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Allelopathic effects of aqueous and organic fractions of Euphorbia dracunculoides Lam. on germination and seedling growth of chickpea and wheat Chilean J. Agric. Res.
Tanveer,Asif; Kamran Jabbar,Muhammad; Kahliq,Abdul; Matloob,Amar; Nadeem Abbas,Rana; Mansoor Javaid,Muhammad.
Identification of weed species with allelopathic potential and characterization of their adverse effects against associated crops is required for better understanding of weed-crop interactions. Phytotoxic activity of Euphorbia dracunculoides Lam. on germination and seedling growth of chickpea (Cicer arietinum L.) and wheat (Triticum aestivum L.) was investigated under controlled conditions. Two separate studies were done with each of four organic solvent fractions (n-hexane, chloroform, ethylacetate, 1-butanol) and crude aqueous (1:10 and 1:20) whole plant fractions of E. dracunculoides using distilled water and 0.05% (v/v) dimethyl sulfoxide (DMSO) as control. Different aqueous and organic fractions of E. dracunculoides had a significant bearing on...
Tipo: Journal article Palavras-chave: Allelopathy; Weeds; Germination attributes; Suppression; Phenolics.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400006
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Antagonistic activity of bacteria from the chickpea rhizosphere against Fusarium oxysporum f.sp. ciceris. Repositório Alice
LANDA B.B.; HERVAS,A.; BETTIOL, W.; JIMENEZ-DIAZ, R.M..
The antagonistic activity against in vitro growth of Fusarium oxysporum f.sp. ciceris was determined for 74 bacterial isolates obtained from the rhizosphere of chickpeas grown in two field soils with different histories of Fusarium wilt, and for seven isolates of Pseudomonas spp. from culture collections. Twenty-four isolates of Bacillus spp. and Pseudomonas chlororaphis 30-84 showed a strong antagonism against three races (0, 1 and 5) of F.o. ciceris tested. Three selected Bacillus isolates and P. chlororaphis 30-84 were further tested against 30 isolates of races 0, 1 and 5 of F.o ciceris, races 0,1 and 2 of F.o. melonis, F.o. Phaseoli and nonpathogenic F. oxysporum. Bacillus isolates differed in their antagonistic activity and were less inhibitory to...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Biological control; Cicer arietinum; Fluorescent pseudomonas; Antagonism; Plant disease; Specificity; Suppression; Statistical analysis.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/12764
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Cover Crops in the Weed Management in Soybean Culture Planta Daninha
SÃO MIGUEL,A.S.D.C.; PACHECO,L.P.; SOUZA,E.D.; SILVA,C.M.R.; CARVALHO,Í.C..
ABSTRACT: The objective of this work was to evaluate the effect of cover crops on weed suppression in no-tillage soybean production systems in Rondonopolis, Mato Grosso. The experiment was carried out in an experimental area and consisted of the evaluation of nine cover treatments and soil management in a randomized complete block design. The treatments were: NT fallow, CT fallow, Crotalaria spectabilis, Crotalaria breviflora, maize + Crotalaria spectabilis, Pennisetum glaucum, Urochloa ruziziensis, Cajanus cajan, sunflower + Urochloa ruziziensis, Stylosanthes, Vigna unguiculata, Urochloa brizantha, maize + Urochloa ruziziensis. The evaluations were carried out before the desiccation for soybean sowing in the crops (10/23/2014) and (09/21/2015), before the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; No-till system; Weed community; Suppression.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100271
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Cutting the Nomenclatural Gordian Knot around Pyrgus Carthami (Hübner) (Lepidoptera: Hesperiidae) Naturalis
Jong, R. de.
The name Papilio fritillarius Poda, 1761, is shown to be a nomen dubium. It has caused much confusion and has been applied to five or six different species since the first publication and to three different species in the last 40 years. To put an end to the confusion a neotype is designated. For the neotype a specimen has been selected of the species currently known as Pyrgus malvae (Linnaeus), thus making Papilio fritillarius Poda, 1761, a junior subjective synonym of Papilio malvae Linnaeus, 1758. Consequently, Poda's name can no longer be used for the species named Papilio carthami by Hübner, [1813] and now currently placed in the genus Pyrgus. The same species was named Papilio malvae maior by Fabricius (1787) and for reasons of priority Hübner's name...
Tipo: Article / Letter to the editor Palavras-chave: Nomenclature; Neotype; Suppression; Hesperiidae; Pyrgus; Fritillarius; Carthami; Maior; Malvae; 42.75.
Ano: 1987 URL: http://www.repository.naturalis.nl/record/318342
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Effect of crop residues applied isolated or in combination on the germination and seedling growth of horse purslane (Trianthema portulacastrum) Planta Daninha
Khaliq,A.; Matloob,A.; Farooq,M.; Mushtaq,M.N.; Khan,M.B..
Soil incorporation of crop residues can lead to weed suppression by posing allelopathic and physical effects. Allelopathic potential of the crops sorghum, sunflower, brassica applied as sole or in combination for horse purslane (Trianthema portulacastrum) suppression was evaluated in a pot investigation. Chopped crop residues alone and in combination were incorporated at 6 g kg-1 soil (12 t ha-1), and a weedy check was maintained. Germination traits time to start germination; time to 50% emergence, mean emergence time, emergence index and final germination percentage were negatively influenced by residue incorporation. Crop residues also exerted a pronounced negative influence on the shoot and root length of horse purslane. Significant suppression in leaf...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Residues; Allelopathic; Sorghum; Sunflower; Brassica; Trianthema portulacastrum; Germination/seedling growth; Suppression.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000100014
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In vitro bacterial plaque suppression and recolonization by S. mutans and S. sobrinus BJM
Pereira,Cássio Vicente; Pereira,Luciano José; Gonçalves,Reginaldo Bruno; Höfling,José Francisco.
The in vitro study of the interactions between S. mutans and S. sobrinus is important to determine the role of these microorganisms in the formation of biofilms on dental structures and their potential to induce carious lesions. The objective of this research was to study the suppression of bacterial plaque formation and its recolonization by rifampycin-resistant S.mutans and streptomycin-resistant S. sobrinus. To study the competitive relationship between these species, previously standardized strains were incubated in media containing different fermentable carbohydrates. At determined time intervals, samples were collected from mixed cultures of S. mutans and S. sobrinus, diluted and plated on BHI-agar containing rifampycin or streptomycin to determine...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Streptococcus mutans; Streptococcus sobrinus; Suppression.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822006000100004
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Interruption of recently induced immune responses by oral administration of antigen BJMBR
Conde,A.A.; Stransky,B.; Faria,A.M.C.; Vaz,N.M..
Interest in oral tolerance has been renewed in the last few years as a possibility of intervention in human autoimmune diseases. An obstacle in this direction is that, although easily induced in animals virgin of contact with the antigen, oral tolerance becomes hard to induce in previously immunized animals. The present results show that there is an early period after primary immunization in which prolonged oral exposure to the antigen may arrest ongoing immune responses. Beyond this period, oral exposures to the antigen become ineffective and may actually boost immune responses. The end of the susceptible period coincides with the emergence of free specific antibodies in serum. However, the previous administration of purified anti-ovalbumin antibodies (40...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Suppression; Antibody response; Oral tolerance; Ovalbumin.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000300008
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Plasticity of neutrophils reveals modulatory capacity BJMBR
Perobelli,S.M.; Galvani,R.G.; Gonçalves-Silva,T.; Xavier,C.R.; Nóbrega,A.; Bonomo,A..
Neutrophils are widely known as proinflammatory cells associated with tissue damage and for their early arrival at sites of infection, where they exert their phagocytic activity, release their granule contents, and subsequently die. However, this view has been challenged by emerging evidence that neutrophils have other activities and are not so short-lived. Following activation, neutrophil effector functions include production and release of granule contents, reactive oxygen species (ROS), and neutrophil extracellular traps (NETs). Neutrophils have also been shown to produce a wide range of cytokines that have pro- or anti-inflammatory activity, adding a modulatory role for this cell, previously known as a suicide effector. The presence of cytokines almost...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Autoimmunity; Cancer; Infection; Inflammation; Neutrophil; Suppression.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000800665
Registros recuperados: 8
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