Base de dados : MEDLINE
Pesquisa : A18.400.500.600 [Categoria DeCS]
Referências encontradas : 299 [refinar]
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[PMID]:27925507
[Au] Autor:Younas F; Aslam B; Muhammad F; Mohsin M; Raza A; Faisal MN; Hassan SU; Majeed W
[Ad] Endereço:a Institute of Pharmacy, Physiology and Pharmacology , University of Agriculture , Faisalabad , Pakistan.
[Ti] Título:Haematopoietic effects of Angelica sinensis root cap polysaccharides against lisinopril-induced anaemia in albino rats.
[So] Source:Pharm Biol;55(1):108-113, 2017 Dec.
[Is] ISSN:1744-5116
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:CONTEXT: Angelica sinensis L. (Umbelliferae) has medicinal properties. OBJECTIVES: The present study evaluates the haematopoietic effects of A. sinensis polysaccharides (ASP) against lisinopril-induced anaemia. MATERIALS AND METHODS: Thirty healthy adult male albino rats were randomly divided into five groups (n = 6). Group I was control group. Group II was treated with angiotensin-converting enzyme inhibitor (ACEI, 20 mg/kg/day) to induce anaemia. In group III, erythropoietin (EPO, 100 IU/kg/each) was administered in combination with ACEI. Group IV was treated with ASP (1 g/kg/day), extracted from A. sinensis root caps. In Group V, ASP (1 g/kg/day) was treated with ACEI. After 28 days, blood and tissue samples were collected for haematological and histopathological analysis, respectively. RESULTS: The results showed that ACEI significantly reduced the haemoglobin (Hb, 10.0 g/dL), packed cell volume (PCV, 39.5%), red blood cells (RBCs, 6.2 million/mm ), mean corpuscular volume (MCV, 53.5 fL) and mean corpuscular haemoglobin (MCH, 16.2 pg/cell) values. In the group treated with ASP, the Hb (13.7 g/dL) and RBCs (7.8 million/mm ) increased significantly (p < 0.05). The combination of ASP and ACEI led to the significant (p < 0.05) reduction in Hb (10.7 g/dL), PCV (33.3%), RBCs (6.0 million/mm ), MCV (54.42 fL) and MCH (16.44 pg/cell) values. While histopathological examination of the liver and kidney cells showed a mild degree of toxicity in the ASP-treated group. CONCLUSION: ASP has a potentiating effect on haematological parameters when given alone. However, when administered simultaneously with lisinopril, it showed an unfavourable effect with more complicated anaemia so it should not be used with ACEIs.
[Mh] Termos MeSH primário: Anemia/tratamento farmacológico
Angelica sinensis/química
Eritrócitos/efeitos dos fármacos
Hematínicos/farmacologia
Hematopoese/efeitos dos fármacos
Lisinopril
Extratos Vegetais/farmacologia
Coifa/química
Polissacarídeos/farmacologia
[Mh] Termos MeSH secundário: Anemia/sangue
Anemia/induzido quimicamente
Animais
Biomarcadores/sangue
Modelos Animais de Doenças
Índices de Eritrócitos
Eritrócitos/metabolismo
Eritropoetina/farmacologia
Hematínicos/isolamento & purificação
Hematínicos/toxicidade
Hematócrito
Hemoglobinas/metabolismo
Interações Ervas-Drogas
Masculino
Fitoterapia
Extratos Vegetais/isolamento & purificação
Extratos Vegetais/toxicidade
Plantas Medicinais
Polissacarídeos/isolamento & purificação
Polissacarídeos/toxicidade
Ratos Wistar
Fatores de Tempo
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Biomarkers); 0 (Hematinics); 0 (Hemoglobins); 0 (Plant Extracts); 0 (Polysaccharides); 11096-26-7 (Erythropoietin); E7199S1YWR (Lisinopril)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170309
[Lr] Data última revisão:
170309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161208
[St] Status:MEDLINE


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[PMID]:27649449
[Au] Autor:Möller BK; Xuan W; Beeckman T
[Ad] Endereço:Department of Plant Systems Biology, VIB, Technologiepark 927, B-9052 Ghent, Belgium; Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, B-9052 Ghent, Belgium.
[Ti] Título:Dynamic control of lateral root positioning.
[So] Source:Curr Opin Plant Biol;35:1-7, 2017 Feb.
[Is] ISSN:1879-0356
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In dicot root systems, lateral roots are in general regularly spaced along the longitudinal axis of the primary root to facilitate water and nutrient uptake. Recently, recurrent programmed cell death in the root cap of the growing root has been implicated in lateral root spacing. The root cap contains an auxin source that modulates lateral root patterning. Periodic release of auxin by dying root cap cells seems to trigger lateral root specification at regular intervals. However, it is currently unclear through which molecular mechanisms auxin restricts lateral root specification to specific cells along the longitudinal and radial axes of the root, or how environmental signals impact this process.
[Mh] Termos MeSH primário: Arabidopsis/crescimento & desenvolvimento
Raízes de Plantas/crescimento & desenvolvimento
Tropismo
[Mh] Termos MeSH secundário: Gravitropismo
Coifa/crescimento & desenvolvimento
Água/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
059QF0KO0R (Water)
[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:160921
[St] Status:MEDLINE


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[PMID]:27803060
[Au] Autor:Kamiya M; Higashio SY; Isomoto A; Kim JM; Seki M; Miyashima S; Nakajima K
[Ad] Endereço:Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
[Ti] Título:Control of root cap maturation and cell detachment by BEARSKIN transcription factors in Arabidopsis.
[So] Source:Development;143(21):4063-4072, 2016 11 01.
[Is] ISSN:1477-9129
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The root cap supports root growth by protecting the root meristem, sensing gravity and interacting with the rhizosphere through metabolite secretion and cell dispersal. Sustained root cap functions therefore rely on balanced proliferation of proximal stem cells and regulated detachment of distal mature cells. Although the gene regulatory network that governs stem cell activity in the root cap has been extensively studied in Arabidopsis, the mechanisms by which root cap cells mature and detach from the root tip are poorly understood. We performed a detailed expression analysis of three regulators of root cap differentiation, SOMBRERO, BEARSKIN1 and BEARSKIN2, and identified their downstream genes. Our results indicate that expression of BEARSKIN1 and BEARSKIN2 is associated with cell positioning on the root surface. We identified a glycosyl hydrolase 28 (GH28) family polygalacturonase (PG) gene as a direct target of BEARSKIN1. Overexpression and loss-of-function analyses demonstrated that the protein encoded by this PG gene facilitates cell detachment. We thus revealed a molecular link between the key regulators of root cap differentiation and the cellular events underlying root cap-specific functions.
[Mh] Termos MeSH primário: Arabidopsis
Diferenciação Celular/genética
Movimento Celular/genética
Coifa/crescimento & desenvolvimento
Fatores de Transcrição/fisiologia
[Mh] Termos MeSH secundário: Arabidopsis/genética
Arabidopsis/crescimento & desenvolvimento
Proteínas de Arabidopsis/genética
Proteínas de Arabidopsis/fisiologia
Regulação da Expressão Gênica de Plantas
Meristema/citologia
Meristema/crescimento & desenvolvimento
Meristema/metabolismo
Coifa/citologia
Raízes de Plantas/citologia
Raízes de Plantas/crescimento & desenvolvimento
Fatores de Transcrição/genética
Fatores de Transcrição/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Arabidopsis Proteins); 0 (Transcription Factors)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171125
[Lr] Data última revisão:
171125
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161103
[St] Status:MEDLINE


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[PMID]:27702994
[Au] Autor:Royer M; Cohen D; Aubry N; Vendramin V; Scalabrin S; Cattonaro F; Bogeat-Triboulot MB; Hummel I
[Ad] Endereço:UMR EEF, INRA, Université de Lorraine, 54280 Champenoux, France.
[Ti] Título:The build-up of osmotic stress responses within the growing root apex using kinematics and RNA-sequencing.
[So] Source:J Exp Bot;67(21):5961-5973, 2016 Nov.
[Is] ISSN:1460-2431
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Molecular regulation of growth must include spatial and temporal coupling of cell production and cell expansion. The underlying mechanisms, especially under environmental challenge, remain obscure. Spatial patterns of cell processes make the root apex well suited to deciphering stress signaling pathways, and to investigating both processes. Kinematics and RNA-sequencing were used to analyze the immediate growth response of hydroponically grown Populus nigra cuttings submitted to osmotic stress. About 7400 genes and unannotated transcriptionally active regions were differentially expressed between the division and elongation zones. Following the onset of stress, growth decreased sharply, probably due to mechanical effects, before recovering partially. Stress impaired cell expansion over the apex, progressively shortened the elongation zone, and reduced the cell production rate. Changes in gene expression revealed that growth reduction was mediated by a shift in hormone homeostasis. Osmotic stress rapidly elicited auxin, ethylene, and abscisic acid. When growth restabilized, transcriptome remodeling became complex and zone specific, with the deployment of hormone signaling cascades, transcriptional regulators, and stress-responsive genes. Most transcriptional regulations fit growth reduction, but stress also promoted expression of some growth effectors, including aquaporins and expansins Together, osmotic stress interfered with growth by activating regulatory proteins rather than by repressing the machinery of expansive growth.
[Mh] Termos MeSH primário: Pressão Osmótica/fisiologia
Coifa/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Arabidopsis/crescimento & desenvolvimento
Arabidopsis/metabolismo
Arabidopsis/fisiologia
Fenômenos Biomecânicos/fisiologia
Regulação da Expressão Gênica no Desenvolvimento/genética
Regulação da Expressão Gênica no Desenvolvimento/fisiologia
Regulação da Expressão Gênica de Plantas/genética
Regulação da Expressão Gênica de Plantas/fisiologia
Análise de Sequência com Séries de Oligonucleotídeos
Coifa/metabolismo
Coifa/fisiologia
Análise de Sequência de RNA
Transdução de Sinais/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171113
[Lr] Data última revisão:
171113
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161006
[St] Status:MEDLINE


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[PMID]:27307546
[Au] Autor:Suzuki H; Yokawa K; Nakano S; Yoshida Y; Fabrissin I; Okamoto T; Baluska F; Koshiba T
[Ad] Endereço:Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
[Ti] Título:Root cap-dependent gravitropic U-turn of maize root requires light-induced auxin biosynthesis via the YUC pathway in the root apex.
[So] Source:J Exp Bot;67(15):4581-91, 2016 Aug.
[Is] ISSN:1460-2431
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Gravitropism refers to the growth or movement of plants that is influenced by gravity. Roots exhibit positive gravitropism, and the root cap is thought to be the gravity-sensing site. In some plants, the root cap requires light irradiation for positive gravitropic responses. However, the mechanisms regulating this phenomenon are unknown. We herein report that maize roots exposed to white light continuously for ≥1-2h show increased indole-3-acetic acid (IAA) levels in the root tips, especially in the transition zone (1-3mm from the tip). Treatment with IAA biosynthesis inhibitors yucasin and l-kynurenine prevented any increases in IAA content and root curvature under light conditions. Analyses of the incorporation of a stable isotope label from tryptophan into IAA revealed that some of the IAA in roots was synthesized in the root apex. Furthermore, Zmvt2 and Zmyuc gene transcripts were detected in the root apex. One of the Zmyuc genes (ZM2G141383) was up-regulated by light irradiation in the 0-1mm tip region. Our findings suggest that IAA accumulation in the transition zone is due to light-induced activation of Zmyuc gene expression in the 0-1mm root apex region. Light-induced changes in IAA levels and distributions mediate the maize root gravitropic U-turn.
[Mh] Termos MeSH primário: Gravitropismo/fisiologia
Ácidos Indolacéticos/metabolismo
Meristema/fisiologia
Reguladores de Crescimento de Planta/fisiologia
Coifa/fisiologia
Zea mays/fisiologia
[Mh] Termos MeSH secundário: Regulação da Expressão Gênica de Plantas/fisiologia
Regulação da Expressão Gênica de Plantas/efeitos da radiação
Cinurenina/metabolismo
Cinurenina/fisiologia
Luz
Meristema/metabolismo
Redes e Vias Metabólicas/fisiologia
Reguladores de Crescimento de Planta/biossíntese
Reguladores de Crescimento de Planta/metabolismo
Coifa/metabolismo
Triazóis/metabolismo
Zea mays/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (5-(4-chlorophenyl)-4H-1,2,4-triazole-3-thiol); 0 (Indoleacetic Acids); 0 (Plant Growth Regulators); 0 (Triazoles); 343-65-7 (Kynurenine); 6U1S09C61L (indoleacetic acid)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160617
[St] Status:MEDLINE
[do] DOI:10.1093/jxb/erw232


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[PMID]:27050616
[Au] Autor:Kanno S; Arrighi JF; Chiarenza S; Bayle V; Berthomé R; Péret B; Javot H; Delannoy E; Marin E; Nakanishi TM; Thibaud MC; Nussaume L
[Ad] Endereço:Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo, Japan.
[Ti] Título:A novel role for the root cap in phosphate uptake and homeostasis.
[So] Source:Elife;5:e14577, 2016 Apr 06.
[Is] ISSN:2050-084X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The root cap has a fundamental role in sensing environmental cues as well as regulating root growth via altered meristem activity. Despite this well-established role in the control of developmental processes in roots, the root cap's function in nutrition remains obscure. Here, we uncover its role in phosphate nutrition by targeted cellular inactivation or phosphate transport complementation in Arabidopsis, using a transactivation strategy with an innovative high-resolution real-time (33)P imaging technique. Remarkably, the diminutive size of the root cap cells at the root-to-soil exchange surface accounts for a significant amount of the total seedling phosphate uptake (approximately 20%). This level of Pi absorption is sufficient for shoot biomass production (up to a 180% gain in soil), as well as repression of Pi starvation-induced genes. These results extend our understanding of this important tissue from its previously described roles in environmental perception to novel functions in mineral nutrition and homeostasis control.
[Mh] Termos MeSH primário: Arabidopsis/metabolismo
Homeostase
Fosfatos/metabolismo
Coifa/metabolismo
[Mh] Termos MeSH secundário: Imagem Óptica/métodos
Isótopos de Fósforo/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Phosphates); 0 (Phosphorus Isotopes)
[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:160407
[St] Status:MEDLINE


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[PMID]:26798015
[Au] Autor:Xuan W; Band LR; Kumpf RP; Van Damme D; Parizot B; De Rop G; Opdenacker D; Möller BK; Skorzinski N; Njo MF; De Rybel B; Audenaert D; Nowack MK; Vanneste S; Beeckman T
[Ad] Endereço:Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie (VIB), Technologiepark 927, 9052 Ghent, Belgium. Department of Plant Biotechnology and Bioinformatics, Gent University, Technologiepark 927, 9052 Ghent, Belgium. State Key Laboratory of Crop Genetics and Germplasm Enhancement
[Ti] Título:Cyclic programmed cell death stimulates hormone signaling and root development in Arabidopsis.
[So] Source:Science;351(6271):384-7, 2016 Jan 22.
[Is] ISSN:1095-9203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The plant root cap, surrounding the very tip of the growing root, perceives and transmits environmental signals to the inner root tissues. In Arabidopsis thaliana, auxin released by the root cap contributes to the regular spacing of lateral organs along the primary root axis. Here, we show that the periodicity of lateral organ induction is driven by recurrent programmed cell death at the most distal edge of the root cap. We suggest that synchronous bursts of cell death in lateral root cap cells release pulses of auxin to surrounding root tissues, establishing the pattern for lateral root formation. The dynamics of root cap turnover may therefore coordinate primary root growth with root branching in order to optimize the uptake of water and nutrients from the soil.
[Mh] Termos MeSH primário: Apoptose
Arabidopsis/crescimento & desenvolvimento
Ácidos Indolacéticos/metabolismo
Coifa/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Arabidopsis/citologia
Arabidopsis/metabolismo
Epiderme Vegetal/citologia
Epiderme Vegetal/crescimento & desenvolvimento
Epiderme Vegetal/metabolismo
Coifa/citologia
Coifa/metabolismo
Receptores do Ligante Indutor de Apoptose Relacionado a TNF/genética
Receptores do Ligante Indutor de Apoptose Relacionado a TNF/metabolismo
Transdução de Sinais
Solo
Água/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Indoleacetic Acids); 0 (Receptors, TNF-Related Apoptosis-Inducing Ligand); 0 (Soil); 059QF0KO0R (Water)
[Em] Mês de entrada:1602
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160123
[St] Status:MEDLINE
[do] DOI:10.1126/science.aad2776


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[PMID]:26068468
[Au] Autor:Kumpf RP; Nowack MK
[Ad] Endereço:Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie, B-9052 Ghent, Belgium Department of Plant Biotechnology and Bioinformatics, Ghent University, B-9052 Ghent, Belgium.
[Ti] Título:The root cap: a short story of life and death.
[So] Source:J Exp Bot;66(19):5651-62, 2015 Sep.
[Is] ISSN:1460-2431
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Over 130 years ago, Charles Darwin recognized that sensory functions in the root tip influence directional root growth. Modern plant biology has unravelled that many of the functions that Darwin attributed to the root tip are actually accomplished by a particular organ-the root cap. The root cap surrounds and protects the meristematic stem cells at the growing root tip. Due to this vanguard position, the root cap is predisposed to receive and transmit environmental information to the root proper. In contrast to other plant organs, the root cap shows a rapid turnover of short-lived cells regulated by an intricate balance of cell generation, differentiation, and degeneration. Thanks to these particular features, the root cap is an excellent developmental model system, in which generation, differentiation, and degeneration of cells can be investigated in a conveniently compact spatial and temporal frame. In this review, we give an overview of the current knowledge and concepts of root cap biology, focusing on the model plant Arabidopsis thaliana.
[Mh] Termos MeSH primário: Arabidopsis/fisiologia
Diferenciação Celular
Coifa/fisiologia
[Mh] Termos MeSH secundário: Arabidopsis/crescimento & desenvolvimento
Coifa/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; REVIEW
[Em] Mês de entrada:1607
[Cu] Atualização por classe:150912
[Lr] Data última revisão:
150912
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150613
[St] Status:MEDLINE
[do] DOI:10.1093/jxb/erv295


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[PMID]:25929794
[Au] Autor:Zhang Y; Kang E; Yuan M; Fu Y; Zhu L
[Ad] Endereço:State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing, 100193, China.
[Ti] Título:PCaP2 regulates nuclear positioning in growing Arabidopsis thaliana root hairs by modulating filamentous actin organization.
[So] Source:Plant Cell Rep;34(8):1317-30, 2015 Aug.
[Is] ISSN:1432-203X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:KEY MESSAGE: PCaP2 plays a key role in maintaining the nucleus at a relatively fixed distance from the apex during root hair growth by modulating actin filaments. During root hair growth, the nucleus localizes at a relatively fixed distance from the apex. In Arabidopsis thaliana, the position of the nucleus is mainly dependent on the configuration of microfilaments (filamentous actin). However, the mechanisms underlying the regulation of actin dynamics and organization for nuclear positioning are largely unknown. In the present study, we demonstrated that plasma membrane-associated Ca(2+) binding protein 2 (PCaP2) influences the position of the nucleus during root hair growth. Abnormal expression of PCaP2 in pcap2 and PCaP2 over-expression plants led to the disorganization of actin filaments, rather than microtubules, in the apex and sub-apical regions of root hairs, which resulted in aberrant root hair growth patterns and misplaced nuclei. Analyses using a PCaP2 mutant protein revealed that actin-severing activity is essential for the function of PCaP2 in root hairs. We demonstrated that PCaP2 plays a key role in maintaining nuclear position in growing root hairs by modulating actin filaments.
[Mh] Termos MeSH primário: Citoesqueleto de Actina/fisiologia
Proteínas de Arabidopsis/fisiologia
Arabidopsis/crescimento & desenvolvimento
Núcleo Celular/fisiologia
Proteínas Associadas aos Microtúbulos/fisiologia
Raízes de Plantas/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Arabidopsis/fisiologia
Coifa/crescimento & desenvolvimento
Coifa/fisiologia
Raízes de Plantas/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Arabidopsis Proteins); 0 (MAP18 protein, Arabidopsis); 0 (Microtubule-Associated Proteins)
[Em] Mês de entrada:1604
[Cu] Atualização por classe:171004
[Lr] Data última revisão:
171004
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150502
[St] Status:MEDLINE
[do] DOI:10.1007/s00299-015-1789-6


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[PMID]:25615266
[Au] Autor:Xiong J; Yang Y; Fu G; Tao L
[Ad] Endereço:State Key Laboratory of Rice Biology, China National Rice Research Institute, 359 Tiyuchang Road, Hangzhou, 310006, China; College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
[Ti] Título:Novel roles of hydrogen peroxide (H2O2) in regulating pectin synthesis and demethylesterification in the cell wall of rice (Oryza sativa) root tips.
[So] Source:New Phytol;206(1):118-26, 2015 Apr.
[Is] ISSN:1469-8137
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Hydrogen peroxide (H2O2) has been reported to increase lignin formation, enhance cell wall rigidification, restrict cell expansion and inhibit root elongation. However, our results showed that it not only inhibited rice (Oryza sativa) root elongation, but also increased root diameter. No study has reported how and why H2O2 increases cell expansion and root diameter. Exogenous H2O2 and its scavenger 4-hydroxy-Tempo were applied to confirm the roles of H2O2. Immunofluorescence, fluorescence probe, ruthenium red staining, histological section and spectrophotometry were used to monitor changes in the degree of pectin methylesterification, pectin content, pectin methylesterase (PME) activity and H2O2 content. Exogenous H2O2 inhibited root elongation, but increased cell expansion and root diameter significantly. H2O2 not only increased the region of pectin synthesis and pectin content in root tips, but also increased PME activity and pectin demethylesterification. The scavenger 4-hydroxy-Tempo reduced root H2O2 content and recovered H2O2-induced increases in cell expansion and root diameter by inhibiting pectin synthesis, PME activity and pectin demethylesterification. H2O2 plays a novel role in the regulation of pectin synthesis, PME activity and pectin demethylesterification. H2O2 increases cell expansion and root diameter by increasing pectin content and demethylesterification.
[Mh] Termos MeSH primário: Hidrolases de Éster Carboxílico/metabolismo
Regulação da Expressão Gênica de Plantas
Peróxido de Hidrogênio/farmacologia
Oryza/fisiologia
Pectinas/metabolismo
[Mh] Termos MeSH secundário: Metabolismo dos Carboidratos
Hidrolases de Éster Carboxílico/genética
Parede Celular/metabolismo
Óxidos N-Cíclicos/farmacologia
Esterificação
Peróxido de Hidrogênio/metabolismo
Hidroxilamina/farmacologia
Meristema/efeitos dos fármacos
Meristema/enzimologia
Meristema/fisiologia
Oryza/efeitos dos fármacos
Oryza/enzimologia
Proteínas de Plantas/genética
Proteínas de Plantas/metabolismo
Coifa/efeitos dos fármacos
Coifa/enzimologia
Coifa/fisiologia
Raízes de Plantas/efeitos dos fármacos
Raízes de Plantas/enzimologia
Raízes de Plantas/fisiologia
Espécies Reativas de Oxigênio/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Cyclic N-Oxides); 0 (Pectins); 0 (Plant Proteins); 0 (Reactive Oxygen Species); 2FP81O2L9Z (Hydroxylamine); 89NA02M4RX (pectin); BBX060AN9V (Hydrogen Peroxide); EC 3.1.1.- (Carboxylic Ester Hydrolases); EC 3.1.1.11 (pectinesterase); V55XB6IT82 (TEMPOL-H)
[Em] Mês de entrada:1602
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150124
[St] Status:MEDLINE
[do] DOI:10.1111/nph.13285



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