournal of Experimental Botany, Oxford$gv. 48, n. 308, p. 785-797, 1997.
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Embrapa Agrobiologia (CNPAB) |
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| 2. |  | COSTA, E.; MESQUITA, V. do A. G.; LEAL, P. A. M.; FERNANDES, C. D.; ABOT, A. R. Formação de mudas de mamão em ambientes de cultivo protegido em diferentes substratos. Revista Ceres, Viçosa, MG, v. 57, n.5, p. 679-685, set./out., 2010. Título em inglês: Papaya seedling formation in different substrates and protected environments.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 3 |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 3. | | COSTA, E.; MARTINS, R. F.; FARIA, T. A. C.; JORGE, M. H. A.; LEAL, P. A. M. Seedlings of Acrocomia aculenta in different substrates and protected environments. Engenharia Agricola, Jaboticabal, v. 34, n. 3, p. 395-404, maio/jun. 2014.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Hortaliças. |
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