Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.912.250.583.700.067 [Categoria DeCS]
Referências encontradas : 172 [refinar]
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  1 / 172 MEDLINE  
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[PMID]:28902886
[Au] Autor:Fresquet-Corrales S; Roque E; Sarrión-Perdigones A; Rochina M; López-Gresa MP; Díaz-Mula HM; Bellés JM; Tomás-Barberán F; Beltrán JP; Cañas LA
[Ad] Endereço:Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), Valencia, Spain.
[Ti] Título:Metabolic engineering to simultaneously activate anthocyanin and proanthocyanidin biosynthetic pathways in Nicotiana spp.
[So] Source:PLoS One;12(9):e0184839, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Proanthocyanidins (PAs), or condensed tannins, are powerful antioxidants that remove harmful free oxygen radicals from cells. To engineer the anthocyanin and proanthocyanidin biosynthetic pathways to de novo produce PAs in two Nicotiana species, we incorporated four transgenes to the plant chassis. We opted to perform a simultaneous transformation of the genes linked in a multigenic construct rather than classical breeding or retransformation approaches. We generated a GoldenBraid 2.0 multigenic construct containing two Antirrhinum majus transcription factors (AmRosea1 and AmDelila) to upregulate the anthocyanin pathway in combination with two Medicago truncatula genes (MtLAR and MtANR) to produce the enzymes that will derivate the biosynthetic pathway to PAs production. Transient and stable transformation of Nicotiana benthamiana and Nicotiana tabacum with the multigenic construct were respectively performed. Transient expression experiments in N. benthamiana showed the activation of the anthocyanin pathway producing a purple color in the agroinfiltrated leaves and also the effective production of 208.5 nmol (-) catechin/g FW and 228.5 nmol (-) epicatechin/g FW measured by the p-dimethylaminocinnamaldehyde (DMACA) method. The integration capacity of the four transgenes, their respective expression levels and their heritability in the second generation were analyzed in stably transformed N. tabacum plants. DMACA and phoroglucinolysis/HPLC-MS analyses corroborated the activation of both pathways and the effective production of PAs in T0 and T1 transgenic tobacco plants up to a maximum of 3.48 mg/g DW. The possible biotechnological applications of the GB2.0 multigenic approach in forage legumes to produce "bloat-safe" plants and to improve the efficiency of conversion of plant protein into animal protein (ruminal protein bypass) are discussed.
[Mh] Termos MeSH primário: Antocianinas/biossíntese
Engenharia Metabólica/métodos
Proantocianidinas/biossíntese
Tabaco/metabolismo
[Mh] Termos MeSH secundário: Antocianinas/genética
Antirrhinum/genética
Vias Biossintéticas/genética
Radicais Livres/metabolismo
Plantas Geneticamente Modificadas/metabolismo
Proantocianidinas/genética
Tabaco/genética
Fatores de Transcrição/genética
Regulação para Cima
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anthocyanins); 0 (Free Radicals); 0 (Proanthocyanidins); 0 (Transcription Factors)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171024
[Lr] Data última revisão:
171024
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170914
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0184839


  2 / 172 MEDLINE  
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[PMID]:28701463
[Au] Autor:Kries H; Kellner F; Kamileen MO; O'Connor SE
[Ad] Endereço:From the Department of Biological Chemistry, The John Innes Centre, Norwich NR4 7UH, United Kingdom and.
[Ti] Título:Inverted stereocontrol of iridoid synthase in snapdragon.
[So] Source:J Biol Chem;292(35):14659-14667, 2017 Sep 01.
[Is] ISSN:1083-351X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The natural product class of iridoids, found in various species of flowering plants, harbors astonishing chemical complexity. The discovery of iridoid biosynthetic genes in the medicinal plant has provided insight into the biosynthetic origins of this class of natural product. However, not all iridoids share the exact five- to six-bicyclic ring scaffold of the iridoids. For instance, iridoids in the ornamental flower snapdragon ( , Plantaginaceae family) are derived from the C7 epimer of this scaffold. Here we have cloned and characterized the iridoid synthase enzyme from (AmISY), the enzyme that is responsible for converting 8-oxogeranial into the bicyclic iridoid scaffold in a two-step reduction-cyclization sequence. Chiral analysis of the reaction products reveals that AmISY reduces C7 to generate the opposite stereoconfiguration in comparison with the homologue CrISY. The catalytic activity of AmISY thus explains the biosynthesis of 7-epi-iridoids in and related genera. However, although the stereoselectivity of the reduction step catalyzed by AmISY is clear, in both AmISY and CrISY, the cyclization step produces a diastereomeric mixture. Although the reduction of 8-oxogeranial is clearly enzymatically catalyzed, the cyclization step appears to be subject to less stringent enzyme control.
[Mh] Termos MeSH primário: Alquil e Aril Transferases/metabolismo
Antirrhinum/enzimologia
Iridoides/metabolismo
Modelos Moleculares
Proteínas de Plantas/metabolismo
[Mh] Termos MeSH secundário: Alquil e Aril Transferases/química
Alquil e Aril Transferases/genética
Substituição de Aminoácidos
Biocatálise
Domínio Catalítico
Catharanthus/enzimologia
Iridoides/química
Estrutura Molecular
Monoterpenos/química
Monoterpenos/metabolismo
Mutação
NADP/química
NADP/metabolismo
Oxirredução
Filogenia
Proteínas de Plantas/química
Proteínas de Plantas/genética
Conformação Proteica
Proteínas Recombinantes de Fusão/química
Proteínas Recombinantes de Fusão/metabolismo
Proteínas Recombinantes/química
Proteínas Recombinantes/metabolismo
Estereoisomerismo
Homologia Estrutural de Proteína
Especificidade por Substrato
Terpenos/química
Terpenos/metabolismo
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Iridoids); 0 (Monoterpenes); 0 (Plant Proteins); 0 (Recombinant Fusion Proteins); 0 (Recombinant Proteins); 0 (Terpenes); 53-59-8 (NADP); EC 2.5.- (Alkyl and Aryl Transferases); EC 2.5.1.- (terpene synthase); PL902IKN0A (decaprenoic acid); T7EU0O9VPP (citral)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170926
[Lr] Data última revisão:
170926
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170714
[St] Status:MEDLINE
[do] DOI:10.1074/jbc.M117.800979


  3 / 172 MEDLINE  
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[PMID]:28570685
[Au] Autor:Wang D; Cao G; Fang P; Xia L; Cheng B
[Ad] Endereço:School of Horticulture, Anhui Agricultural University, Hefei, China.
[Ti] Título:Comparative transcription analysis of different Antirrhinum phyllotaxy nodes identifies major signal networks involved in vegetative-reproductive transition.
[So] Source:PLoS One;12(6):e0178424, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Vegetative-reproductive phase change is an indispensable event which guarantees several aspects of successful meristem behaviour and organ development. Antirrhinum majus undergoes drastic changes of shoot architecture during the phase change, including phyllotactic change and leaf type alteration from opposite decussate to spiral. However, the regulation mechanism in both of phyllotactic morphology changes is still unclear. Here, the Solexa/Illumina RNA-seq high-throughput sequencing was used to evaluate the global changes of transcriptome levels among four node regions during phyllotactic development. More than 86,315,782 high quality reads were sequenced and assembled into 58,509 unigenes. These differentially expressed genes (DEGs) were classified into 118 pathways described in the KEGG database. Based on the heat-map analysis, a large number of DEGs were overwhelmingly distributed in the hormone signal pathway as well as the carbohydrate biosynthesis and metabolism. The quantitative real time (qRT)-PCR results indicated that most of DEGs were highly up-regulated in the swapping regions of phyllotactic morphology. Moreover, transcriptions factors (TFs) with high transcripts were also identified, controlling the phyllotactic morphology by the regulation of hormone and sugar-metabolism signal pathways. A number of DEGs did not align with any databases and might be novel genes involved in the phyllotactic development. These genes will serve as an invaluable genetic resource for understanding the molecular mechanism of the phyllotactic development.
[Mh] Termos MeSH primário: Antirrhinum/classificação
Transdução de Sinais
Transcrição Genética
[Mh] Termos MeSH secundário: Antirrhinum/genética
Antirrhinum/crescimento & desenvolvimento
Antirrhinum/fisiologia
Genes de Plantas
Reguladores de Crescimento de Planta/metabolismo
Reação em Cadeia da Polimerase em Tempo Real
Reprodução
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Plant Growth Regulators)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170926
[Lr] Data última revisão:
170926
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170602
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0178424


  4 / 172 MEDLINE  
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[PMID]:28278685
[Au] Autor:Tomassini L; Serafini M; Ventrone A; Nicoletti M; Cometa MF; Ragusa S
[Ad] Endereço:a Department of Environmental Biology , University "Sapienza" , Roma , Italy.
[Ti] Título:A new iridoid diglucoside from Antirrhinum siculum.
[So] Source:Nat Prod Res;31(14):1594-1597, 2017 Jul.
[Is] ISSN:1478-6427
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A new iridoid diglucoside has been isolated from an ethanolic extract of Antirrhinum siculum, together with five-known compounds. Its structure has been assigned as 5-O-glucopyranosyl-7α-hydroxyharpagide by spectroscopic means.
[Mh] Termos MeSH primário: Antirrhinum/química
Iridoides/isolamento & purificação
[Mh] Termos MeSH secundário: Iridoides/química
Estrutura Molecular
Análise Espectral
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Iridoids)
[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:170311
[St] Status:MEDLINE
[do] DOI:10.1080/14786419.2017.1286482


  5 / 172 MEDLINE  
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[PMID]:28008001
[Au] Autor:Zhou H; Hirata M; Osawa R; Fujino K; Kishima Y
[Ad] Endereço:Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.
[Ti] Título:Detainment of Tam3 Transposase at Plasma Membrane by Its BED-Zinc Finger Domain.
[So] Source:Plant Physiol;173(2):1492-1501, 2017 Feb.
[Is] ISSN:1532-2548
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Transposable elements (TEs) are considered to be parasites of host genomes because they act as powerful mutagens. If not kept in check, they can cause gene disruption, genome rearrangement, and genomic takeover. Hence, activities of TEs are under the rigid control of hosts. To date, all identified TE regulations have been epigenetic dependent, with the exception of the DNA transposon Tam3. Blocking nuclear translocation of Tam3 transposase (TPase) is consistent with the suppression of Tam3 in Antirrhinum majus In this article, we discovered that epigenetic-independent regulation of Tam3 is mediated by the BED-zinc finger (Znf-BED) domain of Tam3 TPase. The host targets the N terminus of the Znf-BED domain, which contains two highly conserved aromatic amino acids, to detain Tam3 TPase at the plasma membrane and to silence Tam3. Zinc finger proteins perform broader functions in transcriptional regulation through their DNA binding ability. Our data revealed that the posttranslational epigenetic-independent silencing against TEs was a result of the protein binding ability of the Znf-BED domain.
[Mh] Termos MeSH primário: Antirrhinum/metabolismo
Membrana Celular/metabolismo
Proteínas de Plantas/metabolismo
Transposases/química
Transposases/metabolismo
Dedos de Zinco
[Mh] Termos MeSH secundário: Sequência de Aminoácidos
Antirrhinum/genética
Sequência Conservada
Elementos de DNA Transponíveis
Epigênese Genética
Proteínas de Plantas/química
Proteínas de Plantas/genética
Proteínas Recombinantes de Fusão/genética
Proteínas Recombinantes de Fusão/metabolismo
Transposases/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA Transposable Elements); 0 (Plant Proteins); 0 (Recombinant Fusion Proteins); EC 2.7.7.- (Transposases)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171003
[Lr] Data última revisão:
171003
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161224
[St] Status:MEDLINE
[do] DOI:10.1104/pp.16.00996


  6 / 172 MEDLINE  
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[PMID]:27412003
[Au] Autor:Locatelli FF; Fernandez PC; Smith BH
[Ad] Endereço:School of Life Sciences, PO Box 874501, Arizona State University, Tempe, AZ 85287, USA.
[Ti] Título:Learning about natural variation of odor mixtures enhances categorization in early olfactory processing.
[So] Source:J Exp Biol;219(Pt 17):2752-62, 2016 Sep 01.
[Is] ISSN:1477-9145
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Natural odors are typically mixtures of several chemical components. Mixtures vary in composition among odor objects that have the same meaning. Therefore a central 'categorization' problem for an animal as it makes decisions about odors in natural contexts is to correctly identify odor variants that have the same meaning and avoid variants that have a different meaning. We propose that identified mechanisms of associative and non-associative plasticity in early sensory processing in the insect antennal lobe and mammalian olfactory bulb are central to solving this problem. Accordingly, this plasticity should work to improve categorization of odors that have the opposite meanings in relation to important events. Using synthetic mixtures designed to mimic natural odor variation among flowers, we studied how honey bees learn about and generalize among floral odors associated with food. We behaviorally conditioned honey bees on a difficult odor discrimination problem using synthetic mixtures that mimic natural variation among snapdragon flowers. We then used calcium imaging to measure responses of projection neurons of the antennal lobe, which is the first synaptic relay of olfactory sensory information in the brain, to study how ensembles of projection neurons change as a result of behavioral conditioning. We show how these ensembles become 'tuned' through plasticity to improve categorization of odors that have the different meanings. We argue that this tuning allows more efficient use of the immense coding space of the antennal lobe and olfactory bulb to solve the categorization problem. Our data point to the need for a better understanding of the 'statistics' of the odor space.
[Mh] Termos MeSH primário: Abelhas/fisiologia
Aprendizagem
Odorantes/análise
Condutos Olfatórios/fisiologia
[Mh] Termos MeSH secundário: Animais
Antirrhinum/fisiologia
Antenas de Artrópodes/fisiologia
Comportamento Animal
Cálcio/metabolismo
Condicionamento (Psicologia)
Flores/fisiologia
Imagem Tridimensional
Neurônios/fisiologia
Estimulação Física
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
SY7Q814VUP (Calcium)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170809
[Lr] Data última revisão:
170809
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160715
[St] Status:MEDLINE
[do] DOI:10.1242/jeb.141465


  7 / 172 MEDLINE  
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[PMID]:26945856
[Au] Autor:Wang F; Zhu H; Kong W; Peng R; Liu Q; Yao Q
[Ad] Endereço:Shanghai Key Laboratory of Agricultural Genetic Breeding, Biotech Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai, 201106, China.
[Ti] Título:The Antirrhinum AmDEL gene enhances flavonoids accumulation and salt and drought tolerance in transgenic Arabidopsis.
[So] Source:Planta;244(1):59-73, 2016 Jul.
[Is] ISSN:1432-2048
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:MAIN CONCLUSION: A basic helix-loop-helix (bHLH) transcription factor gene from Antirrhinum, AmDEL , increases flavonoids accumulation and enhances salt and drought tolerance via up-regulating flavonoid biosynthesis, proline biosynthesis and ROS scavenging genes in transgenic Arabidopsis. In plants, transcriptional regulation is the most important tools for increasing flavonoid biosynthesis. The AmDEL gene, as a basic helix-loop-helix transcription factor gene from Antirrhinum, has been shown to increase flavonoids accumulation in tomato. However, its role in tolerance to abiotic stresses has not yet been investigated. In this study, the codon-optimized AmDEL gene was chemically synthesized. Subcellular localization analysis in onion epidermal cells indicated that AmDEL protein was localized to the nucleus. Expression analysis in yeast showed that the full length of AmDEL exhibited transcriptional activation. Overexpression of AmDEL significantly increased flavonoids accumulation and enhanced salt and drought tolerance in transgenic Arabidopsis plants. Real-time quantitative PCR analysis showed that overexpression of AmDEL resulted in the up-regulation of genes involved in flavonoid biosynthesis, proline biosynthesis and ROS scavenging under salt and drought stresses. Meanwhile, Western blot and enzymatic analyses showed that the activities of phenylalanine ammonia lyase, chalcone isomerase, dihydroflavonol reductase, pyrroline-5-carboxylate synthase, superoxide dismutase and peroxidase were also increased. Further components analyses indicated that the significant increase of proline and relative water content and the significant reduction of H2O2 and malonaldehyde content were observed under salt and drought stresses. In addition, the rates of electrolyte leakage and water loss were reduced in transgenic plants. These findings imply functions of AmDEL in accumulation of flavonoids and tolerance to salt and drought stresses. The AmDEL gene has the potential to be used to increase the content of valuable flavonoids and improve tolerance to abiotic stresses in plants.
[Mh] Termos MeSH primário: Antirrhinum/genética
Arabidopsis/genética
Fatores de Transcrição Hélice-Alça-Hélice Básicos/genética
Secas
Flavonoides/metabolismo
Proteínas de Plantas/genética
Tolerância a Sal/genética
[Mh] Termos MeSH secundário: Aciltransferases/genética
Aciltransferases/metabolismo
Adaptação Fisiológica/genética
Sequência de Aminoácidos
Arabidopsis/metabolismo
Proteínas de Arabidopsis/genética
Proteínas de Arabidopsis/metabolismo
Sequência de Bases
Fatores de Transcrição Hélice-Alça-Hélice Básicos/classificação
Fatores de Transcrição Hélice-Alça-Hélice Básicos/metabolismo
Western Blotting
Núcleo Celular/metabolismo
Regulação da Expressão Gênica de Plantas
Microscopia Confocal
Oxirredutases/genética
Oxirredutases/metabolismo
Peroxidase/genética
Peroxidase/metabolismo
Filogenia
Proteínas de Plantas/metabolismo
Plantas Geneticamente Modificadas
Reação em Cadeia da Polimerase Via Transcriptase Reversa
Homologia de Sequência de Aminoácidos
Superóxido Dismutase/genética
Superóxido Dismutase/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arabidopsis Proteins); 0 (Basic Helix-Loop-Helix Transcription Factors); 0 (Flavonoids); 0 (Plant Proteins); EC 1.- (Oxidoreductases); EC 1.11.1.7 (Peroxidase); EC 1.15.1.1 (Superoxide Dismutase); EC 1.3.- (flavonol synthase); EC 2.3.- (Acyltransferases); EC 2.3.1.74 (flavanone synthetase)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:171005
[Lr] Data última revisão:
171005
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160307
[St] Status:MEDLINE
[do] DOI:10.1007/s00425-016-2489-3


  8 / 172 MEDLINE  
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[PMID]:26804132
[Au] Autor:Weiss J; Alcantud-Rodriguez R; Toksöz T; Egea-Cortines M
[Ad] Endereço:Genetica Molecular, Instituto de Biotecnología Vegetal, Universidad Politécnica de Cartagena, 30202 Cartagena, Spain.
[Ti] Título:Meristem maintenance, auxin, jasmonic and abscisic acid pathways as a mechanism for phenotypic plasticity in Antirrhinum majus.
[So] Source:Sci Rep;6:19807, 2016 Jan 25.
[Is] ISSN:2045-2322
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Plants grow under climatic changing conditions that cause modifications in vegetative and reproductive development. The degree of changes in organ development i.e. its phenotypic plasticity seems to be determined by the organ identity and the type of environmental cue. We used intraspecific competition and found that Antirrhinum majus behaves as a decoupled species for lateral organ size and number. Crowding causes decreases in leaf size and increased leaf number whereas floral size is robust and floral number is reduced. Genes involved in shoot apical meristem maintenance like ROA and HIRZ, cell cycle (CYCD3a; CYCD3b, HISTONE H4) or organ polarity (GRAM) were not significantly downregulated under crowding conditions. A transcriptomic analysis of inflorescence meristems showed Gene Ontology enriched pathways upregulated including Jasmonic and Abscisic acid synthesis and or signalling. Genes involved in auxin synthesis such as AmTAR2 and signalling AmANT were not affected by crowding. In contrast, AmJAZ1, AmMYB21, AmOPCL1 and AmABA2 were significantly upregulated. Our work provides a mechanistic working hypothesis where a robust SAM and stable auxin signalling enables a homogeneous floral size while changes in JA and ABA signalling maybe responsible for the decreased leaf size and floral number.
[Mh] Termos MeSH primário: Antirrhinum/genética
Meristema/genética
Folhas de Planta/genética
Proteínas de Plantas/biossíntese
[Mh] Termos MeSH secundário: Ácido Abscísico/genética
Ácido Abscísico/metabolismo
Antirrhinum/crescimento & desenvolvimento
Antirrhinum/metabolismo
Ciclopentanos/metabolismo
Flores/genética
Flores/crescimento & desenvolvimento
Perfilação da Expressão Gênica
Regulação da Expressão Gênica de Plantas
Ácidos Indolacéticos/metabolismo
Meristema/crescimento & desenvolvimento
Meristema/metabolismo
Oxilipinas/metabolismo
Folhas de Planta/crescimento & desenvolvimento
Proteínas de Plantas/genética
Brotos de Planta/genética
Brotos de Planta/crescimento & desenvolvimento
Plantas Geneticamente Modificadas
Transdução de Sinais/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Cyclopentanes); 0 (Indoleacetic Acids); 0 (Oxylipins); 0 (Plant Proteins); 72S9A8J5GW (Abscisic Acid); RC4W0G9YUK (jasmone)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160126
[St] Status:MEDLINE
[do] DOI:10.1038/srep19807


  9 / 172 MEDLINE  
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[PMID]:26263186
[Au] Autor:Jaworski CC; Andalo C; Raynaud C; Simon V; Thébaud C; Chave J
[Ad] Endereço:CNRS-Université Paul Sabatier, UMR 5174, Laboratoire Evolution et Diversité Biologique, Toulouse, France.
[Ti] Título:The Influence of Prior Learning Experience on Pollinator Choice: An Experiment Using Bumblebees on Two Wild Floral Types of Antirrhinum majus.
[So] Source:PLoS One;10(8):e0130225, 2015.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Understanding how pollinator behavior may influence pollen transmission across floral types is a major challenge, as pollinator decision depends on a complex range of environmental cues and prior experience. Here we report an experiment using the plant Antirrhinum majus and the bumblebee Bombus terrestris to investigate how prior learning experience may affect pollinator preferences between floral types when these are presented together. We trained naive bumblebees to forage freely on flowering individuals of either A. majus pseudomajus (magenta flowers) or A. majus striatum (yellow flowers) in a flight cage. We then used a Y-maze device to expose trained bumblebees to a dual choice between the floral types. We tested the influence of training on their choice, depending on the type of plant signals available (visual signals, olfactory signals, or both). Bumblebees had no innate preference for either subspecies. Bumblebees trained on the yellow-flowered subspecies later preferred the yellow type, even when only visual or only olfactory signals were available, and their preference was not reinforced when both signal types were available. In contrast, bumblebees trained on the magenta-flowered subspecies showed no further preference between floral types and took slightly more time to make their choice. Since pollinator constancy has been observed in wild populations of A. majus with mixed floral types, we suggest that such constancy likely relies on short-term memory rather than acquired preference through long-term memory induced by prior learning.
[Mh] Termos MeSH primário: Antirrhinum
Abelhas
Comportamento Animal
Polinização
[Mh] Termos MeSH secundário: Animais
Flores
Aprendizagem
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1605
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150812
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0130225


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[PMID]:26220938
[Au] Autor:Kusters E; Della Pina S; Castel R; Souer E; Koes R
[Ad] Endereço:Department of Molecular Cell Biology, VU-University, de Boelelaan 1087, Amsterdam 1081HV, The Netherlands.
[Ti] Título:Changes in cis-regulatory elements of a key floral regulator are associated with divergence of inflorescence architectures.
[So] Source:Development;142(16):2822-31, 2015 Aug 15.
[Is] ISSN:1477-9129
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Higher plant species diverged extensively with regard to the moment (flowering time) and position (inflorescence architecture) at which flowers are formed. This seems largely caused by variation in the expression patterns of conserved genes that specify floral meristem identity (FMI), rather than changes in the encoded proteins. Here, we report a functional comparison of the promoters of homologous FMI genes from Arabidopsis, petunia, tomato and Antirrhinum. Analysis of promoter-reporter constructs in petunia and Arabidopsis, as well as complementation experiments, showed that the divergent expression of leafy (LFY) and the petunia homolog aberrant leaf and flower (ALF) results from alterations in the upstream regulatory network rather than cis-regulatory changes. The divergent expression of unusual floral organs (UFO) from Arabidopsis, and the petunia homolog double top (DOT), however, is caused by the loss or gain of cis-regulatory promoter elements, which respond to trans-acting factors that are expressed in similar patterns in both species. Introduction of pUFO:UFO causes no obvious defects in Arabidopsis, but in petunia it causes the precocious and ectopic formation of flowers. This provides an example of how a change in a cis-regulatory region can account for a change in the plant body plan.
[Mh] Termos MeSH primário: Proteínas de Arabidopsis/metabolismo
Flores/crescimento & desenvolvimento
Regulação da Expressão Gênica no Desenvolvimento/fisiologia
Regulação da Expressão Gênica de Plantas/fisiologia
Meristema/crescimento & desenvolvimento
Regiões Promotoras Genéticas/fisiologia
Fatores de Transcrição/metabolismo
[Mh] Termos MeSH secundário: Antirrhinum
Arabidopsis
Proteínas de Arabidopsis/genética
Sequência de Bases
Primers do DNA/genética
Flores/metabolismo
Regulação da Expressão Gênica no Desenvolvimento/genética
Regulação da Expressão Gênica de Plantas/genética
Lycopersicon esculentum
Meristema/metabolismo
Dados de Sequência Molecular
Petunia
Regiões Promotoras Genéticas/genética
Reação em Cadeia da Polimerase em Tempo Real
Análise de Sequência de DNA
Especificidade da Espécie
Fatores de Transcrição/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Arabidopsis Proteins); 0 (DNA Primers); 0 (LFY protein, Arabidopsis); 0 (Transcription Factors); 0 (UFO protein, Arabidopsis)
[Em] Mês de entrada:1511
[Cu] Atualização por classe:150819
[Lr] Data última revisão:
150819
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150730
[St] Status:MEDLINE
[do] DOI:10.1242/dev.121905



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