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Pesquisa : B01.650.940.800.575.156.100.666 [Categoria DeCS]
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[PMID]:29225126
[Au] Autor:Xu J; Xu J; Ai Y; Farid RA; Tong L; Yang D
[Ad] Endereço:Gene Engineering and Biotechnology Beijing Key Laboratory, College of Life Sciences, Beijing Normal University, Beijing 100875 China.
[Ti] Título:Mutational analysis and dynamic simulation of S-limonene synthase reveal the importance of Y573: Insight into the cyclization mechanism in monoterpene synthases.
[So] Source:Arch Biochem Biophys;638:27-34, 2018 01 15.
[Is] ISSN:1096-0384
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Monoterpene synthases carry out complex reactions to produce multiple products from a sole substrate, geranyl pyrophosphate (GPP). S-limonene synthase (LS) is a model monoterpene synthase that can be explored to understand the catalytic mechanism of these enzymes. In this study, we have identified an active site tyrosine residue (Y573) is crucial for the enzyme activity and mutational analysis indicates that both the aromatic ring and hydroxyl group are essential for the catalysis. Dynamic simulations found a hydrogen bond between Y573 and D496 and also a significant conformational change in the helical form of the LPP intermediate. Further mutagenesis suggested that this hydrogen bond is essential for catalysis. Sequence analysis suggested Y573 is completely conserved among cyclic monoterpene synthases but variable in acyclic enzymes, indicating this residue may be involved in cyclization. Subsequent studies by using neryl diphosphate (NPP) as the substrate ruled out the possibility that Y573 functions solely at the substrate isomerization step. Therefore, a more complicated role may be played by this residue. We proposed that Y573 may be involved in the earlier steps of the reaction, probably by controlling the conformation of the helical LPP intermediate. Our study provides important insights not only on the catalytic mechanism of LS, but also on the cyclization of monoterpene synthases in general.
[Mh] Termos MeSH primário: Liases Intramoleculares
Simulação de Dinâmica Molecular
Mutação de Sentido Incorreto
Pinaceae
Proteínas de Plantas
[Mh] Termos MeSH secundário: Substituição de Aminoácidos
Liases Intramoleculares/química
Liases Intramoleculares/genética
Mutagênese
Pinaceae/enzimologia
Pinaceae/genética
Proteínas de Plantas/química
Proteínas de Plantas/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Plant Proteins); EC 5.5.- (Intramolecular Lyases); EC 5.5.- (pinene cyclase I)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180214
[Lr] Data última revisão:
180214
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171212
[St] Status:MEDLINE


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[PMID]:28686672
[Au] Autor:Bai Y; Li X
[Ad] Endereço:Key Laboratory of Vertebrate Evolution and Human Origin of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, China.
[Ti] Título:Late Miocene Pseudolarix amabilis bract-scale complex from Zhejiang, East China.
[So] Source:PLoS One;12(7):e0180979, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Previously, the identification of fossil Pseudolarix at the species level has been based on the morphology of the bract-scale complex of the seed cone. The morphological consistence of fossils through most of the Cenozoic with extant P. amabilis has led them to be considered conspecific, suggesting that P. amabilis is an extraordinary example of morphological stasis. However, the lack of cuticular evidence, especially for the leaf-homologous bract, reduces the accuracy of fossil identification based on morphology, thus weakening the evidence for morphological stasis in P. amabilis. For the first time, we provide cuticular evidence of the bract-scale of fossil P. amabilis based on the bract-scale complex from the late Miocene Shengxian Formation, Zhejiang, East China, which improves the identification accuracy and reinforces the concept of morphological stasis in this species. Second, we preliminarily reveal the niche stability of P. amabilis, which corresponds to its morphological stasis. Finally, we infer that the late Miocene forest containing P. amabilis in Zhejiang was an evergreen sclerophyllous broad-leaved or mixed mesophytic forest, which combined with the evergreen broad-leaved forest suggested by previous megafossil studies, indicates the occurrence of vertical vegetation zonation.
[Mh] Termos MeSH primário: Fósseis/ultraestrutura
Pinaceae/anatomia & histologia
Folhas de Planta/anatomia & histologia
Sementes/anatomia & histologia
[Mh] Termos MeSH secundário: Evolução Biológica
China
Florestas
Fósseis/história
História Antiga
Filogenia
Filogeografia
Pinaceae/classificação
Pinaceae/fisiologia
Folhas de Planta/fisiologia
Sementes/fisiologia
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170922
[Lr] Data última revisão:
170922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170708
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0180979


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[PMID]:27604576
[Au] Autor:Klimiene A; Vainoriene R; Klimas R
[Ad] Endereço:Siauliai University, Vilniaus str. 88, LT-76285, Siauliai, Lithuania. astakl3g@gmail.com.
[Ti] Título:Phenological research of climate changes in the north part of Lithuania by the phenological garden of Siauliai University.
[So] Source:Int J Biometeorol;61(2):293-301, 2017 Feb.
[Is] ISSN:1432-1254
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Siauliai University Botanical Garden is a member of the International Phenological Garden network since 2005. It is the only one botanical garden in the East Europe that participated in the programme. In 2015, 18 species were observed. For research, data of 14 plants was used. The aim of this study is to estimate the responsiveness of the species of plants of the phenological garden to annual and monthly precipitation and temperature of the air. The main variables in this investigation were growing season length and the beginning of the growing season. In the period 2006-2015, the lowest annual air temperature was in 2010 (6.0 °C), and the highest was in 2015 (8.9 °C). The lowest precipitation was in 2015 (37.3 mm), and the highest was in 2012 (63.5 mm). The leanest regression among growing length, average annual precipitation, and air temperature showed that statistically significant correlation between growing length and average annual air temperature was found for nine plants, between growing length and precipitation was found for three plants, and between growing length and both factors was found for one plant, Salix smithiana, only. Due to the short evaluating period (2007-2015), consistent regression of the length of the growing season could not be found. The growing length of Betula pubescens sequentially increased. The average growing season of 14 plants starts on April 27 (±3), but for Corylus avellana, it is on April 26 (±3). Longevity of the growing season was the most related with precipitation for C. avellana in summer, autumn, and winter and with air temperature, Ribes alpinum and Salix acutifolia in summer and in autumn.
[Mh] Termos MeSH primário: Mudança Climática
Magnoliopsida/crescimento & desenvolvimento
Pinaceae/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Jardins
Lituânia
Chuvas
Estações do Ano
Temperatura Ambiente
Universidades
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160909
[St] Status:MEDLINE
[do] DOI:10.1007/s00484-016-1211-2


  4 / 196 MEDLINE  
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[PMID]:27580458
[Au] Autor:Wu J; Li H; Huang G; Chen Y
[Ad] Endereço:a School of Chemistry and Chemical Engineering , Yunnan Normal University , Kunming , China.
[Ti] Título:A new cyclopeptide and a new lignan from Podocarpus neriifolius.
[So] Source:Nat Prod Res;31(2):239-244, 2017 Jan.
[Is] ISSN:1478-6427
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A new cyclopeptide, neriitide A (1) and a new lignan, neriilignan (2), along with six known compounds including two diterpenoids, three sesquiterpenoids and one sterol were isolated from the leaves of Podocarpus neriifolius. Their structures were elucidated by means of extensive spectroscopic analysis including HREIMS, 1D and 2D NMR techniques. This is the first report of cyclopeptide and lignan separated from this plant.
[Mh] Termos MeSH primário: Lignanas/química
Peptídeos Cíclicos/química
Pinaceae/química
[Mh] Termos MeSH secundário: Diterpenos/química
Diterpenos/isolamento & purificação
Lignanas/isolamento & purificação
Estrutura Molecular
Peptídeos Cíclicos/isolamento & purificação
Folhas de Planta/química
Sesquiterpenos/química
Sesquiterpenos/isolamento & purificação
Análise Espectral
Esteróis/química
Esteróis/isolamento & purificação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Diterpenes); 0 (Lignans); 0 (Peptides, Cyclic); 0 (Sesquiterpenes); 0 (Sterols)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160901
[St] Status:MEDLINE


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[PMID]:27896555
[Au] Autor:Lundborg L; Nordlander G; Björklund N; Nordenhem H; Borg-Karlson AK
[Ad] Endereço:Department of Chemistry, Organic Chemistry, KTH Royal Institute of Technology, School of Chemical Science and Engineering, SE-100 44, Stockholm, Sweden. linalun@kth.se.
[Ti] Título:Methyl Jasmonate-Induced Monoterpenes in Scots Pine and Norway Spruce Tissues Affect Pine Weevil Orientation.
[So] Source:J Chem Ecol;42(12):1237-1246, 2016 Dec.
[Is] ISSN:1573-1561
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In large parts of Europe, insecticide-free measures for protecting conifer plants are desired to suppress damage by the pine weevil Hylobius abietis (L.). Treatment with methyl jasmonate (MeJA), a chemical elicitor already used in crop production, may enhance expression of chemical defenses in seedlings in conifer regenerations. However, in a previous experiment, MeJA treatment resulted in substantially better field protection for Scots pine (Pinus sylvestris L.) than for Norway spruce (Picea abies (L.) Karst.). Hypothesizing that the variations may be at least due partly to volatiles released by MeJA-treated seedlings and their effects on pine weevil orientation, we examined tissue extracts of seedlings (from the same batches as previously used) by two-dimensional GC-MS. We found that the MeJA treatment increased contents of the monoterpene (-)-ß-pinene in phloem (the weevil's main target tissue) of both tree species, however, the (-)-ß-pinene/(-)-α-pinene ratio increased more in the phloem of P. sylvestris. We also tested the attractiveness of individual monoterpenes found in conifer tissues (needles and phloem) for pine weevils using an arena with traps baited with single-substance dispensers and pine twigs. Trap catches were reduced when the pine material was combined with a dispenser releasing (-)-ß-pinene, (+)-3-carene, (-)-bornyl acetate or 1,8-cineole. However, (-)-α-pinene did not have this effect. Thus, the greater field protection of MeJA-treated P. sylvestris seedlings may be due to the selective induction of increases in contents of the deterrent (-)-ß-pinene, in contrast to strong increases in both non-deterrent (-)-α-pinene and the deterrent (-)-ß-pinene in P. abies seedlings.
[Mh] Termos MeSH primário: Acetatos/metabolismo
Ciclopentanos/metabolismo
Controle de Insetos
Monoterpenos/metabolismo
Oxilipinas/metabolismo
Pinaceae/fisiologia
Pinaceae/parasitologia
Gorgulhos/fisiologia
[Mh] Termos MeSH secundário: Animais
Controle de Insetos/métodos
Monoterpenos/análise
Noruega
Picea/química
Picea/parasitologia
Picea/fisiologia
Pinaceae/química
Pinus sylvestris/química
Pinus sylvestris/parasitologia
Pinus sylvestris/fisiologia
Plântulas/química
Plântulas/parasitologia
Plântulas/fisiologia
Compostos Orgânicos Voláteis/análise
Compostos Orgânicos Voláteis/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acetates); 0 (Cyclopentanes); 0 (Monoterpenes); 0 (Oxylipins); 0 (Volatile Organic Compounds); 900N171A0F (methyl jasmonate)
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161130
[St] Status:MEDLINE


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[PMID]:27706692
[Au] Autor:Fan YJ; Grebenc T; Wei J; Zhao YL; Yan W; Wang LB
[Ti] Título:Association of ectomycorrhizal fungi with Picea crassifolia (Pinaceae, Piceoidae) from high-altitude stands in Mount Helan Nature Reserve, China.
[So] Source:Genet Mol Res;15(3), 2016 Sep 02.
[Is] ISSN:1676-5680
[Cp] País de publicação:Brazil
[La] Idioma:eng
[Ab] Resumo:We investigated the diversity of ectomycorrhiza associated with the endemic Picea crassifolia in Mount Helan National Nature Reserve in Inner Mongolia, China. Toward this objective, we conducted morphological and molecular identification of ectomycorrhizae in soil cubes taken from pure P. crassifolia stands. Eleven types of ectomycorrhizal (ECM) organisms were separated, briefly described, and identified. Nine morphotypes belonged to the phylum Basidiomycotina [Amphinema byssoides, Cortinarius sp (cf. limonius), Cortinarius vernus, Inocybe cf. nitidiscula, Inocybe sp 1, Sebacina incrustans, Sebacina sp, Suillus luteus, and Piceirhiza tuberculata x Picea crassifolia (comb. Nov.)], and two morphotypes to the phylum Ascomycotina (Cenococcum geophilum and Helvella sp). The diversity of ECM organisms in P. crassifolia was lower than that reported by other studies on spruce or pine forests, or on sporocarp diversity in the high-mountain forests of China. Most of the fungi in the rhizosphere did not correspond to species previously recorded as sporocarps above ground. Here, several new ectomycorrhiza morphotypes are proposed and described. We also confirmed the ectomycorrhizal status of the genus Sebacina (order Sebacinales).
[Mh] Termos MeSH primário: DNA Fúngico/genética
Micorrizas/genética
Filogenia
Pinaceae/microbiologia
Microbiologia do Solo
[Mh] Termos MeSH secundário: Altitude
Biodiversidade
China
Conservação dos Recursos Naturais
DNA Espaçador Ribossômico
Ecossistema
Florestas
Micorrizas/classificação
Simbiose/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Fungal); 0 (DNA, Ribosomal Spacer)
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170224
[Lr] Data última revisão:
170224
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161006
[St] Status:MEDLINE
[do] DOI:10.4238/gmr.15038604


  7 / 196 MEDLINE  
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[PMID]:27560965
[Au] Autor:Hao Z; Cheng T; Zheng R; Xu H; Zhou Y; Li M; Lu F; Dong Y; Liu X; Chen J; Shi J
[Ad] Endereço:Key Laboratory of Forest Genetics and Biotechnology, Ministry of Education, Nanjing Forestry University, Nanjing, China.
[Ti] Título:The Complete Chloroplast Genome Sequence of a Relict Conifer Glyptostrobus pensilis: Comparative Analysis and Insights into Dynamics of Chloroplast Genome Rearrangement in Cupressophytes and Pinaceae.
[So] Source:PLoS One;11(8):e0161809, 2016.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Glyptostrobus pensilis, belonging to the monotypic genus Glyptostrobus (Family: Cupressaceae), is an ancient conifer that is naturally distributed in low-lying wet areas. Here, we report the complete chloroplast (cp) genome sequence (132,239 bp) of G. pensilis. The G. pensilis cp genome is similar in gene content, organization and genome structure to the sequenced cp genomes from other cupressophytes, especially with respect to the loss of the inverted repeat region A (IRA). Through phylogenetic analysis, we demonstrated that the genus Glyptostrobus is closely related to the genus Cryptomeria, supporting previous findings based on physiological characteristics. Since IRs play an important role in stabilize cp genome and conifer cp genomes lost different IR regions after splitting in two clades (cupressophytes and Pinaceae), we performed cp genome rearrangement analysis and found more extensive cp genome rearrangements among the species of cupressophytes relative to Pinaceae. Additional repeat analysis indicated that cupressophytes cp genomes contained less potential functional repeats, especially in Cupressaceae, compared with Pinaceae. These results suggested that dynamics of cp genome rearrangement in conifers differed since the two clades, Pinaceae and cupressophytes, lost IR copies independently and developed different repeats to complement the residual IRs. In addition, we identified 170 perfect simple sequence repeats that will be useful in future research focusing on the evolution of genetic diversity and conservation of genetic variation for this endangered species in the wild.
[Mh] Termos MeSH primário: Coniferophyta/genética
Cupressaceae/genética
Genes de Cloroplastos/genética
Genoma de Cloroplastos/genética
Pinaceae/genética
[Mh] Termos MeSH secundário: Coniferophyta/classificação
DNA de Plantas/química
DNA de Plantas/genética
Evolução Molecular
Rearranjo Gênico
Variação Genética
Genoma de Planta/genética
Sequências Repetidas Invertidas/genética
Filogenia
Pinaceae/classificação
Sequências Repetitivas de Ácido Nucleico/genética
Análise de Sequência de DNA
Especificidade da Espécie
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Plant)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170804
[Lr] Data última revisão:
170804
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160826
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0161809


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[PMID]:27352945
[Au] Autor:Sudianto E; Wu CS; Lin CP; Chaw SM
[Ad] Endereço:Biodiversity Program, Taiwan International Graduate Program, Biodiversity Research Center, Academia Sinica and National Taiwan Normal University, Nankang District, Taipei 11529, Taiwan Department of Life Science, National Taiwan Normal University, Wenshan District, Taipei 11677, Taiwan Biodiversity
[Ti] Título:Revisiting the Plastid Phylogenomics of Pinaceae with Two Complete Plastomes of Pseudolarix and Tsuga.
[So] Source:Genome Biol Evol;8(6):1804-11, 2016 06 27.
[Is] ISSN:1759-6653
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Phylogeny of the ten Pinaceous genera has long been contentious. Plastid genomes (plastomes) provide an opportunity to resolve this problem because they contain rich evolutionary information. To comprehend the plastid phylogenomics of all ten Pinaceous genera, we sequenced the plastomes of two previously unavailable genera, Pseudolarix amabilis (122,234 bp) and Tsuga chinensis (120,859 bp). Both plastomes share similar gene repertoire and order. Here for the first time we report a unique insertion of tandem repeats in accD of T. chinensis From the 65 plastid protein-coding genes common to all Pinaceous genera, we re-examined the phylogenetic relationship among all Pinaceous genera. Our two phylogenetic trees are congruent in an identical tree topology, with the five genera of the Abietoideae subfamily constituting a monophyletic clade separate from the other three subfamilies: Pinoideae, Piceoideae, and Laricoideae. The five genera of Abietoideae were grouped into two sister clades consisting of (1) Cedrus alone and (2) two sister subclades of Pseudolarix-Tsuga and Abies-Keteleeria, with the former uniquely losing the gene psaM and the latter specifically excluding the 3 psbA from the residual inverted repeat.
[Mh] Termos MeSH primário: Genomas de Plastídeos/genética
Filogenia
Pinaceae/genética
Tsuga/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Sequenciamento de Nucleotídeos em Larga Escala
Sequências Repetidas Invertidas/genética
Anotação de Sequência Molecular
Plastídeos/genética
[Pt] Tipo de publicação:LETTER
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170306
[Lr] Data última revisão:
170306
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160630
[St] Status:MEDLINE
[do] DOI:10.1093/gbe/evw106


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[PMID]:27316353
[Au] Autor:Laforest-Lapointe I; Messier C; Kembel SW
[Ad] Endereço:Département des sciences biologiques, Université du Québec à Montréal, C.P. 8888, Succ. Centre-Ville, Montréal, H3C 3P8, Québec, Canada. isabelle.laforest.lapointe@gmail.com.
[Ti] Título:Host species identity, site and time drive temperate tree phyllosphere bacterial community structure.
[So] Source:Microbiome;4(1):27, 2016 06 18.
[Is] ISSN:2049-2618
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The increasing awareness of the role of phyllosphere microbial communities in plant health calls for a greater understanding of their structure and dynamics in natural ecosystems. Since most knowledge of tree phyllosphere bacterial communities has been gathered in tropical forests, our goal was to characterize the community structure and assembly dynamics of phyllosphere epiphytic bacterial communities in temperate forests in Quebec, Canada. We targeted five dominant tree species: Acer saccharum, Acer rubrum, Betula papyrifera, Abies balsamea, and Picea glauca. We collected 180 samples of phyllosphere communities on these species at four natural forest sites, three times during the growing season. RESULTS: Host functional traits (i.e., wood density, leaf nitrogen content) and climate variables (summer mean temperature and precipitation) were strongly correlated with community structure. We highlight three key findings: (1) temperate tree species share a "core microbiome"; (2) significant evolutionary associations exist between groups of bacteria and host species; and (3) a greater part of the variation in phyllosphere bacterial community assembly is explained by host species identity (27 %) and species-site interaction (14 %), than by site (11 %) or time (1 %). CONCLUSIONS: We demonstrated that host species identity is a stronger driver of temperate tree phyllosphere bacterial communities than site or time. Our results suggest avenues for future studies on the influence of host functional traits on phyllosphere community functional biogeography across terrestrial biomes.
[Mh] Termos MeSH primário: Acer/microbiologia
Bactérias/classificação
Betula/microbiologia
Pinaceae/microbiologia
[Mh] Termos MeSH secundário: Abies/microbiologia
Biodiversidade
Especificidade de Hospedeiro
Filogenia
Picea/microbiologia
Quebeque
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1705
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160619
[St] Status:MEDLINE
[do] DOI:10.1186/s40168-016-0174-1


  10 / 196 MEDLINE  
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[PMID]:27257971
[Au] Autor:Zhou F; Fang K; Zhang F; Dong Z; Chen D
[Ad] Endereço:Key Laboratory of Humid Subtropical Eco-geographical Process (MOE), Fujian Normal University, Fuzhou 350007, China.
[Ti] Título:Climate-Driven Synchronized Growth of Alpine Trees in the Southeast Tibetan Plateau.
[So] Source:PLoS One;11(6):e0156126, 2016.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Knowledge about the spatiotemporal tree growth variability and its associations with climate provides key insights into forest dynamics under future scenarios of climate change. We synthesized 17 tree-ring width chronologies from four tree species at the high-elevation sites in the southeast Tibetan Plateau (SETP) to study the regional tree growth variability and climate-growth relationships. Despite of diverse habitats and different physiological characteristics of these species, these tree-ring chronologies shared a significant common variance in SETP. An unprecedented increase in the shared variance is found along the latter half of the 20th century, coinciding with the enhancement of the frequency of extreme rings among chronologies. It is found that minimum winter temperature tends to be the dominant climate for trees in this region. The site-specific responses in cold (1965-1980) and warm (1990-2005) intervals by means of Fuzzy Cmeans (FCM) clustering reveal that the remarkable enhancement of growth synchrony among trees mainly occur in warm conditions. This is different from previous findings indicating that increased consistence among temperature sensitive tree rings in cold periods. This may be related to the reduced temperature sensitivity of regional tree growth as winter minimum temperature is lower than a certain threshold, which is in agreement with the "principle of ecological amplitude". In addition, it is worth noting that precipitation in June have started to restrain the tree growth since the beginning of the 1980s, which is possibly an important contributor for synchronized growth among trees in SETP.
[Mh] Termos MeSH primário: Clima
Ecossistema
Florestas
Juniperus/crescimento & desenvolvimento
Pinaceae/crescimento & desenvolvimento
Temperatura Ambiente
[Mh] Termos MeSH secundário: Mudança Climática
Ecologia
Tibet
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170724
[Lr] Data última revisão:
170724
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160604
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0156126



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