Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.912.250.822.055 [Categoria DeCS]
Referências encontradas : 58 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 6 ir para página                

  1 / 58 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28211151
[Au] Autor:Smith AB; Alsdurf J; Knapp M; Baer SG; Johnson LC
[Ad] Endereço:Center for Conservation and Sustainable Development, Missouri Botanical Garden, St Louis, MO, USA.
[Ti] Título:Phenotypic distribution models corroborate species distribution models: A shift in the role and prevalence of a dominant prairie grass in response to climate change.
[So] Source:Glob Chang Biol;23(10):4365-4375, 2017 Oct.
[Is] ISSN:1365-2486
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Phenotypic distribution within species can vary widely across environmental gradients but forecasts of species' responses to environmental change often assume species respond homogenously across their ranges. We compared predictions from species and phenotype distribution models under future climate scenarios for Andropogon gerardii, a widely distributed, dominant grass found throughout the central United States. Phenotype data on aboveground biomass, height, leaf width, and chlorophyll content were obtained from 33 populations spanning a ~1000 km gradient that encompassed the majority of the species' environmental range. Species and phenotype distribution models were trained using current climate conditions and projected to future climate scenarios. We used permutation procedures to infer the most important variable for each model. The species-level response to climate was most sensitive to maximum temperature of the hottest month, but phenotypic variables were most sensitive to mean annual precipitation. The phenotype distribution models predict that A. gerardii could be largely functionally eliminated from where this species currently dominates, with biomass and height declining by up to ~60% and leaf width by ~20%. By the 2070s, the core area of highest suitability for A. gerardii is projected to shift up to ~700 km northeastward. Further, short-statured phenotypes found in the present-day short grass prairies on the western periphery of the species' range will become favored in the current core ~800 km eastward of their current location. Combined, species and phenotype models predict this currently dominant prairie grass will decline in prevalence and stature. Thus, sourcing plant material for grassland restoration and forage should consider changes in the phenotype that will be favored under future climate conditions. Phenotype distribution models account for the role of intraspecific variation in determining responses to anticipated climate change and thereby complement predictions from species distributions models in guiding climate adaptation strategies.
[Mh] Termos MeSH primário: Andropogon
Mudança Climática
Pradaria
Poaceae
[Mh] Termos MeSH secundário: Prevalência
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171023
[Lr] Data última revisão:
171023
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170218
[St] Status:MEDLINE
[do] DOI:10.1111/gcb.13666


  2 / 58 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27976469
[Au] Autor:Le Gall H; Fontaine JX; Molinié R; Pelloux J; Mesnard F; Gillet F; Fliniaux O
[Ad] Endereço:EA3900-BIOPI, Biologie des Plantes et Innovation, Université de Picardie Jules Verne, 80039, Amiens, France.
[Ti] Título:NMR-based Metabolomics to Study the Cold-acclimation Strategy of Two Miscanthus Genotypes.
[So] Source:Phytochem Anal;28(1):58-67, 2017 Jan.
[Is] ISSN:1099-1565
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:INTRODUCTION: Abiotic stress is a major cause of yield loss in plant culture. Miscanthus, a perennial C4 grass, is now considered a major source of renewable energy, especially for biofuel production. During the first year of planting in Northern Europe, Miscanthus was exposed to frost temperature, which generated high mortality in young plants and large loss of yield. One strategy to avoid such loss is to apply cold-acclimation, which confers on plants a better resistance to low temperature. OBJECTIVES: The aim of this study is to describe the effect of a cold-acclimation period on the metabolome of two Miscanthus genotypes that vary in their frost sensitivity at the juvenile stage. Miscanthus × giganteus (GIG) is particularly sensitive to frost, whereas Miscanthus sinensis August Feder (AUG) is tolerant. MATERIALS AND METHODS: Polar metabolite extraction was performed on Miscanthus, grown in non-acclimated or cold-acclimated conditions. Extracts were analysed by H-NMR followed by multivariate statistical analysis. Discriminant metabolites were identified. RESULTS: More than 40 metabolites were identified in the two Miscanthus genotypes. GIG and AUG showed a different metabolic background before cold treatment, probably related to their genetic background. After cold-acclimation, GIG and AUG metabolomes remained different. The tolerant genotype showed notably higher levels of accumulation in proline, sucrose and maltose when subjected to cold. CONCLUSION: These two genotypes seem to have a different adaptation strategy in cold conditions. The studied change in the metabolome concerns different types of molecules related to the cold-tolerant behaviour of Miscanthus. Copyright © 2016 John Wiley & Sons, Ltd.
[Mh] Termos MeSH primário: Adaptação Fisiológica
Andropogon/metabolismo
Temperatura Baixa
Genótipo
Metabolômica
Espectroscopia de Prótons por Ressonância Magnética/métodos
[Mh] Termos MeSH secundário: Andropogon/genética
Andropogon/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170227
[Lr] Data última revisão:
170227
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161216
[St] Status:MEDLINE
[do] DOI:10.1002/pca.2649


  3 / 58 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27259078
[Au] Autor:Khrunyk Y; Schiewer S; Carstens KL; Hu D; Coats JR
[Ad] Endereço:a Department of Civil and Environmental Engineering , University of Alaska Fairbanks , Fairbanks , AK , USA.
[Ti] Título:Uptake of C -atrazine by prairie grasses in a phytoremediation setting.
[So] Source:Int J Phytoremediation;19(2):104-112, 2017 Feb.
[Is] ISSN:1549-7879
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Agrochemicals significantly contribute to environmental pollution. In the USA, atrazine is a widely used pesticide and commonly found in rivers, water systems, and rural wells. Phytoremediation can be a cost-effective means of removing pesticides from soil. The objective of this project was to investigate the ability of prairie grasses to remove atrazine. C-labeled atrazine was added to sterilized sand and water/nutrient cultures, and the analysis was performed after 21 days. Switchgrass and big bluestem were promising species for phytoremediation, taking up about 40% of the applied [ C] in liquid hydroponic cultures, and between 20% and 33% in sand cultures. Yellow Indiangrass showed low resistance to atrazine toxicity and low uptake of [ C] atrazine in liquid hydroponic cultures. Atrazine degradation increased progressively from sand to roots and leaves. Most atrazine taken up by prairie grasses from sand culture was degraded to metabolites, which accounted for 60-80% of [ C] detected in leaves. Deisopropylatrazine (DIA) was the main metabolite detected in sand and roots, whereas in leaves further metabolism took place, forming increased amounts of didealkylatrazine (DDA) and an unidentified metabolite. In conclusion, prairie grasses achieved high atrazine removal and degradation, showing a high potential for phytoremediation.
[Mh] Termos MeSH primário: Atrazina/metabolismo
Herbicidas/metabolismo
Poaceae/metabolismo
Poluentes do Solo/metabolismo
[Mh] Termos MeSH secundário: Andropogon/metabolismo
Biodegradação Ambiental
Pradaria
Panicum/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Herbicides); 0 (Soil Pollutants); QJA9M5H4IM (Atrazine)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170406
[Lr] Data última revisão:
170406
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160604
[St] Status:MEDLINE
[do] DOI:10.1080/15226514.2016.1193465


  4 / 58 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27466055
[Au] Autor:McAllister CA; Miller AJ
[Ad] Endereço:Department of Biology and Natural Resources, Principia College, Elsah, Illinois 62028 USA chrissy.mcallister@principia.edu.
[Ti] Título:Single nucleotide polymorphism discovery via genotyping by sequencing to assess population genetic structure and recurrent polyploidization in Andropogon gerardii.
[So] Source:Am J Bot;103(7):1314-25, 2016 07.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Autopolyploidy, genome duplication within a single lineage, can result in multiple cytotypes within a species. Geographic distributions of cytotypes may reflect the evolutionary history of autopolyploid formation and subsequent population dynamics including stochastic (drift) and deterministic (differential selection among cytotypes) processes. Here, we used a population genomic approach to investigate whether autopolyploidy occurred once or multiple times in Andropogon gerardii, a widespread, North American grass with two predominant cytotypes. METHODS: Genotyping by sequencing was used to identify single nucleotide polymorphisms (SNPs) in individuals collected from across the geographic range of A. gerardii. Two independent approaches to SNP calling were used: the reference-free UNEAK pipeline and a reference-guided approach based on the sequenced Sorghum bicolor genome. SNPs generated using these pipelines were analyzed independently with genetic distance and clustering. KEY RESULTS: Analyses of the two SNP data sets showed very similar patterns of population-level clustering of A. gerardii individuals: a cluster of A. gerardii individuals from the southern Plains, a northern Plains cluster, and a western cluster. Groupings of individuals corresponded to geographic localities regardless of cytotype: 6x and 9x individuals from the same geographic area clustered together. CONCLUSIONS: SNPs generated using reference-guided and reference-free pipelines in A. gerardii yielded unique subsets of genomic data. Both data sets suggest that the 9x cytotype in A. gerardii likely evolved multiple times from 6x progenitors across the range of the species. Genomic approaches like GBS and diverse bioinformatics pipelines used here facilitate evolutionary analyses of complex systems with multiple ploidy levels.
[Mh] Termos MeSH primário: Andropogon/genética
Genética Populacional
Genoma de Planta/genética
Genômica
Polimorfismo de Nucleotídeo Único/genética
[Mh] Termos MeSH secundário: Evolução Biológica
Análise por Conglomerados
Genótipo
Geografia
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1707
[Cu] Atualização por classe:171121
[Lr] Data última revisão:
171121
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160729
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1600146


  5 / 58 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27142168
[Au] Autor:Haddix ML; Paul EA; Cotrufo MF
[Ad] Endereço:Natural Resource Ecology Laboratory, Colorado State University, 200 West Lake Street, Fort Collins, CO, 80523-1499, USA.
[Ti] Título:Dual, differential isotope labeling shows the preferential movement of labile plant constituents into mineral-bonded soil organic matter.
[So] Source:Glob Chang Biol;22(6):2301-12, 2016 Jun.
[Is] ISSN:1365-2486
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The formation and stabilization of soil organic matter (SOM) are major concerns in the context of global change for carbon sequestration and soil health. It is presently believed that lignin is not selectively preserved in soil and that chemically labile compounds bonding to minerals comprise a large fraction of the SOM. Labile plant inputs have been suggested to be the main precursor of the mineral-bonded SOM. Litter decomposition and SOM formation are expected to have temperature sensitivity varying with the lability of plant inputs. We tested this framework using dual (13) C and (15) N differentially labeled plant material to distinguish the metabolic and structural components within a single plant material. Big Bluestem (Andropogon gerardii) seedlings were grown in an enriched (13) C and (15) N environment and then prior to harvest, removed from the enriched environment and allowed to incorporate natural abundance (13) C-CO2 and (15) N fertilizer into the metabolic plant components. This enabled us to achieve a greater than one atom % difference in (13) C between the metabolic and structural components within the plant litter. This differentially labeled litter was incubated in soil at 15 and 35 °C, for 386 days with CO2 measured throughout the incubation. After 14, 28, 147, and 386 days of incubation, the soil was subsequently fractionated. There was no difference in temperature sensitivity of the metabolic and structural components with regard to how much was respired or in the amount of litter biomass stabilized. Only the metabolic litter component was found in the sand, silt, or clay fraction while the structural component was exclusively found in the light fraction. These results support the stabilization framework that labile plant components are the main precursor of mineral-associated organic matter.
[Mh] Termos MeSH primário: Andropogon/química
Minerais/química
Solo/química
[Mh] Termos MeSH secundário: Dióxido de Carbono/análise
Isótopos de Carbono/análise
Fertilizantes
Substâncias Húmicas
Marcação por Isótopo
Isótopos de Nitrogênio/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Carbon Isotopes); 0 (Fertilizers); 0 (Humic Substances); 0 (Minerals); 0 (Nitrogen Isotopes); 0 (Soil); 142M471B3J (Carbon Dioxide)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160505
[St] Status:MEDLINE
[do] DOI:10.1111/gcb.13237


  6 / 58 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:27120201
[Au] Autor:Palik DJ; Snow AA; Stottlemyer AL; Miriti MN; Heaton EA
[Ad] Endereço:Department of Evolution, Ecology, and Organismal Biology, The Ohio State University, Columbus, Ohio, United States of America.
[Ti] Título:Relative Performance of Non-Local Cultivars and Local, Wild Populations of Switchgrass (Panicum virgatum) in Competition Experiments.
[So] Source:PLoS One;11(4):e0154444, 2016.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The possibility of increased invasiveness in cultivated varieties of native perennial species is a question of interest in biofuel risk assessment. Competitive success is a key factor in the fitness and invasive potential of perennial plants, and thus the large-scale release of high-yielding biomass cultivars warrants empirical comparisons with local conspecifics in the presence of competitors. We evaluated the performance of non-local cultivars and local wild biotypes of the tallgrass species Panicum virgatum L. (switchgrass) in competition experiments during two growing seasons in Ohio and Iowa. At each location, we measured growth and reproductive traits (plant height, tiller number, flowering time, aboveground biomass, and seed production) of four non-locally sourced cultivars and two locally collected wild biotypes. Plants were grown in common garden experiments under three types of competition, referred to as none, moderate (with Schizachyrium scoparium), and high (with Bromus inermis). In both states, the two "lowland" cultivars grew taller, flowered later, and produced between 2x and 7.5x more biomass and between 3x and 34x more seeds per plant than local wild biotypes, while the other two cultivars were comparable to wild biotypes in these traits. Competition did not affect relative differences among biotypes, with the exception of shoot number, which was more similar among biotypes under high competition. Insights into functional differences between cultivars and wild biotypes are crucial for developing biomass crops while mitigating the potential for invasiveness. Here, two of the four cultivars generally performed better than wild biotypes, indicating that these biotypes may pose more of a risk in terms of their ability to establish vigorous feral populations in new regions outside of their area of origin. Our results support an ongoing assessment of switchgrass cultivars developed for large-scale planting for biofuels.
[Mh] Termos MeSH primário: Espécies Introduzidas
Panicum/crescimento & desenvolvimento
Dispersão Vegetal/fisiologia
Sementes/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Andropogon/crescimento & desenvolvimento
Biocombustíveis/provisão & distribuição
Bromus/crescimento & desenvolvimento
Conservação dos Recursos Naturais
Iowa
Ohio
Melhoramento Vegetal
Dispersão Vegetal/ética
Brotos de Planta/crescimento & desenvolvimento
Estações do Ano
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
0 (Biofuels)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170321
[Lr] Data última revisão:
170321
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160428
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0154444


  7 / 58 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:26919855
[Au] Autor:Raithel S; Johnson L; Galliart M; Brown S; Shelton J; Herndon N; Bello NM
[Ad] Endereço:Department of Statistics, Kansas State University, Manhattan, KS, USA. swraithel@gmail.com.
[Ti] Título:Inferential considerations for low-count RNA-seq transcripts: a case study on the dominant prairie grass Andropogon gerardii.
[So] Source:BMC Genomics;17:140, 2016 Feb 27.
[Is] ISSN:1471-2164
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Differential expression (DE) analysis of RNA-seq data still poses inferential challenges, such as handling of transcripts characterized by low expression levels. In this study, we use a plasmode-based approach to assess the relative performance of alternative inferential strategies on RNA-seq transcripts, with special emphasis on transcripts characterized by a small number of read counts, so-called low-count transcripts, as motivated by an ecological application in prairie grasses. Big bluestem (Andropogon gerardii) is a wide-ranging dominant prairie grass of ecological and agricultural importance to the US Midwest while edaphic subspecies sand bluestem (A. gerardii ssp. Hallii) grows exclusively on sand dunes. Relative to big bluestem, sand bluestem exhibits qualitative phenotypic divergence consistent with enhanced drought tolerance, plausibly associated with transcripts of low expression levels. Our dataset consists of RNA-seq read counts for 25,582 transcripts (60% of which are classified as low-count) collected from leaf tissue of individual plants of big bluestem (n = 4) and sand bluestem (n = 4). Focused on low-count transcripts, we compare alternative ad-hoc data filtering techniques commonly used in RNA-seq pipelines and assess the inferential performance of recently developed statistical methods for DE analysis, namely DESeq2 and edgeR robust. These methods attempt to overcome the inherently noisy behavior of low-count transcripts by either shrinkage or differential weighting of observations, respectively. RESULTS: Both DE methods seemed to properly control family-wise type 1 error on low-count transcripts, whereas edgeR robust showed greater power and DESeq2 showed greater precision and accuracy. However, specification of the degree of freedom parameter under edgeR robust had a non-trivial impact on inference and should be handled carefully. When properly specified, both DE methods showed overall promising inferential performance on low-count transcripts, suggesting that ad-hoc data filtering steps at arbitrary expression thresholds may be unnecessary. A note of caution is in order regarding the approximate nature of DE tests under both methods. CONCLUSIONS: Practical recommendations for DE inference are provided when low-count RNA-seq transcripts are of interest, as is the case in the comparison of subspecies of bluestem grasses. Insights from this study may also be relevant to other applications focused on transcripts of low expression levels.
[Mh] Termos MeSH primário: Andropogon/genética
Genômica/métodos
RNA de Plantas/genética
Análise de Sequência de RNA/métodos
Transcriptoma
[Mh] Termos MeSH secundário: Adaptação Fisiológica/genética
Fenótipo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
0 (RNA, Plant)
[Em] Mês de entrada:1609
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160228
[St] Status:MEDLINE
[do] DOI:10.1186/s12864-016-2442-7


  8 / 58 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
[PMID]:26594700
[Au] Autor:Mendola ML; Baer SG; Johnson LC; Maricle BR
[Ti] Título:The role of ecotypic variation and the environment on biomass and nitrogen in a dominant prairie grass.
[So] Source:Ecology;96(9):2433-45, 2015 Sep.
[Is] ISSN:0012-9658
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Knowledge of the relative strength of evolution and the environment on a phenotype is required to predict species responses to environmental change and decide where to source plant material for ecological restoration. This information is critically needed for dominant species that largely determine the productivity of the central U.S. grassland. We established a reciprocal common garden experiment across a longitudinal gradient to test whether ecotypic variation interacts with the environment to affect growth and nitrogen (N) storage in a dominant grass. We predicted plant growth would increase from west to east, corresponding with increasing precipitation, but differentially among ecotypes due to local adaptation in all ecotypes and a greater range of growth response in ecotypes originating from west to east. We quantified aboveground biomass, root biomass, belowground net primary production (BNPP), root C:N ratio, and N storage in roots of three ecotypes of Andropogon gerardii collected from and reciprocally planted in central Kansas, eastern Kansas, and s6uthern Illinois. Only the ecotype from the most mesic region (southern Illinois) exhibited more growth from west to east. There was evidence for local adaptation in the southern Illinois ecotype by means of the local vs. foreign contrast within a site and the home vs. away contrast when growth in southern Illinois was compared to the most distant 'site in central Kansas. Root biomass of the eastern Kansas ecotype was higher at home than at either away site. The ecotype from the driest region, central Kansas, exhibited the least response across the environmental gradient, resulting in a positive relationship between the range of biomass response and precipitation in ecotype region of origin. Across all sites, ecotypes varied in root C:N ratio (highest in the driest-origin ecotype) and N storage in roots (highest in the most mesic-origin ecotype). The low and limited range of biomass, higher C:N ratio of roots, and lower N storage in the central Kansas ecotype relative to the southern Illinois ecotype suggests that introducing ecotypes of A. gerardii from much drier regions into highly mesic prairie would reduce productivity and alter belowground ecosystem processes under a wide range of conditions.
[Mh] Termos MeSH primário: Andropogon/classificação
Andropogon/fisiologia
Ecossistema
Pradaria
Nitrogênio/metabolismo
[Mh] Termos MeSH secundário: Biomassa
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
N762921K75 (Nitrogen)
[Em] Mês de entrada:1512
[Cu] Atualização por classe:151120
[Lr] Data última revisão:
151120
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151124
[St] Status:MEDLINE


  9 / 58 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
[PMID]:26236898
[Au] Autor:Schlatter DC; Bakker MG; Bradeen JM; Kinkel LL
[Ti] Título:Plant community richness and microbial interactions structure bacterial communities in soil.
[So] Source:Ecology;96(1):134-42, 2015 Jan.
[Is] ISSN:0012-9658
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Plant species, plant community diversity and microbial interactions can significantly impact soil microbial communities, yet there are few data on the interactive effects of plant species and plant community diversity on soil bacterial communities. We hypothesized that plant species and plant community diversity affect soil bacterial communities by setting the context in which bacterial interactions occur. Specifically, we examined soil bacterial community composition and diversity in relation to plant "host" species, plant community richness, bacterial antagonists, and soil edaphic characteristics. Soil bacterial communities associated with four different prairie plant species (Andropogon gerardii, Schizachyrium scoparium, Lespedeza capitata, and' Lupinus perennis) grown in plant communities of increasing species richness (1, 4, 8, and 16 species) were sequenced. Additionally, soils were evaluated for populations of antagonistic bacteria and edaphic characteristics. Plant species effects on soil bacterial community composition were small and depended on plant community richness. In contrast, increasing plant community richness significantly altered soil bacterial community composition and was negatively correlated with bacterial diversity. Concentrations of soil carbon, organic matter, nitrogen, phosphorus, and potassium were similarly negatively correlated with bacterial diversity, whereas the proportion of antagonistic bacteria was positively correlated with soil bacterial diversity. Results suggest that plant species influences on soil bacterial communities depend on plant community diversity and are mediated through the effects of plant-derived resources on antagonistic soil microbes.
[Mh] Termos MeSH primário: Biodiversidade
Consórcios Microbianos
Plantas
Microbiologia do Solo
[Mh] Termos MeSH secundário: Andropogon
Lespedeza
Lupinus
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Em] Mês de entrada:1509
[Cu] Atualização por classe:150803
[Lr] Data última revisão:
150803
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150804
[St] Status:MEDLINE


  10 / 58 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:25697879
[Au] Autor:Ribeiro GO; Gonçalves LC; Pereira LG; Chaves AV; Wang Y; Beauchemin KA; McAllister TA
[Ad] Endereço:1Escola de Veterinária,Universidade Federal de Minas Gerais,Belo Horizonte,MG 31270-901,Brazil.
[Ti] Título:Effect of fibrolytic enzymes added to a Andropogon gayanus grass silage-concentrate diet on rumen fermentation in batch cultures and the artificial rumen (Rusitec).
[So] Source:Animal;9(7):1153-62, 2015 Jul.
[Is] ISSN:1751-732X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In vitro batch cultures were used to screen four fibrolytic enzyme mixtures at two dosages added to a 60 : 40 silage : concentrate diet containing the C(4) tropical grass Andropogon gayanus grass ensiled at two maturities - vegetative stage (VS) and flowering stage (FS). Based on these studies, one enzyme mixture was selected to treat the same diets and evaluate its impact on fermentation using an artificial rumen (Rusitec). In vitro batch cultures were conducted as a completely randomized design with two runs, four replicates per run and 12 treatments in a factorial arrangement (four enzyme mixtures×three doses). Enzyme additives (E1, E2, E3 and E4) were commercial products and contained a range of endoglucanase, exoglucanase and xylanase activities. Enzymes were added to the complete diet 2 h before incubation at 0, 2 and 4 µl/g of dry matter (DM). Gas production (GP) was measured after 3, 6, 12, 24 and 48 h of incubation. Disappearance of DM (DMD), NDF (NDFD) and ADF (ADFD) were determined after 24 and 48 h. For all four enzyme mixtures, a dosage effect (P>0.05) DM, N, NDF or ADF disappearance after 48 h of incubation nor daily ammonia-N, volatile fatty acids or CH(4) production. However, enzyme application increased (P<0.05) microbial N production in feed particle-associated (loosely-associated) and silage feed particle-bound (firmly associated) fractions. With A. gayanus silage diets, degradation may not be limited by microbial colonization, but rather by the ability of fibrolytic enzymes to degrade plant cell walls within this recalcitrant forage.
[Mh] Termos MeSH primário: Andropogon/metabolismo
Técnicas de Cultura Celular por Lotes/métodos
Celulase/farmacologia
Fermentação/efeitos dos fármacos
Rúmen/metabolismo
Silagem/análise
Xilosidases/farmacologia
[Mh] Termos MeSH secundário: Amônia/metabolismo
Animais
Ácidos Graxos Voláteis/metabolismo
Metano/biossíntese
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Fatty Acids, Volatile); 7664-41-7 (Ammonia); EC 3.2.1.- (Xylosidases); EC 3.2.1.4 (Cellulase); OP0UW79H66 (Methane)
[Em] Mês de entrada:1602
[Cu] Atualização por classe:150619
[Lr] Data última revisão:
150619
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150221
[St] Status:MEDLINE
[do] DOI:10.1017/S1751731115000221



página 1 de 6 ir para página                
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde