|
|
|
| Registros recuperados: 35 | |
|
| |
|
|
| Souza,Rocheli de; Ambrosini,Adriana; Passaglia,Luciane M.P.. |
| Abstract Plant-microbe interactions in the rhizosphere are the determinants of plant health, productivity and soil fertility. Plant growth-promoting bacteria (PGPB) are bacteria that can enhance plant growth and protect plants from disease and abiotic stresses through a wide variety of mechanisms; those that establish close associations with plants, such as the endophytes, could be more successful in plant growth promotion. Several important bacterial characteristics, such as biological nitrogen fixation, phosphate solubilization, ACC deaminase activity, and production of siderophores and phytohormones, can be assessed as plant growth promotion (PGP) traits. Bacterial inoculants can contribute to increase agronomic efficiency by reducing production costs... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrogen fixation; Siderophore production; Plant-bacteria interaction; Inoculant; Rhizosphere. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000400401 |
| |
|
| |
|
| |
|
|
| Martínez-Viveros,O; Jorquera,M.A; Crowley,D.E; Gajardo,G; Mora,M.L. |
| Rhizobacteria are capable of stimulating plant growth through a variety of mechanisms that include improvement of plant nutrition, production and regulation of phytohormones, and suppression of disease causing organisms. While considerable research has demonstrated their potential utility, the successful application of plant growth promoting rhizobacteria (PGPR) in the field has been limited by a lack of knowledge of ecological factors that determine their survival and activity in the plant rhizosphere. To be effective, PGPR must maintain a critical population density of active cells. Inoculation with PGPR strains can temporarily enhance the population size, but inoculants often have poor survival and compete with indigenous bacteria for available growth... |
| Tipo: Journal article |
Palavras-chave: Agricultural inoculant; Phytohormone; Phytopathogen biocontrol; Plant nutrition; Rhizosphere. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100006 |
| |
|
|
| Brasil,Carlos; Matsumoto,Leopoldo Sussumu; Nogueira,Marco Antonio; Spago,Flavia Regina; Rampazo,Luís Gustavo; Cruz,Marcio Ferreira; Andrade,Galdino. |
| The objective of this work was to assess the effect of two strains of Bacillus thuringiensis var. kurstaki on sorghum rhizosphere microorganisms. The strains were HD1, that produces the bioinsecticidal protein, and 407, that is a mutant non-producer. The strains do not influence microbial population, but reduce plant growth and improve mycorrhizal colonization and free living fixing N2 community. |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Bioinsecticide; Sorgum; Rhizosphere; Biocontrol. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000500022 |
| |
|
|
| Hernández-León,R; Martínez-Trujillo,M; Valencia-Cantero,E; Santoyo,G. |
| Rhizospheric soil of wheat plants contains a high diversity of microorganisms, and therefore, comprises a large reservoir for discovering genes with diverse agro-biotechnological applications. In this work, we constructed an E. coli metagenomic library based on bacterial artificial chromosome (BAC) clones with large genomic inserts from metagenomic DNA from the rhizosphere of wheat plants. The average of the DNA cloned segments varies from 5 to 80 kb, with an average size of 38 kb. Random clones were end-sequenced and homology results showed that the clonation of metagenomic DNA codes mainly for metabolic and catalytic functions (40%), including amidohydrolase, hydrolase, peptidase, serine protease, endonuclease and exonuclease. Another interesting... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Metagenomics; Rhizosphere; Wheat. |
| Ano: 2012 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000100018 |
| |
|
|
| Huang,YC; Chen,H; Zhao,WJ; Li,WD; Yang,HY; Sun,Y; Wang,L; Cao,SH. |
| We conducted pot experiments on the cypress Thujopsis dolabrata (Linn. f.) Sieb. et Zucc. in order to study the interaction of silicon (Si) and root exudates on cadmium (Cd) bioavailability in the rhizosphere,. Each variety was planted with 100 mg/kg Cd and/or 400 mg/kg Si for 210 days. The results showed that adding Si increased Cd tolerance in T. dolabrata, but that the mechanism was specifical. In T. dolabrata, Si did not prevent Cd translocation from roots to shoots, and it significantly enhanced Cd accumulation without inhibiting growth. Moreover, Si mobilized Cd from the rhizospheric soil by stimulating phenolic exudation from the roots, suggesting that Cd-chelation combined with Si-induced phenolics were involved in Cd detoxification. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cadmium; Rhizosphere; Root exudation; Silicon; Thujopsis dolabrata. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000200016 |
| |
|
| |
|
|
| Velázquez-Sepúlveda,I; Orozco-Mosqueda,MC; Prieto-Barajas,CM; Santoyo,G. |
| Rhizospheric soil is one the largest reservoirs of microbial genetic diversity. Before conducting a large-scale metagenomic analysis of an environment, such as a rhizospheric soil, it is necessary to perform a pre-screening of the resident genetic diversity. In this study, we analyzed the bacterial diversity associated with the rhizosphere of wheat plants by PCR amplification, construction of a library and sequencing of 16S rDNA genes. Thirty OTUs were detected, including the Classes Alfaproteobacteria, Betaproteobacteria, Deltaproteobacteria, Gammaproteobateria, Actinobacteria, Bacilli, Clostridia and Uncultivable bacteria. Within the Gammaproteobacteria class, the genera Pseudomonas, Stenotrophomonas and Bacillus were the most abundant, since they... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacterial diversity; Rhizosphere; Wheat; 16S ribosomal genes. |
| Ano: 2012 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572012000100012 |
| |
|
|
| Marchi,Giuliano; Guilherme,Luiz Roberto Guimarães; Chang,Andrew C. |
| Synthetic root exudates were formulated based on the organic acid composition of root exudates derived from the rhizosphere of aseptically grown corn plants, pH of the rhizosphere, and the background chemical matrices of the soil solutions. The synthetic root exudates, which mimic the chemical conditions of the rhizosphere environment where soil-borne metals are dissolved and absorbed by plants, were used to extract metals from sewage-sludge treated soils 16 successive times. The concentrations of Zn, Cd, Ni, Cr, and Cu of the sludge-treated soil were 71.74, 0.21, 15.90, 58.12, and 37.44 mg kg-1, respectively. The composition of synthetic root exudates consisted of acetic, butyric, glutaric, lactic, maleic, propionic, pyruvic, succinic, tartaric, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Soil extractant; Organic acids; Rhizosphere; Root exudates. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400039 |
| |
|
|
| Boechat,Cácio Luiz; Quadros,Patricia Dörr de; Giovanella,Patrícia; Brito,Ana Clecia Campos; Carlos,Filipe Selau; Sá,Enilson Luiz Saccol de; Camargo,Flávio Anastácio de Oliveira. |
| ABSTRACT There is a complex interaction between various components of the soil ecosystem, including microbial biomass and soil chemical contaminants such as heavy metals and radionuclides, which may greatly affect the efficiency of bioremediation techniques. The aim of this study was to investigate microbial capacity to change pH, changes in the metal soluble-exchangeable fraction, and effects of initial heavy metal contents on soil samples in microbial solubilization/immobilization capacity. The soil samples used in this study were collected at a known metal-contaminated site. Three highly metal-resistant bacteria were isolated from rhizosphere soil samples collected on weed species identified as Senecio brasiliensis, Senecio leptolobus, and Baccharis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Trace elements; Bioremediation technology; Rhizosphere; Environmental contamination. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100514 |
| |
|
|
| Fortes Neto,Paulo; Fortes,Nara Lúcia Perondi; Silva,Eliana Maria de Araújo Mariano da; Brambatti,Fabiana. |
| ABSTRACT Studies on the survival of pathogenic microorganisms in the soil after use of wastewater for fertilization of agricultural crops report the effects of moisture, pH, organic matter, and soil temperature on microorganisms. There are few studies that assess the survival of these microorganisms in the rhizosphere of plants fertilized with wastewater. Thus, the aim of this study was to quantify the number of fecal coliforms and rhizobacteria (fluorescent Pseudomonas spp., Bacillus spp,) in the rhizosphere of winter and summer crops fertilized with wastewater. In the experiment, we used 20 plots, and each plot occupied an area of 200 m2. The treatments used in the winter crop consisted of uncultivated plots and single crops of wheat, triticale, black... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rhizosphere; Reclaimed water; Wastewater. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100414 |
| |
|
|
| Castoldi,Gustavo; Reis,Jhônatas Gomes dos; Pivetta,Laércio Augusto; Rosolem,Ciro Antonio. |
| Brachiaria species, particularly B. humidicola, can synthesize and release compounds from their roots that inhibit nitrification, which can lead to changes in soil nitrogen (N) dynamics, mainly in N-poor soils. This may be important in crop-livestock integration systems, where brachiarias are grown together with or in rotation with grain crops. The objective of the present study was to determine whether this holds true in N-rich environments and if other Brachiaria species have the same effect. The soil N dynamics were evaluated after the desiccation of the species B. brizantha, B. decumbens, B. humidicola, and B. ruziziensis, which are widely cultivated in Brazil. The plants were grown in pots with a dystroferric Red Latosol in a greenhouse. Sixty days... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria brizantha; Brachiaria decumbens; Brachiaria humidicola; Brachiaria ruziziensis; Nitrification; Rhizosphere. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000600018 |
| |
|
| |
|
| |
|
|
| Andreote,Fernando Dini; Gumiere,Thiago; Durrer,Ademir. |
| A plethora of microbial cells is present in every gram of soil, and microbes are found extensively in plant and animal tissues. The mechanisms governed by microorganisms in the regulation of physiological processes of their hosts have been extensively studied in the light of recent findings on microbiomes. In plants, the components of these microbiomes may form distinct communities, such as those inhabiting the plant rhizosphere, the endosphere and the phyllosphere. In each of these niches, the "microbial tissue" is established by, and responds to, specific selective pressures. Although there is no clear picture of the overall role of the plant microbiome, there is substantial evidence that these communities are involved in disease control, enhance... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microbial communities; Rhizosphere; Endophytes; Phyllosphere. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600013 |
| |
|
| |
|
|
| Sun,Jianbo; Zou,Liangping; Li,Wenbin; Wang,Yuguang; Xia,Qiyu; Peng,Ming. |
| ABSTRACT: The impacts of continuous cropping of banana on soil microbiological and biochemical properties are little understood. In this study, we evaluated the variations in soil bacterial community abundance and diversity, microbial biomass carbon (MBC) and nitrogen (MBN) as well as soil enzyme activities involved in C, N and P cycles as affected by continuous cropping of banana. An initial increase in bacterial 16S rRNA copy and soil microbial biomass was observed in the second cropping and then decreased until the fourth cropping. The diversity of bacterial community showed a continuous decrease throughout the experiment. In addition, continuous cropping of banana caused shifts in bacterial community composition and structures. Soil urease and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rhizosphere; Soil bacterial abundance; Bacterial community diversity; Soil microbial biomass; Soil enzymes. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500420 |
| |
|
| |
| Registros recuperados: 35 | |
|
|
|
