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Registros recuperados: 12
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Activity of Antioxidant Enzymes in Euphorbia heterophylla Biotypes and their Relation to Cross Resistance to ALS and Protox Inhibitors Planta Daninha
XAVIER,E.; TREZZI,M.M.; OLIVEIRA,M.C.; VIDAL,R.A.; BRUSAMARELLO,A.P..
ABSTRACT: The characteristics of multiple resistance in Euphorbia heterophylla biotypes to herbicides that are inhibitors of ALS (Acetolactate synthase) and PPO (Protoporphyrinogen oxidase) and their responsible mechanisms are still not completely elucidated. The objectives of this study were to identify cross-resistance to herbicides from different chemical groups of ALS inhibitors (imidazolinones, sulfonylureas, pyrimidyl benzoates and sulfonanilides) and also PPO inhibitors (diphenylethers, phthalamides, oxadiazoles, triazolinones and pyrimidinediones) in E. heterophylla biotypes with multiple resistance to these herbicides; to analyze whether the antioxidant enzymes superoxide dismutase (SOD) and peroxidase (POD) constitute mechanisms that are...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dose-response curves; Superoxide dismutase; Peroxidase; Acetolactate synthase; Protoporphyrinogen oxidase.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100340
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AN INNOVATIVE METHOD TO EVALUATE THE IMPACT OF TEMPERATURE ON IODOSULFURON-METHYL SELECTIVITY TO OAT CROP Planta Daninha
VIDAL,R.A.; FIPKE,M.V.; QUEIROZ,A.R.S.; SOARES,D.S.; GHEREKHLOO,J..
ABSTRACT Temperature affects the selectivity of post-emergence herbicides in a complex manner. The objective of this work was to develop a method to estimate the impact of temperature on herbicide selectivity using the white oat (Avena sativa) crop and iodosulfuron-methyl as study models. Greenhouse/growth-chamber experiments were conducted using a completely randomized design with the treatments arranged as a bi-factorial, with three repetitions. The first factor consisted of six temperatures (10, 15, 20, 24, 28 and 32 oC) to which the plants were submitted during one week after the herbicide spray. The second factor corresponded to seven doses of iodosulfuron-methyl (0, 0.2, 0.4, 0.8, 1.2, 5 and 20 g ha-1). For each temperature, regression curves were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Avena sativa; Crop tolerance; Environmental factors; Herbicide detoxification.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100246
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Bioassay for Determining Persistence of the Herbicide Saflufenacil in an Oxisol Planta Daninha
DIESEL,F.; TREZZI,M.M.; VIDAL,R.A.; BARANCELLI,M.V.J.; MIZERSKI,P.H.F..
ABSTRACT: Persistence of an herbicide is defined as the ability to maintain the integrity of its molecule and chemical, physical, and phytotoxic properties in the environment where it was applied. Knowledge of persistence has implications both for the toxicity generated on species grown in succession and for the period in which the herbicide controls weeds. This study aimed to assess the persistence of the herbicide saflufenacil in an Oxisol by means of bioassays. Two experiments with the application of 29.4 g ha-1 of saflufenacil were carried out under field conditions: the first in the 2011/2012 season and the second in the 2012/2013 season. Soil samples were collected at depths of up to 10 cm at different times after application. Subsequently, two...
Tipo: Info:eu-repo/semantics/article Palavras-chave: PROTOX inhibitor; Cucumis sativus L.; Beta vulgaris L.; Residual effect.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100250
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Characterization of Ethoxysulfuron Herbicide Selectivity in Common Bean Cultivars Planta Daninha
PAGNONCELLI JR,F.B.; VIDAL,R.A.; TREZZI,M.M.; GALLON,M.; BRUSAMARELLO,A.P..
ABSTRACT: In literature, there are few studies evaluating the response of different bean cultivars to herbicides, particularly the ALS enzyme inhibitors. The objective of this study was to evaluate the selectivity of common bean cultivars to the herbicide ethoxysulfuron and to select cultivars that are more tolerant to it. An experiment was conducted in a greenhouse, in a completely randomized experimental design with four replications. Factors consisted in 20 bean cultivars (IPR Eldorado, IPR Siriri, IPR Gralha, IPR 81, IPR Uirapuru, IPR Colibri, IPR Tuiuiú, BRS Esplendor, IPR Tangará, IPR Juriti, IPR Corujinha, IPR Andorinha, IPR Curió, BRS Campeiro, BRS Pérola, BRS Notável, BRS Estilo, UTF 3, UTF 5 e UTF 6), and four doses of ethoxysulfuron (0, 50, 100...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phaseolus vulgaris; Sulfonylureas; Tolerance; GGE biplot.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100311
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Evolution of Natural Resistance to Glyphosate in Morning Glory Populations Planta Daninha
PAZUCH,D.; TREZZI,M.M.; GUIMARÃES,A.C.D.; BARANCELLI,M.V.J.; PASINI,R.; VIDAL,R.A..
ABSTRACT Tolerance, also referred to as natural resistance, is a feature that exists in the plant even before herbicide application in an area. I. grandifolia, I. indivisa and I. purpurea are among the tolerant species most commonly found over fields in southern Brazil. We hypothesized that the intensive use of glyphosate results in increasing levels of tolerance to glyphosate, and in pronounced response variability in populations of the same Ipomoea species. This study aimed at identifying tolerance variations to glyphosate among I. grandifolia, I.indivisa and I. purpurea morning glory species and among populations of these species. In crops over Paraná and Santa Catarina states (Brazil) 31 biotypes were collected (20I. grandifolia, 7I.indivisa and 4I....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tolerance; Ipomoea grandifolia; Ipomoea indivisa; Ipomoea purpurea; Control; Dose-response.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100205
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FLUAZIFOP-P-BUTYL EFFICACY AS A FUNCTION OF APPLICATION TIME AND HERBICIDE DOSE Planta Daninha
CIESLIK,L.F.; VIDAL,R.A.; MACHADO,A.B.; TREZZI,M.M..
ABSTRACT Grass weeds are common in summer crops and strongly decreases the grain yield of the common bean crop. The time of herbicide application influences the variability of environmental conditions and affects the product performance. The objectives of this work were to identify the time of fluazifop-p-butyl (fluazifop) application which gives best grass weed control in the common bean crop and to elucidate the environmental variables most important for the efficacy of this herbicide. Field experiments were conducted involving five application times (2 a.m., 6 a.m., 11 a.m., 4 p.m. and 9 p.m.) and five doses of fluazifop (80, 110, 140, 170 and 200 g ha-1), with additional no-herbicide control. At the time of the herbicide application it was determined...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chemical control; Environmental conditions; Leaf angle; Conceptual map.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100219
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Influence of Density and Development Stage of Ryegrass on Glyphosate Effectiveness Planta Daninha
FIPKE,M.V.; VIDAL,R.A..
ABSTRACT : Glyphosate is one of the main herbicides used to control ryegrass. The objective of this research was to evaluated whether the glyphosate dose-response curve is affected by density of ryegrass plants in two phenological growth stages. To attend this objective, two experiments were carried out in greenhouse (one with Lolium multiflorum and another with Lolium rigidum) and two under field conditions. In the greenhouse experiments, the experimental design was a completely randomized design in a factorial scheme, with factor A as plant density and factor B as glyphosate doses. In the field, two experiments were carried out in a randomized block design in a split-plot scheme. Plots consisted of glyphosate doses (0, 40, 80, 120, 160, 250, and 350 g...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lolium multiflorum L.; Lolium rigidum; Time of application; Tolerance.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100224
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Integrative Theory of the Mode of Action of Quinclorac: Literature Review1 Planta Daninha
FIPKE,M.V.; VIDAL,R.A..
ABSTRACT Quinclorac is a systemic herbicide absorbed by germinating seeds, roots and leaves of seedlings. It is a selective compound for crops such as rice, canola, barley, corn, sorghum, and pasture. Quinclorac can be used to control various monocots and dicotyledonous weed species. The biochemical function of this herbicide in the plant has intrigued scientists for nearly four decades. The objectives of this review are to present evidence of three hypotheses on the biochemical functioning of quinclorac and to propose an integrative mode of action. The first theory on the mode of action of quinclorac is supported by evidence of inhibition of incorporation of C14-glucose into cellulose and hemicellulose, thus, affecting the cell wall synthesis. The second...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cellulose biosynthesis-inhibitor; Cyanide; Auxinic herbicide; Reactive oxygen species.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000200393
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Prospección de las combinaciones de herbicidas para prevenir malezas tolerantes y resistentes al glifosato Planta Daninha
VIDAL,R.A.; RAINERO,H.P.; KALSING,A.; TREZZI,M.M..
El intenso empleo de glifosato contribuyó a la difusión de malezas con tolerancia a este herbicida, incluyendo especies como Ipomoea nil, bejuco en Argentina, o corriola, o corda-de-viola en Brasil. A su vez, el uso intensivo de imadozolinonas en ciertas regiones de Argentina contribuyó a la aparición de biotipos resistentes a herbicidas que actúan inhibiendo la enzima ALS como Amaranthus quitensis, yuyo colorado o ataco, conocido como carurú en Brasil. En ese país, también, aumentó la difusión de malezas con resistencia a glifosato como en Euphorbia heterophylla, leiteiro o amendoim-bravo y en Lolium multiflorum, azevém. El objetivo de esta investigación fue evaluar el antagonismo o el sinergismo de todas las combinaciones posibles entre dos de los...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tolerancia; Resistencia; Glifosato; Sinergismo; Antagonismo.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000100019
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QUALITY OF PROCESSING TOMATO FRUITS IN COMPETITION WITH Solanum americanum Planta Daninha
PORTUGAL,J.; REGO,F.C.; MOREIRA,I.; VIDAL,R.A..
ABSTRACT Five experiments were conducted to evaluate the hypothesis that Solanum americanum density and time of coexistence affect the quality of processing tomato fruit. The tomato crop was established using either the direct drilling or the transplanting technique. The factors evaluated consisted of weed density (from 0 up to 6 plants m-2) and time of weed interference (early bloom stage, full flowering stage, fruit filling, and harvest time). The effects of competition on tomato fruit quality were analysed using a multiple model. Tomato variables evaluated included industrial fruit types (which depended on ripeness and disease infection) and soluble solids level(obrix). Tomato fruit quality is dependent on the factors tested. Under low densities (< 6...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Weed competition; Critical period; Density-dependent processes; Threshold.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000400689
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Rendimento de grãos de feijão e nível de dano econômico sob dois períodos de competição com Euphorbia heterophylla Planta Daninha
MACHADO,A.B.; TREZZI,M.M.I; VIDAL,R.A.; PATEL,F.; CIESLIK,L.F.; DEBASTIANI,F..
O objetivo deste estudo foi avaliar o impacto da interferência de Euphorbia heterophylla (EPHHL) em diferentes densidades e épocas de semeadura sobre o rendimento do feijoeiro e seus componentes e o nível de dano econômico (NDE). O experimento foi conduzido em campo em delineamento de blocos ao acaso, em parcelas subdivididas, com quatro repetições. Nas parcelas principais foram alocadas oito densidades de EPHHL (0, 6, 10, 17, 29, 49, 83 e 142 pl m-2) e, nas subparcelas, duas épocas de semeadura da infestante (12 dias antes da semeadura do feijoeiro e simultaneamente à cultura). As perdas de rendimento da cultura do feijão foram diretamente proporcionais à densidade de plantas de EPHHL. A implantação simultânea das espécies cultivada e daninha resultou em...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Competição; Phaseolus vulgaris; Perda de rendimento; Nível crítico de dano; Hipérbole retangular.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000100041
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TOLERANCE OF COMMON BEAN PLANTS TO ETHOXYSULFURON HERBICIDE AND THE MECHANISM INVOLVED IN THE PROCESS Planta Daninha
PAGNONCELLIJR.,F.D.B.; VIDAL,R.A.; TREZZI,M.M.; MACHADO,A.; GALLON,M.; XAVIER,E.; OLIVEIRA,M.C..
ABSTRACT The objectives of this study were to determine the effect of herbicide ethoxysulfuron on the development of commom bean (Phaseolus vulgaris), to evaluate the impact of the herbicide on the crop grain yield and to determine the mechanism of tolerance of common bean to ethoxysulfuron. Field experiments were carried out with several doses of ethoxysulfuron to determine its effect on the grain yield of two varieties of common bean ("IPR Andorinha", "IPR Tangará"). The mechanism of plant tolerance was evaluated through several methods, including the analysis of the ALS enzyme sensitivity to herbicide and the use of P450 inhibitors (the insecticides malathion + chlorpyrifos) and the use of antidote (mefenpyr-diethyl). When the rate of ethoxysulfuron was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phaseolus vulgaris; Crop grain yield; ALS enzyme; Detoxification.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000300535
Registros recuperados: 12
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