Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.912.250.150.750 [Categoria DeCS]
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  1 / 12 MEDLINE  
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[PMID]:26732490
[Au] Autor:Meeus S; Janssens S; Helsen K; Jacquemyn H
[Ad] Endereço:KU Leuven, Department of Biology, Plant Population and Conservation Biology, Kasteelpark Arenberg 31, 3001 Heverlee, Belgium; Biological and Environmental Sciences, University of Stirling, Stirling FK9 4LA, UK. Electronic address: sofie.meeus@stir.ac.uk.
[Ti] Título:Evolutionary trends in the distylous genus Pulmonaria (Boraginaceae): Evidence of ancient hybridization and current interspecific gene flow.
[So] Source:Mol Phylogenet Evol;98:63-73, 2016 May.
[Is] ISSN:1095-9513
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The distylous genus Pulmonaria contains approximately 18 species that are widely distributed across Eurasia. Previous studies have shown that species delimitation in the genus is problematic, but have not yet explored the evolutionary history of the genus. Premating reproductive barriers between European species appear to be weak, as several species have strongly overlapping distribution areas, flower at the same time and share the same pollinators, suggesting that hybridization may have contributed to the evolutionary history of Pulmonaria. To test this hypothesis, phylogenetic analyses of nuclear ITS and plastid data (rps16, trnH-psbA, rpl16) from 48 allopatric and four sympatric populations were performed to (1) provide a molecular phylogeny for nine of the most common Pulmonaria species in Europe, (2) detect current and ancient hybridization events, and (3) assess the contribution of hybridization versus incomplete lineage sorting to the inferred phylogenetic patterns. Our results showed that gene trees displayed widespread, strongly supported incongruence associated with the conflicting position of hybrid samples rather than incomplete lineage sorting. Evidence was found of different degrees of hybridization, ranging from current interspecific gene flow at secondary contact zones to introgression at the population level and at least one event of hybrid speciation. Overall, these results suggest that hybridization and introgression were - and could still be - important processes affecting speciation in the genus Pulmonaria.
[Mh] Termos MeSH primário: Evolução Molecular
Fluxo Gênico/genética
Hibridização Genética
Filogenia
Pulmonaria/classificação
Pulmonaria/genética
[Mh] Termos MeSH secundário: Europa (Continente)
Plastídeos/genética
Especificidade da Espécie
Simpatria
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1610
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160107
[St] Status:MEDLINE


  2 / 12 MEDLINE  
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[PMID]:24134743
[Au] Autor:Meeus S; Honnay O; Jacquemyn H
[Ad] Endereço:Plant Conservation and Population Biology, Biology Department, University of Leuven, Kasteelpark Arenberg 31, Heverlee, 3001, Belgium. sofie.meeus@bio.kuleuven.be.
[Ti] Título:Differences in fine-scale spatial genetic structure across the distribution range of the distylous forest herb Pulmonaria officinalis (Boraginaceae).
[So] Source:BMC Genet;14:101, 2013 Oct 18.
[Is] ISSN:1471-2156
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Geographical ranges of plants and their pollinators do not always entirely overlap and it has been suggested that the absence of specialized pollinators at range margins may induce changes in mating systems. Because a species' mating system is known to have a considerable effect on within-population pollen movement, the extent of fine-scale spatial genetic structure (SGS) can be expected to differ between populations located at different parts of their geographical range. To test this prediction, we compared the fine-scale SGS between two core and two disjunct populations of the distylous forest herb Pulmonaria officinalis. Because in disjunct populations of this species the heteromorphic self-incompatibility system showed relaxation in the long-styled morph, but not in the short-styled morph, we also hypothesized that the extent of fine-scale SGS and clustering differed between morphs. RESULTS: Spatial autocorrelation analyses showed a significant decrease in genetic relatedness with spatial distance for both core and disjunct populations with the weakest SGS found in one of the core populations (Sp = 0.0014). No evidence of stronger SGS in the long-styled morph was found in the center of the range whereas one disjunct population showed a significantly (P = 0.029) higher SGS in the long-styled morph (SpL = 0.0070) than in the short-styled morph (SpS = 0.0044). CONCLUSIONS: Consistent with previous analyses on distylous plant species, we found weak, but significant spatial genetic structure. However, the extent of SGS varied substantially between populations within regions, suggesting that population characteristics other than mating system (e.g. local pollinator assemblages, population history) may be as important in determining variation in SGS.
[Mh] Termos MeSH primário: Genes de Plantas
Variação Genética
Pulmonaria/genética
[Mh] Termos MeSH secundário: Flores/genética
Genética Populacional
Repetições de Microssatélites
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1406
[Cu] Atualização por classe:170922
[Lr] Data última revisão:
170922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:131019
[St] Status:MEDLINE
[do] DOI:10.1186/1471-2156-14-101


  3 / 12 MEDLINE  
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[PMID]:23536759
[Au] Autor:Jacquemyn H; Lenaerts M; Brys R; Willems K; Honnay O; Lievens B
[Ad] Endereço:Division of Plant Ecology and Systematics, Biology Department, KU Leuven, Heverlee, Belgium. hans.jacquemyn@bio.kuleuven.be
[Ti] Título:Among-population variation in microbial community structure in the floral nectar of the bee-pollinated forest herb Pulmonaria officinalis L.
[So] Source:PLoS One;8(3):e56917, 2013.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Microbial communities in floral nectar have been shown to be characterized by low levels of species diversity, yet little is known about among-plant population variation in microbial community composition. METHODOLOGY/PRINCIPAL FINDINGS: We investigated the microbial community structure (yeasts and bacteria) in floral nectar of ten fragmented populations of the bee-pollinated forest herb Pulmonaria officinalis. We also explored possible relationships between plant population size and microbial diversity in nectar, and related microbial community composition to the distance separating plant populations. Culturable bacteria and yeasts occurring in the floral nectar of a total of 100 plant individuals were isolated and identified by partially sequencing the 16S rRNA gene and D1/D2 domains of the 26S rRNA gene, respectively. A total of 9 and 11 yeast and 28 and 39 bacterial OTUs was found, taking into account a 3% (OTU0.03) and 1% sequence dissimilarity cut-off (OTU0.01). OTU richness at the plant population level (i.e. the number of OTUs per population) was low for yeasts (mean: 1.7, range: 0-4 OTUs0.01/0.03 per population), whereas on average 6.9 (range: 2-13) OTUs0.03 and 7.9 (range 2-16) OTUs0.01 per population were found for bacteria. Both for yeasts and bacteria, OTU richness was not significantly related to plant population size. Similarity in community composition among populations was low (average Jaccard index: 0.14), and did not decline with increasing distance between populations. CONCLUSIONS/SIGNIFICANCE: We found low similarity in microbial community structure among populations, suggesting that the assembly of nectar microbiota is to a large extent context-dependent. Although the precise factors that affect variation in microbial community structure in floral nectar require further study, our results indicate that both local and regional processes may contribute to among-population variation in microbial community structure in nectar.
[Mh] Termos MeSH primário: Abelhas
Microbiota
Néctar de Plantas
Polinização
Pulmonaria/microbiologia
[Mh] Termos MeSH secundário: Animais
Bactérias/classificação
Bactérias/genética
Bactérias/isolamento & purificação
Abelhas/fisiologia
Bélgica
Biodiversidade
Dados de Sequência Molecular
Filogenia
RNA Ribossômico 16S/genética
Árvores
Leveduras/classificação
Leveduras/genética
Leveduras/isolamento & purificação
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Plant Nectar); 0 (RNA, Ribosomal, 16S)
[Em] Mês de entrada:1312
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:130329
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0056917


  4 / 12 MEDLINE  
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[PMID]:23092991
[Au] Autor:Meeus S; Honnay O; Jacquemyn H
[Ad] Endereço:Plant Conservation and Population Biology, Biology Department, University of Leuven, Kasteelpark Arenberg 31, 3001 Heverlee, Belgium. sofi e.meeus@bio.kuleuven.be
[Ti] Título:Strong differences in genetic structure across disjunct, edge, and core populations of the distylous forest herb Pulmonaria officinalis (Boraginaceae).
[So] Source:Am J Bot;99(11):1809-18, 2012 Nov.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Populations at the edge of a species' distribution area are often small and have low levels of gene flow resulting in lower genetic variation and higher differentiation compared to core populations. This study examined genetic variation among populations of the distylous temperate forest herb Pulmonaria officinalis located in the core, the edge, and outside the species' main distribution range. METHODS: We compared patterns of genetic variation for eight microsatellite loci between disjunct (Belgium), edge (western Germany), and core (eastern Germany) populations of P. officinalis. KEY RESULTS: Disjunct populations contained only a subset of alleles found in edge and core populations and had significantly lower within-population genetic variation. No significant differences, however, in within-population genetic variation were found between edge and core populations, except for allelic and genotypic richness. Genetic differentiation was highest among disjunct (F(ST) = 0.11) and lowest among core populations (F(ST) = 0.03). Significant (P < 0.01) isolation by distance was found for disjunct and edge populations (r(M) = 0.29 and 0.50, respectively), but not for core populations (r(M) = 0.18). CONCLUSIONS: The results are best interpreted from a "dynamic range" point of view in which the observed low levels of genetic diversity and high genetic differentiation in disjunct populations are best explained through historical processes, most likely the introduction of the species in medieval times. Lower levels of gene flow caused by the pronounced fragmentation of forests in Belgium may further have contributed to the genetic structure of P. officinalis in these disjunct populations.
[Mh] Termos MeSH primário: Variação Genética
Repetições de Microssatélites/genética
Pulmonaria/crescimento & desenvolvimento
Pulmonaria/genética
[Mh] Termos MeSH secundário: Alelos
Análise de Variância
Bélgica
Biodiversidade
DNA de Plantas/química
DNA de Plantas/genética
Flores/anatomia & histologia
Flores/genética
Flores/crescimento & desenvolvimento
Fluxo Gênico
Genótipo
Geografia
Alemanha
Modelos Genéticos
Pulmonaria/anatomia & histologia
Análise de Sequência de DNA
Árvores/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (DNA, Plant)
[Em] Mês de entrada:1305
[Cu] Atualização por classe:121112
[Lr] Data última revisão:
121112
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:121025
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1200223


  5 / 12 MEDLINE  
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[PMID]:22021814
[Au] Autor:Meeus S; Honnay O; Brys R; Jacquemyn H
[Ad] Endereço:Laboratory of Plant Ecology, University of Leuven, Kasteelpark Arenberg 31, 3001 Heverlee, Belgium. sofie.meeus@bio.kuleuven.be
[Ti] Título:Biased morph ratios and skewed mating success contribute to loss of genetic diversity in the distylous Pulmonaria officinalis.
[So] Source:Ann Bot;109(1):227-35, 2012 Jan.
[Is] ISSN:1095-8290
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND AND AIMS: In heterostylous plant species, skewed morph ratios are not uncommon and may arise from a range of factors. Despite the recognized importance of skewed morph ratios on overall reproductive success within populations, little is known about the impact of skewed morph ratios on population genetic diversity and differentiation in heterostylous species. This study specifically aimed to clarify the effect of population size and morph bias on population genetic diversity and differentiation in the temperate forest herb Pulmonaria officinalis. This species is characterized by a distylous breeding system and shows morph-specific differences in reproductive success. METHODS: Genetic diversity was determined for 27 P. officinalis populations in northern Belgium by using eight recently developed microsatellite markers. Multiple regressions were used to assess the relationship between genetic diversity, morph bias and population size, and F(ST)-values were calculated for short- and long-styled morphs separately to study genetic differentiation as a function of morph type. KEY RESULTS: For all genetic measures used, morph bias was more important in explaining patterns of genetic diversity than population size, and in all cases patterns of population genetic diversity followed a quadratic function, which showed a symmetrical decrease in genetic diversity with increasing morph bias. However, probably due to the reproductive advantage of L-morphs relative to S-morphs, maximum genetic diversity was found in populations showing an excess of L-morphs (60·7 % L-morph). On the other hand, no significant difference in pairwise genetic distances between populations was observed between L- (0·107) and S-morphs (0·106). CONCLUSIONS: Our results indicate that significant deviations from equal morph ratios not only affect plant reproductive success but also population genetic diversity of heterostylous plant species. Hence, when defining conservation measures for populations of heterostylous plant species, morph ratios should be considered as an important trait affecting their long-term population viability.
[Mh] Termos MeSH primário: Flores/anatomia & histologia
Flores/genética
Pulmonaria/anatomia & histologia
Pulmonaria/genética
[Mh] Termos MeSH secundário: Bélgica
Evolução Biológica
Variação Genética
Genética Populacional
Reprodução/genética
Reprodução/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1205
[Cu] Atualização por classe:170922
[Lr] Data última revisão:
170922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:111025
[St] Status:MEDLINE
[do] DOI:10.1093/aob/mcr272


  6 / 12 MEDLINE  
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[PMID]:22164787
[Au] Autor:Papp N; Bencsik T; Németh K; Gyergyák K; Sulc A; Farkas A
[Ad] Endereço:Department of Pharmacognosy, University of Pécs, 7624 Pécs, Hungary. nora.papp@aok.pte.hu
[Ti] Título:Histological study of some Echium vulgare, Pulmonaria officinalis and Symphytum officinale populations.
[So] Source:Nat Prod Commun;6(10):1475-8, 2011 Oct.
[Is] ISSN:1934-578X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Plants living in different ecological habitats can show significant variability in their histological and phytochemical characters. The main histological features of various populations of three medicinal plants from the Boraginaceae family were studied. Stems, petioles and leaves were investigated by light microscopy in vertical and transverse sections. The outline of the epidermal cells, as well as the shape and cell number of trichomes was studied in leaf surface casts. Differences were measured among the populations of Echium vulgare in the width and height of epidermis cells in the stem, petiole and leaf, as well as in the size of palisade cells in the leaves. Among the populations of Pulmonaria officinalis significant differences were found in the length of trichomes and in the slightly or strongly wavy outline of epidermal radial cell walls. Populations of Symphytum officinale showed variance in the height of epidermal cells in leaves and stems, length of palisade cells and number of intercellular spaces in leaves, and the size of the central cavity in the stem. Boraginaceae bristles were found to be longer in plants in windy/shady habitats as opposed to sunny habitats, both in the leaves and stems ofP. officinalis and S. officinale, which might be connected to varying levels of exposure to wind. Longer epidermal cells were detected in the leaves and stems of both E. vulgare and S. officinale plants living in shady habitats, compared with shorter cells in sunny habitats. Leaf mesophyll cells were shorter in shady habitats as opposed to longer cells in sunny habitats, both in E. vulgare and S. officinale. This combination of histological characters may contribute to the plant's adaptation to various amounts of sunshine. The reported data prove the polymorphism of the studied taxa, as well as their ability to adapt to various ecological circumstances.
[Mh] Termos MeSH primário: Confrei/citologia
Echium/citologia
Folhas de Planta/citologia
Pulmonaria/citologia
[Mh] Termos MeSH secundário: Hidrocarbonetos Aromáticos Policíclicos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Polycyclic Aromatic Hydrocarbons); 0 (TLN 05220)
[Em] Mês de entrada:1202
[Cu] Atualização por classe:161125
[Lr] Data última revisão:
161125
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:111215
[St] Status:MEDLINE


  7 / 12 MEDLINE  
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[PMID]:20636902
[Au] Autor:Brys R; Jacquemyn H
[Ad] Endereço:Research Institute for Nature and Forest, Brussels, Belgium. rein.brys@inbo.be
[Ti] Título:Floral display size and spatial distribution of potential mates affect pollen deposition and female reproductive success in distylous Pulmonaria officinalis (Boraginaceae).
[So] Source:Plant Biol (Stuttg);12(4):597-603, 2010 Jul 01.
[Is] ISSN:1438-8677
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In animal-pollinated plants, both the spatial distribution of flowering individuals and the number of flowers that an individual displays affect pollen deposition rates and female reproductive success. Heterostylous species are likely to be particularly sensitive to the contingencies of spatial distribution, as they are reproductively subdivided into distinct mating groups, which usually exhibit self- and intra-morph incompatibility and differ in floral morphology. In this paper, we explore the joint effects of both spatial distribution of potential mates and floral display size on morph-specific pollen deposition rates and seed set patterns in two natural populations of Pulmonaria officinalis, a distylous species with a weak self-incompatibility system. Both total stigmatic pollen load and the proportion of legitimate pollen decreased with increasing spatial isolation. Legitimate (intermorph) pollen transfer was, however, asymmetric and decreased more rapidly with decreasing proximity to a compatible legitimate mating partner in the S-morph than in the L-morph. Total stigmatic pollen loads per flower increased with increasing floral display size, indicating that large plants are disproportionately more visited than smaller individuals. However, because legitimate pollen deposition decreased with increasing floral display size, these results also suggest that larger numbers of flowers increase the degree of geitonogamous pollination. In both the L- and S-morph, seed set significantly decreased with increasing isolation from a legitimate mating partner, but in the L-morph seed set was less dependent on the spatial distribution of the S-morph. In addition, seed set significantly increased with floral display size in the L-morph, but not in the S-morph. These findings indicate that the spatial distribution of potential mates and variation in floral display size may cause morph-specific differences in pollen deposition rates and female reproductive success.
[Mh] Termos MeSH primário: Flores/anatomia & histologia
Polinização
Pulmonaria/fisiologia
[Mh] Termos MeSH secundário: Bélgica
Flores/fisiologia
Modelos Lineares
Pólen/fisiologia
Pulmonaria/anatomia & histologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1009
[Cu] Atualização por classe:100719
[Lr] Data última revisão:
100719
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:100720
[St] Status:MEDLINE
[do] DOI:10.1111/j.1438-8677.2009.00259.x


  8 / 12 MEDLINE  
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[PMID]:20229251
[Au] Autor:Fernández-Marín B; Becerril JM; García-Plazaola JI
[Ad] Endereço:Departamento de Biología Vegetal y Ecología, Universidad del País Vasco, Aptdo 644, 48080 Bilbao, Spain. beatriz_fernandez@ehu.es
[Ti] Título:Unravelling the roles of desiccation-induced xanthophyll cycle activity in darkness: a case study in Lobaria pulmonaria.
[So] Source:Planta;231(6):1335-42, 2010 May.
[Is] ISSN:1432-2048
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Desiccation-tolerance ability in photosynthetic organisms is largely based on a battery of photoprotective mechanisms. Xanthophyll cycle operation induced by desiccation in the absence of light has been previously proven in the desiccation-tolerant fern Ceterach officinarum. To understand the physiological function of xanthophyll cycle induction in darkness and its implication in the desiccation tolerance in more detail, we studied its triggering factors and its photochemical effects in the lichen Lobaria pulmonaria. We found that both the drying rate and the degree of desiccation play a crucial role in the violaxanthin de-epoxidase activation. De-epoxidation of violaxanthin to zeaxanthin (Z) occurs when the tissue has lost most of its water and only after slow dehydration, suggesting that a minimum period of time is required for the enzyme activity induction. Fluorescence analysis showed that Z, synthesised during tissue dehydration in the absence of light, prevents photoinhibition when rewatered tissues are illuminated. This is probably due to Z implication in both non-photochemical quenching and/or antioxidative responses.
[Mh] Termos MeSH primário: Escuridão
Dessecação
Pulmonaria/metabolismo
Xantofilas/metabolismo
[Mh] Termos MeSH secundário: Clorofila/metabolismo
Ecossistema
Fluorescência
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Xanthophylls); 1406-65-1 (Chlorophyll)
[Em] Mês de entrada:1006
[Cu] Atualização por classe:171005
[Lr] Data última revisão:
171005
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:100316
[St] Status:MEDLINE
[do] DOI:10.1007/s00425-010-1129-6


  9 / 12 MEDLINE  
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[PMID]:19275866
[Au] Autor:Biber A; Franck-Karl G; Waimer F; Riegert U; Wiget R
[Ad] Endereço:Deutsche Homöopathie-Union (DHU), Ottostrasse 24, 76227 Karlsruhe, Germany. anton.biber@dhu.de
[Ti] Título:Analytical characterisation of homoeopathic mother tinctures.
[So] Source:Pharmeur Sci Notes;2009(1):1-4, 2009 Mar.
[Is] ISSN:1814-2435
[Cp] País de publicação:France
[La] Idioma:eng
[Ab] Resumo:Quality of homoeopathic mother tinctures is assured by the definition of the starting material, the manufacturing process and the analytical characteristics described in the monograph. Traditionally analytical characterisation of the mother tincture comprises appearance, odour, identity, density and dry residue. According to annex I of directive 2001/83/EC an assay is only performed in case of a health hazard due to toxic compounds. The concept of marker substances as usually used in phytotherapy cannot be transferred to mother tinctures without research effort. For example the marker substances echinacoside, apigenin-7-glucoside and rosmarinic acid found in dried underground parts of Echinacea pallida Nutt., dried flower heads of Matricaria recutita L. and dried herb of Pulmonaria officinalis L. cannot be found in homoeopathic mother tinctures prepared from fresh material thereof.
[Mh] Termos MeSH primário: Materia Medica/análise
[Mh] Termos MeSH secundário: Cromatografia Líquida
Cromatografia em Camada Delgada
Echinacea/química
Flavonoides/análise
Alemanha
Homeopatia/normas
Matricaria/química
Soluções Farmacêuticas
Farmacopeias Homeopáticas
Fenóis/análise
Preparações de Plantas/análise
Polifenóis
Pulmonaria/química
Padrões de Referência
Soluções
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Flavonoids); 0 (Materia Medica); 0 (Pharmaceutical Solutions); 0 (Phenols); 0 (Plant Preparations); 0 (Polyphenols); 0 (Solutions)
[Em] Mês de entrada:0905
[Cu] Atualização por classe:111117
[Lr] Data última revisão:
111117
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:090312
[St] Status:MEDLINE


  10 / 12 MEDLINE  
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[PMID]:18180073
[Au] Autor:Esteban R; Fernández-Marín B; Becerril JM; García-Plazaola JI
[Ad] Endereço:Department of Plant Biology and Ecology, UPV/EHU, Apdo. 644, 48080 Bilbao, Spain. bcbester@ehu.es
[Ti] Título:Photoprotective implications of leaf variegation in E. dens-canis L. and P. officinalis L.
[So] Source:J Plant Physiol;165(12):1255-63, 2008 Aug 25.
[Is] ISSN:1618-1328
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Variegated leaves occur rarely in nature, but there are some species, primarily in the forest understory, that possess this characteristic. We recently studied two variegated plants: Erytronium dens-canis L., which is characterised by a pattern of red patches and Pulmonaria officinalis L., with light green spots. These non-green areas could attenuate light reaching mesophyll cells with respect to green sections. The aim of the study was to verify whether such red and light green parts are more photoprotected than green ones and if this trait could be of adaptive value. Red patches in E. dens-canis were due to a single layer of red cells in the upper parenchyma, which accumulated anthocyanins. Light green spots in P. officinalis were caused by the presence of loosely arranged cells instead of a well-established layer of packed cells in the palisade parenchyma. Chlorophyll fluorescence imaging was performed under light treatment, showing a greater decrease of photochemical efficiency in red and light green patches than in green sections. Differences in the extent of photochemical efficiency among patches were not attributable to different activation of the xanthophyll cycle. These observations failed to confirm our initial hypothesis, but they questioned the physiological reason for this higher sensitivity in red and light green patches of photosynthetic tissues. Chlorophyll fluorescence imaging was therefore performed in the field. The same pattern of photochemical efficiency was maintained only in E. dens-canis. The current results demonstrate that in both species the benefits of variegation, if any, are different from enhanced photosynthetic performance.
[Mh] Termos MeSH primário: Luz
Liliaceae/fisiologia
Folhas de Planta/fisiologia
Folhas de Planta/efeitos da radiação
Pulmonaria/fisiologia
[Mh] Termos MeSH secundário: Clorofila/fisiologia
Ecossistema
Fluorescência
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
1406-65-1 (Chlorophyll)
[Em] Mês de entrada:0905
[Cu] Atualização por classe:080804
[Lr] Data última revisão:
080804
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:080109
[St] Status:MEDLINE
[do] DOI:10.1016/j.jplph.2007.07.024



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