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Pesquisa : B01.650.940.800.575.912.250.198.500.100.130 [Categoria DeCS]
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[PMID]:29323896
[Au] Autor:He CT; Zhou YH; Huang YY; Fu HL; Wang XS; Gong FY; Tan X; Yang ZY
[Ad] Endereço:State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University , Xingang Xi Road 135, Guangzhou, 510275, China.
[Ti] Título:Different Proteomic Processes Related to the Cultivar-Dependent Cadmium Accumulation of Amaranthus gangeticus.
[So] Source:J Agric Food Chem;66(5):1085-1095, 2018 Feb 07.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:To deal with the Cd contaminant of agricultural soil, pollution-safe cultivar (PSC) is developed to minimize the Cd accumulation risk in crops. The present study aimed to investigate the different proteomic responses related to Cd accumulation in different tissues between two Amaranthus gangeticus cultivars, Pen and Nan. A significantly higher Cd accumulation in Pen than in Nan was unraveled, especially in shoot. The proportions of soluble Cd in root and stem of Nan were significantly lower than those of Pen, implying lower Cd transportation from root to shoot in Nan. Higher contents of NaCl-extracted Cd in Pen than in Nan were probably attributed to the enhancement of GSH related metabolism in Pen, which activated the transportation of Cd from root to shoot. Alteration of other proteins involved in Cd detoxification and energy production also demonstrated that Pen had exhibited a stronger tolerance than Nan in dealing with Cd stress. Thus, differences in the proteomic processes associated with biochemical differences between the two typical cultivars suggested a cultivar-dependent capacity of Cd tolerance and accumulation in amaranth for the first time.
[Mh] Termos MeSH primário: Amaranthus/metabolismo
Cádmio/metabolismo
Proteômica
[Mh] Termos MeSH secundário: Transporte Biológico
Cádmio/análise
Cádmio/química
Raízes de Plantas/química
Caules de Planta/química
Poluentes do Solo/metabolismo
Especificidade da Espécie
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil Pollutants); 00BH33GNGH (Cadmium)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180226
[Lr] Data última revisão:
180226
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180112
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jafc.7b05042


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[PMID]:28981578
[Au] Autor:Fry SC
[Ad] Endereço:The Edinburgh Cell Wall Group, Institute of Molecular Plant Sciences, The University of Edinburgh, Daniel Rutherford Building, The King's Buildings, Max Born Crescent, Edinburgh EH9 3BF, UK.
[Ti] Título:Potassium, not lepidimoide, is the principal 'allelochemical' of cress-seed exudate that promotes amaranth hypocotyl elongation.
[So] Source:Ann Bot;120(4):511-520, 2017 Oct 17.
[Is] ISSN:1095-8290
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Background and Aims: Imbibed cress ( Lepidium sativum L.) seeds exude 'allelochemicals' that promote excessive hypocotyl elongation and inhibit root growth in neighbouring competitors, e.g. amaranth ( Amaranthus caudatus L.) seedlings. The major hypocotyl promoter has recently been shown not to be the previously suggested acidic disaccharide, lepidimoic acid (LMA), a fragment of the pectic polysaccharide domain rhamnogalacturonan-I. The nature of the hypocotyl promoter has now been re-assessed. Methods: Low-molecular weight cress-seed exudate (LCSE) was fractionated by high-voltage electrophoresis, and components with different charge:mass ratios were tested for effects on dark-grown amaranth seedlings. Further samples of LCSE were size-fractionated by gel permeation chromatography, and active fractions were analysed electrophoretically. Key Results: The LCSE strongly promoted amaranth hypocotyl elongation. The active principle was hydrophilic and, unlike LMA, stable to hot acid. After electrophoresis at pH 6·5, the only fractions that strongly promoted hypocotyl elongation were those with a very high positive charge:mass ratio, migrating towards the cathode 3-4 times faster than glucosamine. Among numerous naturally occurring cations tested, the only one with such a high mobility was potassium. K + was present in LCSE at approx. 4 m m , and pure KCl (1-10 m m ) strongly promoted amaranth hypocotyl elongation. No other cation tested (including Na + , spermidine and putrescine) had this effect. The peak of bioactivity from a gel permeation chromatography column exactly coincided with the peak of K + . Conclusions: The major 'allelopathic' substance present in cress-seed exudate that stimulates hypocotyl elongation in neighbouring seedlings is the inorganic cation, K + , not the oligosaccharin LMA.
[Mh] Termos MeSH primário: Amaranthus/crescimento & desenvolvimento
Dissacarídeos/fisiologia
Exsudatos e Transudatos/fisiologia
Hipocótilo/crescimento & desenvolvimento
Lepidium sativum/fisiologia
Potássio/fisiologia
Sementes/metabolismo
[Mh] Termos MeSH secundário: Amaranthus/metabolismo
Cromatografia em Gel
Eletroforese/métodos
Exsudatos e Transudatos/química
Hipocótilo/metabolismo
Lepidium sativum/metabolismo
Sementes/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Disaccharides); 145039-76-5 (lepidimoide); RWP5GA015D (Potassium)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171109
[Lr] Data última revisão:
171109
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171006
[St] Status:MEDLINE
[do] DOI:10.1093/aob/mcx081


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[PMID]:28805378
[Au] Autor:Quiroga AV; Aphalo P; Nardo AE; Añón MC
[Ad] Endereço:Facultad de Ciencias Exactas, Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET-CCT La Plata) y Comisión de Investigaciones Científicas (CIC-PBA), Universidad Nacional de La Plata (UNLP) , Calle 47 y 116,
[Ti] Título:In Vitro Modulation of Renin-Angiotensin System Enzymes by Amaranth (Amaranthus hypochondriacus) Protein-Derived Peptides: Alternative Mechanisms Different from ACE Inhibition.
[So] Source:J Agric Food Chem;65(34):7415-7423, 2017 Aug 30.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Among the factors affecting the development of cardiovascular diseases, hypertension is one of the most important. Research done on amaranth proteins has demonstrated their hypotensive capacity in vivo and in vitro; nevertheless, the mechanism underlying this effect remains unclear. The aim of this study was to analyze in vitro the inhibition of peptides derived from an amaranth hydrolysate (AHH) on other RAS enzymes other than ACE. The chymase and renin activities were studied. AHH was not able to inhibit chymase activity, although a dose-response effect was found on renin activity (IC 0.6 mg/mL). To provide an approach to the renin inhibition mechanism, we analyzed AHH renin inhibition kinetics and performed a structural characterization of the peptides involved in the effect in terms of molecular size and hydrophobicity. Results suggest that amaranth peptides exhibit renin competitive inhibition behavior. Renin inhibition potency was directly related to peptide hydrophobicity. RP-HPLC separation of AHH and subsequent analysis of the peptide sequences showed 6 peptides belonging to 11S globulin (that can be grouped into 3 families) that would be responsible for renin inhibition. These results demonstrate that Amaranthus hypochondriacus seeds are an adequate source of peptides with renin inhibitory properties that could be used in functional food formulations.
[Mh] Termos MeSH primário: Amaranthus/química
Inibidores da Enzima Conversora de Angiotensina/química
Anti-Hipertensivos/química
Peptídeos/química
Proteínas de Plantas/química
Sistema Renina-Angiotensina/efeitos dos fármacos
[Mh] Termos MeSH secundário: Amaranthus/genética
Sequência de Aminoácidos
Inibidores da Enzima Conversora de Angiotensina/farmacologia
Anti-Hipertensivos/farmacologia
Seres Humanos
Cinética
Peptídeos/genética
Peptídeos/farmacologia
Proteínas de Plantas/genética
Proteínas de Plantas/farmacologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Angiotensin-Converting Enzyme Inhibitors); 0 (Antihypertensive Agents); 0 (Peptides); 0 (Plant Proteins)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170915
[Lr] Data última revisão:
170915
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170815
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jafc.7b02240


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[PMID]:28786999
[Au] Autor:Sunil M; Hariharan N; Dixit S; Choudhary B; Srinivasan S
[Ad] Endereço:Institute of Bioinformatics and Applied Biotechnology, Bangalore, Karnataka, India.
[Ti] Título:Differential genomic arrangements in Caryophyllales through deep transcriptome sequencing of A. hypochondriacus.
[So] Source:PLoS One;12(8):e0180528, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Genome duplication event in edible dicots under the orders Rosid and Asterid, common during the oligocene period, is missing for species under the order Caryophyllales. Despite this, grain amaranths not only survived this period but display many desirable traits missing in species under rosids and asterids. For example, grain amaranths display traits like C4 photosynthesis, high-lysine seeds, high-yield, drought resistance, tolerance to infection and resilience to stress. It is, therefore, of interest to look for minor genome rearrangements with potential functional implications that are unique to grain amaranths. Here, by deep sequencing and assembly of 16 transcriptomes (86.8 billion bases) we have interrogated differential genome rearrangement unique to Amaranthus hypochondriacus with potential links to these phenotypes. We have predicted 125,581 non-redundant transcripts including 44,529 protein coding transcripts identified based on homology to known proteins and 13,529 predicted as novel/amaranth specific coding transcripts. Of the protein coding de novo assembled transcripts, we have identified 1810 chimeric transcripts. More than 30% and 19% of the gene pairs within the chimeric transcripts are found within the same loci in the genomes of A. hypochondriacus and Beta vulgaris respectively and are considered real positives. Interestingly, one of the chimeric transcripts comprises two important genes, namely DHDPS1, a key enzyme implicated in the biosynthesis of lysine, and alpha-glucosidase, an enzyme involved in sucrose catabolism, in close proximity to each other separated by a distance of 612 bases in the genome of A. hypochondriacus in a convergent configuration. We have experimentally validated that transcripts of these two genes are also overlapping in the 3' UTR with their expression negatively correlated from bud to mature seed, suggesting a potential link between the high seed lysine trait and unique genome organization.
[Mh] Termos MeSH primário: Amaranthus/genética
Amaranthus/metabolismo
Genoma de Planta
Transcriptoma
[Mh] Termos MeSH secundário: Beta vulgaris/genética
Beta vulgaris/metabolismo
Análise por Conglomerados
Biologia Computacional
Fusão Gênica
Homologia de Genes
Loci Gênicos
Sequenciamento de Nucleotídeos em Larga Escala
Lisina/metabolismo
Fenótipo
Proteínas de Plantas/genética
Proteínas de Plantas/metabolismo
Sementes/genética
Sementes/metabolismo
Homologia de Sequência
alfa-Glucosidases/genética
alfa-Glucosidases/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Plant Proteins); EC 3.2.1.20 (alpha-Glucosidases); K3Z4F929H6 (Lysine)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171004
[Lr] Data última revisão:
171004
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170809
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0180528


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[PMID]:28667473
[Au] Autor:Wang C; Zhou J; Liu J; Jiang K
[Ad] Endereço:Institute of Environment and Ecology, Academy of Environmental Health and Ecological Security & School of the Environment and Safety Engineering, Jiangsu University, No. 301, Xuefu Road, Zhenjiang, 212013, People's Republic of China. liuyuexue623@163.com.
[Ti] Título:Differences in functional traits between invasive and native Amaranthus species under different forms of N deposition.
[So] Source:Naturwissenschaften;104(7-8):59, 2017 Aug.
[Is] ISSN:1432-1904
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Differences in functional traits between invasive and native plant species are believed to determine the invasion success of the former. Increasing amounts of anthropogenic nitrogen (N) are continually deposited into natural ecosystems, which may change the relative occurrence of the different N deposition forms (such as NH -N, NO -N, and CO(NH ) -N) naturally deposited. Under high N deposition scenarios, some invasive species may grow faster, gaining advantage over native species. In a greenhouse experiment, we grew invasive and native Amaranthus species from seed both alone and in competition under simulated N enriched environments with different forms of N over 3 months. Then, we measured different leaf traits (i.e., plant height, leaf length, leaf width, leaf shape index, specific leaf area (SLA), and leaf chlorophyll and N concentrations). Results showed that the competition intensity between A. retroflexus and A. tricolor decreased under N deposition. This may be due to the large functional divergence between A. retroflexus and A. tricolor under simulated N deposition. Phenotypic plasticity of SLA and leaf chlorophyll concentration of A. retroflexus were significantly lower than in A. tricolor. The lower range of phenotypic plasticity of SLA and leaf chlorophyll concentration of A. retroflexus may indicate a fitness cost for plastic functional traits under adverse environments. The restricted phenotypic plasticity of SLA and leaf chlorophyll concentration of A. retroflexus may also stabilize leaf construction costs and the growth rate. Meanwhile, the two Amaranthus species possessed greater plasticity in leaf N concentration under NO -N fertilization, which enhanced their competitiveness.
[Mh] Termos MeSH primário: Amaranthus
[Mh] Termos MeSH secundário: Ecossistema
Espécies Introduzidas
Fenótipo
Folhas de Planta
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171016
[Lr] Data última revisão:
171016
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170702
[St] Status:MEDLINE
[do] DOI:10.1007/s00114-017-1482-4


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[PMID]:28662111
[Au] Autor:Kaundun SS; Hutchings SJ; Dale RP; Howell A; Morris JA; Kramer VC; Shivrain VK; Mcindoe E
[Ad] Endereço:Syngenta Ltd., Jealott's Hill International Research Centre, Bracknell, Berkshire, United Kingdom.
[Ti] Título:Mechanism of resistance to mesotrione in an Amaranthus tuberculatus population from Nebraska, USA.
[So] Source:PLoS One;12(6):e0180095, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Amaranthus tuberculatus is a troublesome weed in corn and soybean production systems in Midwestern USA, due in part to its ability to evolve multiple resistance to key herbicides including 4-hydroxyphenylpyruvate dioxygenase (HPPD). Here we have investigated the mechanism of resistance to mesotrione, an important chemical for managing broadleaf weeds in corn, in a multiple herbicide resistant population (NEB) from Nebraska. NEB showed a 2.4-fold and 45-fold resistance increase to mesotrione compared to a standard sensitive population (SEN) in pre-emergence and post-emergence dose-response pot tests, respectively. Sequencing of the whole HPPD gene from 12 each of sensitive and resistant plants did not detect any target-site mutations that could be associated with post-emergence resistance to mesotrione in NEB. Resistance was not due to HPPD gene duplication or over-expression before or after herbicide treatment, as revealed by qPCR. Additionally, no difference in mesotrione uptake was detected between NEB and SEN. In contrast, higher levels of mesotrione metabolism via 4-hydroxylation of the dione ring were observed in NEB compared to the sensitive population. Overall, the NEB population was characterised by lower levels of parent mesotrione exported to other parts of the plant, either as a consequence of metabolism in the treated leaves and/or impaired translocation of the herbicide. This study demonstrates another case of non-target-site based resistance to an important class of herbicides in an A. tuberculatus population. The knowledge generated here will help design strategies for managing multiple herbicide resistance in this problematic weed species.
[Mh] Termos MeSH primário: Amaranthus/efeitos dos fármacos
Cicloexanonas/farmacologia
Herbicidas/farmacologia
Plantas Daninhas/efeitos dos fármacos
[Mh] Termos MeSH secundário: Amaranthus/genética
Amaranthus/metabolismo
Transporte Biológico
Radioisótopos de Carbono/metabolismo
Duplicação Gênica
Genes de Plantas
Nebraska
Plantas Daninhas/genética
Plantas Daninhas/metabolismo
Reação em Cadeia da Polimerase em Tempo Real
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Carbon Radioisotopes); 0 (Cyclohexanones); 0 (Herbicides); 48TR68G21T (mesotrione)
[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:170630
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0180095


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[PMID]:28605187
[Au] Autor:da Silva BP; Nepomuceno MP; Varela RM; Torres A; Molinillo JMG; Alves PLCA; Macías FA
[Ad] Endereço:Department of Applied Biology to Agropecuary, São Paulo State University, UNESP , 14884-900 Jaboticabal, Brazil.
[Ti] Título:Phytotoxicity Study on Bidens sulphurea Sch. Bip. as a Preliminary Approach for Weed Control.
[So] Source:J Agric Food Chem;65(25):5161-5172, 2017 Jun 28.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Farmers of the Franca region in Brazil observed that Bidens sulphurea was able to eliminate the Panicum maximum weed, which infected coffee plantations, without affecting the crop. In an effort to determine if the inhibitory effects observed were due to the presence of phytotoxic compounds from leaves and roots, a biodirected isolation and spectroscopic characterization has been carried out. The leaf dichloromethane and root acetone extracts were the most active, and the former appeared to be more phytotoxic to the target species, including four weeds. A total of 26 compounds were isolated from leaves and roots, and four of them are described here for the first time. The major compounds in the leaf extract are the sesquiterpene lactones costunolide, reynosin, and santamarine, and these showed marked inhibition. Amaranthus viridis and Panicum maximum were the most sensitive species of the weeds tested. These three phytotoxic lactones were also evaluated on A. viridis and P. maximum under hydroponic conditions. A. viridis was the most affected species with the three lactones, and santamarine was the most phytotoxic compound on both. This is the first time that the phytotoxicity of sesquiterpene lactones has been evaluated on hydroponic culture. The work described here is a preliminary approach for the use of B. sulphurea for weed control in agriculture, both as a cover crop and by use of its components as natural herbicide leads.
[Mh] Termos MeSH primário: Bidens/química
Herbicidas/toxicidade
Extratos Vegetais/toxicidade
Plantas Daninhas/efeitos dos fármacos
[Mh] Termos MeSH secundário: Amaranthus/efeitos dos fármacos
Asteraceae/efeitos dos fármacos
Brasil
Herbicidas/química
Herbicidas/isolamento & purificação
Estrutura Molecular
Extratos Vegetais/química
Extratos Vegetais/isolamento & purificação
Folhas de Planta/química
Raízes de Plantas/química
Controle de Plantas Daninhas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Herbicides); 0 (Plant Extracts)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170707
[Lr] Data última revisão:
170707
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170613
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jafc.7b01922


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[PMID]:28419161
[Au] Autor:Ghorbani A; Saeedi Y; de Boer HJ
[Ad] Endereço:Department of Organismal Biology, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden.
[Ti] Título:Unidentifiable by morphology: DNA barcoding of plant material in local markets in Iran.
[So] Source:PLoS One;12(4):e0175722, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Local markets provide a rapid insight into the medicinal plants growing in a region as well as local traditional health concerns. Identification of market plant material can be challenging as plants are often sold in dried or processed forms. In this study, three approaches of DNA barcoding-based molecular identification of market samples are evaluated, two objective sequence matching approaches and an integrative approach that coalesces sequence matching with a priori and a posteriori data from other markers, morphology, ethnoclassification and species distribution. Plant samples from markets and herbal shops were identified using morphology, descriptions of local use, and vernacular names with relevant floras and pharmacopoeias. DNA barcoding was used for identification of samples that could not be identified to species level using morphology. Two methods based on BLAST similarity-based identification, were compared with an integrative identification approach. Integrative identification combining the optimized similarity-based approach with a priori and a posteriori information resulted in a 1.67, 1.95 and 2.00 fold increase for ITS, trnL-F spacer, and both combined, respectively. DNA barcoding of traded plant material requires objective strategies to include data from multiple markers, morphology, and traditional knowledge to optimize species level identification success.
[Mh] Termos MeSH primário: Código de Barras de DNA Taxonômico/métodos
DNA de Plantas/genética
Plantas Medicinais/anatomia & histologia
Plantas Medicinais/genética
[Mh] Termos MeSH secundário: Amaranthus
Núcleo Celular/genética
DNA de Cloroplastos/química
DNA de Cloroplastos/genética
DNA de Plantas/química
DNA Espaçador Ribossômico/química
DNA Espaçador Ribossômico/genética
Plantas Medicinais/classificação
RNA de Transferência/genética
Reprodutibilidade dos Testes
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Chloroplast); 0 (DNA, Plant); 0 (DNA, Ribosomal Spacer); 9014-25-9 (RNA, Transfer)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170522
[Lr] Data última revisão:
170522
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170419
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0175722


  9 / 626 MEDLINE  
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[PMID]:28414779
[Au] Autor:Ye J; Wen B
[Ad] Endereço:Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China.
[Ti] Título:Seed germination in relation to the invasiveness in spiny amaranth and edible amaranth in Xishuangbanna, SW China.
[So] Source:PLoS One;12(4):e0175948, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Both spiny and edible amaranths (Amaranthus spinosus and A. tricolor) are exotic annuals in China that produce numerous small seeds every year. Spiny amaranth has become a successful invader and a troublesome weed in Xishuangbanna, but edible amaranth has not, although it is widely grown as a vegetable there. As seed germination is one of the most important life-stages contributing to the ability of a plant to become invasive, we conducted experiments to compare the effects of high temperature and water stress on seed germination in two varieties each of spiny amaranth and edible amaranth. Overall, the seeds of both amaranth species exhibited adaptation to high temperature and water stress, including tolerance to ground temperatures of 70°C for air-dried seeds, which is consistent with their behavior in their native ranges in the tropics. As expected, the invasive spiny amaranth seeds exhibited higher tolerance to both continuous and daily periodic high-temperature treatment at 45°C, and to imbibition-desiccation treatment, compared to edible amaranth seeds. Unexpectedly, edible amaranth seeds exhibited higher germination at extreme temperatures (10°C, 15°C, and 40°C), and at lower water potential (below -0.6 MPa). It is likely that cultivation of edible amaranth has selected seed traits that include rapid germination and germination under stressful conditions, either of which, under natural conditions, may result in the death of most germinating edible amaranth seeds and prevent them from becoming invasive weeds in Xishuangbanna. This study suggests that rapid germination and high germination under stress conditions-excellent seed traits for crops and for many invasive species-might be a disadvantage under natural conditions if these traits are asynchronous with natural local conditions that support successful germination.
[Mh] Termos MeSH primário: Amaranthus/crescimento & desenvolvimento
Germinação/fisiologia
Plantas Daninhas/crescimento & desenvolvimento
Sementes/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Adaptação Fisiológica/fisiologia
Fenômenos Biológicos
China
Desidratação/fisiopatologia
Temperatura Alta
Espécies Introduzidas
Fenômenos Fisiológicos/fisiologia
Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
059QF0KO0R (Water)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170505
[Lr] Data última revisão:
170505
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170418
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0175948


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[PMID]:28405784
[Au] Autor:Bhide AJ; Channale SM; Yadav Y; Bhattacharjee K; Pawar PK; Maheshwari VL; Gupta VS; Ramasamy S; Giri AP
[Ad] Endereço:Plant Molecular Biology Unit, Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411 008, India.
[Ti] Título:Genomic and functional characterization of coleopteran insect-specific α-amylase inhibitor gene from Amaranthus species.
[So] Source:Plant Mol Biol;94(3):319-332, 2017 Jun.
[Is] ISSN:1573-5028
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The smallest 32 amino acid α-amylase inhibitor from Amaranthus hypochondriacus (AAI) is reported. The complete gene of pre-protein (AhAI) encoding a 26 amino acid (aa) signal peptide followed by the 43 aa region and the previously identified 32 aa peptide was cloned successfully. Three cysteine residues and one disulfide bond conserved within known α-amylase inhibitors were present in AhAI. Identical genomic and open reading frame was found to be present in close relatives of A. hypochondriacus namely Amaranthus paniculatus, Achyranthes aspera and Celosia argentea. Interestingly, the 3'UTR of AhAI varied in these species. The highest expression of AhAI was observed in A. hypochondriacus inflorescence; however, it was not detected in the seed. We hypothesized that the inhibitor expressed in leaves and inflorescence might be transported to the seeds. Sub-cellular localization studies clearly indicated the involvement of AhAI signal peptide in extracellular secretion. Full length rAhAI showed differential inhibition against α-amylases from human, insects, fungi and bacteria. Particularly, α-amylases from Helicoverpa armigera (Lepidoptera) were not inhibited by AhAI while Tribolium castaneum and Callosobruchus chinensis (Coleoptera) α-amylases were completely inhibited. Molecular docking of AhAI revealed tighter interactions with active site residues of T. castaneum α-amylase compared to C. chinensis α-amylase, which could be the rationale behind the disparity in their IC . Normal growth, development and adult emergence of C. chinensis were hampered after feeding on rAhAI. Altogether, the ability of AhAI to affect the growth of C. chinensis demonstrated its potential as an efficient bio-control agent, especially against stored grain pests.
[Mh] Termos MeSH primário: Amaranthus/metabolismo
Coleópteros/enzimologia
Inibidores Enzimáticos/metabolismo
Inibidores Enzimáticos/farmacologia
Regulação da Expressão Gênica de Plantas/fisiologia
Proteínas de Plantas/metabolismo
alfa-Amilases/antagonistas & inibidores
[Mh] Termos MeSH secundário: Achyranthes/metabolismo
Sequência de Aminoácidos
Animais
Celosia/metabolismo
Clonagem Molecular
Modelos Moleculares
Proteínas de Plantas/genética
Conformação Proteica
Transporte Proteico
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Enzyme Inhibitors); 0 (Plant Proteins); EC 3.2.1.1 (alpha-Amylases)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170414
[St] Status:MEDLINE
[do] DOI:10.1007/s11103-017-0609-5



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