Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.912.250.100.255 [Categoria DeCS]
Referências encontradas : 49 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 5 ir para página              

  1 / 49 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28009887
[Au] Autor:Constantino LF; Nascimento LB; Casanova LM; Moreira ND; Menezes EA; Esteves RL; Costa SS; Tavares ES
[Ad] Endereço:Instituto de Biologia, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, Brazil. elianast@gmail.com.
[Ti] Título:Responses of Crepis japonica induced by supplemental blue light and UV-A radiation.
[So] Source:Photochem Photobiol Sci;16(2):238-245, 2017 02 15.
[Is] ISSN:1474-9092
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Crepis japonica (L.) D.C. (Asteraceae), a weed with antioxidant, antiallergenic, antiviral and antitumor properties displays both medicinal properties and nutritional value. This study aims to assess the effects of a supplementation of blue light and UV-A radiation on the growth, leaf anatomical structure and phenolic profile of the aerial parts of Crepis japonica. Plants were grown under two light treatments: W (control - white light), W + B (white light supplemented with blue light) and W + UV-A (white light supplemented with UV-A radiation). We recorded the length, width, and weight of fresh and dry leaves, the thickness of the epidermis and mesophyll, and stomata density. The phenolic profiles of the aqueous extracts of the aerial parts were analyzed by HPLC-DAD. There was an increase in the leaf size, stomatal density, and phenolic production, and a thickening of the mesophyll and epidermis. UV-A radiation increased the phenolic production more than blue light. Blue light and UV-A radiation both improved the production of caffeic acid by about 6 and 3 times, respectively, in comparison to control. This compound was first reported as a constituent of the extract from the aerial parts together with caftaric acid. UV-A also promoted the production of chlorogenic acid (about 1.5 times in comparison to the control). We observed that the morphological and chemical parameters of C. japonica are modified in response to blue light and UV-A radiation, which can be used as tools in the cultivation of this species in order to improve its medicinal properties and nutritional value.
[Mh] Termos MeSH primário: Crepis/efeitos da radiação
Luz
Raios Ultravioleta
[Mh] Termos MeSH secundário: Ácido Clorogênico/química
Ácido Clorogênico/isolamento & purificação
Ácido Clorogênico/metabolismo
Cromatografia Líquida de Alta Pressão
Crepis/química
Crepis/metabolismo
Fenóis/química
Fenóis/isolamento & purificação
Fenóis/metabolismo
Componentes Aéreos da Planta/química
Componentes Aéreos da Planta/metabolismo
Extratos Vegetais/análise
Extratos Vegetais/química
Folhas de Planta/química
Folhas de Planta/metabolismo
Folhas de Planta/efeitos da radiação
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Phenols); 0 (Plant Extracts); 318ADP12RI (Chlorogenic Acid); WCV7W3174L (caftaric acid)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161224
[St] Status:MEDLINE
[do] DOI:10.1039/c6pp00343e


  2 / 49 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27313196
[Au] Autor:Sears CJ; Whitton J
[Ad] Endereço:Department of Botany and Biodiversity Research Centre, The University of British Columbia, 3529-6270 University Boulevard, Vancouver, British Columbia V6T 1Z4 Canada fundywest@mac.com.
[Ti] Título:A reexamination of the North American Crepis agamic complex and comparison with the findings of Babcock and Stebbins' classic biosystematic monograph.
[So] Source:Am J Bot;103(7):1289-99, 2016 07.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Babcock and Stebbins coined the term agamic complex in their 1938 monograph of the North American Crepis agamic complex. Despite the historical role that this complex holds in the evolutionary literature, it has not been reexamined in over 75 years. We present a thorough reevaluation of the complex to test hypotheses proposed by Babcock and Stebbins about its origins and spread, the relationships of diploids, and the nature and origins of polyploids. METHODS: We used flow cytometry to infer ploidy of roughly 600 samples spanning the morphological and taxonomic diversity of the complex and a phylogenetic analysis of plastid DNA variation to infer maternal relationships among diploids and to infer maternal origins of polyploids. KEY RESULTS: We identified populations of all seven recognized diploids plus one new lineage. Phylogenetic analysis of plastid DNA variation in diploids revealed a well-resolved, but moderately supported phylogeny, with evidence for monophyly of the North America Crepis agamic complex and no evidence of widespread homoploid hybridization. Polyploids showed evidence of multiple origins and a pattern of frequent local co-occurrence consistent with repeated colonization of suitable sites. CONCLUSIONS: Our findings agree broadly with the distribution and variation of ploidy within and among species described by Babcock and Stebbins. One key difference is finding support for monophyly of North American species, and refuting their hypothesis of polyphyly. Our results provide an explicit phylogenetic framework for further study of this classic agamic complex.
[Mh] Termos MeSH primário: Crepis/genética
Genoma de Planta/genética
Ploidias
[Mh] Termos MeSH secundário: Evolução Biológica
Diploide
Genética Populacional
Haplótipos
Hibridização Genética
América do Norte
Filogenia
Plastídeos/genética
Poliploidia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1707
[Cu] Atualização por classe:171121
[Lr] Data última revisão:
171121
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160618
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1600057


  3 / 49 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27091508
[Au] Autor:Adamidis GC; Kazakou E; Aloupi M; Dimitrakopoulos PG
[Ad] Endereço:Biodiversity Conservation Laboratory, Department of Environment, University of the Aegean, 81100 Mytilene, Lesbos, Greece adamidis@env.aegean.gr.
[Ti] Título:Is it worth hyperaccumulating Ni on non-serpentine soils? Decomposition dynamics of mixed-species litters containing hyperaccumulated Ni across serpentine and non-serpentine environments.
[So] Source:Ann Bot;117(7):1241-8, 2016 Jun.
[Is] ISSN:1095-8290
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND AND AIMS: Nickel (Ni)-hyperaccumulating species produce high-Ni litters and may potentially influence important ecosystem processes such as decomposition. Although litters resembling the natural community conditions are essential in order to predict decomposition dynamics, decomposition of mixed-species litters containing hyperaccumulated Ni has never been studied. This study aims to test the effect of different litter mixtures containing hyperaccumulated Ni on decomposition and Ni release across serpentine and non-serpentine soils. METHODS: Three different litter mixtures were prepared based on the relative abundance of the dominant species in three serpentine soils in the island of Lesbos, Greece where the Ni-hyperaccumulator Alyssum lesbiacum is present. Each litter mixture decomposed on its original serpentine habitat and on an adjacent non-serpentine habitat, in order to investigate whether the decomposition rates differ across the contrasted soils. In order to make comparisons across litter mixtures and to investigate whether additive or non-additive patterns of mass loss occur, a control non-serpentine site was used. Mass loss and Ni release were measured after 90, 180 and 270 d of field exposure. KEY RESULTS: The decomposition rates and Ni release had higher values on serpentine soils after all periods of field exposure. The recorded rapid release of hyperaccumulated Ni is positively related to the initial litter Ni concentration. No differences were found in the decomposition of the three different litter mixtures at the control non-serpentine site, while their patterns of mass loss were additive. CONCLUSIONS: Our results: (1) demonstrate the rapid decomposition of litters containing hyperaccumulated Ni on serpentine soils, indicating the presence of metal-tolerant decomposers; and (2) imply the selective decomposition of low-Ni parts of litters by the decomposers on non-serpentine soils. This study provides support for the elemental allelopathy hypothesis of hyperaccumulation, presenting the potential selective advantages acquired by metal-hyperaccumulating plants through litter decomposition on serpentine soils.
[Mh] Termos MeSH primário: Biodegradação Ambiental
Níquel/farmacocinética
Folhas de Planta/metabolismo
Solo
[Mh] Termos MeSH secundário: Crepis/metabolismo
Grécia
Hordeum/metabolismo
Níquel/análise
Plantago/metabolismo
Solo/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil); 7OV03QG267 (Nickel)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160420
[St] Status:MEDLINE
[do] DOI:10.1093/aob/mcw050


  4 / 49 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:26376761
[Au] Autor:Michalska K; Szneler E; Kisiel W
[Ad] Endereço:Department of Phytochemistry, Institute of Pharmacology, Polish Academy of Sciences, Kraków, Pl-31-343, Poland.
[Ti] Título:Structure elucidation of an unusual new sesquiterpene lactone glucoside ester from Crepis pannonica.
[So] Source:Magn Reson Chem;54(2):175-7, 2016 Feb.
[Is] ISSN:1097-458X
[Cp] País de publicação:England
[La] Idioma:eng
[Mh] Termos MeSH primário: Crepis/química
Glucosídeos/química
Lactonas/química
Sesquiterpenos/química
[Mh] Termos MeSH secundário: Ésteres
Glucosídeos/isolamento & purificação
Lactonas/isolamento & purificação
Sesquiterpenos/isolamento & purificação
[Pt] Tipo de publicação:LETTER; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Esters); 0 (Glucosides); 0 (Lactones); 0 (Sesquiterpenes); 0 (pannonicoside)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170127
[Lr] Data última revisão:
170127
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150918
[St] Status:MEDLINE
[do] DOI:10.1002/mrc.4358


  5 / 49 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
[PMID]:26975105
[Au] Autor:Li YY; Peng ZQ; He SL; Ni Y; Hao XL
[Ti] Título:[Chemical constituents from Crepis crocea].
[So] Source:Zhongguo Zhong Yao Za Zhi;40(19):3800-4, 2015 Oct.
[Is] ISSN:1001-5302
[Cp] País de publicação:China
[La] Idioma:chi
[Ab] Resumo:Thirteen compounds were isolated from the ethyl acetate fraction of Crepis crocea by column chromatographies on silica gel, Sephadex LH-20 and semi-preparative HPLC. The structures were elucidated on the basis of spectral analysis as tectorone I (1), 8ß- (2-methyl- 2-hydroxy-3-oxobutanoyloxy) -glucozaluzanin C (2), tectoroside (3), luteolin-7-O-glucoside (4), cosmosiin (5), esculetin (6), 3,4-dihydroxybenzaldehyde (7), trans-4-hydroxycinnamic acid (8), Caffeic acid (9), methyl p-hydroxyphenyllactate (10), ethylp- hydroxyphenyllactate (11), cis-3,4-dihydroxy-ß-ionion (12). All the compounds, except for compounds 4 and 9, were isolated from this plant for the first time, and tectorone I (1) is a new natural product.
[Mh] Termos MeSH primário: Crepis/química
Medicamentos de Ervas Chinesas/química
[Mh] Termos MeSH secundário: Medicamentos de Ervas Chinesas/isolamento & purificação
Espectrometria de Massas
Estrutura Molecular
[Pt] Tipo de publicação:ENGLISH ABSTRACT; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Drugs, Chinese Herbal)
[Em] Mês de entrada:1604
[Cu] Atualização por classe:160315
[Lr] Data última revisão:
160315
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160316
[St] Status:MEDLINE


  6 / 49 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:25683604
[Au] Autor:Enke N; Kunze R; Pustahija F; Glöckner G; Zimmermann J; Oberländer J; Kamari G; Siljak-Yakovlev S
[Ad] Endereço:Botanic Garden and Botanical Museum Berlin-Dahlem, Freie Universität Berlin, Berlin, Germany.
[Ti] Título:Genome size shifts: karyotype evolution in Crepis section Neglectoides (Asteraceae).
[So] Source:Plant Biol (Stuttg);17(4):775-86, 2015 Jul.
[Is] ISSN:1438-8677
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Plant genome size evolution is a very dynamic process: the ancestral genome of angiosperms was initially most likely small, which led to a tendency towards genome increase during evolution. However, findings in several angiosperm lineages demonstrate mechanisms that also led to genome size contraction. Recent molecular investigations on the Asteraceae genus Crepis suggest that several genomic reduction events have occurred during the evolution of the genus. This study focuses on the Mediterranean Crepis sect. Neglectoides, which includes three species with some of the smallest genomes within the whole genus. Crepis neglecta has the largest genome in sect. Neglectoides, approximately twice the size of the two species Crepis cretica and Crepis hellenica. Whereas C. cretica and C. hellencia are more closely related to each other than to C. neglecta the karyotypes of the latter species and C. cretica are similar, while that of C. hellenica differs considerably. Here, the karyotypic organisation of the three species is investigated with fluorescence in-situ hybridisation and studied in a molecular phylogenetic framework based on the nuclear markers Actin, CHR12, CPN60B, GPCR1 and XTH23. Our findings further corroborate the occurrence of genome size contraction in Crepis, and suggest that the difference in genome size between C. neglecta and C. cretica is mostly due to elimination of dispersed repetitive elements, whereas chromosomal reorganisation was involved in the karyotype formation of C. hellenica.
[Mh] Termos MeSH primário: Cromossomos de Plantas/genética
Crepis/genética
Evolução Molecular
Tamanho do Genoma
Genoma de Planta/genética
[Mh] Termos MeSH secundário: Sequência de Bases
Bandeamento Cromossômico
Crepis/citologia
DNA de Plantas/química
DNA de Plantas/genética
DNA Ribossômico/química
DNA Ribossômico/genética
Marcadores Genéticos/genética
Hibridização in Situ Fluorescente
Cariótipo
Dados de Sequência Molecular
Filogenia
Análise de Sequência de DNA
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (DNA, Plant); 0 (DNA, Ribosomal); 0 (Genetic Markers)
[Em] Mês de entrada:1601
[Cu] Atualização por classe:150624
[Lr] Data última revisão:
150624
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150217
[St] Status:MEDLINE
[do] DOI:10.1111/plb.12318


  7 / 49 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:24475276
[Au] Autor:Kwasniewska J; Mikolajczyk A
[Ad] Endereço:Department of Plant Anatomy and Cytology, University of Silesia, Katowice, Poland.
[Ti] Título:Influence of the presence of B chromosomes on DNA damage in Crepis capillaris.
[So] Source:PLoS One;9(1):e87337, 2014.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The sensitivity of different plant species to mutagenic agents is related to the DNA content and organization of the chromatin, which have been described in ABCW and bodyguard hypotheses, respectively. Plant species that have B chromosomes are good models for the study of these hypotheses. This study presents an analysis of the correlation between the occurrence of B chromosomes and the DNA damage that is induced by the chemical mutagen, maleic hydrazide (MH), in Crepis capillaris plants using comet assay. The presence of B chromosomes has a detectable impact on the level of DNA damage. The level of DNA damage after MH treatment was correlated with the number of B chromosomes and it was observed that it increased significantly in plants with 3B chromosomes. We did not find evidence of the protective role from chemical mutagens of the constitutive heterochromatin for euchromatin in relation to DNA damage. The DNA damage involving the 25S rDNA sequences was analyzed using the comet-FISH technique. Fragmentation within or near the 25S rDNA involved the loci on the A and B chromosomes. The presence of B chromosomes in C. capillaris cells had an influence on the level of DNA damage that involves the 25S rDNA region.
[Mh] Termos MeSH primário: Cromossomos de Plantas/genética
Crepis/genética
Dano ao DNA/efeitos dos fármacos
Dano ao DNA/genética
[Mh] Termos MeSH secundário: Ensaio Cometa
Hibridização in Situ Fluorescente
Hidrazida Maleica/toxicidade
RNA Ribossômico/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (RNA, Ribosomal); 130527-23-0 (RNA, ribosomal, 25S); TQ7L3FCV66 (Maleic Hydrazide)
[Em] Mês de entrada:1409
[Cu] Atualização por classe:150515
[Lr] Data última revisão:
150515
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140130
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0087337


  8 / 49 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:23912696
[Au] Autor:Andersson S; Ofori JK
[Ad] Endereço:Department of Biology, University of Lund, Sölvegatan 37, S-223 62 Lund, Sweden. stefan.andersson@biol.lu.se
[Ti] Título:Effects of mating system on adaptive potential for leaf morphology in Crepis tectorum (Asteraceae).
[So] Source:Ann Bot;112(5):947-55, 2013 Sep.
[Is] ISSN:1095-8290
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND AND AIMS: A shift from outcrossing to selfing is thought to reduce the long-term survival of populations by decreasing the genetic variation necessary for adaptation to novel ecological conditions. However, theory also predicts an increase in adaptive potential as more of the existing variation becomes expressed as homozygous genotypes. So far, relatively few studies have examined how a transition to selfing simultaneously affects means, variances and covariances for characters that might be under stabilizing selection for a spatially varying optimum, e.g. characters describing leaf morphology. METHODS: Experimental crosses within an initially self-sterile population of Crepis tectorum were performed to produce an outbred and inbred progeny population to assess how a shift to selfing affects the adaptive potential for measures of leaf morphology, with special emphasis on the degree of leaf dissection, a major target of diversifying selection within the study species. KEY RESULTS: Three consecutive generations of selfing had a minor impact on survival, the total number of heads produced and the mean leaf phenotype, but caused a proportional increase in the genetic (co)variance matrix for foliar characters. For the degree of leaf dissection, the lowest 50th percentile of the inbred progeny population showed a disproportionate increase in the genetic variance, consistent with the recessive nature of the weakly lobed phenotype observed in interpopulation crosses. Comparison of inbreeding response with large-scale patterns of variation indicates a potential for selection in a (recently) inbred population to drive a large evolutionary reduction in degree of leaf dissection by increasing the frequency of particular sibling lines. CONCLUSIONS: The results point to a positive role for inbreeding in phenotypic evolution, at least during or immediately after a rapid shift in mating system.
[Mh] Termos MeSH primário: Crepis/fisiologia
Variação Genética
Folhas de Planta/anatomia & histologia
[Mh] Termos MeSH secundário: Evolução Biológica
Crepis/anatomia & histologia
Crepis/genética
Cruzamentos Genéticos
Ecótipo
Flores/anatomia & histologia
Flores/genética
Flores/fisiologia
Endogamia
Fenótipo
Folhas de Planta/genética
Folhas de Planta/fisiologia
Reprodução
Seleção Genética
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1403
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:130806
[St] Status:MEDLINE
[do] DOI:10.1093/aob/mct158


  9 / 49 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
[PMID]:23667877
[Au] Autor:Koshpaeva ES; Semenov VV
[Ad] Endereço:Kazan State Medical University, Russia. kelens@mail.ru
[Ti] Título:Clastogenic and anticlastogenic activity of glucocorticoid hormones hydrocortisone and its synthetic analogs prednisolone and dexamethasone.
[So] Source:Bull Exp Biol Med;155(1):78-80, 2013 May.
[Is] ISSN:1573-8221
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Clastogenic and anticlastogenic activity of glucocorticoid hormones hydrocortisone, prednisolone, and dexamethasone was studied by counting chromosome aberrations in Crepis capillaris test system. Hydrocortisone in a concentration of 12.5 mg/ml produced a clastogenic effect and increased the number of chromosome aberrations in comparison with spontaneous level. Hydrocortisone (6.25 and 3.13 mg/ml), prednisolone (15, 7.5, and 3.75 mg/ml), and dexamethasone (1, 0.5, 0.25, and 0.125 mg/ml) exhibited an anticlastogenic effect and reduced ethyl methanesulfonate-induced mutagenesis.
[Mh] Termos MeSH primário: Antimutagênicos/farmacologia
Aberrações Cromossômicas/efeitos dos fármacos
Dexametasona/farmacologia
Hidrocortisona/farmacologia
Mutagênese/efeitos dos fármacos
Mutagênicos/toxicidade
Prednisolona/farmacologia
[Mh] Termos MeSH secundário: Células Cultivadas
Crepis/efeitos dos fármacos
Dexametasona/toxicidade
Metanossulfonato de Etila/toxicidade
Hidrocortisona/toxicidade
Prednisolona/toxicidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antimutagenic Agents); 0 (Mutagens); 7S5I7G3JQL (Dexamethasone); 9H154DI0UP (Ethyl Methanesulfonate); 9PHQ9Y1OLM (Prednisolone); WI4X0X7BPJ (Hydrocortisone)
[Em] Mês de entrada:1402
[Cu] Atualização por classe:130513
[Lr] Data última revisão:
130513
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:130514
[St] Status:MEDLINE


  10 / 49 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:23443058
[Au] Autor:Dornier A; Cheptou PO
[Ad] Endereço:UMR 5175 CEFE-CNRS-Centre d'Ecologie Fonctionnelle et Evolutive CNRS, Montpellier, France.
[Ti] Título:Inferring contemporary dispersal processes in plant metapopulations: comparison of direct and indirect estimates of dispersal for the annual species Crepis sancta.
[So] Source:Heredity (Edinb);111(1):1-7, 2013 Jul.
[Is] ISSN:1365-2540
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Analyzing population dynamics in changing habitats is a prerequisite for population dynamics forecasting. The recent development of metapopulation modeling allows the estimation of dispersal kernels based on the colonization pattern but the accuracy of these estimates compared with direct estimates of the seed dispersal kernel has rarely been assessed. In this study, we used recent genetic methods based on parentage analysis (spatially explicit mating models) to estimate seed and pollen dispersal kernels as well as seed and pollen immigration in fragmented urban populations of the plant species Crepis sancta with contrasting patch dynamics. Using two independent networks, we documented substantial seed immigration and a highly restricted dispersal kernel. Moreover, immigration heterogeneity among networks was consistent with previously reported metapopulation dynamics, showing that colonization was mainly due to external colonization in the first network (propagule rain) and local colonization in the second network. We concluded that the differences in urban patch dynamics are mainly due to seed immigration heterogeneity, highlighting the importance of external population source in the spatio-temporal dynamics of plants in a fragmented landscape. The results show that indirect and direct methods were qualitatively consistent, providing a proper interpretation of indirect estimates. This study provides attempts to link genetic and demographic methods and show that patch occupancy models may provide simple methods for analyzing population dynamics in heterogeneous landscapes in the context of global change.
[Mh] Termos MeSH primário: Crepis/fisiologia
Interpretação Estatística de Dados
Técnicas Genéticas
Dispersão de Sementes
[Mh] Termos MeSH secundário: Crepis/genética
Demografia
Ecossistema
Modelos Biológicos
Dinâmica Populacional
Sementes/genética
Sementes/crescimento & desenvolvimento
Sementes/fisiologia
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[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:130228
[St] Status:MEDLINE
[do] DOI:10.1038/hdy.2013.3



página 1 de 5 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