Base de dados : MEDLINE
Pesquisa : G07.345.249.845.700 [Categoria DeCS]
Referências encontradas : 417 [refinar]
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  1 / 417 MEDLINE  
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[PMID]:27770560
[Au] Autor:Zhang Y; Yu Q; Jiang N; Yan X; Wang C; Wang Q; Liu J; Zhu M; Bednarek SY; Xu J; Pan J
[Ad] Endereço:College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, 321004, China.
[Ti] Título:Clathrin regulates blue light-triggered lateral auxin distribution and hypocotyl phototropism in Arabidopsis.
[So] Source:Plant Cell Environ;40(1):165-176, 2017 Jan.
[Is] ISSN:1365-3040
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Phototropism is the process by which plants grow towards light in order to maximize the capture of light for photosynthesis, which is particularly important for germinating seedlings. In Arabidopsis, hypocotyl phototropism is predominantly triggered by blue light (BL), which has a profound effect on the establishment of asymmetric auxin distribution, essential for hypocotyl phototropism. Two auxin efflux transporters ATP-binding cassette B19 (ABCB19) and PIN-formed 3 (PIN3) are known to mediate the effect of BL on auxin distribution in the hypocotyl, but the details for how BL triggers PIN3 lateralization remain poorly understood. Here, we report a critical role for clathrin in BL-triggered, PIN3-mediated asymmetric auxin distribution in hypocotyl phototropism. We show that unilateral BL induces relocalization of clathrin in the hypocotyl. Loss of clathrin light chain 2 (CLC2) and CLC3 affects endocytosis and lateral distribution of PIN3 thereby impairing BL-triggered establishment of asymmetric auxin distribution and consequently, phototropic bending. Conversely, auxin efflux inhibitors N-1-naphthylphthalamic acid and 2,3,5-triiodobenzoic acid affect BL-induced relocalization of clathrin, endocytosis and lateralization of PIN3 as well as asymmetric distribution of auxin. These results together demonstrate an important interplay between auxin and clathrin function that dynamically regulates BL-triggered hypocotyl phototropism in Arabidopsis.
[Mh] Termos MeSH primário: Arabidopsis/fisiologia
Arabidopsis/efeitos da radiação
Clatrina/metabolismo
Hipocótilo/fisiologia
Ácidos Indolacéticos/metabolismo
Luz
Fototropismo/efeitos da radiação
[Mh] Termos MeSH secundário: Proteínas de Arabidopsis/metabolismo
Endocitose/efeitos da radiação
Hipocótilo/efeitos da radiação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arabidopsis Proteins); 0 (Clathrin); 0 (Indoleacetic Acids)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171212
[Lr] Data última revisão:
171212
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161023
[St] Status:MEDLINE
[do] DOI:10.1111/pce.12854


  2 / 417 MEDLINE  
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[PMID]:28663371
[Au] Autor:Petersen J; Inoue SI; Kelly SM; Sullivan S; Kinoshita T; Christie JM
[Ad] Endereço:From the Institute of Molecular, Cell, and Systems Biology, College of Medical, Veterinary, and Life Sciences, University of Glasgow, Bower Building, Glasgow G12 8QQ, United Kingdom.
[Ti] Título:Functional characterization of a constitutively active kinase variant of phototropin 1.
[So] Source:J Biol Chem;292(33):13843-13852, 2017 Aug 18.
[Is] ISSN:1083-351X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Phototropins (phots) are plasma membrane-associated serine/threonine kinases that coordinate a range of processes linked to optimizing photosynthetic efficiency in plants. These photoreceptors contain two light-, oxygen-, or voltage-sensing (LOV) domains within their N terminus, with each binding one molecule of flavin mononucleotide as a UV/blue light-absorbing chromophore. Although phots contain two LOV domains, light-induced activation of the C-terminal kinase domain and subsequent receptor autophosphorylation is controlled primarily by the A'α-LOV2-Jα photosensory module. Mutations that disrupt interactions between the LOV2 core and its flanking helical segments can uncouple this mode of light regulation. However, the impact of these mutations on phot function in has not been explored. Here we report that histidine substitution of Arg-472 located within the A'α-helix of phot1 constitutively activates phot1 kinase activity without affecting LOV2 photochemistry. Expression analysis of phot1 R472H in the phot-deficient mutant confirmed that it is autophosphorylated in darkness but unable to initiate phot1 signaling in the absence of light. Instead, we found that phot1 R472H is poorly functional under low-light conditions but can restore phototropism, chloroplast accumulation, stomatal opening, and leaf positioning and expansion at higher light intensities. Our findings suggest that can adapt to the elevated phosphorylation status of the phot1 R472H mutant in part by reducing its stability, whereas the activity of the mutant under high-light conditions can be attributed to additional increases in LOV2-mediated photoreceptor autophosphorylation.
[Mh] Termos MeSH primário: Proteínas de Arabidopsis/metabolismo
Arabidopsis/enzimologia
Proteínas de Ligação a DNA/metabolismo
Fosfoproteínas/metabolismo
Plantas Geneticamente Modificadas/enzimologia
Processamento de Proteína Pós-Traducional
[Mh] Termos MeSH secundário: Substituição de Aminoácidos
Arabidopsis/genética
Arabidopsis/metabolismo
Arabidopsis/efeitos da radiação
Proteínas de Arabidopsis/química
Proteínas de Arabidopsis/genética
Dicroísmo Circular
Proteínas de Ligação a DNA/química
Proteínas de Ligação a DNA/genética
Ativação Enzimática/efeitos da radiação
Estabilidade Enzimática/efeitos da radiação
Proteínas de Fluorescência Verde/genética
Proteínas de Fluorescência Verde/metabolismo
Isoenzimas/genética
Isoenzimas/metabolismo
Luz
Fosfoproteínas/química
Fosfoproteínas/genética
Fosforilação/efeitos da radiação
Processos Fotoquímicos
Fototropismo
Plantas Geneticamente Modificadas/genética
Plantas Geneticamente Modificadas/metabolismo
Plantas Geneticamente Modificadas/efeitos da radiação
Mutação Puntual
Conformação Proteica em alfa-Hélice
Domínios e Motivos de Interação entre Proteínas
Processamento de Proteína Pós-Traducional/efeitos da radiação
Estabilidade Proteica/efeitos da radiação
Proteínas Recombinantes de Fusão/metabolismo
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arabidopsis Proteins); 0 (DNA-Binding Proteins); 0 (Isoenzymes); 0 (LOV2 protein, Arabidopsis); 0 (NPH1 protein, Arabidopsis); 0 (Phosphoproteins); 0 (Recombinant Fusion Proteins); 147336-22-9 (Green Fluorescent Proteins)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170906
[Lr] Data última revisão:
170906
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170701
[St] Status:MEDLINE
[do] DOI:10.1074/jbc.M117.799643


  3 / 417 MEDLINE  
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[PMID]:27717456
[Au] Autor:Vanhaelewyn L; Schumacher P; Poelman D; Fankhauser C; Van Der Straeten D; Vandenbussche F
[Ad] Endereço:Laboratory of Functional Plant Biology, Department of Physiology, Faculty of Sciences, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium.
[Ti] Título:REPRESSOR OF ULTRAVIOLET-B PHOTOMORPHOGENESIS function allows efficient phototropin mediated ultraviolet-B phototropism in etiolated seedlings.
[So] Source:Plant Sci;252:215-221, 2016 Nov.
[Is] ISSN:1873-2259
[Cp] País de publicação:Ireland
[La] Idioma:eng
[Ab] Resumo:Ultraviolet B (UV-B) light is a part of the solar radiation which has significant effects on plant morphology, even at low doses. In Arabidopsis, many of these morphological changes have been attributed to a specific UV-B receptor, UV resistance locus 8 (UVR8). Recent findings showed that next to phototropin regulated phototropism, UVR8 mediated signaling is able of inducing directional bending towards UV-B light in etiolated seedlings of Arabidopsis, in a phototropin independent manner. In this study, kinetic analysis of phototropic bending was used to evaluate the relative contribution of each of these pathways in UV-B mediated phototropism. Diminishing UV-B light intensity favors the importance of phototropins. Molecular and genetic analyses suggest that UV-B is capable of inducing phototropin signaling relying on phototropin kinase activity and regulation of NPH3. Moreover, enhanced UVR8 responses in the UV-B hypersensitive rup1rup2 mutants interferes with the fast phototropin mediated phototropism. Together the data suggest that phototropins are the most important receptors for UV-B induced phototropism in etiolated seedlings, and a RUP mediated negative feedback pathway prevents UVR8 signaling to interfere with the phototropin dependent response.
[Mh] Termos MeSH primário: Arabidopsis/efeitos da radiação
Fototropinas/fisiologia
Fototropismo
Raios Ultravioleta
[Mh] Termos MeSH secundário: Arabidopsis/crescimento & desenvolvimento
Arabidopsis/metabolismo
Proteínas de Arabidopsis/genética
Proteínas de Arabidopsis/metabolismo
Proteínas de Arabidopsis/fisiologia
Proteínas Cromossômicas não Histona/genética
Proteínas Cromossômicas não Histona/metabolismo
Proteínas Cromossômicas não Histona/fisiologia
Cinética
Transdução de Sinal Luminoso
Fototropinas/genética
Fototropinas/metabolismo
Plântulas/crescimento & desenvolvimento
Plântulas/metabolismo
Plântulas/efeitos da radiação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arabidopsis Proteins); 0 (Chromosomal Proteins, Non-Histone); 0 (Phototropins); 0 (Uvr8 protein, Arabidopsis)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170417
[Lr] Data última revisão:
170417
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161009
[St] Status:MEDLINE


  4 / 417 MEDLINE  
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[PMID]:27545835
[Au] Autor:Sullivan S; Takemiya A; Kharshiing E; Cloix C; Shimazaki KI; Christie JM
[Ad] Endereço:Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Bower Building, Glasgow, G12 8QQ, UK.
[Ti] Título:Functional characterization of Arabidopsis phototropin 1 in the hypocotyl apex.
[So] Source:Plant J;88(6):907-920, 2016 Dec.
[Is] ISSN:1365-313X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Phototropin (phot1) is a blue light-activated plasma membrane-associated kinase that acts as the principal photoreceptor for shoot phototropism in Arabidopsis in conjunction with the signalling component Non-Phototropic Hypocotyl 3 (NPH3). PHOT1 is uniformly expressed throughout the Arabidopsis hypocotyl, yet decapitation experiments have localized the site of light perception to the upper hypocotyl. This prompted us to investigate in more detail the functional role of the hypocotyl apex, and the regions surrounding it, in establishing phototropism. We used a non-invasive approach where PHOT1-GFP (P1-GFP) expression was targeted to the hypocotyl apex of the phot-deficient mutant using the promoters of CUP-SHAPED COTYLEDON 3 (CUC3) and AINTEGUMENTA (ANT). Expression of CUC3::P1-GFP was clearly visible at the hypocotyl apex, with weaker expression in the cotyledons, whereas ANT::P1-GFP was specifically targeted to the developing leaves. Both lines showed impaired curvature to 0.005 µmol m  sec unilateral blue light, indicating that regions below the apical meristem are necessary for phototropism. Curvature was however apparent at higher fluence rates. Moreover, CUC3::P1-GFP partially or fully complemented petiole positioning, leaf flattening and chloroplast accumulation, but not stomatal opening. Yet, tissue analysis of NPH3 de-phosphorylation showed that CUC3::P1-GFP and ANT::P1-GFP mis-express very low levels of phot1 that likely account for this responsiveness. Our spatial targeting approach therefore excludes the hypocotyl apex as the site for light perception for phototropism and shows that phot1-mediated NPH3 de-phosphorylation is tissue autonomous and occurs more prominently in the basal hypocotyl.
[Mh] Termos MeSH primário: Proteínas de Arabidopsis/metabolismo
Arabidopsis/metabolismo
Hipocótilo/metabolismo
Fosfoproteínas/metabolismo
[Mh] Termos MeSH secundário: Arabidopsis/genética
Proteínas de Arabidopsis/genética
Regulação da Expressão Gênica de Plantas/genética
Regulação da Expressão Gênica de Plantas/fisiologia
Hipocótilo/genética
Fosfoproteínas/genética
Fosforilação/genética
Fosforilação/fisiologia
Fototropismo/genética
Fototropismo/fisiologia
Fatores de Transcrição/genética
Fatores de Transcrição/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (AINTEGUMENTA protein, Arabidopsis); 0 (Arabidopsis Proteins); 0 (CUC3 protein, Arabidopsis); 0 (NPH1 protein, Arabidopsis); 0 (NPH3 protein, Arabidopsis); 0 (Phosphoproteins); 0 (Transcription Factors)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171107
[Lr] Data última revisão:
171107
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160823
[St] Status:MEDLINE
[do] DOI:10.1111/tpj.13313


  5 / 417 MEDLINE  
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[PMID]:27507239
[Au] Autor:Vandenbrink JP; Herranz R; Medina FJ; Edelmann RE; Kiss JZ
[Ad] Endereço:Department of Biology, University of Mississippi, University, Oxford, MS, 38677, USA.
[Ti] Título:A novel blue-light phototropic response is revealed in roots of Arabidopsis thaliana in microgravity.
[So] Source:Planta;244(6):1201-1215, 2016 Dec.
[Is] ISSN:1432-2048
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:MAIN CONCLUSION: Blue-light positive phototropism in roots is masked by gravity and revealed in conditions of microgravity. In addition, the magnitude of red-light positive phototropic curvature is correlated to the magnitude of gravity. Due to their sessile nature, plants utilize environmental cues to grow and respond to their surroundings. Two of these cues, light and gravity, play a substantial role in plant orientation and directed growth movements (tropisms). However, very little is currently known about the interaction between light- (phototropic) and gravity (gravitropic)-mediated growth responses. Utilizing the European Modular Cultivation System on board the International Space Station, we investigated the interaction between phototropic and gravitropic responses in three Arabidopsis thaliana genotypes, Landsberg wild type, as well as mutants of phytochrome A and phytochrome B. Onboard centrifuges were used to create a fractional gravity gradient ranging from reduced gravity up to 1g. A novel positive blue-light phototropic response of roots was observed during conditions of microgravity, and this response was attenuated at 0.1g. In addition, a red-light pretreatment of plants enhanced the magnitude of positive phototropic curvature of roots in response to blue illumination. In addition, a positive phototropic response of roots was observed when exposed to red light, and a decrease in response was gradual and correlated with the increase in gravity. The positive red-light phototropic curvature of hypocotyls when exposed to red light was also confirmed. Both red-light and blue-light phototropic responses were also shown to be affected by directional light intensity. To our knowledge, this is the first characterization of a positive blue-light phototropic response in Arabidopsis roots, as well as the first description of the relationship between these phototropic responses in fractional or reduced gravities.
[Mh] Termos MeSH primário: Arabidopsis/fisiologia
Fototropismo/fisiologia
Raízes de Plantas/fisiologia
[Mh] Termos MeSH secundário: Arabidopsis/efeitos da radiação
Luz
Fototropismo/efeitos da radiação
Raízes de Plantas/efeitos da radiação
Ausência de Peso
[Pt] Tipo de publicação:JOURNAL ARTICLE
[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:160811
[St] Status:MEDLINE


  6 / 417 MEDLINE  
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[PMID]:27493185
[Au] Autor:Atamian HS; Creux NM; Brown EA; Garner AG; Blackman BK; Harmer SL
[Ad] Endereço:Department of Plant Biology, University of California, One Shields Avenue, Davis, CA 95616, USA.
[Ti] Título:Circadian regulation of sunflower heliotropism, floral orientation, and pollinator visits.
[So] Source:Science;353(6299):587-90, 2016 Aug 05.
[Is] ISSN:1095-9203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Young sunflower plants track the Sun from east to west during the day and then reorient during the night to face east in anticipation of dawn. In contrast, mature plants cease movement with their flower heads facing east. We show that circadian regulation of directional growth pathways accounts for both phenomena and leads to increased vegetative biomass and enhanced pollinator visits to flowers. Solar tracking movements are driven by antiphasic patterns of elongation on the east and west sides of the stem. Genes implicated in control of phototropic growth, but not clock genes, are differentially expressed on the opposite sides of solar tracking stems. Thus, interactions between environmental response pathways and the internal circadian oscillator coordinate physiological processes with predictable changes in the environment to influence growth and reproduction.
[Mh] Termos MeSH primário: Ritmo Circadiano/fisiologia
Flores/fisiologia
Helianthus/crescimento & desenvolvimento
Fototropismo/fisiologia
Polinização
[Mh] Termos MeSH secundário: Animais
Relógios Circadianos/genética
Relógios Circadianos/fisiologia
Ritmo Circadiano/genética
Flores/genética
Regulação da Expressão Gênica no Desenvolvimento
Regulação da Expressão Gênica de Plantas
Helianthus/genética
Fototropismo/genética
Luz Solar
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Em] Mês de entrada:1609
[Cu] Atualização por classe:160805
[Lr] Data última revisão:
160805
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160806
[St] Status:MEDLINE
[do] DOI:10.1126/science.aaf9793


  7 / 417 MEDLINE  
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[PMID]:27252295
[Au] Autor:Trujillo CM; Anderson TR; Pelaez NJ
[Ad] Endereço:Purdue International Biology Education Research Group (PIBERG), Department of Biological Sciences, Purdue University, West Lafayette, IN 47907 calebtru@gmail.com.
[Ti] Título:Exploring the MACH Model's Potential as a Metacognitive Tool to Help Undergraduate Students Monitor Their Explanations of Biological Mechanisms.
[So] Source:CBE Life Sci Educ;15(2), 2016.
[Is] ISSN:1931-7913
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:When undergraduate biology students learn to explain biological mechanisms, they face many challenges and may overestimate their understanding of living systems. Previously, we developed the MACH model of four components used by expert biologists to explain mechanisms: Methods, Analogies, Context, and How. This study explores the implementation of the model in an undergraduate biology classroom as an educational tool to address some of the known challenges. To find out how well students' written explanations represent components of the MACH model before and after they were taught about it and why students think the MACH model was useful, we conducted an exploratory multiple case study with four interview participants. We characterize how two students explained biological mechanisms before and after a teaching intervention that used the MACH components. Inductive analysis of written explanations and interviews showed that MACH acted as an effective metacognitive tool for all four students by helping them to monitor their understanding, communicate explanations, and identify explanatory gaps. Further research, though, is needed to more fully substantiate the general usefulness of MACH for promoting students' metacognition about their understanding of biological mechanisms.
[Mh] Termos MeSH primário: Biologia/educação
Metacognição
Modelos Educacionais
Estudantes/psicologia
Universidades
[Mh] Termos MeSH secundário: Seres Humanos
Luz
Transdução de Sinal Luminoso/efeitos da radiação
Fototropismo
Fitocromo/metabolismo
Plantas/efeitos da radiação
Teratogênios
Talidomida/efeitos adversos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
0 (Teratogens); 11121-56-5 (Phytochrome); 4Z8R6ORS6L (Thalidomide)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160603
[St] Status:MEDLINE


  8 / 417 MEDLINE  
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[PMID]:27166513
[Au] Autor:Kumar R; Wu SW; Iswanto AB; Kumar D; Han X; Kim JY
[Ad] Endereço:Division of Applied Life Science (BK21 plus program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University.
[Ti] Título:A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response.
[So] Source:J Vis Exp;(110), 2016 Apr 17.
[Is] ISSN:1940-087X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The plant hormone auxin plays an important role in many growth and developmental processes, including tropic responses to light and gravity. The establishment of an auxin gradient is a key event leading to phototropism and gravitropism. Previously, polar auxin transport (PAT) was shown to establish an auxin gradient in different cellular domains of plants. However, Han et al. recently demonstrated that for proper auxin gradient formation, plasmodesmal callose-mediated symplasmic connectivity between the adjacent cells is also a critical factor. In this manuscript, the strategy to elucidate the role of particular genes, which can affect phototropism and gravitropism by altering the symplasmic connectivity through modulating plasmodesmal callose synthesis, is discussed. The first step is to screen aberrant tropic responses from 3-day-old etiolated seedlings of mutants or over-expression lines of a gene along with the wild type. This preliminary screening can lead to the identification of a range of genes functioning in PAT or controlling symplasmic connectivity. The second screening involves the sorting of candidates that show altered tropic responses by affecting symplasmic connectivity. To address such candidates, the movement of a symplasmic tracer and the deposition of plasmodesmal callose were examined. This strategy would be useful to explore new candidate genes that can regulate symplasmic connectivity directly or indirectly during tropic responses and other developmental processes.
[Mh] Termos MeSH primário: Gravitropismo/fisiologia
Ácidos Indolacéticos/metabolismo
Fototropismo/fisiologia
[Mh] Termos MeSH secundário: Transporte Biológico
Luz
[Pt] Tipo de publicação:JOURNAL ARTICLE; VIDEO-AUDIO MEDIA
[Nm] Nome de substância:
0 (Indoleacetic Acids)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170810
[Lr] Data última revisão:
170810
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160512
[St] Status:MEDLINE
[do] DOI:10.3791/53513


  9 / 417 MEDLINE  
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[PMID]:27033355
[Au] Autor:Vinterhalter D; Savic J; Stanisic M; Jovanovic Z; Vinterhalter B
[Ad] Endereço:Institute for Biological Research, University of Belgrade, Bulevar Despota Stefana 142, 11060, Belgrade, Serbia. dvinterhalter@yahoo.com.
[Ti] Título:Interaction with gravitropism, reversibility and lateral movements of phototropically stimulated potato shoots.
[So] Source:J Plant Res;129(4):759-70, 2016 Jul.
[Is] ISSN:1618-0860
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:Phototropic (PT) and gravitropic (GT) bending are the two major tropic movements that determine the spatial position of potato shoots. We studied PT bending of potato plantlets grown under long-day photoperiods in several prearranged position setups providing different interactions with the GT response. Starting with the standard PT stimulation setup composed of unilateral irradiation of vertically positioned shoots, experiments were also done in antagonistic and synergistic setups and in treatments with horizontal displacement of the light source. In the standard setup, PT bending suppressed the GT bending, which could occur only if the PT stimulation was cancelled. The antagonistic position, with phototropism and gravitropism attempting to bend shoots in opposite directions, showed phototropism and gravitropism as independent bending events with the outcome varying throughout the day reflecting diurnal changes in the competence of individual tropic components. Whilst gravitropism was constant, phototropism had a marked daily fluctuation of its magnitude with a prominent morning maximum starting an hour after the dawn in the growth room and lasting for the next 6 h. When phototropism and gravitropism were aligned in a synergistic position, stimulating shoot bending in the same direction, there was little quantitative addition of their individual effects. The long period of morning PT bending maximum enabled multiple PT bending events to be conducted in succession, each one preceded by a separate lag phase. Studies of secondary PT events showed that potato plantlets can follow and adjust their shoot position in response to both vertical and horizontal movements of a light source. PT bending was reversible, since the 180° horizontal change of a blue light (BL) source position resulted in reversal of bending direction after a 20-min-long lag phase.
[Mh] Termos MeSH primário: Gravitropismo/fisiologia
Fototropismo/fisiologia
Brotos de Planta/fisiologia
Solanum tuberosum/fisiologia
[Mh] Termos MeSH secundário: Fenômenos Biomecânicos/efeitos da radiação
Gravitropismo/efeitos da radiação
Luz
Fototropismo/efeitos da radiação
Brotos de Planta/efeitos da radiação
Solanum tuberosum/efeitos da radiação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170410
[Lr] Data última revisão:
170410
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160402
[St] Status:MEDLINE
[do] DOI:10.1007/s10265-016-0821-4


  10 / 417 MEDLINE  
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[PMID]:26905653
[Au] Autor:de Wit M; Galvão VC; Fankhauser C
[Ad] Endereço:Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, CH-1015 Lausanne, Switzerland; email: mieke.dewit@unil.ch , vinicius.costagalvao@unil.ch , christian.fankhauser@unil.ch.
[Ti] Título:Light-Mediated Hormonal Regulation of Plant Growth and Development.
[So] Source:Annu Rev Plant Biol;67:513-37, 2016 Apr 29.
[Is] ISSN:1545-2123
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Light is crucial for plant life, and perception of the light environment dictates plant growth, morphology, and developmental changes. Such adjustments in growth and development in response to light conditions are often established through changes in hormone levels and signaling. This review discusses examples of light-regulated processes throughout a plant's life cycle for which it is known how light signals lead to hormonal regulation. Light acts as an important developmental switch in germination, photomorphogenesis, and transition to flowering, and light cues are essential to ensure light capture through architectural changes during phototropism and the shade avoidance response. In describing well-established links between light perception and hormonal changes, we aim to give insight into the mechanisms that enable plants to thrive in variable light environments.
[Mh] Termos MeSH primário: Luz
Fotossíntese
Processos Fototróficos
Fototropismo
Desenvolvimento Vegetal
Reguladores de Crescimento de Planta
Plantas
[Mh] Termos MeSH secundário: Flores
Germinação
Transdução de Sinais
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Plant Growth Regulators)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170719
[Lr] Data última revisão:
170719
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160225
[St] Status:MEDLINE
[do] DOI:10.1146/annurev-arplant-043015-112252



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