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[PMID]: 29045490 [Au] Autor: Liu W; Karemera NJU; Wu T; Yang Y; Zhang X; Xu X; Wang Y; Han Z [Ad] Endereço: Institute for Horticultural Plants, College of Horticulture, China Agricultural University, Beijing, China. [Ti] Título: The ethylene response factor AtERF4 negatively regulates the iron deficiency response in Arabidopsis thaliana. [So] Source: PLoS One;12(10):e0186580, 2017. [Is] ISSN: 1932-6203 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: Iron (Fe) deficiency is one of many conditions that can seriously damage crops. Low levels of photosynthesis can lead to the degradation of chlorophyll content and impaired respiration in affected plants, which together cause poor growth and reduce quality. Although ethylene plays an important role in responses to Fe deficiency, a limited number of studies have been carried out on ethylene response factor (ERFs) as components of plant regulation mechanisms. Thus, this study aimed to investigate the role of AtERF4 in plant responses to Fe deficiency. Results collected when Arabidopsis thaliana was grown under Fe deficient conditions as well as in the presence of 1-aminocyclopropane-1-carboxylic acid (ACC) revealed that leaf chlorosis did not occur over short timescales and that chloroplast structural integrity was retained. At the same time, expression of the chlorophyll degradation-related genes AtPAO and AtCLH1 was inhibited and net H+ root flux was amplified. Our results show that chlorophyll content was enhanced in the mutant erf4, while expression of the chlorophyll degradation gene AtCLH1 was reduced. Ferric reductase activity in roots was also significantly higher in the mutant than in wild type plants, while erf4 caused high levels of expression of the genes AtIRT1 and AtHA2 under Fe deficient conditions. We also utilized yeast one-hybrid technology in this study to determine that AtERF4 binds directly to the AtCLH1 and AtITR1 promoter. Observations show that transient over-expression of AtERF4 resulted in rapid chlorophyll degradation in the leaves of Nicotiana tabacum and the up-regulation of gene AtCLH1 expression. In summary, AtERF4 plays an important role as a negative regulator of Fe deficiency responses, we hypothesize that AtERF4 may exert a balancing effect on plants subject to nutrition stress. [Mh] Termos MeSH primário: Proteínas de Arabidopsis/metabolismo Arabidopsis/metabolismo Etilenos/metabolismo Ferro/deficiência Proteínas Repressoras/metabolismo [Mh] Termos MeSH secundário: Motivos de Aminoácidos Sequência de Aminoácidos Aminoácidos Cíclicos/farmacologia Arabidopsis/efeitos dos fármacos Arabidopsis/genética Proteínas de Arabidopsis/química Proteínas de Arabidopsis/genética Clorofila/metabolismo Etilenos/farmacologia Regulação da Expressão Gênica de Plantas/efeitos dos fármacos Genes de Plantas Glicina/análogos & derivados Glicina/farmacologia Modelos Biológicos Mutação/genética Fenótipo Raízes de Plantas/efeitos dos fármacos Raízes de Plantas/crescimento & desenvolvimento Raízes de Plantas/ultraestrutura Proteínas Repressoras/química Proteínas Repressoras/genética [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Amino Acids, Cyclic); 0 (Arabidopsis Proteins); 0 (ERF4 protein, Arabidopsis); 0 (Ethylenes); 0 (Repressor Proteins); 1406-65-1 (Chlorophyll); 3K9EJ633GL (1-aminocyclopropane-1-carboxylic acid); 91GW059KN7 (ethylene); E1UOL152H7 (Iron); OW5H814Y1I (aminoethoxyvinylglycine); TE7660XO1C (Glycine) [Em] Mês de entrada: 1710 [Cu] Atualização por classe: 171116 [Lr] Data última revisão: 171116 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 171019 [St] Status: MEDLINE [do] DOI: 10.1371/journal.pone.0186580

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[PMID]: 28991254 [Au] Autor: Teh BT; Lim K; Yong CH; Ng CCY; Rao SR; Rajasegaran V; Lim WK; Ong CK; Chan K; Cheng VKY; Soh PS; Swarup S; Rozen SG; Nagarajan N; Tan P [Ad] Endereço: Thorn Biosystems Pte Ltd, Singapore. [Ti] Título: The draft genome of tropical fruit durian (Durio zibethinus). [So] Source: Nat Genet;49(11):1633-1641, 2017 Nov. [Is] ISSN: 1546-1718 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: Durian (Durio zibethinus) is a Southeast Asian tropical plant known for its hefty, spine-covered fruit and sulfury and onion-like odor. Here we present a draft genome assembly of D. zibethinus, representing the third plant genus in the Malvales order and first in the Helicteroideae subfamily to be sequenced. Single-molecule sequencing and chromosome contact maps enabled assembly of the highly heterozygous durian genome at chromosome-scale resolution. Transcriptomic analysis showed upregulation of sulfur-, ethylene-, and lipid-related pathways in durian fruits. We observed paleopolyploidization events shared by durian and cotton and durian-specific gene expansions in MGL (methionine γ-lyase), associated with production of volatile sulfur compounds (VSCs). MGL and the ethylene-related gene ACS (aminocyclopropane-1-carboxylic acid synthase) were upregulated in fruits concomitantly with their downstream metabolites (VSCs and ethylene), suggesting a potential association between ethylene biosynthesis and methionine regeneration via the Yang cycle. The durian genome provides a resource for tropical fruit biology and agronomy. [Mh] Termos MeSH primário: Bombacaceae/genética Liases de Carbono-Enxofre/genética Frutas/genética Genoma de Planta Proteínas de Plantas/genética Transcriptoma [Mh] Termos MeSH secundário: Aminoácidos Cíclicos/biossíntese Bombacaceae/classificação Bombacaceae/crescimento & desenvolvimento Bombacaceae/metabolismo Liases de Carbono-Enxofre/metabolismo Mapeamento Cromossômico Frutas/crescimento & desenvolvimento Frutas/metabolismo Sequenciamento de Nucleotídeos em Larga Escala Ligases/genética Ligases/metabolismo Metabolismo dos Lipídeos/genética Filogenia Proteínas de Plantas/metabolismo Enxofre/metabolismo Compostos Orgânicos Voláteis/metabolismo [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Amino Acids, Cyclic); 0 (Plant Proteins); 0 (Volatile Organic Compounds); 3K9EJ633GL (1-aminocyclopropane-1-carboxylic acid); 70FD1KFU70 (Sulfur); EC 4.4.- (Carbon-Sulfur Lyases); EC 4.4.1.11 (L-methionine gamma-lyase); EC 6.- (Ligases) [Em] Mês de entrada: 1711 [Cu] Atualização por classe: 171102 [Lr] Data última revisão: 171102 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 171010 [St] Status: MEDLINE [do] DOI: 10.1038/ng.3972

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[PMID]: 28861701 [Au] Autor: Savada RP; Ozga JA; Jayasinghege CPA; Waduthanthri KD; Reinecke DM [Ad] Endereço: Plant BioSystems Division, Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture/Forestry Centre, University of Alberta, Edmonton, AB, T6G 2P5, Canada. [Ti] Título: Heat stress differentially modifies ethylene biosynthesis and signaling in pea floral and fruit tissues. [So] Source: Plant Mol Biol;95(3):313-331, 2017 Oct. [Is] ISSN: 1573-5028 [Cp] País de publicação: Netherlands [La] Idioma: eng [Ab] Resumo: KEY MESSAGE: Ethylene biosynthesis is regulated in reproductive tissues in response to heat stress in a manner to optimize resource allocation to pollinated fruits with developing seeds. High temperatures during reproductive development are particularly detrimental to crop fruit/seed production. Ethylene plays vital roles in plant development and abiotic stress responses; however, little is known about ethylene's role in reproductive tissues during development under heat stress. We assessed ethylene biosynthesis and signaling regulation within the reproductive and associated tissues of pea during the developmental phase that sets the stage for fruit-set and seed development under normal and heat-stress conditions. The transcript abundance profiles of PsACS [encode enzymes that convert S-adenosyl-L-methionine to 1-aminocyclopropane-1-carboxylic acid (ACC)] and PsACO (encode enzymes that convert ACC to ethylene), and ethylene evolution were developmentally, environmentally, and tissue-specifically regulated in the floral/fruit/pedicel tissues of pea. Higher transcript abundance of PsACS and PsACO in the ovaries, and PsACO in the pedicels was correlated with higher ethylene evolution and ovary senescence and pedicel abscission in fruits that were not pollinated under control temperature conditions. Under heat-stress conditions, up-regulation of ethylene biosynthesis gene expression in pre-pollinated ovaries was also associated with higher ethylene evolution and lower retention of these fruits. Following successful pollination and ovule fertilization, heat-stress modified PsACS and PsACO transcript profiles in a manner that suppressed ovary ethylene evolution. The normal ethylene burst in the stigma/style and petals following pollination was also suppressed by heat-stress. Transcript abundance profiles of ethylene receptor and signaling-related genes acted as qualitative markers of tissue ethylene signaling events. These data support the hypothesis that ethylene biosynthesis is regulated in reproductive tissues in response to heat stress to modulate resource allocation dynamics. [Mh] Termos MeSH primário: Etilenos/biossíntese Flores/metabolismo Frutas/metabolismo Temperatura Alta Ervilhas/metabolismo Transdução de Sinais [Mh] Termos MeSH secundário: Aminoácidos Cíclicos/metabolismo Flores/genética Flores/crescimento & desenvolvimento Frutas/genética Frutas/crescimento & desenvolvimento Regulação da Expressão Gênica no Desenvolvimento Regulação da Expressão Gênica de Plantas Liases/genética Liases/metabolismo Ervilhas/genética Ervilhas/crescimento & desenvolvimento Proteínas de Plantas/genética Proteínas de Plantas/metabolismo Polinização/genética Reação em Cadeia da Polimerase Via Transcriptase Reversa Sementes/genética Sementes/crescimento & desenvolvimento Sementes/metabolismo Fatores de Tempo [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Amino Acids, Cyclic); 0 (Ethylenes); 0 (Plant Proteins); 3K9EJ633GL (1-aminocyclopropane-1-carboxylic acid); EC 4.- (Lyases); EC 4.4.1.14 (1-aminocyclopropanecarboxylate synthase) [Em] Mês de entrada: 1710 [Cu] Atualização por classe: 171030 [Lr] Data última revisão: 171030 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170902 [St] Status: MEDLINE [do] DOI: 10.1007/s11103-017-0653-1

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[PMID]: 28603971 [Au] Autor: Oba M; Kunitake M; Kato T; Ueda A; Tanaka M [Ad] Endereço: Graduate School of Biomedical Sciences, Nagasaki University , 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan. [Ti] Título: Enhanced and Prolonged Cell-Penetrating Abilities of Arginine-Rich Peptides by Introducing Cyclic α,α-Disubstituted α-Amino Acids with Stapling. [So] Source: Bioconjug Chem;28(7):1801-1806, 2017 Jul 19. [Is] ISSN: 1520-4812 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: Cell-penetrating peptides are receiving increasing attention as drug delivery tools, and the search for peptides with high cell-penetrating ability and negligible cytotoxicity has become a critical research topic. Herein, cyclic α,α-disubstituted α-amino acids were introduced into arginine-rich peptides and an additional staple was provided in the side chain. The peptides designed in the present study showed more enhanced and prolonged cell-penetrating abilities than an arginine nonapeptide due to high resistance to protease and conformationally stable helical structures. [Mh] Termos MeSH primário: Aminoácidos Cíclicos Arginina Peptídeos Penetradores de Células/síntese química Sistemas de Liberação de Medicamentos/métodos Peptídeos/química [Mh] Termos MeSH secundário: Peptídeos Penetradores de Células/química Desenho de Drogas Estabilidade de Medicamentos Células HeLa Seres Humanos Relação Estrutura-Atividade [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Amino Acids, Cyclic); 0 (Cell-Penetrating Peptides); 0 (Peptides); 94ZLA3W45F (Arginine) [Em] Mês de entrada: 1708 [Cu] Atualização por classe: 170817 [Lr] Data última revisão: 170817 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170613 [St] Status: MEDLINE [do] DOI: 10.1021/acs.bioconjchem.7b00190

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[PMID]: 28242415 [Au] Autor: Serova TA; Tikhonovich IA; Tsyganov VE [Ad] Endereço: All-Russia Research Institute for Agricultural Microbiology, Laboratory of Molecular and Cellular Biology, Podbelsky chaussee 3, 196608, Pushkin 8, Saint-Petersburg, Russia. [Ti] Título: Analysis of nodule senescence in pea (Pisum sativum L.) using laser microdissection, real-time PCR, and ACC immunolocalization. [So] Source: J Plant Physiol;212:29-44, 2017 May. [Is] ISSN: 1618-1328 [Cp] País de publicação: Germany [La] Idioma: eng [Ab] Resumo: A delay in the senescence of symbiotic nodules could prolong active nitrogen fixation, resulting in improved crop yield and a reduced need for chemical fertilizers. The molecular genetic mechanisms underlying nodule senescence have not been extensively studied with a view to breeding varieties with delayed nodule senescence. In such studies, plant mutants with the phenotype of premature degradation of symbiotic structures are useful models to elucidate the genetic basis of nodule senescence. Using a dataset from transcriptome analysis of Medicago truncatula Gaertn. nodules and previous studies on pea (Pisum sativum L.) nodules, we developed a set of molecular markers based on genes that are known to be activated during nodule senescence. These genes encode cysteine proteases, a thiol protease, a bZIP transcription factor, enzymes involved in the biosynthesis of ethylene (ACS2 for ACC synthase and ACO1 for ACC oxidase) and ABA (AO3 for aldehyde oxidase), and an enzyme involved in catabolism of gibberellins (GA 2-oxidase). We analyzed the transcript levels of these genes in the nodules of two pea wild-types (cv. Sparkle and line Sprint-2) and two mutant lines, one showing premature nodule senescence (E135F (sym13)) and one showing no morphological signs of symbiotic structure degradation (Sprint-2Fix (sym31)). Real-time PCR analyses revealed that all of the selected genes showed increased transcript levels during nodule aging in all phenotypes. Remarkably, at 4 weeks after inoculation (WAI), the transcript levels of all analyzed genes were significantly higher in the early senescent nodules of the mutant line E135F (sym13) and in nodules of the mutant Sprint-2Fix (sym31) than in the active nitrogen-fixing nodules of wild-types. In contrast, the transcript levels of the same genes of both wild-types were significantly increased only at 6 WAI. We evaluated the expression of selected markers in the different histological nodule zones of pea cv. Sparkle and its mutant line E135F (sym13) by laser capture microdissection analysis. Finally, we analyzed ACC by immunolocalization in the nodules of both wild-type pea and their mutants. Together, the results indicate that nodule senescence is a general plant response to nodule ineffectiveness. [Mh] Termos MeSH primário: Envelhecimento/genética Marcadores Genéticos/genética Microdissecção/métodos Ervilhas/genética Proteínas de Plantas/genética Reação em Cadeia da Polimerase em Tempo Real/métodos Nódulos Radiculares de Plantas/genética [Mh] Termos MeSH secundário: Ácido Abscísico/metabolismo Aldeído Oxidase/genética Aminoácido Oxirredutases/genética Aminoácidos Cíclicos/análise Cisteína Proteases/genética DNA de Plantas/genética Etilenos/biossíntese Perfilação da Expressão Gênica/métodos Regulação da Expressão Gênica de Plantas Genes de Plantas/genética Giberelinas/genética Liases/genética Medicago truncatula/microbiologia Oxigenases de Função Mista/genética Mutação Fixação de Nitrogênio/genética Ervilhas/microbiologia Peptídeo Hidrolases/genética Fenótipo Reguladores de Crescimento de Planta/análise Reguladores de Crescimento de Planta/genética Raízes de Plantas/metabolismo RNA Mensageiro/análise RNA de Plantas Rhizobium/genética Nódulos Radiculares de Plantas/citologia Nódulos Radiculares de Plantas/metabolismo Simbiose/genética [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Amino Acids, Cyclic); 0 (DNA, Plant); 0 (Ethylenes); 0 (Genetic Markers); 0 (Gibberellins); 0 (Plant Growth Regulators); 0 (Plant Proteins); 0 (RNA, Messenger); 0 (RNA, Plant); 3K9EJ633GL (1-aminocyclopropane-1-carboxylic acid); 72S9A8J5GW (Abscisic Acid); 91GW059KN7 (ethylene); EC 1.- (Mixed Function Oxygenases); EC 1.14.11.13 (gibberellin 2-dioxygenase); EC 1.2.3.1 (Aldehyde Oxidase); EC 1.4.- (Amino Acid Oxidoreductases); EC 1.4.3.- (1-aminocyclopropane-1-carboxylic acid oxidase); EC 3.4.- (Cysteine Proteases); EC 3.4.- (Peptide Hydrolases); EC 4.- (Lyases); EC 4.4.1.14 (1-aminocyclopropanecarboxylate synthase) [Em] Mês de entrada: 1710 [Cu] Atualização por classe: 171017 [Lr] Data última revisão: 171017 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170301 [St] Status: MEDLINE

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[PMID]: 28186676 [Au] Autor: Barnawal D; Pandey SS; Bharti N; Pandey A; Ray T; Singh S; Chanotiya CS; Kalra A [Ad] Endereço: Microbial Technology Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, Uttar Pradesh, India. [Ti] Título: ACC deaminase-containing plant growth-promoting rhizobacteria protect Papaver somniferum from downy mildew. [So] Source: J Appl Microbiol;122(5):1286-1298, 2017 May. [Is] ISSN: 1365-2672 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: AIMS: The aim of this study was to determine whether ACC (1-aminocyclopropane-1-carboxylic acid) deaminase-containing bacterial treatments could enhance the tolerance of poppy (Papaver somniferum L.) plants against biotic stress of downy mildew caused by Peronospora sp. METHODS AND RESULTS: Three different genotypes of P. somniferum, that is, Sampada, J-16 and I-14 were included in the experiment. The ACC deaminase-containing bacteria Pseudomonas putida (WPTe) reduced the downy mildew disease severity and significantly improved the growth and yield of P. somniferum plants. The chlorophyll content, photosynthetic rate, stomatal conductance and transpiration rate were modulated upon WPTe treatments in the poppy plants. We observed reduced synthesis of ethylene precursor (ACC) and abscisic acid (ABA), and enhanced production of indole acetic acid (IAA) in P. somniferum plants upon WPTe treatments. Moreover, WPTe treatment reduced proline and lipid peroxidation in plant leaves. CONCLUSION: These results highlight that the ACC deaminase-containing plant growth-promoting rhizobacteria (PGPR) enhance the tolerance of P. somniferum plant against downy mildew. SIGNIFICANCE AND IMPACT OF THE STUDY: ACC deaminase-containing PGPR may be used against phytopathogens which apart from protecting the plants from the disease could also be useful in reducing ethylene-induced damages in the event of abiotic stresses. [Mh] Termos MeSH primário: Carbono-Carbono Liases/metabolismo Papaver/microbiologia Peronospora/fisiologia Doenças das Plantas/prevenção & controle Pseudomonas putida/enzimologia [Mh] Termos MeSH secundário: Aminoácidos Cíclicos Carbono-Carbono Liases/genética Clorofila/metabolismo Papaver/crescimento & desenvolvimento Papaver/metabolismo Peronospora/genética Fotossíntese Doenças das Plantas/microbiologia Folhas de Planta/crescimento & desenvolvimento Folhas de Planta/metabolismo Folhas de Planta/microbiologia Pseudomonas putida/genética Pseudomonas putida/isolamento & purificação Microbiologia do Solo [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Amino Acids, Cyclic); 1406-65-1 (Chlorophyll); 3K9EJ633GL (1-aminocyclopropane-1-carboxylic acid); EC 3.5.99.7 (1-aminocyclopropane-1-carboxylate deaminase); EC 4.1.- (Carbon-Carbon Lyases) [Em] Mês de entrada: 1707 [Cu] Atualização por classe: 170703 [Lr] Data última revisão: 170703 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170211 [St] Status: MEDLINE [do] DOI: 10.1111/jam.13417

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[PMID]: 28171801 [Au] Autor: Zhai X; Zhang Y; Kai W; Liang B; Jiang L; Du Y; Wang J; Sun Y; Leng P [Ad] Endereço: College of Horticulture, China Agricultural University, Beijing 100193, PR China. [Ti] Título: Variable responses of two VlMYBA gene promoters to ABA and ACC in Kyoho grape berries. [So] Source: J Plant Physiol;211:81-89, 2017 Apr. [Is] ISSN: 1618-1328 [Cp] País de publicação: Germany [La] Idioma: eng [Ab] Resumo: The VlMYBA subfamily of transcription factors has been known to be the functional regulators in anthocyanin biosynthesis in red grapes. In this study, the expressions of the VlMYBA1-2 and VlMYBA 2 genes, and the responses of the VlMYBA1-2/2 promoters to ABA and ACC treatments in Kyoho grape berries are examined through quantitative real-time PCR analysis and the transient expression assay. The results show that the expressions of VlMYBA1-2/2 increase dramatically after véraison and reach their highest levels when the berries are nearly fully ripe. Exogenous ABA promotes the expressions of VlMYBA1-2/2, whereas the ACC treatment increases the expression of VlMYBA2, however, it has no effect on VlMYBA1-2. The ABA treatment has a faster and stronger effect on berry pigmentation than ACC does. The VlMYBA1-2 promoter sequence contains two ABA response elements (ABRE) but no ethylene response element (ERE), whereas the VlMYBA2 promoter sequence contains two ABRE and one ERE in the upstream region of the start codon. The VlMYBA2 promoter can be activated by both ABA (more effective) and ACC, whereas the VlMYBA1-2 promoter can be activated by ABA only. In sum, ABA can promote the coloring of Kyoho grape by the promotion of VlMYBA1-2/2 transcriptions via activating the response of their promoters to ABA, whereas ethylene only regulates VlMYBA2 through the response activation of its promoter to ACC which partially enhances the coloring. [Mh] Termos MeSH primário: Ácido Abscísico/farmacologia Aminoácidos Cíclicos/farmacologia Frutas/genética Proteínas de Plantas/genética Regiões Promotoras Genéticas/genética Vitis/genética [Mh] Termos MeSH secundário: Antocianinas/metabolismo Sequência de Bases Frutas/efeitos dos fármacos Frutas/crescimento & desenvolvimento Regulação da Expressão Gênica de Plantas/efeitos dos fármacos Genes de Plantas Fenóis/farmacologia Proteínas de Plantas/metabolismo Alinhamento de Sequência Vitis/efeitos dos fármacos Vitis/crescimento & desenvolvimento [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Amino Acids, Cyclic); 0 (Anthocyanins); 0 (Phenols); 0 (Plant Proteins); 3K9EJ633GL (1-aminocyclopropane-1-carboxylic acid); 72S9A8J5GW (Abscisic Acid) [Em] Mês de entrada: 1706 [Cu] Atualização por classe: 170626 [Lr] Data última revisão: 170626 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170208 [St] Status: MEDLINE

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[PMID]: 27923986 [Au] Autor: Lesniewska J; Öhman D; Krzeslowska M; Kushwah S; Barciszewska-Pacak M; Kleczkowski LA; Sundberg B; Moritz T; Mellerowicz EJ [Ad] Endereço: Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, S901-83 Umeå, Sweden (J.L., D.Ö., M.K., S.K., M.B.-P., B.S., T.M., E.J.M.); and Department of Plant Physiology, Umeå Plant Science Center, Umeå University, S901-87 Umeå, Sweden [Ti] Título: Defense Responses in Aspen with Altered Pectin Methylesterase Activity Reveal the Hormonal Inducers of Tyloses. [So] Source: Plant Physiol;173(2):1409-1419, 2017 Feb. [Is] ISSN: 1532-2548 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: Tyloses are ingrowths of parenchyma cells into the lumen of embolized xylem vessels, thereby protecting the remaining xylem from pathogens. They are found in heartwood, sapwood, and in abscission zones and can be induced by various stresses, but their molecular triggers are unknown. Here, we report that down-regulation of PECTIN METHYLESTERASE1 (PtxtPME1) in aspen (Populus tremula × tremuloides) triggers the formation of tyloses and activation of oxidative stress. We tested whether any of the oxidative stress-related hormones could induce tyloses in intact plantlets grown in sterile culture. Jasmonates, including jasmonic acid (JA) and methyl jasmonate, induced the formation of tyloses, whereas treatments with salicylic acid (SA) and 1-aminocyclopropane-1-carboxylic acid (ACC) were ineffective. SA abolished the induction of tyloses by JA, whereas ACC was synergistic with JA. The ability of ACC to stimulate tyloses formation when combined with JA depended on ethylene (ET) signaling, as shown by a decrease in the response in ET-insensitive plants. Measurements of internal ACC and JA concentrations in wild-type and ET-insensitive plants treated simultaneously with these two compounds indicated that ACC and JA regulate each other's concentration in an ET-dependent manner. The findings indicate that jasmonates acting synergistically with ethylene are the key molecular triggers of tyloses. [Mh] Termos MeSH primário: Hidrolases de Éster Carboxílico/metabolismo Celulose/análogos & derivados Populus/fisiologia [Mh] Termos MeSH secundário: Aminoácidos Cíclicos/metabolismo Aminoácidos Cíclicos/farmacologia Hidrolases de Éster Carboxílico/genética Celulose/metabolismo Ciclopentanos/metabolismo Etilenos/metabolismo Peróxido de Hidrogênio/metabolismo Oxilipinas/metabolismo Folhas de Planta/metabolismo Proteínas de Plantas/genética Proteínas de Plantas/metabolismo Plantas Geneticamente Modificadas Populus/efeitos dos fármacos Populus/genética Ácido Salicílico/metabolismo [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Amino Acids, Cyclic); 0 (Cyclopentanes); 0 (Ethylenes); 0 (Oxylipins); 0 (Plant Proteins); 0 (Tyloses); 3K9EJ633GL (1-aminocyclopropane-1-carboxylic acid); 6RI5N05OWW (jasmonic acid); 9004-34-6 (Cellulose); 91GW059KN7 (ethylene); BBX060AN9V (Hydrogen Peroxide); EC 3.1.1.- (Carboxylic Ester Hydrolases); EC 3.1.1.11 (pectinesterase); O414PZ4LPZ (Salicylic Acid) [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: 161208 [St] Status: MEDLINE [do] DOI: 10.1104/pp.16.01443

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[PMID]: 27765214 [Au] Autor: Zhu Z; Chen Y; Shi G; Zhang X [Ad] Endereço: Research Center for Bioengineering and Sensing Technology, University of Science & Technology Beijing, Beijing 100083, China. Electronic address: zhuzhu@ustb.edu.cn. [Ti] Título: Selenium delays tomato fruit ripening by inhibiting ethylene biosynthesis and enhancing the antioxidant defense system. [So] Source: Food Chem;219:179-184, 2017 Mar 15. [Is] ISSN: 0308-8146 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: The antioxidant activity of selenium (Se) detoxifies reactive oxygen species (ROS) in plants and animals. In the present study, we elucidated the mechanism underlying Se induced fruit development and ripening. Our study showed that foliar pretreatment with 1mgL sodium selenate effectively delayed fruit ripening and maintained fruit quality. Gene expression studies revealed that the repression of ethylene biosynthetic genes 1-aminocyclopropane-1-carboxylic acid (ACC) synthase and ACC oxidase decreased ethylene production and respiration rate. Moreover, Se treatment probably boosted the antioxidant defense system to reduce ROS generation and membrane damage. The enhanced antioxidative effect was attributed to higher glutathione content and increased activity of enzymes such as glutathione peroxidase and glutathione reductase. The upregulation of respiratory burst oxidase homologue genes in tomato fruit may also contribute to the enhanced antioxidative effect. Selenium treatment represents a promising strategy for delaying ripening and extending the shelf life of tomato fruit. [Mh] Termos MeSH primário: Regulação da Expressão Gênica de Plantas/efeitos dos fármacos Lycopersicon esculentum/efeitos dos fármacos Ácido Selênico/farmacologia [Mh] Termos MeSH secundário: Aminoácido Oxirredutases Aminoácidos Cíclicos Antioxidantes/farmacologia Etilenos/biossíntese Manipulação de Alimentos Frutas/crescimento & desenvolvimento Lycopersicon esculentum/enzimologia Lycopersicon esculentum/genética Lycopersicon esculentum/metabolismo Espécies Reativas de Oxigênio/metabolismo Compostos de Selênio/farmacologia [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Amino Acids, Cyclic); 0 (Antioxidants); 0 (Ethylenes); 0 (Reactive Oxygen Species); 0 (Selenium Compounds); 3K9EJ633GL (1-aminocyclopropane-1-carboxylic acid); 91GW059KN7 (ethylene); EC 1.4.- (Amino Acid Oxidoreductases); EC 1.4.3.- (1-aminocyclopropane-1-carboxylic acid oxidase); HV0Y51NC4J (Selenic Acid) [Em] Mês de entrada: 1612 [Cu] Atualização por classe: 161230 [Lr] Data última revisão: 161230 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 161022 [St] Status: MEDLINE

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[PMID]: 27827961 [Au] Autor: Wang X; Tan D; Ma J; Liang H; Zhang Q; Tan Y; Wang J; Luo W [Ad] Endereço: Laboratory Animal Center, Chongqing Medical University, Chongqing 400016, China. duomiaicha@163.com. [Ti] Título: Positive Regulation of Decidualization by l-Type Amino Acid Transporter 1 (lat1) in Pregnant Mice. [So] Source: Nutrients;8(11), 2016 Nov 05. [Is] ISSN: 2072-6643 [Cp] País de publicação: Switzerland [La] Idioma: eng [Ab] Resumo: Amino acids have an important role in the pre and post implantation of placenta and embryo development. l-type amino-acid transporter 1 (lat1) is responsible for the transportation of large neutral amino acids and is mainly expressed in human fetal liver, placenta, brain, etc. This study is the first to investigate the expression of lat1 in the early pregnancy of mouse uteri and its role in the process of decidualization. Endometrial stromal cells of a mouse model were used to evaluate decidualization from Day 4-8 of pregnancy in vitro followed by lat1 knock down by small interfering RNA and by a competitive inhibitor of Leucine transport 2-aminobicyclo-(2,2,1)-heptane-2-carboxylic acid (BCH). The effects of lat1 on decidualization in vivo were assessed by injecting BCH into the uterine horns. The mRNA and protein expressions of lat1 in the implantation sites were higher than that in the inter-implantation sites and were localized in the luminal and gland epithelium, stromal and decidual cells. Its increased expression ( < 0.05) was associated with artificial decidualization as well as activation of prl expression. Down-regulation of lat1 expression in these cells by siRNA and BCH inhibited the decidual progression in vitro. Inhibition of lat1 transportation by BCH controlled decidual progression in vivo also accompanied the down-regulation of prl, lat1 expression in the decidual area and embryo size on Day 8 of pregnancy. In conclusion, these results revealed that lat1 might play an important role in the decidual progression both in vitro and in vivo. [Mh] Termos MeSH primário: Sistema y+ de Transporte de Aminoácidos/fisiologia Decídua/fisiologia [Mh] Termos MeSH secundário: Sistema y+ de Transporte de Aminoácidos/antagonistas & inibidores Sistema y+ de Transporte de Aminoácidos/genética Aminoácidos Cíclicos/farmacologia Animais Transporte Biológico/efeitos dos fármacos Células Cultivadas Regulação para Baixo/efeitos dos fármacos Implantação do Embrião/fisiologia Desenvolvimento Embrionário/fisiologia Feminino Expressão Gênica Idade Gestacional Leucina/metabolismo Camundongos Gravidez RNA Mensageiro/análise RNA Interferente Pequeno/farmacologia Células Estromais Útero/metabolismo [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Amino Acid Transport System y+); 0 (Amino Acids, Cyclic); 0 (RNA, Messenger); 0 (RNA, Small Interfering); 0 (Slc7a7 protein, mouse); 20448-79-7 (2-aminobicyclo(2,2,1)heptane-2-carboxylic acid); GMW67QNF9C (Leucine) [Em] Mês de entrada: 1705 [Cu] Atualização por classe: 170525 [Lr] Data última revisão: 170525 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 161110 [St] Status: MEDLINE

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