Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.912.250.618.050.750.488 [Categoria DeCS]
Referências encontradas : 14 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 2 ir para página        

  1 / 14 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28065928
[Au] Autor:Gonçalves-Souza P; Schlindwein C; Dötterl S; Paiva EA
[Ad] Endereço:Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil and.
[Ti] Título:Unveiling the osmophores of Philodendron adamantinum (Araceae) as a means to understanding interactions with pollinators.
[So] Source:Ann Bot;119(4):533-543, 2017 Mar 01.
[Is] ISSN:1095-8290
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Background and Aims: Araceae species pollinated by nocturnal Cyclocephalini beetles attract their pollinators by inflorescence scents. In Philodendron , despite the intense odour, the osmophores exhibit no definite morphological identity, making them difficult to locate. This may explain why structural studies of the scent-releasing tissue are not available so far. Methods: Several approaches were employed for locating and understanding the osmophores of Philodendron adamantinum . A sensory test allowed other analyses to be restricted to fertile and sterile stamens as odour production sites. Stamens were studied under light and electron microscopy. Dynamic headspace and gas chromatography-mass spectrometry were used to collect and analyse scents from different zones of the inflorescence. Key Results: The epidermal cells of the distal portion of fertile stamens and staminodes are papillose and, similar to the parenchyma cells of this region, have dense cytoplasm and large nuclei. In these cells, the composition of organelles is compatible with secretory activity, especially the great number of mitochondria and plastids. In this portion, lipid droplets that are consumed concomitantly with the release of odour were observed. Quantitative scent analyses revealed that the scent, with a predominance of dihydro-ß-ionone, is mainly emitted by the fertile and sterile staminate zones of the spadix. An amorphous substance in the stomata pores indicates that the components are secreted and volatilized outside of the osmophore under thermogenic heat. Conclusions: Despite the difficulty in locating osmophores in the absence of morphological identity and inefficiency of neutral red staining, the osmophores of P. adamantinum have some features expected for these structures. The results indicate a functional link between thermogenesis and volatilization of osmophore secretions to produce olfactory signals for attracting specialized beetle pollinators. These first experimental data about the precise location of osmophores in Philodendron will stimulate studies in related species that will allow future comparison and the establishment of patterns of functional morphology.
[Mh] Termos MeSH primário: Philodendron/anatomia & histologia
Polinização
[Mh] Termos MeSH secundário: Animais
Coleópteros
Flores/anatomia & histologia
Flores/metabolismo
Flores/fisiologia
Flores/ultraestrutura
Cromatografia Gasosa-Espectrometria de Massas
Microscopia Eletrônica
Philodendron/fisiologia
Polinização/fisiologia
Compostos Orgânicos Voláteis/análise
Compostos Orgânicos Voláteis/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Volatile Organic Compounds)
[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:170110
[St] Status:MEDLINE
[do] DOI:10.1093/aob/mcw236


  2 / 14 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28027618
[Au] Autor:Joffard N; Legendre L; Gibernau M; Pascal L
[Ad] Endereço:UMR CNRS 5175, Centre d'Ecologie Fonctionnelle et Evolutive, 1919 route de Mende, FR-34293, Montpellier.
[Ti] Título:Differential Accumulation of Volatile Organic Compounds by Leaves and Roots of Two Guianese Philodendron Species, P. fragrantissimum Kunth and P. melinonii Brongn.
[So] Source:Chem Biodivers;14(4), 2017 Apr.
[Is] ISSN:1612-1880
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Leaf and root essential oils of two closely related but ecologically distant Philodendron species were extracted in natural conditions in French Guiana and analysed by GC/MS to i) describe the blends of volatile organic compounds (VOCs) produced by those species and ii) analyse species and environment-based variations in extracts composition. A total of 135 VOCs were detected with a majority of aliphatic sesquiterpenes. P. fragrantissimum produced mainly ß-bisabolene (on average 29.12% of the extract) as well as α- and ß-selinene (14.52% and 17.50%, respectively) while in P. melinonii, four aliphatic sesquiterpenes could alternatively be the main component: (E)-ß-farnesene (up to 91.42% of the extract), germacrene-D (73.74%), ß-caryophyllene (51.63%) and trans-α-bergamotene (41.26%). A significant effect of species and organs on extracts composition was observed while the environment (sun exposure) only affected the relative proportions of monoterpenes and sesquiterpenes in roots of P. melinonii. These results are discussed in the light of the potential role of leaf and root terpenes in Philodendron species.
[Mh] Termos MeSH primário: Philodendron/química
Compostos Orgânicos Voláteis/análise
[Mh] Termos MeSH secundário: Guiana Francesa
Monoterpenos/análise
Monoterpenos/efeitos da radiação
Óleos Voláteis/análise
Folhas de Planta/química
Raízes de Plantas/química
Raízes de Plantas/efeitos da radiação
Sesquiterpenos/análise
Sesquiterpenos/efeitos da radiação
Luz Solar
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Monoterpenes); 0 (Oils, Volatile); 0 (Sesquiterpenes); 0 (Volatile Organic Compounds)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170424
[Lr] Data última revisão:
170424
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161228
[St] Status:MEDLINE
[do] DOI:10.1002/cbdv.201600415


  3 / 14 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:24586972
[Au] Autor:de Oliveira LL; Calazans LS; de Morais É; Mayo SJ; Schrago CG; Sakuragui CM
[Ad] Endereço:Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
[Ti] Título:Floral evolution of Philodendron subgenus Meconostigma (Araceae).
[So] Source:PLoS One;9(2):e89701, 2014.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Elucidating the evolutionary patterns of flower and inflorescence structure is pivotal to understanding the phylogenetic relationships of Angiosperms as a whole. The inflorescence morphology and anatomy of Philodendron subgenus Meconostigma, belonging to the monocot family Araceae, has been widely studied but the evolutionary relationships of subgenus Meconostigma and the evolution of its flower characters have hitherto remained unclear. This study examines gynoecium evolution in subgenus Meconostigma in the context of an estimated molecular phylogeny for all extant species of subgenus Meconostigma and analysis of ancestral character reconstructions of some gynoecial structures. The phylogenetic reconstructions of all extant Meconostigma species were conducted under a maximum likelihood approach based on the sequences of two chloroplast (trnk and matK) and two nuclear (ETS and 18S) markers. This topology was used to reconstruct the ancestral states of seven floral characters and to elucidate their evolutionary pattern in the Meconostigma lineage. Our phylogeny shows that Meconostigma is composed of two major clades, one comprising two Amazonian species and the other all the species from the Atlantic Forest and Cerrado biomes with one Amazonian species. The common ancestor of the species of subgenus Meconostigma probably possessed short stylar lobes, long stylar canals, a stylar body, a vascular plexus in the gynoecium and druses in the stylar parenchyma but it is uncertain whether raphide inclusions were present in the parenchyma. The ancestral lineage also probably possessed up to 10 ovary locules. The evolution of these characters seems to have occurred independently in some lineages. We propose that the morphological and anatomical diversity observed in the gynoecial structures of subgenus Meconostigma is the result of an ongoing process of fusion of floral structures leading to a reduction of energy wastage and increase in stigmatic surface.
[Mh] Termos MeSH primário: Flores/anatomia & histologia
Philodendron/genética
[Mh] Termos MeSH secundário: Evolução Biológica
Filogenia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1501
[Cu] Atualização por classe:150515
[Lr] Data última revisão:
150515
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140304
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0089701


  4 / 14 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:23143663
[Au] Autor:Dötterl S; David A; Boland W; Silberbauer-Gottsberger I; Gottsberger G
[Ad] Endereço:Department of Plant Systematics, University of Bayreuth, 95440, Bayreuth, Germany. stefan.doetterl@sbg.ac.at
[Ti] Título:Evidence for behavioral attractiveness of methoxylated aromatics in a dynastid scarab beetle-pollinated araceae.
[So] Source:J Chem Ecol;38(12):1539-43, 2012 Dec.
[Is] ISSN:1573-1561
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Many plants attract their pollinators with floral scents, and these olfactory signals are especially important at night, when visual signals become inefficient. Dynastid scarab beetles are a speciose group of night-active pollinators, and several plants pollinated by these insects have methoxylated aromatic compounds in their scents. However, there is a large gap in our knowledge regarding the compounds responsible for beetle attraction. We used chemical analytical analyses to determine temporal patterns of scent emission and the composition of scent released from inflorescences of Philodendron selloum. The attractiveness of the main components in the scent to the dynastid scarab beetle Erioscelis emarginata, the exclusive pollinator of this plant, was assessed in field biotests. The amount of scent increased rapidly in the evening, and large amounts of scent were released during the activity time of the beetle pollinators. Inflorescences emitted a high number of compounds of different biosynthetic origin, among them both uncommon and also widespread flower scents. Methoxylated aromatic compounds dominated the scent, and 4-methoxystyrene, the most abundant compound, attracted E. emarginata beetles. Other compounds, such as (Z)-jasmone and possibly also the methoxylated aromatic compound 3,4-dimethoxystyrene increased the attractiveness of 4-methoxystyrene. Methoxylated aromatics, which are known from other dynastid pollinated plants as well, are important signals in many scarab beetles in a different context (e.g., pheromones), thus suggesting that these plants exploit pre-existing preferences of the beetles for attracting this group of insects as pollinators.
[Mh] Termos MeSH primário: Comportamento Animal/fisiologia
Coleópteros/fisiologia
Philodendron/química
[Mh] Termos MeSH secundário: Animais
Comportamento Animal/efeitos dos fármacos
Ciclopentanos/química
Ciclopentanos/farmacologia
Flores/química
Cromatografia Gasosa-Espectrometria de Massas
Oxilipinas/química
Oxilipinas/farmacologia
Polinização
Estirenos/química
Estirenos/farmacologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cyclopentanes); 0 (Oxylipins); 0 (Styrenes); 2ISH8T4A6E (4-methoxystyrene); RC4W0G9YUK (jasmone)
[Em] Mês de entrada:1306
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:121113
[St] Status:MEDLINE
[do] DOI:10.1007/s10886-012-0210-y


  5 / 14 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
[PMID]:23030958
[Au] Autor:Faisal TR; Hristozov N; Rey AD; Western TL; Pasini D
[Ad] Endereço:Department of Mechanical Engineering, McGill University, 817 Sherbrooke St. West, Montreal, QC H3A 0C3, Canada. tanvir.faisal@mail.mcgill.ca
[Ti] Título:Experimental determination of Philodendron melinonii and Arabidopsis thaliana tissue microstructure and geometric modeling via finite-edge centroidal Voronoi tessellation.
[So] Source:Phys Rev E Stat Nonlin Soft Matter Phys;86(3 Pt 1):031921, 2012 Sep.
[Is] ISSN:1550-2376
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Plant petioles and stems are hierarchical cellular structures, displaying structural features defined at multiple length scales. One or more of the intermediate hierarchical levels consists of tissues, in which the cellular distribution is quasirandom. The current work focuses on the realistic modeling of plant tissue microstructures. The finite-edge centroidal Voronoi tessellation (FECVT) is here introduced to overcome the drawbacks of the semi-infinite edges of a typical Voronoi model. FECVT can generate a realistic model of a tissue microstructure, which might have finite edges at its border, be defined by a boundary contour of any shape, and include complex heterogeneity and cellular gradients. The centroid-based Voronoi tessellation is applied to model the microstructure of the Philodendron melinonii petiole and the Arabidopsis thaliana stem, which both display intense cellular gradients. FECVT coupled with a digital image processing algorithm is implemented to capture the nonperiodic microstructures of plant tissues. The results obtained via this method satisfactorily obey the geometric, statistical, and topological laws of naturally evolved cellular solids. The predicted models are also validated by experimental data.
[Mh] Termos MeSH primário: Arabidopsis/citologia
Modelos Biológicos
Philodendron/citologia
[Mh] Termos MeSH secundário: Imagem Molecular
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1303
[Cu] Atualização por classe:121003
[Lr] Data última revisão:
121003
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:121004
[St] Status:MEDLINE


  6 / 14 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:21118259
[Au] Autor:Miller RE; Grant NM; Giles L; Ribas-Carbo M; Berry JA; Watling JR; Robinson SA
[Ad] Endereço:Institute for Conservation Biology and Environmental Management, The University of Wollongong, Wollongong, NSW 2522, Australia. Rebecca.miller@monash.edu
[Ti] Título:In the heat of the night--alternative pathway respiration drives thermogenesis in Philodendron bipinnatifidum.
[So] Source:New Phytol;189(4):1013-26, 2011 Mar.
[Is] ISSN:1469-8137
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:• Philodendron bipinnatifidum inflorescences heat up to 42 °C and thermoregulate. We investigated whether they generate heat via the cytochrome oxidase pathway uncoupled by uncoupling proteins (pUCPs), or the alternative oxidase (AOX). • Contribution of AOX and pUCPs to heating in fertile (FM) and sterile (SM) male florets was determined using a combination of oxygen isotope discrimination, protein and substrate analyses. • Both FM and SM florets thermoregulated independently for up to 30 h ex planta. In both floret types, AOX contributed > 90% of respiratory flux during peak heating. The AOX protein increased fivefold with the onset of thermogenesis in both floret types, whereas pUCP remained low throughout development. These data indicate that AOX is primarily responsible for heating, despite FM and SM florets potentially using different substrates, carbohydrates or lipids, respectively. Measurements of discrimination between O2 isotopes in strongly respiring SM florets were affected by diffusion; however, this diffusional limitation was largely overcome using elevated O2. • The first in vivo respiratory flux measurements in an arum show AOX contributes the bulk of heating in P. bipinnatifidum. Fine-scale regulation of AOX activity is post-translational. We also demonstrate that elevated O2 can aid measurement of respiratory pathway fluxes in dense tissues.
[Mh] Termos MeSH primário: Escuridão
Temperatura Alta
Philodendron/fisiologia
[Mh] Termos MeSH secundário: Metabolismo dos Carboidratos
Respiração Celular
Densitometria
Complexo IV da Cadeia de Transporte de Elétrons/metabolismo
Flores/fisiologia
Canais Iônicos/metabolismo
Metabolismo dos Lipídeos
Medições Luminescentes
Proteínas Mitocondriais/metabolismo
Oxirredutases/metabolismo
Philodendron/citologia
Philodendron/enzimologia
Infertilidade das Plantas
Proteínas de Plantas
Amido/metabolismo
Especificidade por Substrato
Termogênese
Triglicerídeos/metabolismo
Proteína Desacopladora 1
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Ion Channels); 0 (Mitochondrial Proteins); 0 (Plant Proteins); 0 (Triglycerides); 0 (Uncoupling Protein 1); 9005-25-8 (Starch); EC 1.- (Oxidoreductases); EC 1.- (alternative oxidase); EC 1.9.3.1 (Electron Transport Complex IV)
[Em] Mês de entrada:1105
[Cu] Atualização por classe:161125
[Lr] Data última revisão:
161125
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:101202
[St] Status:MEDLINE
[do] DOI:10.1111/j.1469-8137.2010.03547.x


  7 / 14 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:20690419
[Au] Autor:Xu YZ; Qiu YL; An ZG; Yang FY
[Ad] Endereço:Department of Stomatology, The Fourth Hospital of Hebei Medical University, Shijiazhuang, China. xu_yanzhi@163.com
[Ti] Título:Role of the Chinese herbal medicine xianhuayin on the reversal of premalignant mucosal lesions in the golden hamster buccal pouch.
[So] Source:Int J Oral Sci;2(1):53-8, 2010 Mar.
[Is] ISSN:1674-2818
[Cp] País de publicação:India
[La] Idioma:eng
[Ab] Resumo:AIM: To investigate the role of the Chinese herbal medicine Xianhuayin on the reversal of 7,12-dimethylbenz[a]anthracene (DMBA)-induced premalignant mucosal lesions in the oral buccal pouch of golden hamsters. METHODOLOGY: The animals were randomly divided into a non-diseased control group (n=5) and an experimental group including 50 animals in which the buccal mucosa had been painted with DMBA (0.5% in acetone) to generate an oral mucosa premalignant lesion. Animals in the experimental group were further divided into Xianhuayin-treated group (n=30), untreated premalignant lesion group (n=10) and normal saline (NS)-treated group (n=10). The cheek (buccal) pouch mucosa of the golden hamsters in each group was observed with light and electron microscopy eight weeks after intragastric administration with NS or Xianhuayin. RESULTS: In the non-diseased control group, the buccal mucosa was keratinized and stratified squamous epithelium under a light microscope. In the untreated premalignant lesion group, variable degrees of epithelial dysplasia was observed. The irregular epithelial mucosa gradually became distinct in the Xianhuayin-treated group. Scanning electronic microscopic (SEM) analysis showed that surface of the cells exhibited honeycomb structures in the hamster of untreated-group. The cells were morphologically irregular, overlapped and loosened in the untreated premalignant lesion group. Most of the cell surface exhibited honeycomb structure in the Xianhuayin-treated group. Transmission electronic microscopic (TEM) analysis showed that buccal mucosal epithelial cells were morphologically regular in the non-diseased control group. Desmosomes and tonofibrils were reduced and the nucleus was morphologically irregular in the untreated premalignant lesion group. In the Xianhuayin-treated group, the widening intercellular gap was gradually reduced, desmosomes and the cells becoming morphologically regular. No significant difference was observed between the hamsters in NS-treated group and those in the untreated premalignant lesion group. Significant therapeutic efficacy was observed in the group receiving Xianhuayin. CONCLUSION: Xianhuayin is effective in the reversal of DMBA-induced premalignant lesions in the buccal pouch of golden hamsters.
[Mh] Termos MeSH primário: Anticarcinógenos/uso terapêutico
Medicamentos de Ervas Chinesas/uso terapêutico
Mucosa Bucal/efeitos dos fármacos
Neoplasias Bucais/prevenção & controle
Lesões Pré-Cancerosas/prevenção & controle
[Mh] Termos MeSH secundário: 9,10-Dimetil-1,2-benzantraceno/efeitos adversos
Amomum
Animais
Anticarcinógenos/administração & dosagem
Carcinógenos
Carthamus tinctorius
Núcleo Celular/efeitos dos fármacos
Cricetinae
Desmossomos/efeitos dos fármacos
Modelos Animais de Doenças
Medicamentos de Ervas Chinesas/administração & dosagem
Células Epiteliais/efeitos dos fármacos
Epitélio/efeitos dos fármacos
Glycyrrhiza
Hiperplasia
Junções Intercelulares/efeitos dos fármacos
Filamentos Intermediários/efeitos dos fármacos
Queratinas
Mesocricetus
Microscopia Eletrônica de Varredura
Microscopia Eletrônica de Transmissão
Mucosa Bucal/patologia
Philodendron
Poria
Distribuição Aleatória
Cloreto de Sódio
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Anticarcinogenic Agents); 0 (Carcinogens); 0 (Drugs, Chinese Herbal); 451W47IQ8X (Sodium Chloride); 57-97-6 (9,10-Dimethyl-1,2-benzanthracene); 68238-35-7 (Keratins)
[Em] Mês de entrada:1009
[Cu] Atualização por classe:151119
[Lr] Data última revisão:
151119
[Sb] Subgrupo de revista:D; IM
[Da] Data de entrada para processamento:100810
[St] Status:MEDLINE
[do] DOI:10.4248/IJOS10013


  8 / 14 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:19167900
[Au] Autor:Hong JH; Chung G; Cowan AK
[Ad] Endereço:Biotech Institute, Glonet BU, Doosan Corporation, Yongin, South Korea.
[Ti] Título:Delayed leaf senescence by exogenous lyso-phosphatidylethanolamine: towards a mechanism of action.
[So] Source:Plant Physiol Biochem;47(6):526-34, 2009 Jun.
[Is] ISSN:1873-2690
[Cp] País de publicação:France
[La] Idioma:eng
[Ab] Resumo:Exogenous application of the lysophospholipid, lyso-phosphatidylethanolamine (LPE) is purported to delay leaf senescence in plants. However, lyso-phospholipids are well known to possess detergent-like activity and application of LPE to plant tissues might be expected to rather elicit a wound-like response and enhance senescence progression. Since phosphatidic acid (PA) accumulation and leaf cell death are a consequence of wounding, PA- and hormone-induced senescence was studied in leaf discs from Philodendron cordatum (Vell.) Kunth plants in the presence or absence of egg-derived 18:0-LPE and senescence progression quantified by monitoring both lipid peroxidation (as the change in malondialdehyde concentration), and by measuring retention of total chlorophyll (Chl(a+b)) and carotenoids (C(c+x)). Only abscisic acid (ABA) stimulated lipid peroxidation whereas ABA, 1-aminocyclopropane-1-carboxylic acid (ACC), the immediate precursor to ethylene (ETH), and 16:0-18:2-PA stimulated loss of chloroplast pigments. Results using primary alcohols as attenuators of the endogenous PA signal confirmed a role for PA as an intermediate in both ABA- and ETH-mediated senescence progression. Exogenous 18:0-LPE did not appear to influence senescence progression and was unable to reverse hormone-induced senescence progression. However, when supplied together with 16:0-18:2-PA at 1:1 (mol:mol), activity of phosphatidylglycerol (PG) hydrolase, chlorophyllase (E.C. 3.1.1.14), and progression of leaf senescence were negated. This apparent anti-senescence activity of exogenous 18:0-LPE was associated with induction of the pathogenesis-related protein, extracellular acid invertase (Ac INV, E.C. 3.2.1.26) suggesting that 18:0-LPE like 16:0-18:2-PA functions as an elicitor.
[Mh] Termos MeSH primário: Lisofosfolipídeos/metabolismo
Philodendron/metabolismo
Ácidos Fosfatídicos/metabolismo
Folhas de Planta/metabolismo
[Mh] Termos MeSH secundário: Ácido Abscísico/metabolismo
Aciltransferases/metabolismo
Aminoácidos Cíclicos/metabolismo
Hidrolases de Éster Carboxílico/metabolismo
Carotenoides/metabolismo
Clorofila/metabolismo
Etilenos/metabolismo
Peroxidação de Lipídeos
Malondialdeído/metabolismo
Philodendron/fisiologia
Reguladores de Crescimento de Planta/metabolismo
Folhas de Planta/fisiologia
Transdução de Sinais
beta-Frutofuranosidase/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Amino Acids, Cyclic); 0 (Ethylenes); 0 (Lysophospholipids); 0 (Phosphatidic Acids); 0 (Plant Growth Regulators); 0 (lysophosphatidylethanolamine); 1406-65-1 (Chlorophyll); 36-88-4 (Carotenoids); 3K9EJ633GL (1-aminocyclopropane-1-carboxylic acid); 4Y8F71G49Q (Malondialdehyde); 72S9A8J5GW (Abscisic Acid); 91GW059KN7 (ethylene); EC 2.3.- (Acyltransferases); EC 3.1.1.- (Carboxylic Ester Hydrolases); EC 3.1.1.14 (chlorophyllase); EC 3.2.1.26 (beta-Fructofuranosidase)
[Em] Mês de entrada:0910
[Cu] Atualização por classe:161020
[Lr] Data última revisão:
161020
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:090127
[St] Status:MEDLINE
[do] DOI:10.1016/j.plaphy.2008.12.014


  9 / 14 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:18375932
[Au] Autor:Seymour RS; Gibernau M
[Ad] Endereço:Ecology and Evolutionary Biology, University of Adelaide, Adelaide, S.A. 5005, Australia. roger.seymour@adelaide.edu.au
[Ti] Título:Respiration of thermogenic inflorescences of Philodendron melinonii: natural pattern and responses to experimental temperatures.
[So] Source:J Exp Bot;59(6):1353-62, 2008.
[Is] ISSN:1460-2431
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The patterns of temperature and respiratory changes in the protogynous inflorescences of Philodendron melinonii (Araceae) were studied in the field in French Guiana. These are the first respiratory measurements from a member of the large subgenus Philodendron, a group previously thought to lack thermoregulatory inflorescences, in contrast to thermoregulatory Philodendron species of the subgenus Meconostigma. Heating by the male and sterile male florets was strong on the first evening of anthesis when beetles are attracted and the female florets are receptive. Heat production of the inflorescence peaked at approximately 0.9 W and spadix temperature reached approximately 39.5 degrees C, a level somewhat independent of ambient temperature. Thermogenesis continued throughout the night and the next day, but at a lower level, and floral temperatures fell. On the second evening, when pollen was shed, there was a small elevation in respiration and spadix temperature. Responses of cut spadix sections to experimental step changes in ambient temperature resulted in a prompt response in floral temperature and respiration rate in the direction of the change and then a much slower regulatory adjustment in the opposite direction. These responses are consistent with an immediate van 't Hoff effect, followed by up- or down-regulation of thermogenesis. However, the responses required several hours. It is concluded that the male floret tissues possess the same thermoregulatory mechanism of more precise thermoregulatory species, but a combination of small spadix size (that favours heat loss), moderate thermogenic capacity (that limits heating rate), and slow reaction time (that causes long lags between temperature change and the regulatory response) result in poor thermoregulatory performance during the second day.
[Mh] Termos MeSH primário: Philodendron/fisiologia
[Mh] Termos MeSH secundário: Animais
Dióxido de Carbono/metabolismo
Respiração Celular
Flores/fisiologia
Pólen/metabolismo
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
142M471B3J (Carbon Dioxide)
[Em] Mês de entrada:0806
[Cu] Atualização por classe:131121
[Lr] Data última revisão:
131121
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:080401
[St] Status:MEDLINE
[do] DOI:10.1093/jxb/ern042


  10 / 14 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:18356291
[Au] Autor:Barabé D; Lacroix C; Jeune B
[Ad] Endereço:Institut de recherche en biologie végétale, Jardin botanique de Montréal, Université de Montréal, 4101 Sherbrooke Est, Montréal, H1X 2B2, Canada. denis.barabe@umontreal.ca
[Ti] Título:Quantitative developmental analysis of homeotic changes in the inflorescence of Philodendron (Araceae).
[So] Source:Ann Bot;101(7):1027-34, 2008 May.
[Is] ISSN:1095-8290
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND AND AIMS: The inflorescence of Philodendron constitutes an interesting morphological model to analyse the phenomenon of homeosis quantitatively at the floral level. The specific goals of this study were (1) to characterize and quantify the range of homeotic transformation in Philodendron billietiae, and (2) to test the hypothesis that the nature of flowers surrounding atypical bisexual flowers (ABFs) channel the morphological potentialities of atypical bisexual flowers. METHODS: Inflorescences of P. billietiae at different stages of development were observed using SEM. The number of appendices in male, female and sterile flowers were counted on 11 young inflorescences (5-6 flowers per inflorescence). The number of staminodes and carpels on ABFs were counted on 19 inflorescences (n = 143). These data were used for regression and ANOVA analyses. RESULTS: There was an average of 4.1 stamens per male flower, 9.8 carpels per female flower and 6.8 staminodes per sterile male flower. There was an average of 7.3 floral appendices per atypical flower. Staminodes and carpels are inserted on the same whorl in ABFs. A negative exponential relationship was found between the average number of staminodes and the number of carpels in ABFs. If only the ABFs consisting of less than six carpels are considered, there is a linear relationship between the number of carpels and the average number of staminodes. The value of the slope of the regression equation indicates that on average, in P. billietiae, 1.36 carpels are replaced by one staminode. CONCLUSIONS: In P. billietiae, the number of appendages in female flowers imposes a constraint on the maximum total number of appendages (carpels and staminodes) that can develop on ABFs. The quantitative analyses indicate that the average number of different types of floral appendages on an ABF and the number of organs involved in a homeotic transformation are two independent phenomena.
[Mh] Termos MeSH primário: Flores/crescimento & desenvolvimento
Philodendron/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Análise de Variância
Flores/fisiologia
Flores/ultraestrutura
Microscopia Eletrônica de Varredura
Philodendron/fisiologia
Philodendron/ultraestrutura
Reprodução/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:0808
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:080322
[St] Status:MEDLINE
[do] DOI:10.1093/aob/mcn031



página 1 de 2 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