Base de dados : LILACS
Pesquisa : B01.650 [Categoria DeCS]
Referências encontradas : 965 [refinar]
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Texto completo SciELO Brasil
Melo, Vânia Maria Maciel
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Id: biblio-1039267
Autor: Araujo, Ademir Sergio Ferreira de; Mendes, Lucas Wiliam; Bezerra, Walderly Melgaço; Nunes, Luis Alfredo Pinheiro Leal; Lyra, Maria do Carmo Catanho Pereira de; Figueiredo, Marcia do Vale Barreto; Melo, Vania Maria Maciel.
Título: Archaea diversity in vegetation gradients from the Brazilian Cerrado
Fonte: Braz. j. microbiol;49(3):522-528, July-Sept. 2018. tab, graf.
Idioma: en.
Projeto: FAPEPI/CNPq.
Resumo: Abstract We used 16S rRNA sequencing to assess the archaeal communities across a gradient of Cerrado. The archaeal communities differed across the gradient. Crenarcheota was the most abundant phyla, with Nitrosphaerales and NRPJ as the predominant classes. Euryachaeota was also found across the Cerrado gradient, including the classes Metanocellales and Methanomassiliicoccaceae.
Descritores: Plantas/microbiologia
Microbiologia do Solo
Archaea/isolamento & purificação
-Filogenia
Plantas/classificação
Solo/química
Brasil
Archaea/classificação
Archaea/crescimento & desenvolvimento
Archaea/genética
Biodiversidade
Desenvolvimento Vegetal
Responsável: BR1.1 - BIREME


  2 / 965 LILACS  
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Id: biblio-839326
Autor: Braga, Raíssa Mesquita; Dourado, Manuella Nóbrega; Araújo, Welington Luiz.
Título: Microbial interactions: ecology in a molecular perspective
Fonte: Braz. j. microbiol;47(supl.1):86-98, Oct.-Dec. 2016. tab.
Idioma: en.
Projeto: Foundation for Research Assistance; . FAPESP; . CNPq.
Resumo: ABSTRACT The microorganism-microorganism or microorganism-host interactions are the key strategy to colonize and establish in a variety of different environments. These interactions involve all ecological aspects, including physiochemical changes, metabolite exchange, metabolite conversion, signaling, chemotaxis and genetic exchange resulting in genotype selection. In addition, the establishment in the environment depends on the species diversity, since high functional redundancy in the microbial community increases the competitive ability of the community, decreasing the possibility of an invader to establish in this environment. Therefore, these associations are the result of a co-evolution process that leads to the adaptation and specialization, allowing the occupation of different niches, by reducing biotic and abiotic stress or exchanging growth factors and signaling. Microbial interactions occur by the transference of molecular and genetic information, and many mechanisms can be involved in this exchange, such as secondary metabolites, siderophores, quorum sensing system, biofilm formation, and cellular transduction signaling, among others. The ultimate unit of interaction is the gene expression of each organism in response to an environmental (biotic or abiotic) stimulus, which is responsible for the production of molecules involved in these interactions. Therefore, in the present review, we focused on some molecular mechanisms involved in the microbial interaction, not only in microbial-host interaction, which has been exploited by other reviews, but also in the molecular strategy used by different microorganisms in the environment that can modulate the establishment and structuration of the microbial community.
Descritores: Plantas/microbiologia
Ecologia
Interações Hospedeiro-Patógeno
Interações Microbianas
Microbiota
-Microbiologia do Solo
Percepção de Quorum
Metabolismo Secundário
Limites: Animais
Responsável: BR1.1 - BIREME


  3 / 965 LILACS  
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Id: lil-788954
Autor: Akbar, Shamsa; Sultan, Sikander.
Título: Soil bacteria showing a potential of chlorpyrifos degradation and plant growth enhancement
Fonte: Braz. j. microbiol;47(3):563-570, July-Sept. 2016. tab, graf.
Idioma: en.
Resumo: ABSTRACT Background: Since 1960s, the organophosphate pesticide chlorpyrifos has been widely used for the purpose of pest control. However, given its persistence and toxicity towards life forms, the elimination of chlorpyrifos from contaminated sites has become an urgent issue. For this process bioremediation is the method of choice. Results: Two bacterial strains, JCp4 and FCp1, exhibiting chlorpyrifos-degradation potential were isolated from pesticide contaminated agricultural fields. These isolates were able to degrade 84.4% and 78.6% of the initial concentration of chlorpyrifos (100 mg L-1) within a period of only 10 days. Based on 16S rRNA sequence analysis, these strains were identified as Achromobacter xylosoxidans (JCp4) and Ochrobactrum sp. (FCp1). These strains exhibited the ability to degrade chlorpyrifos in sterilized as well as non-sterilized soils, and were able to degrade 93-100% of the input concentration (200 mg kg-1) within 42 days. The rate of degradation in inoculated soils ranged from 4.40 to 4.76 mg-1 kg-1 d-1 with rate constants varying between 0.047 and 0.069 d-1. These strains also displayed substantial plant growth promoting traits such as phosphate solubilization, indole acetic acid production and ammonia production both in absence as well as in the presence of chlorpyrifos. However, presence of chlorpyrifos (100 and 200 mg L-1) was found to have a negative effect on indole acetic acid production and phosphate solubilization with percentage reduction values ranging between 2.65-10.6% and 4.5-17.6%, respectively. Plant growth experiment demonstrated that chlorpyrifos has a negative effect on plant growth and causes a decrease in parameters such as percentage germination, plant height and biomass. Inoculation of soil with chlorpyrifos-degrading strains was found to enhance plant growth significantly in terms of plant length and weight. Moreover, it was noted that these strains degraded chlorpyrifos at an increased rate (5.69 mg-1 kg-1 d-1) in planted soil. Conclusion The results of this study clearly demonstrate that the chlorpyrifos-degrading strains have the potential to develop into promising candidates for raising the productivity of crops in pesticide contaminated soils.
Descritores: Plantas/microbiologia
Bactérias/classificação
Bactérias/metabolismo
Fenômenos Fisiológicos Vegetais
Fenômenos Fisiológicos Bacterianos
Clorpirifos/metabolismo
-Fenótipo
Reguladores de Crescimento de Planta/biossíntese
Microbiologia do Solo
Bactérias/crescimento & desenvolvimento
Biodegradação Ambiental
Responsável: BR1.1 - BIREME


  4 / 965 LILACS  
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Id: lil-780839
Autor: Borges, Wardsson Lustrino; Prin, Yves; Ducousso, Marc; Le Roux, Christine; Faria, Sergio Miana de.
Título: Rhizobial characterization in revegetated areas after bauxite mining
Fonte: Braz. j. microbiol;47(2):314-321, Apr.-June 2016. tab, graf.
Idioma: en.
Projeto: National Council for Scientific and Technological Development; . IBAMA.
Resumo: Abstract Little is known regarding how the increased diversity of nitrogen-fixing bacteria contributes to the productivity and diversity of plants in complex communities. However, some authors have shown that the presence of a diverse group of nodulating bacteria is required for different plant species to coexist. A better understanding of the plant symbiotic organism diversity role in natural ecosystems can be extremely useful to define recovery strategies of environments that were degraded by human activities. This study used ARDRA, BOX-PCR fingerprinting and sequencing of the 16S rDNA gene to assess the diversity of root nodule nitrogen-fixing bacteria in former bauxite mining areas that were replanted in 1981, 1985, 1993, 1998, 2004 and 2006 and in a native forest. Among the 12 isolates for which the 16S rDNA gene was partially sequenced, eight, three and one isolate(s) presented similarity with sequences of the genera Bradyrhizobium, Rhizobium and Mesorhizobium, respectively. The richness, Shannon and evenness indices were the highest in the area that was replanted the earliest (1981) and the lowest in the area that was replanted most recently (2006).
Descritores: Microbiologia do Solo
Bactérias/isolamento & purificação
-Filogenia
Plantas/microbiologia
Solo/química
Bactérias/classificação
Bactérias/genética
Óxido de Alumínio/análise
Mineração
Responsável: BR1.1 - BIREME


  5 / 965 LILACS  
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Id: biblio-965766
Autor: Mereles, María Fátima; Degen, Rosa; Ortíz, Mirtha.
Título: La diversidad florística del Macizo Acahay, Paraguarí, Paraguay / The floristic diversity of Macizo Acahay, Paraguarí, Paraguay
Fonte: Rojasiana;2(2):129-163, 1994.
Idioma: es.
Descritores: Plantas/classificação
Florestas
Pradaria
Zonas Úmidas
-Paraguai
Responsável: PY37.1 - Biblioteca


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Id: biblio-965737
Autor: Degen, Rosa; Mereles, María Fátima; Ortíz, Mirtha.
Título: Macizo Acahay: estudio fitosociológico de un área boscosa / Macizo Acahay: phytosociological study of a wooded area
Fonte: Rojasiana;6(1):81-93, 2004.
Idioma: es.
Descritores: Plantas
Florestas
-Paraguai
Solo
Responsável: PY37.1 - Biblioteca


  7 / 965 LILACS  
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Id: biblio-964671
Autor: Mereles, Fátima; Degen, Rosa.
Título: Los nombres vulgares de los árboles y arbustos del Chaco Boreal, Paraguay / The vulgar names of the trees and shrubs of the Chaco Boreal, Paraguay
Fonte: Rojasiana;2(2):67-101, 1994.
Idioma: es.
Descritores: Árvores/classificação
-Paraguai
Plantas/classificação
Responsável: PY37.1 - Biblioteca


  8 / 965 LILACS  
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Id: biblio-964525
Autor: Degen, Rosa; Mereles, Fátima.
Título: Check-List de las plantas colectadas en el Chaco Boreal, Paraguay / Check-List de las plantas colectadas en el Chaco Boreal, Paraguay
Fonte: Rojasiana;3(1):1-175, 1996.
Idioma: es.
Descritores: Plantas/classificação
Líquens/classificação
-Paraguai
Magnoliopsida/classificação
Traqueófitas/classificação
Responsável: PY37.1 - Biblioteca


  9 / 965 LILACS  
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Id: biblio-963625
Autor: Basualdo, Isabel; Zardini, Elsa M; Soria, Nélida; Ortiz, Mirtha.
Título: Catálogo de la flora vascular del Cerro Palacios, Dpto. Paraguarí, Paraguay / Catalog of the vascular flora of Cerro Palacios, Department Paraguarí, Paraguay
Fonte: Rojasiana;2(2):102-128, 1994.
Idioma: es.
Descritores: Plantas/classificação
Flora/classificação
-Paraguai
Árvores/classificação
Responsável: PY37.1 - Biblioteca


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Id: biblio-948773
Autor: Degen, Rosa; Zardini, Elsa M; Basualdo, Isabel.
Título: Catálogo de la flora vascular de la meseta ybytu silla serranía de Tobati, Departamento de Cordillera, Paraguay / Catalog of vascular flora of the plateau Ybytu silla Serrania de tobati, Department of Cordillera, Paraguay
Fonte: Rojasiana;6(1):7-42, 2004.
Idioma: es.
Descritores: Florestas
Flora/classificação
Magnoliopsida/classificação
Traqueófitas/classificação
-Paraguai
Plantas/classificação
Responsável: BR1.1 - BIREME



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