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Pesquisa : B01.650.940.800.575.912.250.735.888 [Categoria DeCS]
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  1 / 21 MEDLINE  
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[PMID]:28533204
[Au] Autor:Sadowski EM; Seyfullah LJ; Wilson CA; Calvin CL; Schmidt AR
[Ad] Endereço:Department of Geobiology, University of Göttingen, Goldschmidtstraße 3, 37077 Göttingen, Germany eva-maria.sadowski@geo.uni-goettingen.de.
[Ti] Título:Diverse early dwarf mistletoes ( ), ecological keystones of the Eocene Baltic amber biota.
[So] Source:Am J Bot;104(5):694-718, 2017 May.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Extant dwarf mistletoes ( M. Bieb., Viscaceae) are hemiparasites with complex roles in nature. They are one of the most severe pests in northern hemisphere conifer forests, but they also enhance the structural complexity and species diversity of the forests. Here, we describe the first pre-Miocene macrofossils of dwarf mistletoes. The fossils from Eocene Baltic amber provide new insights into the morphological evolution of the lineage and its paleobiogeography. METHODS: The amber inclusions were investigated with light microscopy and compared with extant Viscaceae and to historic descriptions of lost Baltic amber fossils with affinities to Viscaceae. KEY RESULTS: Six fossil species of the lineage, comb. nov., comb. nov., sp. nov., sp. nov., comb. nov. and sp. nov., occurred in source forests of Baltic amber, representing the oldest macrofossil evidence of dwarf mistletoes. They share morphological features of their bracts, internodes, fruits, and stomata with extant . Differences from extant dwarf mistletoes, such as the perianth merosity, the nonfusion of squamate bracts and presence of oblanceolate expanded leaves, indicate their affiliation to an ancient lineage of the genus. CONCLUSIONS: The occurrence of six species of dwarf mistletoes in a single amber deposit suggests was a keystone taxon of the Baltic amber source area. As in extant conifer forests, they probably influenced the structural complexity of the forest, not only leading to more open woodlands but also increasing species diversity, at least at a microhabitat scale.
[Mh] Termos MeSH primário: Âmbar
Viscaceae/classificação
[Mh] Termos MeSH secundário: Países Bálticos
Biota
Fósseis
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Amber)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171019
[Lr] Data última revisão:
171019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170524
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1600390


  2 / 21 MEDLINE  
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[PMID]:28057689
[Au] Autor:Suaza-Gaviria V; González F; Pabón-Mora N
[Ad] Endereço:Universidad de Antioquia, Instituto de Biología, Medellín, AA 1226, Colombia.
[Ti] Título:Comparative inflorescence development in selected Andean Santalales.
[So] Source:Am J Bot;104(1):24-38, 2017 Jan.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Loranthaceae, Santalaceae, and Viscaceae are the most diversified hemiparasitic families of Santalales in the Andes. Their partial inflorescences (PIs) vary from solitary flowers, or dichasia in most Santalales, to congested floral groups along articles in most Viscaceae. The atypical articled inflorescences in Phoradendreae (Viscaceae), a phylogenetic novelty restricted to this tribe, have been variously described as racemes, spikes, fascicles, or as intercalary inflorescences, but no developmental studies have been performed to compare them with the construction of PIs across Santalales. METHODS: We used standard light microscopy and scanning electron microscopy to record the inflorescence development in members of Phoradendreae (Viscaceae) in comparison to those in species of Aetanthus, Gaiadendron, Oryctanthus, Passovia, and Peristethium (Loranthaceae) and Antidaphne (Santalaceae). KEY RESULTS: Morphological and developmental comparisons as well as optimization onto a phylogenetic framework indicate that individual inflorescences in Santalales are indeterminate and are formed by axillary cymose PIs. The latter correspond to dichasia, either simple, compound, or variously reduced by abortion of lateral flowers, abortion of the terminal flower, or loss of bracteoles. CONCLUSIONS: Dichasia are plesiomorphic in Santalales. These results favor the interpretation that inflorescences in Phoradendreae are formed by the fusion of serial dichasia (=floral rows) with the main inflorescence axis via syndesmy. We compared this interpretation with the competing one based on the co-occurrence of collateral and serial floral buds.
[Mh] Termos MeSH primário: Flores/anatomia & histologia
Inflorescência/anatomia & histologia
Magnoliopsida/anatomia & histologia
[Mh] Termos MeSH secundário: Flores/crescimento & desenvolvimento
Flores/ultraestrutura
Inflorescência/crescimento & desenvolvimento
Inflorescência/ultraestrutura
Loranthaceae/anatomia & histologia
Loranthaceae/classificação
Loranthaceae/ultraestrutura
Magnoliopsida/classificação
Magnoliopsida/ultraestrutura
Microscopia Eletrônica de Varredura
Santalaceae/anatomia & histologia
Santalaceae/classificação
Santalaceae/ultraestrutura
Especificidade da Espécie
Viscaceae/anatomia & histologia
Viscaceae/classificação
Viscaceae/ultraestrutura
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170107
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1600253


  3 / 21 MEDLINE  
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[PMID]:27154249
[Au] Autor:Yule KM; Koop JA; Alexandre NM; Johnston LR; Whiteman NK
[Ad] Endereço:Department of Ecology and Evolutionary Biology, University of Arizona, 1041 E Lowell St, Tucson, AZ, 85721, USA.
[Ti] Título:Population structure of a vector-borne plant parasite.
[So] Source:Mol Ecol;25(14):3332-43, 2016 Jul.
[Is] ISSN:1365-294X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Parasites are among the most diverse groups of life on Earth, yet complex natural histories often preclude studies of their speciation processes. The biology of parasitic plants facilitates in situ collection of data on both genetic structure and the mechanisms responsible for that structure. Here, we studied the role of mating, dispersal and establishment in host race formation of a parasitic plant. We investigated the population genetics of a vector-borne desert mistletoe (Phoradendron californicum) across two legume host tree species (Senegalia greggii and Prosopis velutina) in the Sonoran desert using microsatellites. Consistent with host race formation, we found strong host-associated genetic structure in sympatry, little genetic variation due to geographic site and weak isolation by distance. We hypothesize that genetic differentiation results from differences in the timing of mistletoe flowering by host species, as we found initial flowering date of individual mistletoes correlated with genetic ancestry. Hybrids with intermediate ancestry were detected genetically. Individuals likely resulting from recent, successful establishment events following dispersal between the host species were detected at frequencies similar to hybrids between host races. Therefore, barriers to gene flow between the host races may have been stronger at mating than at dispersal. We also found higher inbreeding and within-host individual relatedness values for mistletoes on the more rare and isolated host species (S. greggii). Our study spanned spatial scales to address how interactions with both vectors and hosts influence parasitic plant structure with implications for parasite virulence evolution and speciation.
[Mh] Termos MeSH primário: Fabaceae/parasitologia
Genética Populacional
Viscaceae/genética
[Mh] Termos MeSH secundário: Animais
Arizona
Evolução Biológica
Fabaceae/genética
Flores/fisiologia
Fluxo Gênico
Variação Genética
Hibridização Genética
Endogamia
Insetos Vetores
Repetições de Microssatélites
Reprodução
Simpatria
Viscaceae/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170620
[Lr] Data última revisão:
170620
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160508
[St] Status:MEDLINE
[do] DOI:10.1111/mec.13693


  4 / 21 MEDLINE  
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[PMID]:26323940
[Au] Autor:Iloki-Assanga SB; Lewis-Luján LM; Lara-Espinoza CL; Gil-Salido AA; Fernandez-Angulo D; Rubio-Pino JL; Haines DD
[Ad] Endereço:Rubio Pharma y Asociados S.A. de C.V., Blvd. García Morales, Km. 6.5 # 330. El Llano, 83210, Hermosillo, Sonora, Mexico. ilokiasb@yahoo.com.
[Ti] Título:Solvent effects on phytochemical constituent profiles and antioxidant activities, using four different extraction formulations for analysis of Bucida buceras L. and Phoradendron californicum.
[So] Source:BMC Res Notes;8:396, 2015 Sep 01.
[Is] ISSN:1756-0500
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The present investigation evaluated 4 different solvent compositions for their relative capacity to extract total phenolic and total flavonoid (TF) components of the leaves, trunks, and stems of Bucida buceras L. (Combretaceae), and the stems of Phoradendron californicum (Viscaceae), plus mesquite and oak species endemic to the Southwestern United States, northern Mexico, and tropical regions of Central and South America, as well as to profile the composition of these plant materials and to measure their antioxidant capacity. METHODS: The total phenolic content of plant material used in the present investigation was measured using the Folin-Ciocalteau assay. Total flavonoids were assayed by AlCl3 and 2,4-dinitrophenylhydrazin colorimetry. Nitroblue tetrazolium was utilized for scavenging of superoxide anion, and in vitro antioxidant activity was evaluated using the 2, 2-diphenyl-1-picrylhydrazyl and Ferric Reducing/Antioxidant Power assays. RESULTS: Phytochemical screening of each plant extract evaluated revealed the following major results: (1) No evidence of alkaloids for each of the extraction phases tested was detected in the hexanic, ethanolic, or aqueous phases of Bucida buceras and Phoradendron californicum (oak and mesquite); (2) Analysis of the hexane phase of B. buceras and P. californicum (mesquite) extracts revealed the presence of carotenes, triterpenes/steroids, and lactonic groups; (3) Analysis of the ethanol and aqueous extraction phases for both plants revealed the presence of a diverse range of compounds, including tripterpenes/steroids, lactonics groups, saponins, phenols/tannins, amines and/or amino acids, and flavonoids/anthocyanins; and (4) The highest total phenolic and flavonoid content were observed in P. californicum (oak): 523.886 ± 51.457 µg GAE/mg extract and 409.651 ± 23.091 µg/mg of extract for methanol and aqueous fractions, respectively. The highest flavonoid content was 237.273 ± 21.250 µg PNE/mg extract in the acetone extract of Bucida buceras stems; while the flavonol content (260.685 ± 23.031 µg CE/mg extract) was higher in the ethanol extract of P. californicum (oak). The acetone extract of B. buceras trunk extract showed the highest levels of DPPH radical-scavenging activity (IC50 = 4.136 ± 0.446 µg/mL) and reducing power (4928.392 ± 281.427 µM AAE/mg extract). The highest superoxide radical scavenging activity (IC50) was 55.249 ± 9.829 µg/mL, observed in acetone extracts of B. buceras leaves. CONCLUSIONS: The results of the present investigation demonstrated the effects of extraction solvent on phenolic and flavonoid content yield-and antioxidant activities by Bucida buceras and Phoradendron californicum. The present investigation further revealed that Bucida buceras exhibited optimal antioxidant capacity when acetone was used as extraction solvent; and the highest yield of phenols and flavonoids were obtained from the P. californicum oak, using methanol and aqueous solvents, respectively.
[Mh] Termos MeSH primário: Antioxidantes/farmacologia
Combretaceae/química
Extratos Vegetais/química
Solventes/química
Viscaceae/química
[Mh] Termos MeSH secundário: Flavonoides/análise
Fenóis/análise
Estruturas Vegetais/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Antioxidants); 0 (Flavonoids); 0 (Phenols); 0 (Plant Extracts); 0 (Solvents)
[Em] Mês de entrada:1606
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150902
[St] Status:MEDLINE
[do] DOI:10.1186/s13104-015-1388-1


  5 / 21 MEDLINE  
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[PMID]:26236010
[Au] Autor:Abdallah HM; Farag MA; Abdel-Naim AB; Ghareib SA; Abdel-Sattar EA
[Ad] Endereço:Department of Natural Products, Faculty of Pharmacy, King Abdulaziz University, Jeddah, 21589, Saudi Arabia.
[Ti] Título:Mechanistic Evidence of Viscum schimperi (Viscaceae) Antihyperglycemic Activity: From a Bioactivity-guided Approach to Comprehensive Metabolite Profiling.
[So] Source:Phytother Res;29(11):1737-43, 2015 Nov.
[Is] ISSN:1099-1573
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Diabetes mellitus is possibly the world's largest growing metabolic disorder. Effective treatment of diabetes is increasingly dependent on active constituents of medicinal plants capable of controlling hyperglycemia as well as its secondary complications. Viscum schimperi Engl. is a plant growing in Saudi Arabia and known for its antidiabetic activity. The potential antidiabetic activity of its methanol extract as well as its chloroform, n-butanol, and the remaining water fractions was evaluated in streptozotocin-induced diabetic rats at two dose levels. The antidiabetic activity was assessed through the determination of fasting blood glucose level, insulin levels, area under the curve (AUC) in oral glucose tolerance test, glucose absorption in isolated rat gut assay, and glucose uptake by psoas muscle. Moreover, large-scale untargeted metabolite profiling of methanol extract was performed via UPLC-PDA and qTOF-MS (ultra-performance liquid chromatography photodiode array detection and quadrupole time-of-flight mass spectrometry) respectively, to explore its chemical composition and standardization of its extract. Multivariate statistical analysis including principal component analysis and orthogonal projection to latent structures discriminant analysis was used to determine bioactives in its fractions. In conclusion, oleanane triterpenes and O-caffeoyl quinic acid conjugates were the major compounds that might account for antihyperglycemic effect of the plant.
[Mh] Termos MeSH primário: Diabetes Mellitus Experimental/tratamento farmacológico
[Mh] Termos MeSH secundário: 1-Butanol
Animais
Glucose/metabolismo
Teste de Tolerância a Glucose
Hipoglicemiantes/farmacologia
Masculino
Metanol
Extratos Vegetais/farmacologia
Plantas Medicinais
Ratos
Arábia Saudita
Estreptozocina
Viscaceae
Viscum
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Hypoglycemic Agents); 0 (Plant Extracts); 5W494URQ81 (Streptozocin); 8PJ61P6TS3 (1-Butanol); IY9XDZ35W2 (Glucose); Y4S76JWI15 (Methanol)
[Em] Mês de entrada:1603
[Cu] Atualização por classe:151104
[Lr] Data última revisão:
151104
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150804
[St] Status:MEDLINE
[do] DOI:10.1002/ptr.5424


  6 / 21 MEDLINE  
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[PMID]:24973917
[Au] Autor:Marias DE; Meinzer FC; Woodruff DR; Shaw DC; Voelker SL; Brooks JR; Lachenbruch B; Falk K; McKay J
[Ad] Endereço:Forest Ecosystems and Society, Oregon State University, 321 Richardson Hall, Corvallis, OR 97331, USA danielle.marias@oregonstate.edu.
[Ti] Título:Impacts of dwarf mistletoe on the physiology of host Tsuga heterophylla trees as recorded in tree-ring C and O stable isotopes.
[So] Source:Tree Physiol;34(6):595-607, 2014 Jun.
[Is] ISSN:1758-4469
[Cp] País de publicação:Canada
[La] Idioma:eng
[Ab] Resumo:Dwarf mistletoes, obligate, parasitic plants with diminutive aerial shoots, have long-term effects on host tree water relations, hydraulic architecture and photosynthetic gas exchange and can eventually induce tree death. To investigate the long-term (1886-2010) impacts of dwarf mistletoe on the growth and gas exchange characteristics of host western hemlock, we compared the diameter growth and tree-ring cellulose stable carbon (C) and oxygen (O) isotope ratios (δ(13)Ccell, δ(18)Ocell) of heavily infected and uninfected trees. The relative basal area growth of infected trees was significantly greater than that of uninfected trees in 1886-90, but declined more rapidly in infected than uninfected trees through time and became significantly lower in infected than uninfected trees in 2006-10. Infected trees had significantly lower δ(13)Ccell and δ(18)Ocell than uninfected trees. Differences in δ(18)Ocell between infected and uninfected trees were unexpected given that stomatal conductance and environmental variables that were expected to influence the δ(18)O values of leaf water were similar for both groups. However, estimates of mesophyll conductance (gm) were significantly lower and estimates of effective path length for water movement (L) were significantly higher in leaves of infected trees, consistent with their lower values of δ(18)Ocell. This study reconstructs the long-term physiological responses of western hemlock to dwarf mistletoe infection. The long-term diameter growth and δ(13)Ccell trajectories suggested that infected trees were growing faster than uninfected trees prior to becoming infected and subsequently declined in growth and leaf-level photosynthetic capacity compared with uninfected trees as the dwarf mistletoe infection became severe. This study further points to limitations of the dual-isotope approach for identifying sources of variation in δ(13)Ccell and indicates that changes in leaf internal properties such as gm and L that affect δ(18)Ocell must be considered.
[Mh] Termos MeSH primário: Carbono/metabolismo
Interações Hospedeiro-Parasita
Oxigênio/metabolismo
Doenças das Plantas/parasitologia
Tsuga/fisiologia
Viscaceae/fisiologia
[Mh] Termos MeSH secundário: Isótopos de Carbono/análise
Células do Mesofilo
Isótopos de Oxigênio/análise
Fotossíntese/fisiologia
Folhas de Planta/crescimento & desenvolvimento
Folhas de Planta/parasitologia
Folhas de Planta/fisiologia
Caules de Planta/crescimento & desenvolvimento
Caules de Planta/parasitologia
Caules de Planta/fisiologia
Transpiração Vegetal/fisiologia
Árvores
Tsuga/crescimento & desenvolvimento
Tsuga/parasitologia
Washington
Água/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
0 (Carbon Isotopes); 0 (Oxygen Isotopes); 059QF0KO0R (Water); 7440-44-0 (Carbon); S88TT14065 (Oxygen)
[Em] Mês de entrada:1502
[Cu] Atualização por classe:140708
[Lr] Data última revisão:
140708
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140630
[St] Status:MEDLINE
[do] DOI:10.1093/treephys/tpu046


  7 / 21 MEDLINE  
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[PMID]:22905764
[Au] Autor:Logan BA; Reblin JS; Zonana DM; Dunlavey RF; Hricko CR; Hall AW; Schmiege SC; Butschek RA; Duran KL; Emery RJ; Kurepin LV; Lewis JD; Pharis RP; Phillips NG; Tissue DT
[Ad] Endereço:Biology Department, Bowdoin College, Brunswick, ME 04011, USA. blogan@bowdoin.edu
[Ti] Título:Impact of eastern dwarf mistletoe (Arceuthobium pusillum) on host white spruce (Picea glauca) development, growth and performance across multiple scales.
[So] Source:Physiol Plant;147(4):502-13, 2013 Apr.
[Is] ISSN:1399-3054
[Cp] País de publicação:Denmark
[La] Idioma:eng
[Ab] Resumo:Infection by eastern dwarf mistletoe (Arceuthobium pusillum) modifies needle and branch morphology and hastens white spruce (Picea glauca) mortality. We examined potential causal mechanisms and assessed the impacts of infection-induced alterations to host development and performance across scales ranging from needle hormone contents to bole expansion. Needles on infected branches (IBs) possessed higher total cytokinin (CK) and lower abscisic acid contents than needles on uninfected branches (UBs). IBs exhibited greater xylem growth than same-aged UBs, which is consistent with the promotive effect of CKs on vascular differentiation and organ sink strength. Elevated CK content may also explain the dense secondary and tertiary branching observed at the site of infection, i.e. the formation of 'witches' brooms' with significantly lower light capture efficiencies. Observed hormone perturbations were consistent with higher rates of transpiration, lower water use efficiencies (WUEs) and more negative needle carbon isotope ratios observed for IBs. Observed reductions in needle size allowed IBs to compensate for reduced hydraulic conductivity. Severe infections resulted in dramatically decreased diameter growth of the bole. It seems likely that the modifications to host hormone contents by eastern dwarf mistletoe infection led white spruce trees to dedicate a disproportionate fraction of their photoassimilate and other resources to self-shaded branches with low WUE. This would have decreased the potential for fixed carbon accumulation, generating a decline in the whole-tree resource pool. As mistletoe infections grew in size and the number of IBs increased, this burden was manifested as increasingly greater reductions in bole growth.
[Mh] Termos MeSH primário: Interações Hospedeiro-Parasita
Picea/crescimento & desenvolvimento
Picea/metabolismo
Viscaceae/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Ácido Abscísico/metabolismo
Dióxido de Carbono/metabolismo
Isótopos de Carbono/análise
Isótopos de Carbono/metabolismo
Luz
Maine
Reguladores de Crescimento de Planta/metabolismo
Brotos de Planta/fisiologia
Caules de Planta/fisiologia
Água
[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 (Carbon Isotopes); 0 (Plant Growth Regulators); 059QF0KO0R (Water); 142M471B3J (Carbon Dioxide); 72S9A8J5GW (Abscisic Acid)
[Em] Mês de entrada:1309
[Cu] Atualização por classe:131121
[Lr] Data última revisão:
131121
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:120822
[St] Status:MEDLINE
[do] DOI:10.1111/j.1399-3054.2012.01681.x


  8 / 21 MEDLINE  
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[PMID]:22864809
[Au] Autor:Kwanda N; Noikotr K; Sudmoon R; Tanee T; Chaveerach A
[Ad] Endereço:Department of Biology, Faculty of Science, Khon Kaen University, 123 Mitraphap Highway, Khon Kaen, 40002, Thailand.
[Ti] Título:Medicinal parasitic plants on diverse hosts with their usages and barcodes.
[So] Source:J Nat Med;67(3):438-45, 2013 Jul.
[Is] ISSN:1861-0293
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:Medicinal properties of parasitic plants were investigated by means of ethnobotanical study in some areas of northeastern Thailand. Important traditional usages are: Scurrula atropurpurea nourishes blood, Dendrophthoe pentandra decreases high blood pressure, and Helixanthera parasitica treats liver disease. Their systematics were also determined. The research is based on findings obtained from 100 parasite-host pairs. Of these, eight parasitic species were recorded; they are members of two families, viz. family Loranthaceae, namely D. lanosa, D. pentandra, H. parasitica, Macrosolen brandisianus, M. cochinchinensis and S. atropurpurea, and family Viscaceae, namely Viscum articulatum and V. ovalifolium. In addition, each parasitic species is found on diverse hosts, indicating non-host-parasitic specificity. Species-specific tagging of all species studied was carried out using the rbcL and psbA-trnH chloroplast regions. These tag sequences are submitted to GenBank databases under accession numbers JN687563-JN687578. Genetic distances calculated from nucleotide variations in a couple of species of each genus, Dendrophthoe, Macrosolen, and Viscum, were 0.032, 0.067 and 0.036 in the rbcL region, and 0.269, 0.073 and 0.264 in the psbA-trnH spacer region, respectively. These variations will be used for further identification of incomplete plant parts or other forms such as capsule, powder, dried or chopped pieces.
[Mh] Termos MeSH primário: Código de Barras de DNA Taxonômico
DNA de Plantas/análise
Interações Hospedeiro-Parasita
Loranthaceae/genética
Viscaceae/genética
[Mh] Termos MeSH secundário: Sequência de Bases
DNA Intergênico
DNA de Plantas/classificação
Bases de Dados Genéticas
Etnobotânica
Etiquetas de Sequências Expressas
Regulação da Expressão Gênica de Plantas
Marcadores Genéticos
Genótipo
Loranthaceae/classificação
Dados de Sequência Molecular
Fenótipo
Complexo de Proteínas do Centro de Reação Fotossintética/genética
Fitoterapia
Plantas Medicinais
Ribulose-Bifosfato Carboxilase/genética
Especificidade da Espécie
Tailândia
Viscaceae/classificação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Intergenic); 0 (DNA, Plant); 0 (Genetic Markers); 0 (Photosynthetic Reaction Center Complex Proteins); EC 4.1.1.39 (RbcL protein, plastid); EC 4.1.1.39 (Ribulose-Bisphosphate Carboxylase)
[Em] Mês de entrada:1405
[Cu] Atualização por classe:171104
[Lr] Data última revisão:
171104
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:120807
[St] Status:MEDLINE
[do] DOI:10.1007/s11418-012-0695-2


  9 / 21 MEDLINE  
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[PMID]:22562749
[Au] Autor:Ross Friedman C; Ross BN; Martens GD
[Ad] Endereço:Department of Biological Sciences, Thompson Rivers University, 900 McGill Rd., Kamloops, British Columbia V2C 0E8, Canada. cross@tru.ca
[Ti] Título:An antibody against a conserved C-terminal consensus motif from plant alternative oxidase (AOX) isoforms 1 and 2 label plastids in the explosive dwarf mistletoe (Arceuthobium americanum, Santalaceae) fruit exocarp.
[So] Source:Protoplasma;250(1):317-23, 2013 Feb.
[Is] ISSN:1615-6102
[Cp] País de publicação:Austria
[La] Idioma:eng
[Ab] Resumo:Dwarf mistletoes, genus Arceuthobium (Santalaceae), are parasitic angiosperms that spread their seeds by an explosive process. As gentle heating triggers discharge in the lab, we wondered if thermogenesis (endogenous heat production) is associated with dispersal. Thermogenesis occurs in many plants and is enabled by mitochondrial alternative oxidase (AOX) activity. The purpose of this study was to probe Arceuthobium americanum fruit (including seed tissues) collected over a 10-week period with an anti-AOX antibody/gold-labeled secondary antibody to determine if AOX could be localized in situ, and if so, quantitatively assess whether label distribution changed during development; immunochemical results were evaluated with Western blotting. No label could be detected in the mitochondria of any fruit or seed tissue, but was observed in fruit exocarp plastids of samples collected in the last 2 weeks of study; plastids collected in week 10 had significantly more label than week 9 (p = 0.002). Western blotting of whole fruit and mitochondrial proteins revealed a signal at 30-36 kD, suggestive of AOX, while blots of whole fruit (but not mitochondrial fraction) proteins showed a second band at 40-45 kD, in agreement with plastid terminal oxidases (PTOXs). AOX enzymes are likely present in the A. americanum fruit, even though they were not labeled in mitochondria. The results strongly indicate that the anti-AOX antibody was labeling PTOX in plastids, probably at a C-terminal region conserved in both enzymes. PTOX in plastids may be involved in fruit ripening, although a role for PTOX in thermogenesis cannot be eliminated.
[Mh] Termos MeSH primário: Proteínas Mitocondriais/química
Oxirredutases/química
Proteínas de Plantas/química
Viscaceae/enzimologia
[Mh] Termos MeSH secundário: Anticorpos/química
Anticorpos/imunologia
Western Blotting
Sequência Conservada/imunologia
Frutas/química
Frutas/enzimologia
Frutas/ultraestrutura
Imuno-Histoquímica
Isoenzimas
Microscopia Eletrônica de Transmissão
Proteínas Mitocondriais/imunologia
Oxirredutases/imunologia
Proteínas de Plantas/imunologia
Plastídeos/química
Plastídeos/enzimologia
Plastídeos/ultraestrutura
Viscaceae/ultraestrutura
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Antibodies); 0 (Isoenzymes); 0 (Mitochondrial Proteins); 0 (Plant Proteins); EC 1.- (Oxidoreductases); EC 1.- (alternative oxidase)
[Em] Mês de entrada:1401
[Cu] Atualização por classe:171012
[Lr] Data última revisão:
171012
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:120508
[St] Status:MEDLINE
[do] DOI:10.1007/s00709-012-0414-6


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Texto completo
[PMID]:23196398
[Au] Autor:Martin LL; Ross Friedman CM; Phillips LA
[Ad] Endereço:Department of Biological Sciences, Thompson Rivers University, 900 McGill Road, Kamloops, British Columbia, Canada.
[Ti] Título:Fungal endophytes of the obligate parasitic dwarf mistletoe Arceuthobium americanum (Santalaceae) act antagonistically in vitro against the native fungal pathogen Cladosporium (Davidiellaceae) of their host.
[So] Source:Am J Bot;99(12):2027-34, 2012 Dec.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Endophytic fungi likely occur in all plants, yet little is known about those of parasitic plants, despite their potential to influence parasite success. Arceuthobium americanum is a parasitic angiosperm that greatly compromises the North American timber industry. We hypothesized that (1) A. americanum hosts fungal endophytes, and (2) these endophytes help A. americanum resist infection by fungal pathogens. • METHODS: Healthy A. americanum stem and fruit tissues were differentially stained for cellulose and chitin and visualized using fluorescence microscopy. Stem sections (sterilized vs. unsterilized) and seeds were incubated on agar plates to cultivate fungi, both to extract DNA for ITS rDNA sequencing and to observe interactions with native fungi from unsterilized specimens. • KEY RESULTS: Aside from xylem vessel elements, fungal structures were observed in all tissues, including those of the embryo. The ITS sequences of fungi cultured from internal tissues closely matched those of the known endophytes Phoma, Sydowia, and Phacidiopycnis, while those of surface organisms closely matched Cladosporium spp. Cultured fungi from internal tissues (putative endophytes) inhibited the growth of the surface organisms without affecting the other endophytes. • CONCLUSION: Fungal communities are established in A. americanum stems as well as in fruits and seeds, suggesting vertical transmission. These internally derived fungi act antagonistically toward fungi with pathogenic tendencies. As such, native mistletoe endophytes might protect A. americanum against fungal pathogens in nature. In the future, manipulation of endophytes might be a component of mistletoe control programs.
[Mh] Termos MeSH primário: Cladosporium/crescimento & desenvolvimento
Cladosporium/genética
Endófitos/fisiologia
Viscaceae/microbiologia
[Mh] Termos MeSH secundário: Colúmbia Britânica
Cladosporium/classificação
DNA Fúngico/genética
DNA Espaçador Ribossômico/genética
Endófitos/classificação
Endófitos/genética
Endófitos/ultraestrutura
Microscopia de Fluorescência
Dados de Sequência Molecular
Filogenia
Reação em Cadeia da Polimerase
Análise de Sequência de DNA
Homologia de Sequência
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (DNA, Fungal); 0 (DNA, Ribosomal Spacer)
[Em] Mês de entrada:1305
[Cu] Atualização por classe:121217
[Lr] Data última revisão:
121217
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:121201
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1200189



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