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Pesquisa : A18.450 [Categoria DeCS]
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  1 / 359 MEDLINE  
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[PMID]:28985652
[Au] Autor:Zhang BL; Ouyang YN; Xu JY; Liu K
[Ad] Endereço:Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Yangtze University, Jingzhou 434023, China; Hubei Collaborative Innovation Center for Grain Industry, Yangtze University, Jingzhou 434023, China. Electronic address: zhangbl833@hotmail.com.
[Ti] Título:Cadmium remobilization from shoot to grain is related to pH of vascular bundle in rice.
[So] Source:Ecotoxicol Environ Saf;147:913-918, 2018 Jan.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The remobilization of cadmium (Cd) from shoots to grain is the key process to determine the Cd accumulation in grain. The apoplastic pH of plants is an important factor and signal in influencing on plant responding to environmental variation and inorganic elements uptake. It is proposed that pH of rice plants responds and influences on Cd remobilization from shoots to grain when rice is exposed to Cd stress. The results of hydroponic experiment showed that: pH of the rice leaf vascular bundles among 3 cultivars was almost increased, pH value of 1 cultivar was slightly increasing when rice plants were treated with Cd. The decrease degree of H concentration in leaf vascular bundles was different among cultivars. The cultivar with higher decreasing in H concentration, showed higher Cd transfer efficiency from shoots to grain. The H concentration of leaf vascular bundles under normal condition was negatively correlated to cadmium accumulation in leaf. Moreover, pH change was related to Cd accumulation in shots and remobilization from shoots to grain. Uncovering the role of pH response is a key component for the understanding Cd uptake and remobilization mechanism for rice production.
[Mh] Termos MeSH primário: Cádmio/metabolismo
Grãos Comestíveis/metabolismo
Oryza/metabolismo
Brotos de Planta/metabolismo
Feixe Vascular de Plantas/química
Poluentes do Solo/metabolismo
[Mh] Termos MeSH secundário: Transporte Biológico
Cádmio/análise
Grãos Comestíveis/química
Concentração de Íons de Hidrogênio
Hidroponia
Modelos Teóricos
Oryza/química
Folhas de Planta/química
Brotos de Planta/química
Poluentes do Solo/análise
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil Pollutants); 00BH33GNGH (Cadmium)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171008
[St] Status:MEDLINE


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[PMID]:27770776
[Au] Autor:Jooste M; Dreyer LL; Oberlander KC
[Ad] Endereço:Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africa. mich.jooste.m@gmail.com.
[Ti] Título:The phylogenetic significance of leaf anatomical traits of southern African Oxalis.
[So] Source:BMC Evol Biol;16(1):225, 2016 10 22.
[Is] ISSN:1471-2148
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The southern African Oxalis radiation is extremely morphologically variable. Despite recent progress in the phylogenetics of the genus, there are few morphological synapomorphies supporting DNA-based clades. Leaflet anatomy can provide an understudied and potentially valuable source of information on the evolutionary history and systematics of this lineage. Fifty-nine leaflet anatomical traits of 109 southern African Oxalis species were assessed in search of phylogenetically significant characters that delineate clades. RESULTS: A combination of 6 leaflet anatomical traits (stomatal position, adaxial epidermal cells, abaxial epidermal cells, mesophyll, sheath around vascular tissue, degree of leaflet conduplication) clearly support various clades defined by previous DNA-based phylogenetic work. Other, mostly continuous leaflet anatomical traits were highly variable and showed less phylogenetic pattern. CONCLUSIONS: Major and unexpected findings include the transition from ancestral hypostomatic leaflets to adaxially-located stomata in the vast majority of southern African Oxalis, the loss of semi-swollen AB epidermal cells and the gain of swollen adaxial and abaxial epidermal cells in selected clades, and multiple changes from ancestral bifacial mesophyll to isobilateral or homogenous mesophyll types. The information gathered in this study will aid in the taxonomic revision of this speciose member of the Greater Cape Floristic Region and provide a basis for future hypotheses regarding its radiation.
[Mh] Termos MeSH primário: Oxalidaceae/anatomia & histologia
Filogenia
Folhas de Planta/anatomia & histologia
[Mh] Termos MeSH secundário: Evolução Biológica
Duplicação Gênica
Células do Mesofilo/citologia
Oxalidaceae/genética
Fenótipo
Folhas de Planta/citologia
Folhas de Planta/genética
Estômatos de Plantas/citologia
Feixe Vascular de Plantas/citologia
Característica Quantitativa Herdável
Tricomas/citologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1708
[Cu] Atualização por classe:180128
[Lr] Data última revisão:
180128
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE


  3 / 359 MEDLINE  
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[PMID]:28851711
[Au] Autor:Gujas B; Cruz TMD; Kastanaki E; Vermeer JEM; Munnik T; Rodriguez-Villalon A
[Ad] Endereço:Department of Biology, Swiss Federal Institute of Technology (ETH) Zurich, CH-8092, Zurich, Switzerland.
[Ti] Título:Perturbing phosphoinositide homeostasis oppositely affects vascular differentiation in roots.
[So] Source:Development;144(19):3578-3589, 2017 10 01.
[Is] ISSN:1477-9129
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The plant vascular network consists of specialized phloem and xylem elements that undergo two distinct morphogenetic developmental programs to become transport-functional units. Whereas vacuolar rupture is a determinant step in protoxylem differentiation, protophloem elements never form a big central vacuole. Here, we show that a genetic disturbance of phosphatidylinositol 4,5-bis-phosphate [PtdIns(4,5)P ] homeostasis rewires cell trafficking towards the vacuole in roots. Consequently, an enhanced phosphoinositide-mediated vacuolar biogenesis correlates with premature programmed cell death (PCD) and secondary cell wall elaboration in xylem cells. By contrast, vacuolar fusion events in protophloem cells trigger the abnormal formation of big vacuoles, preventing cell clearance and tissue functionality. Removal of the inositol 5' phosphatase COTYLEDON VASCULAR PATTERN 2 from the plasma membrane (PM) by brefeldin A (BFA) treatment increases PtdIns(4,5)P content at the PM and disrupts protophloem continuity. Conversely, BFA application abolishes vacuolar fusion events in xylem tissue without preventing PCD, suggesting the existence of additional PtdIns(4,5)P -dependent cell death mechanisms. Overall, our data indicate that tight PM phosphoinositide homeostasis is required to modulate intracellular trafficking contributing to oppositely regulate vascular differentiation.
[Mh] Termos MeSH primário: Arabidopsis/citologia
Diferenciação Celular
Homeostase
Fosfatidilinositóis/metabolismo
Raízes de Plantas/citologia
Feixe Vascular de Plantas/citologia
[Mh] Termos MeSH secundário: Apoptose/efeitos dos fármacos
Arabidopsis/efeitos dos fármacos
Arabidopsis/metabolismo
Proteínas de Arabidopsis/metabolismo
Transporte Biológico/efeitos dos fármacos
Diferenciação Celular/efeitos dos fármacos
Membrana Celular/efeitos dos fármacos
Membrana Celular/metabolismo
Estradiol/farmacologia
Homeostase/efeitos dos fármacos
Espaço Intracelular/metabolismo
Floema/citologia
Floema/efeitos dos fármacos
Floema/metabolismo
Raízes de Plantas/efeitos dos fármacos
Raízes de Plantas/metabolismo
Feixe Vascular de Plantas/efeitos dos fármacos
Feixe Vascular de Plantas/metabolismo
Vacúolos/efeitos dos fármacos
Vacúolos/metabolismo
Xilema/citologia
Xilema/efeitos dos fármacos
Xilema/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Arabidopsis Proteins); 0 (Phosphatidylinositols); 4TI98Z838E (Estradiol)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171126
[Lr] Data última revisão:
171126
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170831
[St] Status:MEDLINE
[do] DOI:10.1242/dev.155788


  4 / 359 MEDLINE  
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[PMID]:28369351
[Au] Autor:Chitwood DH; Otoni WC
[Ad] Endereço:Donald Danforth Plant Science Center, St. Louis, MO, USA.
[Ti] Título:Morphometric analysis of Passiflora leaves: the relationship between landmarks of the vasculature and elliptical Fourier descriptors of the blade.
[So] Source:Gigascience;6(1):1-13, 2017 Jan 01.
[Is] ISSN:2047-217X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Background: Leaf shape among Passiflora species is spectacularly diverse. Underlying this diversity in leaf shape are profound changes in the patterning of the primary vasculature and laminar outgrowth. Each of these aspects of leaf morphology-vasculature and blade-provides different insights into leaf patterning. Results: Here, we morphometrically analyze >3300 leaves from 40 different Passiflora species collected sequentially across the vine. Each leaf is measured in two different ways: using 1) 15 homologous Procrustes-adjusted landmarks of the vasculature, sinuses, and lobes; and 2) Elliptical Fourier Descriptors (EFDs), which quantify the outline of the leaf. The ability of landmarks, EFDs, and both datasets together are compared to determine their relative ability to predict species and node position within the vine. Pairwise correlation of x and y landmark coordinates and EFD harmonic coefficients reveals close associations between traits and insights into the relationship between vasculature and blade patterning. Conclusions: Landmarks, more reflective of the vasculature, and EFDs, more reflective of the blade contour, describe both similar and distinct features of leaf morphology. Landmarks and EFDs vary in ability to predict species identity and node position in the vine and exhibit a correlational structure (both within landmark or EFD traits and between the two data types) revealing constraints between vascular and blade patterning underlying natural variation in leaf morphology among Passiflora species.
[Mh] Termos MeSH primário: Padronização Corporal
Biologia Computacional
Passiflora/anatomia & histologia
Folhas de Planta/anatomia & histologia
[Mh] Termos MeSH secundário: Análise de Fourier
Passiflora/classificação
Passiflora/crescimento & desenvolvimento
Folhas de Planta/crescimento & desenvolvimento
Feixe Vascular de Plantas/anatomia & histologia
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[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:170404
[St] Status:MEDLINE
[do] DOI:10.1093/gigascience/giw008


  5 / 359 MEDLINE  
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[PMID]:28280959
[Au] Autor:Li T; Blande JD
[Ad] Endereço:Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio Campus, PO Box 1627, 70211, Kuopio, FI, Finland. tao.li@bio.ku.dk.
[Ti] Título:Volatile-Mediated within-Plant Signaling in Hybrid Aspen: Required for Systemic Responses.
[So] Source:J Chem Ecol;43(4):327-338, 2017 Apr.
[Is] ISSN:1573-1561
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Plant volatiles play crucial roles in signaling between plants and their associated community members, but their role in within-plant signaling remains largely unexplored, particularly under field conditions. Using a system comprising the hybrid aspen (Populus tremula x tremuloides) and the specialized herbivorous leaf beetle (Phratora laticollis) and, combining field, greenhouse and laboratory experiments, we examined whether local damage triggered systemic responses in undamaged branches that lack vascular connection to the damaged branches, and to what extent this was caused by airborne volatile signals versus internal signals. An experiment tracing dye through the vasculature of saplings revealed no downward movement of the dye from upper to lower branches, suggesting a lack of vascular connectivity among branches. However, we found under both field and laboratory conditions that herbivore feeding on upper branches elicited volatile emissions by undamaged lower branches. Greenhouse experiments manipulating air contact between damaged and undamaged branches showed that systemic induction of volatiles was almost eliminated when air contact was interrupted. Our findings clearly demonstrate that herbivore-induced volatiles overcome vascular constraints and mediate within-plant signaling. Further, we found that volatile signaling led to induction of different classes of volatiles under field and environment controlled conditions, with a weaker response observed in the field. This difference not only reflects the dose- and time-dependent nature of volatile signaling, but also points out that future studies should focus more on field observations to better understand the ecological role of volatile-mediated within-plant signaling.
[Mh] Termos MeSH primário: Coleópteros/fisiologia
Populus/metabolismo
Compostos Orgânicos Voláteis/metabolismo
[Mh] Termos MeSH secundário: Animais
Calibragem
Cromatografia Gasosa-Espectrometria de Massas
Herbivoria
Folhas de Planta/química
Feixe Vascular de Plantas/anatomia & histologia
Sesquiterpenos/análise
Transdução de Sinais
Volatilização
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Sesquiterpenes); 0 (Volatile Organic Compounds)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170311
[St] Status:MEDLINE
[do] DOI:10.1007/s10886-017-0826-z


  6 / 359 MEDLINE  
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[PMID]:28255816
[Au] Autor:Gevú KV; Lima HRP; Kress J; Da Cunha M
[Ad] Endereço:Laboratório de Biologia Celular e Tecidual, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego 2000, Parque Califórnia, Campos dos Goytacazes, RJ, 28013-602, Brazil.
[Ti] Título:Morphological analysis of vessel elements for systematic study of three Zingiberaceae tribes.
[So] Source:J Plant Res;130(3):527-538, 2017 May.
[Is] ISSN:1618-0860
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:Zingiberaceae containing over 1,000 species that are divided into four subfamilies and six tribes. In recent decades, there has been an increase in the number of studies about vessel elements in families of monocotyledon. However, there are still few studies of Zingiberaceae tribes. This study aims to establish systematic significance of studying vessel elements in two subfamilies and three tribes of Zingiberaceae. The vegetative organs of 33 species processed were analysed by light and scanning electron microscopy and Principal Component Analysis was used to elucidate genera boundaries. Characteristics of vessel elements, such as the type of perforation plate, the number of bars and type of parietal thickening, are proved to be important for establishing the relationship among taxa. Scalariform perforation plate and the scalariform parietal thickening are frequent in Zingiberaceae and may be a plesiomorphic condition for this taxon. In the Principal Component Analysis, the most significant characters of the vessel elements were: simple perforation plates and partially pitted parietal thickening, found only in Alpinieae tribe, and 40 or more bars composing the plate in Elettariopsis curtisii, Renealmia chrysotricha, Zingiber spectabile, Z. officinale, Curcuma and Globba species. Vessel elements characters of 18 species of Alpinieae, Zingibereae and Globbeae were first described in this work.
[Mh] Termos MeSH primário: Filogenia
Feixe Vascular de Plantas/anatomia & histologia
Feixe Vascular de Plantas/citologia
Grupos Populacionais/classificação
Zingiberaceae/anatomia & histologia
Zingiberaceae/classificação
[Mh] Termos MeSH secundário: Curcuma
Seres Humanos
Magnoliopsida/anatomia & histologia
Magnoliopsida/classificação
Magnoliopsida/citologia
Microscopia Eletrônica de Varredura
Extratos Vegetais
Folhas de Planta/anatomia & histologia
Raízes de Plantas/anatomia & histologia
Feixe Vascular de Plantas/classificação
Rizoma/anatomia & histologia
Especificidade da Espécie
Xilema
Zingiberaceae/citologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Plant Extracts); 856YO1Z64F (turmeric extract)
[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:170304
[St] Status:MEDLINE
[do] DOI:10.1007/s10265-017-0911-y


  7 / 359 MEDLINE  
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[PMID]:28084728
[Au] Autor:Reza M; Bertinetto C; Ruokolainen J; Vuorinen T
[Ad] Endereço:Department of Applied Physics, Aalto University , P.O. Box 11100, FI-00076 Aalto, Finland.
[Ti] Título:Cellulose Elementary Fibrils Assemble into Helical Bundles in S Layer of Spruce Tracheid Wall.
[So] Source:Biomacromolecules;18(2):374-378, 2017 Feb 13.
[Is] ISSN:1526-4602
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The ultrastructural organization of cellulose elementary fibrils (EFs) in wood cell wall is considered to be the prime factor regulating the material characteristics of wood in micro to macro levels and the conversion of delignified wood fibers into various products. Specifically, the complex assembly of EFs in wood cell wall limits its swellability, solubility, and reactivity, for example, in dissolution of cellulose for regeneration of textile fibers, fibril separation for the manufacture of nanocellulose, and enzymatic hydrolysis of cellulose into sugars for their subsequent fermentation to various products, like ethanol for future fossil fuels replacement. Here cryo-transmission electron tomography was applied on ultrathin spruce wood sections to reveal the EF assembly in S layer of the native cell wall. The resolution of these tomograms was then further enhanced by computational means. For the first time, cellulose in the intact cell wall was visualized to be assembled into helical bundles of several EFs, a structural feature that must have a significant impact on the swelling, accessibility, and solubility of woody biomass for its conversion into the aforementioned value added products.
[Mh] Termos MeSH primário: Parede Celular/química
Celulose/química
Picea/química
Feixe Vascular de Plantas/química
Madeira/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
9004-34-6 (Cellulose)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171011
[Lr] Data última revisão:
171011
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170114
[St] Status:MEDLINE
[do] DOI:10.1021/acs.biomac.6b01396


  8 / 359 MEDLINE  
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[PMID]:27522959
[Au] Autor:Kubo FC; Yasui Y; Kumamaru T; Sato Y; Hirano HY
[Ad] Endereço:Department of Biological Sciences, Graduate School of Science, The University of Tokyo.
[Ti] Título:Genetic analysis of rice mutants responsible for narrow leaf phenotype and reduced vein number.
[So] Source:Genes Genet Syst;91(4):235-240, 2017 Mar 17.
[Is] ISSN:1880-5779
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:Leaves are a major site for photosynthesis and a key determinant of plant architecture. Rice produces thin and slender leaves, which consist of the leaf blade and leaf sheath separated by the lamina joint. Two types of vasculature, the large and small vascular bundles, run in parallel, together with a strong structure, the midrib. In this paper, we examined the function of four genes that regulate the width of the leaf blade and the vein number: NARROW LEAF1 (NAL1), NAL2, NAL3 and NAL7. We backcrossed original mutants of these genes with the standard wild-type rice, Taichung 65. We then compared the effect of each mutation on similar genetic backgrounds and examined genetic interactions of these genes. The nal1 single mutation and the nal2 nal3 double mutation showed a severe effect on leaf width, resulting in very narrow leaves. Although vein number was also reduced in the nal1 and nal2 nal3 mutants, the small vein number was more strongly reduced than the large vein number. In contrast, the nal7 mutation showed a milder effect on leaf width and vein number, and both the large and small veins were similarly affected. Thus, the genes responsible for narrow leaf phenotype seem to play distinct roles. The nal7 mutation showed additive effects on both leaf width and vein number, when combined with the nal1 single or the nal2 nal3 double mutation. In addition, observations of inner tissues revealed that cell differentiation was partially compromised in the nal2 nal3 nal7 mutant, consistent with the severe reduction in leaf width in this triple mutant.
[Mh] Termos MeSH primário: Mutação
Oryza/genética
Folhas de Planta/anatomia & histologia
Proteínas de Plantas/genética
[Mh] Termos MeSH secundário: Diferenciação Celular
Clonagem Molecular
Regulação da Expressão Gênica de Plantas
Oryza/anatomia & histologia
Oryza/ultraestrutura
Fenótipo
Folhas de Planta/genética
Folhas de Planta/ultraestrutura
Feixe Vascular de Plantas/anatomia & histologia
Feixe Vascular de Plantas/genética
Plantas Geneticamente Modificadas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Plant Proteins)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170330
[Lr] Data última revisão:
170330
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160816
[St] Status:MEDLINE
[do] DOI:10.1266/ggs.16-00018


  9 / 359 MEDLINE  
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[PMID]:26996832
[Au] Autor:Santhanam P; Boshoven JC; Salas O; Bowler K; Islam MT; Saber MK; van den Berg GC; Bar-Peled M; Thomma BP
[Ad] Endereço:Laboratory of Phytopathology, Wageningen University, Droevendaalsesteeg 1, 6708, PB, Wageningen, the Netherlands.
[Ti] Título:Rhamnose synthase activity is required for pathogenicity of the vascular wilt fungus Verticillium dahliae.
[So] Source:Mol Plant Pathol;18(3):347-362, 2017 Apr.
[Is] ISSN:1364-3703
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The initial interaction of a pathogenic fungus with its host is complex and involves numerous metabolic pathways and regulatory proteins. Considerable attention has been devoted to proteins that play a crucial role in these interactions, with an emphasis on so-called effector molecules that are secreted by the invading microbe to establish the symbiosis. However, the contribution of other types of molecules, such as glycans, is less well appreciated. Here, we present a random genetic screen that enabled us to identify 58 novel candidate genes that are involved in the pathogenic potential of the fungal pathogen Verticillium dahliae, which causes vascular wilt diseases in over 200 dicotyledonous plant species, including economically important crops. One of the candidate genes that was identified concerns a putative biosynthetic gene involved in nucleotide sugar precursor formation, as it encodes a putative nucleotide-rhamnose synthase/epimerase-reductase (NRS/ER). This enzyme has homology to bacterial enzymes involved in the biosynthesis of the nucleotide sugar deoxy-thymidine diphosphate (dTDP)-rhamnose, a precursor of L-rhamnose, which has been shown to be required for virulence in several human pathogenic bacteria. Rhamnose is known to be a minor cell wall glycan in fungi and has therefore not been suspected as a crucial molecule in fungal-host interactions. Nevertheless, our study shows that deletion of the VdNRS/ER gene from the V. dahliae genome results in complete loss of pathogenicity on tomato and Nicotiana benthamiana plants, whereas vegetative growth and sporulation are not affected. We demonstrate that VdNRS/ER is a functional enzyme in the biosynthesis of uridine diphosphate (UDP)-rhamnose, and further analysis has revealed that VdNRS/ER deletion strains are impaired in the colonization of tomato roots. Collectively, our results demonstrate that rhamnose, although only a minor cell wall component, is essential for the pathogenicity of V. dahliae.
[Mh] Termos MeSH primário: Carboidratos Epimerases/metabolismo
Proteínas Fúngicas/metabolismo
Doenças das Plantas/microbiologia
Feixe Vascular de Plantas/microbiologia
Verticillium/enzimologia
Verticillium/patogenicidade
[Mh] Termos MeSH secundário: Parede Celular/metabolismo
DNA Bacteriano/genética
DNA Intergênico/genética
Deleção de Genes
Interações Hospedeiro-Patógeno/genética
Lycopersicon esculentum/microbiologia
Mutagênese Insercional/genética
Raízes de Plantas/microbiologia
Ramnose/metabolismo
Esporos Fúngicos/fisiologia
Tabaco/microbiologia
Transformação Genética
Difosfato de Uridina/metabolismo
Verticillium/genética
Virulência
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Bacterial); 0 (DNA, Intergenic); 0 (Fungal Proteins); 0 (T-DNA); 58-98-0 (Uridine Diphosphate); EC 5.1.3.- (Carbohydrate Epimerases); QN34XC755A (Rhamnose)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170619
[Lr] Data última revisão:
170619
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160322
[St] Status:MEDLINE
[do] DOI:10.1111/mpp.12401


  10 / 359 MEDLINE  
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[PMID]:27789737
[Au] Autor:Tian S; Xie R; Wang H; Hu Y; Ge J; Liao X; Gao X; Brown P; Lin X; Lu L
[Ad] Endereço:Key Laboratory of Environment Remediation and Ecological Health, College of Environmental and Resource Science, Zhejiang University, Ministry of Education, Hangzhou 310058, China (S.T., R.X., H.W., Y.H., J.G, X.C.L., X.G., L.L.).
[Ti] Título:Calcium Deficiency Triggers Phloem Remobilization of Cadmium in a Hyperaccumulating Species.
[So] Source:Plant Physiol;172(4):2300-2313, 2016 Dec.
[Is] ISSN:1532-2548
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Understanding cadmium (Cd) accumulation in plants is critical for the development of plant-based strategies for soil remediation and crop safety. Sedum alfredii is a nonbrassica plant species known to hyperaccumulate Cd. The characteristics of Cd uptake, distribution, and retranslocation affected by the Ca status were investigated at cellular levels in S. alfredii Low Ca supply significantly increased Cd contents in shoots of S. alfredii, particularly in the young leaves. Micro x-ray fluorescence images confirmed that sequestration of Cd was greatly enhanced in the young leaves under Ca deficiency stress, with a significant amount of Cd localized in mesophyll cells, compared to the young leaves supplied with high Ca levels. Cd influx into protoplasts isolated from young leaves was significantly inhibited by the addition of Ca channel inhibitors, but not by pre-exposure to Ca deficiency. In stems, the Cd signal in vascular systems under low Ca levels was 10-fold higher than in those treated with higher Ca levels. A detailed investigation of vascular bundles revealed that an extremely high Cd signal induced by low Ca supply occurred in the phloem tissues, but not in the xylem tissues. Transfer of Cd pretreated plants to nutrient solutions at different Ca levels confirmed that a much higher amount of Cd was reallocated to the new growth tissues under low Ca stress compared to plants supplied with sufficient Ca. These results suggest that Ca deficiency triggered a highly efficient phloem remobilization of Cd in S. alfredii and subsequently enhanced Cd accumulation in its young leaves.
[Mh] Termos MeSH primário: Cádmio/metabolismo
Cálcio/deficiência
Floema/metabolismo
Sedum/metabolismo
[Mh] Termos MeSH secundário: Células do Mesofilo/metabolismo
Folhas de Planta/citologia
Folhas de Planta/metabolismo
Caules de Planta/crescimento & desenvolvimento
Caules de Planta/metabolismo
Feixe Vascular de Plantas/metabolismo
Protoplastos/metabolismo
Espectrometria por Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
00BH33GNGH (Cadmium); SY7Q814VUP (Calcium)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171002
[Lr] Data última revisão:
171002
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161030
[St] Status:MEDLINE



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