Azospirillum Spp
Mostrando 25-36 de 45 artigos, teses e dissertações.
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25. Identificação de isolados de Azospirillum amazonense associados a Brachiaria spp., em diferentes épocas e condições de cultivo e produção de fitormônio pela bactéria
Existem evidências de que pastagens formadas por algumas espécies do gênero Brachiaria poderiam beneficiar-se com o processo de fixação biológica do nitrogênio atmosférico (FBN), garantindo a estas pastagens maior longevidade. Dentre as bactérias diazotróficas encontradas em associação com estas gramíneas forrageiras, destaca-se a espécie Azosp
Revista Brasileira de Ciência do Solo. Publicado em: 2004-02
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26. Root colonization of wheat genotypes by diazotrophic bacteria under nitrogen fertilizer addition. / Atividade microbiana do solo e a interação de diazotróficos endofíticos e fungos micorrízicos arbusculares na cultura do trigo.
A pesquisa sobre bactérias diazotróficas associadas à cultura do trigo tem demonstrado a necessidade de associar bactérias eficientes a genótipos responsivos ao nitrogênio, os quais mais se beneficiariam dessa associação. Em um experimento com parcelas subdivididas instalado em condições de campo, em Mococa (SP), empregando os tratamentos: 3 doses
Publicado em: 2002
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27. Ocorrência de bactérias diazotróficas em diferentes genótipos de cana-de-açúcar
O objetivo deste trabalho foi avaliar a localização e o número de bactérias endofíticas em quatro genótipos de cana-de-açúcar e investigar sobre a possível existência de correlação com os resultados apresentados em trabalhos de quantificação da fixação biológica de nitrogênio (FBN). Fez-se um levantamento das bactérias diazotróficas prese
Pesquisa Agropecuária Brasileira. Publicado em: 2000-05
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28. Produtividade do milho em resposta à aplicação de nitrogênio e inoculação das sementes com Azospirillum spp
Em experimento de campo, nas condições de plantio direto em Latossolo Vermelho eutroférrico de fertilidade média a alta, foram testados para o milho (Zea mays, cv. G-159 S da Ciba Sementes) no período de outubro/1997 a março/1998, o aumento de produtividade de grãos, o comprimento de espiga, a altura de plantas e o número de linhas de grão por espig
Revista Brasileira de Engenharia Agrícola e Ambiental. Publicado em: 2000-04
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29. Improved Medium for Isolation of Azospirillum spp
Colonies of Azospirillum spp. could be readily distinguished from colonies of other diazotrophs by scarlet coloration in culture media in which Congo red was included.
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30. Chemotaxis of Azospirillum Species to Aromatic Compounds
Chemotaxis of Azospirillum lipoferum Sp 59b and Azospirillum brasilense Sp 7 and Sp CD to malate and to the aromatic substrates benzoate, protocatechuate, 4-hydroxybenzoate, and catechol was assayed by the capillary method and direct cell counts. A. lipoferum required induction by growth on 4-hydroxybenzoate for positive chemotaxis to this compound. Chemotax
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31. Aerotactic response of Azospirillum brasilense.
Five strains of Azospirillum brasilense and two of Azospirillum spp., from Israel, responded to self-created and preformed oxygen gradients by forming aerotactic bands in capillary tubes and actively moving toward a specific zone with low dissolved oxygen. Increasing the oxygen concentration in capillaries containing phosphate buffer increased the number of
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32. Influence of amino acids on nitrogen fixation ability and growth of Azospirillum spp.
The utilization of amino acids for growth and their effects on nitrogen fixation differ greatly among the several strains of each species of Azospirillum spp. that were examined. A. brasiliense grew poorly or not at all on glutamate, aspartate, serine, or histidine as the sole nitrogen and carbon sources. Nitrogen fixation by most A. brasiliense strains was
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33. Comparison of Two Cellulomonas Strains and Their Interaction with Azospirillum brasilense in Degradation of Wheat Straw and Associated Nitrogen Fixation
A mutant strain of Cellulomonas sp. CS1-17 was compared with Cellulomonas gelida 2480 as the cellulolytic component of a mixed culture which was responsible for the breakdown of wheat straw to support asymbiotic nitrogen fixation by Azospirillum brasilense Sp7 (ATCC 29145). Cellulomonas sp. strain CSI-17 was more efficient than was C. gelida in cellulose bre
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34. Strain-specific chemotaxis of Azospirillum spp.
Chemotactic responses of three Azospirillum strains originating from different host plants were compared to examine the possible role of chemotaxis in the adaptation of these bacteria to their respective hosts. The chemotaxis to several sugars, amino acids, and organic acids was determined qualitatively by an agar plate assay and quantitatively by a channele
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35. Increase in Dry Weight and Total Nitrogen Content in Zea mays and Setaria italica Associated with Nitrogen-fixing Azospirillum spp. 1
The association between nitrogen-fixing bacteria from the genus Azospirillum and the grasses Zea mays and Setaria italica was investigated in sterilized Leonard-jar assemblies. Nitrogen-fixing bacteria isolated from Cynodon dactylon roots in Israel and Azospirillum brasilense (Sp-7, Sp-80, and Cd) were examined. C2H2 reduction activity was detected in system
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36. Close Association of Azospirillum and Diazotrophic Rods with Different Root Zones of Kallar Grass
The populations of diazotrophic and nondiazotrophic bacteria were estimated in the endorhizosphere and on the rhizoplane of Kallar grass (Leptochloa fusca) and in nonrhizosphere soil. Microaerophilic diazotrophs were counted by the most-probable-number method, using two semisolid malate media, one of them adapted to the saline-sodic Kallar grass soil. Plate