Consulta: creatorFacets:"Florentino,Ligiane Aparecida"
Registros recuperados: 10
Data/hora: 09/06/2024 05:59:20

Diversidade de bactérias que nodulam siratro em três sistemas de uso da terra da Amazônia Ocidental
Provedor de dados: 86
Autores: Jesus,Ederson da Conceição; Moreira,Fátima Maria de Souza; Florentino,Ligiane Aparecida; Rodrigues,Maria Isabel Dantas; Oliveira,Marcelo Silva de.
O objetivo deste trabalho foi verificar o efeito de três sistemas de uso da terra da Amazônia Ocidental sobre a diversidade fenotípica de bactérias que nodulam siratro. Os sistemas estudados foram cultivo de mandioca, cultivo de pupunheira e floresta de terra firme. As densidades de bactérias foram avaliadas pela técnica do número mais provável, pela inoculação de suspensões de solo diluídas em siratro (Macroptilium atropurpureum), e foram semelhantes nas áreas estudadas. Foram caracterizados 257 isolados, provenientes dos nódulos de siratro, os quais formaram 63 grupos culturais a 80% de similaridade. Poucos isolados foram obtidos a partir de solo sob floresta, enquanto um maior número de isolados foi obtido nas áreas cultivadas. A diversidade pelo índice...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rizóbio; Macroptilium atropurpureum; Densidade; Caracterização cultural.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000800006

Bactérias diazotróficas em solos sob seringueira
Provedor de dados: 90
Autores: Diniz,Patricia Fabian de Araújo; Oliveira,Luiz Edson Mota de; Lopes,Noelly Alves; Florentino,Ligiane Aparecida; Carvalho,Teotonio Soares de; Moreira,Fatima Maria de Souza.
Diversos relatos evidenciam os benefícios de procariotos fixadores de nitrogênio atmosférico no crescimento e na nutrição de muitas espécies vegetais; entretanto, não há, até o momento, nenhum trabalho visando à prospecção desses microrganismos na rizosfera da seringueira (Hevea brasiliensis). Assim, os objetivos deste trabalho foram verificar a ocorrência de bactérias diazotróficas em solos sob plantio de seringueira, assim como em suas raízes, e isolar e caracterizar essas bactérias. Para essa finalidade, coletaram-se amostras de solo e de raízes finas de seringueiras cultivadas no Campus Experimental da Universidade Federal de Lavras (Lavras, MG) para inoculação em meios de cultura semissólidos sem N na forma combinada, de modo a favorecer o crescimento...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea; Diazotróficos; Fixação biológica de nitrogênio; Beijerinckia.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000500006

Diversity and efficiency of bradyrhizobium strains isolated from soil samples collected from around sesbania virgata roots using cowpea as trap species
Provedor de dados: 90
Autores: Florentino,Ligiane Aparecida; Sousa,Pedro Martins de; Silva,Jacqueline Savana; Silva,Karina Barroso; Moreira,Fatima Maria de Souza.
The genetic diversity of ten Bradyrhizobium strains was evaluated for tolerance to high temperatures, to different salinity levels and for the efficiency of symbiosis with cowpea plants (Vigna unguiculata (L.) Walp.). Eight of these strains were isolated from nodules that appeared on cowpea after inoculation with suspensions of soil sampled from around the root system of Sesbania virgata (wand riverhemp) in ecosystems of South Minas Gerais. The other two strains used in our analyses as references, were from the Amazon and are currently recommended as cowpea inoculants. Genetic diversity was analyzed by amplifying repetitive DNA elements with the BOX primer, revealing high genetic diversity with each strain presenting a unique band profile. Leonard jar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological N2 fixation; Selection; Inoculant strains; Phenotypic diversity; Genotypic diversity.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400011

Exopolysaccharides produced by the symbiotic nitrogen-fixing bacteria of leguminosae
Provedor de dados: 90
Autores: Bomfeti,Cleide Aparecida; Florentino,Ligiane Aparecida; Guimarães,Ana Paula; Cardoso,Patrícia Gomes; Guerreiro,Mário César; Moreira,Fatima Maria de Souza.
The process of biological nitrogen fixation (BNF), performed by symbiotic nitrogen fixing bacteria with legume species, commonly known as α and β rhizobia, provides high sustainability for the ecosystems. Its management as a biotechnology is well succeeded for improving crop yields. A remarkable example of this success is the inoculation of Brazilian soybeans with Bradyrhizobium strains. Rhizobia produce a wide diversity of chemical structures of exopolysaccharides (EPS). Although the role of EPS is relatively well studied in the process of BNF, their economic and environmental potential is not yet explored. These EPS are mostly species-specific heteropolysaccharides, which can vary according to the composition of sugars, their linkages in a single...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exopolysaccharides; Nodules; Environmental stress; Soil aggregation; Rhizobia.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300001

Replacement of aruana grass by gliricidia (Gliricidia sepium) on silage quality
Provedor de dados: 96
Autores: Massafera,Danilo Antonio; Florentino,Ligiane Aparecida; Rabelo,Carlos Henrique Silveira; Härter,Carla Joice; Rezende,Adauton Vilela de; Reis,Ricardo Andrade.
Our objective was to investigate the effect of the replacement of aruana grass by gliricidia on the fermentative losses, chemical composition, and aerobic stability of silages. For ensiling, whole-crop aruana grass (75 d of growth) was chopped (275 g kg-1 dry matter - DM) and ensiled alone or associated with gliricidia (270 g kg-1 DM; 150 d of growth). For gliricidia, we used only the leaves and stalks to ensile. The evaluated treatments were different ratios of aruana grass to gliricidia (100:0, 75:25, 50:50, 25:75, and 0:100), with four replicates (mini-silos). The silage composed only of gliricidia exhibited a lower pH than the other silages. Dry matter recovery was not affected by the treatments, although effluent losses were affected. The replacement...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestibility; Fermentative process; Fiber; Legumes; Tropical grass.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000700231

Symbiotic nitrogen-fixing bacterial populations trapped from soils under agroforestry systems in the Western Amazon
Provedor de dados: 63
Autores: Jaramillo,Paula Marcela Duque; Guimarães,Amanda Azarias; Florentino,Ligiane Aparecida; Silva,Karina Barroso; Nóbrega,Rafaela Simão Abrahão; Moreira,Fatima Maria de Souza.
Cowpea (Vigna unguiculata) is an important grain-producing legume that can forego nitrogen fertilization by establishing an efficient symbiosis with nitrogen-fixing bacteria. Although inoculating strains have already been selected for this species, little is known about the genotypic and symbiotic diversity of native rhizobia. Recently, Bradyrhizobium has been shown to be the genus most frequently trapped by cowpea in agricultural soils of the Amazon region. We investigated the genetic and symbiotic diversity of 148 bacterial strains with different phenotypic and cultural properties isolated from the nodules of the trap species cowpea, which was inoculated with samples from soils under agroforestry systems from the western Amazon. Sixty non-nodulating...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Legume-nodulating bacteria; Biodiversity; Symbiotic promiscuity; Chlorophyll content.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600004

Sesbania virgata stimulates the occurrence of its microsymbiont in soils but does not inhibit microsymbionts of other species
Provedor de dados: 63
Autores: Florentino,Ligiane Aparecida; Guimarães,Ana Paula; Rufini,Márcia; Silva,Krisle da; Moreira,Fátima Maria de Souza.
The legume species Sesbania virgata establishes a specific and efficient symbiosis with Azorhizobium doebereinerae. Previous studies have shown that A. doebereinerae occurrence correlates to the presence of S. virgata. This work aimed to evaluate the occurrence of A. doebereinerae and of other nitrogen-fixing Leguminosae-nodulating bacteria (NFLNB) in soil samples collected adjacent to and 10 m away from the stems of five S. virgata plants in pasture areas. Symbiotic characteristics of isolates from these NFLNB populations were also studied. S. virgata and the four promiscuous legume species Leucaena leucocephala, Macroptilium atropurpureum, Phaseolus vulgaris and Vigna unguiculata were inoculated with soil samples to trap A. doebereinerae and other NFLNB....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Azorhizobium; Cupriavidus; Leguminosae; Nodulation; Nitrogen-fixing species.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500012

Physiological and symbiotic diversity of Cupriavidus necator strains isolated from nodules of Leguminosae species
Provedor de dados: 63
Autores: Florentino,Ligiane Aparecida; Jaramillo,Paula Marcela Duque; Silva,Karina Barroso; Silva,Jacqueline Savana da; Oliveira,Silvia Maria de; Moreira,Fatima Maria de Souza.
Biological nitrogen fixation, performed by diazotrophic bacteria, plays an important role in the maintenance of agricultural systems, as it contributes with significant amounts of the nitrogen (N) needed for plant growth, totally or partially exempting the use of industrial N fertilisers. Twenty-five bacterial strains isolated from nodules of Leucaena leucocephala and Phaseolus vulgaris trap plants were studied. These nodules were formed after inoculation with suspensions of soil samples collected close to the root system of Sesbania virgata. In previous studies, these bacteria were identified as Cupriavidus necator. This study aimed to evaluate the ability of these strains to fix N2 in the free-living state and to use carbon (C) sources; their resistance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Symbiosis; Β-proteobacteria; Antibiotic resistance.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400003

Crescimento de Bradyrhizobium elkanii estirpe Br 29 em meios de cultivo com diferentes valores de pH inicial
Provedor de dados: 64
Autores: Barberi,Alexandre; Moreira,Fátima M. S.; Florentino,Ligiane Aparecida; Rodrigues,Maria Isabel D.
A soja, atualmente, é a leguminosa de maior expressão econômica no Brasil. Em razão da demanda crescente no mercado internacional, a cultura encontra-se em larga expansão em todo território brasileiro. Em alguns ensaios realizados em solos ácidos brasileiros, sob sistema de plantio direto, essa cultura tem mostrado baixa resposta à aplicação de calcário. Porém, a acidez é um dos fatores que limitam a eficiência da simbiose rizóbio-leguminosas. Para contornar esses problemas, poderiam ser utilizadas estirpes tolerantes à acidez do solo ou induzir tolerância nas estirpes já utilizadas. Em alguns trabalhos, tem-se demonstrado indução de tolerância à acidez quando a bactéria é previamente exposta a pH ácido. Assim, objetivou-se com este trabalho verificar o...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rizóbio; Acidez; Tempo de geração; Unidades formadoras de colônia; Densidade ótica.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542004000200021

Solubilization of Araxá natural phosphate and decomposition of plant residues by bacterial isolates
Provedor de dados: 64
Autores: Paredes Filho,Mário Viana; Silva,Adriano Bortolotti da; Florentino,Ligiane Aparecida.
ABSTRACT Brazil imports most of the phosphate fertilizers used in agriculture, however, it has national deposits in its territory that can supply part of the domestic market demand. In order of these to be used effectively, it is necessary to identify techniques to accelerate the release of phosphorus (P) from these rocks. The objective was to evaluate the influence of inoculation with phosphate solubilizing bacterial isolates (PSB) and decomposition of different plant residues in the solubilization of Araxá natural phosphate (ANP). Two experiments were carried out in a completely randomized design in a 5 x 4 factorial scheme, with four replicates. The first experiment evaluated the solubilization of ANP by PSB in culture medium with four different sources...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diazotrophic bacteria; Organic material; Phosphorus availability in soil; Soil microorganisms.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100221