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Pesquisa : B01.650.940.800.150.150.150 [Categoria DeCS]
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  1 / 167 MEDLINE  
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[PMID]:28276887
[Au] Autor:Sooksawat N; Meetam M; Kruatrachue M; Pokethitiyook P; Inthorn D
[Ad] Endereço:a Department of Agricultural Engineering and Technology , Faculty of Agriculture and Natural resources, Rajamangala University of Technology Tawan-ok , Bangpra, Chonburi , Thailand.
[Ti] Título:Performance of packed bed column using Chara aculeolata biomass for removal of Pb and Cd ions from wastewater.
[So] Source:J Environ Sci Health A Tox Hazard Subst Environ Eng;52(6):539-546, 2017 May 12.
[Is] ISSN:1532-4117
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Biosorption of Pb and Cd from aqueous solution by biomass of Chara aculeolata was studied in a continuous packed bed column. C. aculeolata in the fixed bed column is capable of decreasing Pb and Cd concentrations from 10 mg/L to a value below the detection limit of 0.02 mg/L. Selective uptake of Pb and Cd in a binary solution resulted in Pb having much higher relative affinity than Cd. The experiments were conducted to study the effects of column design parameters, bed depth, and flow rate on the metal biosorption. Pb uptake capacity of C. aculeolata increased with increased bed depth and decreased flow rate, while Cd uptake capacity increased with increased bed depth but remained constant at any flow rate. The Thomas model was found in a suitable fitness with the experiment data for Pb and Cd (R > 0.90). The efficiency of biosorbent regeneration achieved by 0.1 M HCl was very high, that was, 98% for Pb and 100% for Cd in the third reused cycle. It can be concluded that C. aculeolata is a good biosorbent for treating wastewater having low concentrations of Pb and Cd contamination.
[Mh] Termos MeSH primário: Cádmio/isolamento & purificação
Chara/química
Chumbo/isolamento & purificação
Modelos Teóricos
Águas Residuais/química
Poluentes Químicos da Água/isolamento & purificação
[Mh] Termos MeSH secundário: Adsorção
Biomassa
Íons
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ions); 0 (Waste Water); 0 (Water Pollutants, Chemical); 00BH33GNGH (Cadmium); 2P299V784P (Lead)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170828
[Lr] Data última revisão:
170828
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170310
[St] Status:MEDLINE
[do] DOI:10.1080/10934529.2017.1282774


  2 / 167 MEDLINE  
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[PMID]:28257779
[Au] Autor:Bulychev AA; Komarova AV
[Ad] Endereço:Department of Biophysics, Faculty of Biology, Moscow State University, Moscow 119991, Russia. Electronic address: bulychev@biophys.msu.ru.
[Ti] Título:Photoregulation of photosystem II activity mediated by cytoplasmic streaming in Chara and its relation to pH bands.
[So] Source:Biochim Biophys Acta;1858(5):386-395, 2017 05.
[Is] ISSN:0006-3002
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Chloroplasts in vivo exposed to strong light export assimilates and excess reducing power to the cytoplasm for metabolic conversions and allocation to neighboring and distant organelles. The cytoplasmic streaming, being particularly fast in characean internodes, distributes the exported metabolites from brightly illuminated cell spots to light-limited regions, which is evident from the transient increase in chlorophyll fluorescence of shaded areas in response to illumination of distant cell regions situated upstream the liquid flow. It is not yet known whether long-distance communications between anchored chloroplasts are interfered by pH banding that commonly arises in characean internodes under the action of continuous or fluctuating light. In this study, microfluorometry, pH-microsensors, and local illumination were combined to examine long-distance transport and subsequent reentry of photosynthetic metabolites, including triose phosphates, into chloroplasts of cell regions producing external alkaline and acid bands. The lateral transmission of metabolic signals between distant chloroplasts was found to operate effectively in cell areas underlying acid zones but was almost fully blocked under alkaline zones. The rates of linear electron flow in chloroplasts of these regions were nearly equal under dim background light, but differed substantially at high light when availability of CO , rather than irradiance, was the rate-limiting factor. Different productions of assimilates by chloroplasts underlying CO -sufficient acid and CO -deficient alkaline zones were a cause for contrasting manifestations of long-distance transport of photosynthetic metabolites. Nonuniform cytoplasmic pH in cells exhibiting pH bands might contribute to different activities of metabolic translocators under high and low pH zones.
[Mh] Termos MeSH primário: Chara/efeitos da radiação
Cloroplastos/efeitos da radiação
Corrente Citoplasmática/efeitos da radiação
Transdução de Sinal Luminoso/efeitos da radiação
Luz
Fotossíntese/efeitos da radiação
Complexo de Proteína do Fotossistema II/efeitos da radiação
[Mh] Termos MeSH secundário: Chara/metabolismo
Cloroplastos/metabolismo
Citofotometria
Transferência de Energia
Concentração de Íons de Hidrogênio
Complexo de Proteína do Fotossistema II/metabolismo
Prótons
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Photosystem II Protein Complex); 0 (Protons)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170824
[Lr] Data última revisão:
170824
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170305
[St] Status:MEDLINE


  3 / 167 MEDLINE  
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[PMID]:27091340
[Au] Autor:Bulychev AA; Komarova AV
[Ad] Endereço:Faculty of Biology, Lomonosov Moscow State University, 119992, Moscow, Russia. bulychev@biophys.msu.ru.
[Ti] Título:Implication of long-distance cytoplasmic transport into dynamics of local pH on the surface of microinjured Chara cells.
[So] Source:Protoplasma;254(1):557-567, 2017 Jan.
[Is] ISSN:1615-6102
[Cp] País de publicação:Austria
[La] Idioma:eng
[Ab] Resumo:Cytoplasmic streaming is essential for intracellular communications but its specific functions are not well known. In Chara corallina internodes, long-distance interactions mediated by cyclosis are clearly evident with microscopy-pulse amplitude modulation (PAM) fluorometer under application of localized light (LL) pulses to a remote cell region. Measurements of LL-induced profiles of chlorophyll fluorescence F' at various distances from the LL source suggest that illuminated chloroplasts release into the streaming cytoplasm excess reducing equivalents that are entrained by the fluid flow and transiently reduce the intersystem electron carriers in chloroplasts of downstream shaded areas. The reducing equivalents propagate to distances up to 4.5 mm from the LL source, with the transport rate nearly equal to the velocity of liquid flow. The F' transients disappeared after the arrest of streaming with cytochalasin D and reappeared upon its recovery in washed cells. The F' responses to a distant LL were used as an indicator for the passage of cytosolic reductants across the analyzed cell area during measurements of cell surface pH (pH ) in intact and microperforated internodes. In microwounded cell regions, the LL-induced increase in F' occurred synchronously with the increase in pH , by contrast to a slight decrease in pH observed prior to perforation. The results show that reducing agents transported with the cytoplasmic flow are involved in rapid pH changes on the surface of microinjured cells. A possibility is considered that cytoplasmic reductants are processed by stress-activated plasmalemmal NADPH oxidase carrying electrons to oxygen with the eventual H consumption on the outer cell side.
[Mh] Termos MeSH primário: Membrana Celular/metabolismo
Chara/citologia
Chara/metabolismo
Citoplasma/metabolismo
[Mh] Termos MeSH secundário: Transporte Biológico
Clorofila/metabolismo
Fluorescência
Concentração de Íons de Hidrogênio
Microeletrodos
Fotossíntese
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
1406-65-1 (Chlorophyll)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:171012
[Lr] Data última revisão:
171012
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160420
[St] Status:MEDLINE
[do] DOI:10.1007/s00709-016-0975-x


  4 / 167 MEDLINE  
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[PMID]:27549231
[Au] Autor:Pukacz A; Pelechaty M; Frankowski M
[Ad] Endereço:Polish-German Research Institute, Collegium Polonicum, Kosciuszki 1, 69-100, Slubice, Poland. pukacz@europa-uni.de.
[Ti] Título:Depth-dependence and monthly variability of charophyte biomass production: consequences for the precipitation of calcium carbonate in a shallow Chara-lake.
[So] Source:Environ Sci Pollut Res Int;23(22):22433-22442, 2016 Nov.
[Is] ISSN:1614-7499
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The month-to-month variability of biomass and CaCO precipitation by dense charophyte beds was studied in a shallow Chara-lake at two depths, 1 and 3 m. Charophyte dry weights (d.w.), the percentage contribution of calcium carbonate to the dry weight and the precipitation of CaCO per 1 m were analysed from May to October 2011. Physical-chemical parameters of water were also measured for the same sample locations. The mean dry weight and calcium carbonate precipitation were significantly higher at 1 m than at 3 m. The highest measured charophyte dry weight (exceeding 2000 g m ) was noted at 1 m depth in September, and the highest CaCO content in the d.w. (exceeding 80 % of d.w.) was observed at 3 m depth in August. The highest CaCO precipitation per 1 m exceeded 1695 g at 1 m depth in August. Significant differences in photosynthetically active radiation (PAR) were found between 1 and 3 m depths; there were no significant differences between depths for other water properties. At both sampling depths, there were distinct correlations between the d.w., CaCO content and precipitation and water properties. In addition to PAR, the water temperature and magnesium and calcium ion concentrations were among the most significant determinants of CaCO content and d.w. The results show that light availability seems to be the major factor in determining charophyte biomass in a typical, undisturbed Chara-lake. The study results are discussed in light of the role of charophyte vegetation in whole ecosystem functioning, with a particular focus on sedimentary processes and the biogeochemical cycle within the littoral zone.
[Mh] Termos MeSH primário: Carbonato de Cálcio/química
Chara/fisiologia
Lagos/química
[Mh] Termos MeSH secundário: Biomassa
Precipitação Química
Ecossistema
Água/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
059QF0KO0R (Water); H0G9379FGK (Calcium Carbonate)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160824
[St] Status:MEDLINE


  5 / 167 MEDLINE  
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[PMID]:27208645
[Au] Autor:Grung M; Ruus A; Schneider SC; Hjermann DØ; Borgå K
[Ad] Endereço:Norwegian Institute for Water Research, Gaustadalléen 21, 0349 Oslo, Norway. Electronic address: mgr@niva.no.
[Ti] Título:Toxicokinetics of pyrene in the freshwater alga Chara rudis.
[So] Source:Chemosphere;157:49-56, 2016 Aug.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Chara has been suggested a good model to study uptake of xenobiotics into cytoplasm due to their large internode cells surrounded by a layer of cortex cells. We studied the uptake and elimination of pyrene (nominal concentration of 5 µg L(-1)) in the freshwater alga Chara rudis during 22 days in two treatments mimicking epilimnetic (warm and light) and hypolimnetic (cold and dark) conditions. The growth of Chara during the exposure was higher in epilimnetic conditions (40%) compared to both hypolimnetic pyrene exposed Chara and controls (epilimnetic and hypolimnetic, no pyrene). In the water, a more rapid dissipation of pyrene was observed in epilimnetic conditions, possibly as a result of the increased algal growth. In the cortex, pyrene, 1-OH-pyrene (minor metabolite) and an unknown hydrophobic major metabolite was measured. Pyrene amounts decreased over time, while amounts of the unknown metabolite increased. In internode cytoplasm, pyrene and 1-OH-pyrene showed initially increasing followed by decreasing trends, while the unknown metabolite was not detected. The total mass balance showed that we were able to account for the applied pyrene until 4 days of exposure. However, after this time, there was a significant decrease in amounts accounted for by fluorescence, suggesting that the metabolism of pyrene involves degradation of the ring structure. The degradation was larger in epilimnetic than hypolimnetic conditions.
[Mh] Termos MeSH primário: Biodegradação Ambiental/efeitos da radiação
Chara/metabolismo
Pirenos/farmacocinética
Toxicocinética
[Mh] Termos MeSH secundário: Chara/crescimento & desenvolvimento
Água Doce
Temperatura Alta
Luz
Pirenos/metabolismo
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Pyrenes); 9E0T7WFW93 (pyrene)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160522
[St] Status:MEDLINE


  6 / 167 MEDLINE  
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[PMID]:27068826
[Au] Autor:Zabka A; Polit JT; Winnicki K; Paciorek P; Juszczak J; Nowak M; Maszewski J
[Ad] Endereço:Department of Cytophysiology, Faculty of Biology and Environmental Protection, University of Lódz, Pomorska 141/143, 90-236, Lodz, Poland.
[Ti] Título:PIN2-like proteins may contribute to the regulation of morphogenetic processes during spermatogenesis in Chara vulgaris.
[So] Source:Plant Cell Rep;35(8):1655-69, 2016 Aug.
[Is] ISSN:1432-203X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:KEY MESSAGE: PIN2-like auxin transporters are expressed, preferentially in a polarized manner, in antheridial cells of freshwater green alga Chara vulgaris , considered to be the closest relative of the present-day land plants. Chara vulgaris represents a group of advanced multicellular green algae that are considered as the closest relatives of the present-day land plants. A highly specialized structure of its male sex organs (antheridia) includes filaments consisting of generative cells, which after a series of synchronous divisions transform into mature sperm, and non-generative cells comprising outer shield cells, cylindrical manubria, and central complex of capitular cells from which antheridial filaments arise. Immunofluorescence observations indicate that PIN2-like proteins (PIN2-LPs), recognized by antibodies against PIN-FORMED2 (PIN2) auxin transporter in Arabidopsis thaliana, are expressed in both types of antheridial cells and, in most of them, preferentially accumulate in a polarized manner. The appearance of PIN2-LPs in germ-line cells is strictly confined to the proliferative period of spermatogenesis and their quantities increase steadily till antheridial filaments reach the 16-celled stage. An enhanced level of PIN2-LPs observed in the central cell walls separating two asynchronously developing parts of antheridial filaments (characterized by the plugged plasmodesmata) is correlated with an enhanced deposition of callose. Intense PIN2-LPs immunofluorescence maintained in the capitular cells and its altering polarity in manubria suggest a pivotal role of these cells in the regulation of auxin transport directionality during the whole time of antheridial ontogenesis. Immunohistochemical staining of IAA revealed a clear-cut correspondence between localization sites of auxins and PIN2-LPs. It seems probable then that a supplementary developmental mechanism has evolved in Chara, by which all antheridial elements may be integrated at the supra-cellular level via plasma membrane-targeted PIN2-LPs and auxin-mediated processes.
[Mh] Termos MeSH primário: Proteínas de Algas/metabolismo
Chara/metabolismo
Gametogênese
Morfogênese
[Mh] Termos MeSH secundário: Parede Celular/metabolismo
Chara/citologia
Imunofluorescência
Ácidos Indolacéticos/metabolismo
Modelos Biológicos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Algal Proteins); 0 (Indoleacetic Acids)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170327
[Lr] Data última revisão:
170327
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160413
[St] Status:MEDLINE
[do] DOI:10.1007/s00299-016-1979-x


  7 / 167 MEDLINE  
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[PMID]:26943501
[Au] Autor:Zhang S; de Boer AH; van Duijn B
[Ad] Endereço:Plant Biodynamics Laboratory, Institute Biology Leiden, Leiden University, Sylvius Laboratory, Sylviusweg 72, 2333 BE Leiden, The Netherlands.
[Ti] Título:Auxin effects on ion transport in Chara corallina.
[So] Source:J Plant Physiol;193:37-44, 2016 Apr 01.
[Is] ISSN:1618-1328
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The plant hormone auxin has been widely studied with regard to synthesis, transport, signaling and functions among the land plants while there is still a lack of knowledge about the possible role for auxin regulation mechanisms in algae with "plant-like" structures. Here we use the alga Chara corallina as a model to study aspects of auxin signaling. In this respect we measured auxin on membrane potential changes and different ion fluxes (K(+), H(+)) through the plasma membrane. Results showed that auxin, mainly IAA, could hyperpolarize the membrane potential of C. corallina internodal cells. Ion flux measurements showed that the auxin-induced membrane potential change may be based on the change of K(+) permeability and/or channel activity rather than through the activation of proton pumps as known in land plants.
[Mh] Termos MeSH primário: Chara/fisiologia
Ácidos Indolacéticos/farmacologia
Transporte de Íons
Reguladores de Crescimento de Planta/farmacologia
Transdução de Sinais/efeitos dos fármacos
[Mh] Termos MeSH secundário: Membrana Celular/efeitos dos fármacos
Membrana Celular/metabolismo
Chara/efeitos dos fármacos
Potenciais da Membrana/efeitos dos fármacos
Potássio/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Indoleacetic Acids); 0 (Plant Growth Regulators); RWP5GA015D (Potassium)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170117
[Lr] Data última revisão:
170117
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160305
[St] Status:MEDLINE


  8 / 167 MEDLINE  
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[PMID]:26774747
[Au] Autor:Wojtczak A
[Ad] Endereço:Department of Cytophysiology, Faculty of Biology and Environmental Protection, University of Lódz, Pomorska 141/143, 90-236 Lódz, Poland. Electronic address: wojag@biol.uni.lodz.pl.
[Ti] Título:Immunocytochemical and immunogold analyses of histone H4 acetylation during Chara vulgaris spermiogenesis.
[So] Source:Micron;82:86-93, 2016 Mar.
[Is] ISSN:1878-4291
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Histone acetylation is one of the epigenetic modifications which play a significant role in chromatin remodeling during spermiogenesis. Acetylation of the histone H4 makes the exchange of nucleoproteins easy. Research on mouse spermatogenesis showed that H4 histone acetylated at Lys 12 (H4K12ac) was specific only to spermatids. Immunocytochemical studies of Chara vulgaris spermatids with the use of antibodies against the histone H4K12ac revealed positive reactions in spermatid nuclei at stages I-VII. This reaction, connected with nuclear condensation, was much stronger at the early stages of spermiogenesis than later on. Moreover, it showed that at the stages V-VII in spermatid nuclei the presence of the histone H4K12ac corresponded with DNA double-strand breaks. Electron microscopy studies with the use of immunogold technique revealed an almost twofold difference between the mean total numbers of gold grains in the examined chromatin in both stages. This study showed nearly equal distribution of gold grains on condensed and non-condensed chromatin of spermatids at the stage III/IV (48.11% and 51.89%, respectively). In the later stage-VI, when chromatin condensation proceeded, labeling of condensed chromatin reached 57.27%, while in the case of non-condensed chromatin it dropped to 42.73%. The percentage analysis also revealed an increase (above 9%) in condensed chromatin labeling in relation to the stage III/IV. Intensive acetylation of histone H4 at the early stages is correlated with DNA DSBs and transcriptional activity. It facilitates chromatin loosening, which enables the correct course of chromatin remodeling at a later stage. Histone γH2AX also influences chromatin structure in many biological processes in different cell types. Current studies reveal other similarities regarding histone H4 acetylation, not only between Chara and mammals but between invertebrates (molluscs) and vertebrates (bony fishes) as well.
[Mh] Termos MeSH primário: Núcleo Celular/metabolismo
Núcleo Celular/ultraestrutura
Chara/fisiologia
Chara/ultraestrutura
Cromatina/ultraestrutura
Gametogênese Vegetal
Histonas/metabolismo
[Mh] Termos MeSH secundário: Acetilação
Núcleo Celular/genética
Chara/metabolismo
Cromatina/genética
Montagem e Desmontagem da Cromatina
Heterocromatina/ultraestrutura
Histonas/química
Histonas/genética
Imuno-Histoquímica
Proteínas Nucleares/genética
Proteínas Nucleares/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Chromatin); 0 (Heterochromatin); 0 (Histones); 0 (Nuclear Proteins)
[Em] Mês de entrada:1611
[Cu] Atualização por classe:170915
[Lr] Data última revisão:
170915
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160118
[St] Status:MEDLINE


  9 / 167 MEDLINE  
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[PMID]:25874591
[Au] Autor:Fillafer C; Schneider MF
[Ad] Endereço:Biological Physics Group, Department of Mechanical Engineering, Boston University, 110 Cummington St., Boston, MA, 02215, USA. christian.fillafer@gmail.com.
[Ti] Título:On the excitation of action potentials by protons and its potential implications for cholinergic transmission.
[So] Source:Protoplasma;253(2):357-65, 2016 Mar.
[Is] ISSN:1615-6102
[Cp] País de publicação:Austria
[La] Idioma:eng
[Ab] Resumo:One of the most conserved mechanisms for transmission of a nerve pulse across a synapse relies on acetylcholine (ACh). Ever since the Nobel Prize-winning works of Dale and Loewi, it has been assumed that ACh-subsequent to its action on a postsynaptic cell-is split into inactive by-products by acetylcholinesterase (AChE). Herein, the widespread assumption of inactivity of ACh's hydrolysis products is falsified. Excitable cells (Chara braunii internodes), which had previously been unresponsive to ACh, became ACh-sensitive in the presence of AChE. The latter was evidenced by a striking difference in cell membrane depolarization upon exposure to 10 mM intact ACh (∆V = -2 ± 5 mV) and its hydrolysate (∆V = 81 ± 19 mV), respectively, for 60 s. This pronounced depolarization, which also triggered action potentials, was clearly attributed to one of the hydrolysis products: acetic acid (∆V = 87 ± 9 mV at pH 4.0; choline ineffective in the range 1-10 mM). In agreement with our findings, numerous studies in the literature have reported that acids excite gels, lipid membranes, plant cells, erythrocytes, as well as neurons. Whether excitation of the postsynaptic cell in a cholinergic synapse is due to protons or due to intact ACh is a most fundamental question that has not been addressed so far.
[Mh] Termos MeSH primário: Acetilcolina/farmacologia
Potenciais de Ação/efeitos dos fármacos
Agonistas Colinérgicos/farmacologia
[Mh] Termos MeSH secundário: Acetilcolina/química
Acetilcolinesterase/química
Animais
Células Cultivadas
Chara/citologia
Agonistas Colinérgicos/química
Electrophorus
Proteínas de Peixes/química
Concentração de Íons de Hidrogênio
Hidrólise
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Cholinergic Agonists); 0 (Fish Proteins); EC 3.1.1.7 (Acetylcholinesterase); N9YNS0M02X (Acetylcholine)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:171012
[Lr] Data última revisão:
171012
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150416
[St] Status:MEDLINE
[do] DOI:10.1007/s00709-015-0815-4


  10 / 167 MEDLINE  
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[PMID]:26382914
[Au] Autor:Beilby MJ; Turi CE; Baker TC; Tymm FJ; Murch SJ
[Ad] Endereço:a School of Physics; University of NSW ; Sydney , Australia.
[Ti] Título:Circadian changes in endogenous concentrations of indole-3-acetic acid, melatonin, serotonin, abscisic acid and jasmonic acid in Characeae (Chara australis Brown).
[So] Source:Plant Signal Behav;10(11):e1082697, 2015.
[Is] ISSN:1559-2324
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Giant-celled Characeae (Chara australis Brown), grown for 4 months on 12/12 hr day/night cycle and summer/autumn temperatures, exhibited distinct concentration maxima in auxin (indole-3-acetic acid; IAA), melatonin and serotonin about 4 hr after subjective daybreak. These concentration peaks persisted after 3 day pretreatment in continuous darkness: confirming a circadian rhythm, rather than a response to "light on." The plants pretreated for 3 d in continuous light exhibited several large IAA concentration maxima throughout the 24 hr. The melatonin and serotonin concentrations decreased and were less synchronized with IAA. Chara plants grown on 9/15 hr day/night cycle for 4 months and winter/spring temperatures contained much smaller concentrations of IAA, melatonin and serotonin. The IAA concentration maxima were observed in subjective dark phase. Serotonin concentration peaks were weakly correlated with those of IAA. Melatonin concentration was low and mostly independent of circadian cycle. The "dark" IAA concentration peaks persisted in plants treated for 3 d in the dark. The plants pretreated for 3 d in the light again developed more IAA concentration peaks. In this case the concentration maxima in melatonin and serotonin became more synchronous with those in IAA. The abscisic acid (ABA) and jasmonic acid (JA) concentrations were also measured in plants on winter regime. The ABA concentration did not exhibit circadian pattern, while JA concentration peaks were out of phase with those of IAA. The data are discussed in terms of crosstalk between metabolic pathways.
[Mh] Termos MeSH primário: Ácido Abscísico/metabolismo
Chara/metabolismo
Ritmo Circadiano
Ciclopentanos/metabolismo
Ácidos Indolacéticos/metabolismo
Melatonina/metabolismo
Oxilipinas/metabolismo
Serotonina/metabolismo
[Mh] Termos MeSH secundário: Aclimatação
Espectrometria de Massas
Fotoperíodo
Estações do Ano
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cyclopentanes); 0 (Indoleacetic Acids); 0 (Oxylipins); 333DO1RDJY (Serotonin); 6RI5N05OWW (jasmonic acid); 6U1S09C61L (indoleacetic acid); 72S9A8J5GW (Abscisic Acid); JL5DK93RCL (Melatonin)
[Em] Mês de entrada:1609
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150919
[St] Status:MEDLINE
[do] DOI:10.1080/15592324.2015.1082697



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