Consulta: subjectFacets:"Herbicide resistance"
Registros recuperados: 31
Data/hora: 04/06/2024 05:20:36

One-step, codominant detection of imidazolinone resistance mutations in weedy rice (Oryza sativa L.)
Provedor de dados: 69
Autores: Rosas,Juan E; Bonnecarrère,Victoria; Pérez de Vida,Fernando.
Background Weedy rice (Oryza sativa L.) is a noxious form of cultivated rice (O. sativa L.) associated with intensive rice production and dry seeding. A cost-efficient strategy to control this weed is the Clearfield rice production system, which combines imidazolinone herbicides with mutant imidazolinone-resistant rice varieties. However, imidazolinone resistance mutations can be introgressed in weedy rice populations by natural outcrossing, reducing the life span of the Clearfield technology. Timely and accurate detection of imidazolinone resistance mutations in weedy rice may contribute to avoiding the multiplication and dispersion of resistant weeds and to protect the Clearfield system. Thus, highly sensitive and specific methods with high throughput...
Tipo: Journal article
Palavras-chave: Clearfield rice; DNA-based resistance diagnosis; Herbicide resistance; KASP; Red rice; SNP.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000200007

RESISTÊNCIA nas lavouras de soja: já parou para pensar no tamanho desse problema?
Provedor de dados: 14
Informação é a chave para a tomada de decisão! Plantas daninhas resistentes a herbicidas. Ferrugem da soja resistentes a fungicidas. Resistência de pragas a inseticidas.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Soja; Doença de planta; Praga de planta; Erva daninha; Resistência a produtos químicos; Soybeans; Pesticide resistance; Plant pests; Plant diseases and disorders; Fungicide resistance; Herbicide resistance; Insecticide resistance.
Ano: 2012
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/915961

Euphorbia heterophylla: um novo caso de resistência ao glifosato no Brasil.
Provedor de dados: 14
Autores: ADEGAS, F. S.; GAZZIERO, D. L. P.; OLIVEIRA JUNIOR, R. S. de; MENDES, R. R.; RODRIGUES, L. J.
bitstream/item/211648/1/ComTec-98.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Herbicida; Resistência a Produtos Químicos; Euphorbia Heterophylla; Herbicide resistance.
Ano: 2020
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1121045

Bioassay for detection of transgenic soybean seeds tolerant to glyphosate
Provedor de dados: 86
Autores: Torres,Antonio Carlos; Nascimento,Warley Marco; Paiva,Sonia Alessandra Vasconcelos; Aragão,Fernando Antonio Souza de.
Glyphosate is a systemic, nonselective, postemergence herbicide that inhibits growth of both weeds and crop plants. Once inside the plant, glyphosate interferes with biosynthesis of aromatic amino acids phenylalanine, tyrosine, and tryptophan, by inhibiting the activity of 5enolpyruvylshikimate-3-phosphate synthase (EPSPS), a key enzyme of the shikimate pathway. The objective of this work was to develop a simple, effective and inexpensible method for identification of transgenic soybean tolerant to glyphosate. This technique consisted in germinating soybean seeds in filter paper moistened with 100 to 200 muM of glyphosate. Transgenic soybean seeds tolerant to glyphosate germinated normally in this solution and, between 7 and 10 days, started to develop a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Herbicide resistance; Transgenic plants; Biosynthesis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000900005

Spatial and temporal evolution of imidazolinone-resitant red rice in 'Clearfield' rice cultivations
Provedor de dados: 86
Autores: Kalsing,Augusto; Goulart,Ives Clayton Gomes dos Reis; Mariot,Carlos Henrique Paim; Menezes,Valmir Gaedke; Matzenbacher,Felipe de Oliveira; Merotto Junior,Aldo.
Abstract: The objective of this work was to evaluate the distribution of imidazolinone-resistant (IMI-R) red rice (Oryza sativa) populations, the frequency of alleles conferring resistance to IMI, and the adoption of agronomic practices applied to red rice control, across growing seasons and production regions of the state of Rio Grande do Sul (RS), Brazil. In the experiment, 1,008 red rice populations were screened for resistance to IMI, 760 IMI-R red rice plants were genotyped for the acetolactate synthase (ALS) alleles conferring resistance to IMI, and 40 'Clearfield' rice growers were surveyed. IMI-R red rice populations were widespread throughout RS since the 2006/2007 growing season, with a higher initial frequency in the Depressão Central and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Gene flow; Herbicide resistance; Weedy rice.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102503

Assessing Genetic Variation and Spread of Phalaris minor Resistant to ACCase Inhibiting Herbicides in Iran
Provedor de dados: 87
Autores: GHEREKHLOO,J.; ALCÁNTARA-DE LA CRUZ,R.; OSUNA,M.D.; SOHRABI,S.; PRADO,R.
ABSTRACT: Littleseed canarygrass (Phalaris minor) is the second most serious and problematic grass weed in wheat fields in Iran, and has developed resistance to ACCase inhibiting herbicides. Inter-simple sequence repeat (ISSR) analysis was used to assess genetic variation between and within ACCase inhibitor-resistant and susceptible P. minor populations in Iran and to determine the origin of resistance and its dispersal. Sixteen P. minor populations from different regions in Iran were analysed using seven primers. Genetic relationships generated using UPGMA analysis indicated the presence of more than one genotype among the herbicide resistant populations. The results indicated that the high genetic similarity and physical proximity among the resistant P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dendrogram; Herbicide resistance; ISSR; Genotype; UPGMA.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100226

Globe fringerush (Fimbristylis miliacea) cross resistance to als-inhibitor herbicides under field conditions in irrigated rice in the south of Brazil
Provedor de dados: 87
Autores: Schaedler,C.E.; Noldin,J.A.; Eberhardt,D.S.; Agostinetto,D.; Burgos,N.R.
ALS-inhibiting herbicides usually provide adequate weed control in irrigated rice fields. After consecutive years of use, the Cyperaceae species, globe fringerush (Fimbristylis miliacea) began to show resistance to ALS (acetolactate synthase) inhibitors. Globe fringerush is one of the most problematic herbicide-resistant weeds in irrigated rice in the state of Santa Catarina in the South of Brazil. The objective of this research was to examine cross resistance of globe fringerush to ALS inhibitors, under field conditions. Two experiments were conducted in a rice field naturally infested with ALS-resistant globe fringerush in Santa Catarina, in the 2008/09 and 2009/10 cropping seasons. The experimental units were arranged in randomized complete block...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paddy rice; Oryza sativa; Herbicide resistance; Acetolactate synthase.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400016

Germination and growth of Fimbristylis miliacea biotypes resistant and susceptible to acetolactate synthase-inhibiting herbicides
Provedor de dados: 87
Autores: Schaedler,C.E.; Noldin,J.A.; Agostinetto,D.; Dal Magro,T.; Fontana,L.C.
Weed biotypes resistant and susceptible to herbicides may have differences in their adaptive values. The aims of this study were to compare, under controlled and non-competitive condition, the growth analysis, germination features and seed weight of Fimbristylis miliacea (FIMMI) biotypes resistant and susceptible to acetolactate synthase (ALS) inhibiting herbicides. Experiments were conducted in a greenhouse and in a laboratory from October 2008 to February 2010. Two resistant biotypes (FIMMI 10 and FIMMI 12) and one susceptible biotype (FIMMI 13) were used for the studies. For the study on growth analysis, the treatments were arranged in a completely randomized experimental design with four replications and sampled at 21, 28, 35, 42, 49, 56, 69 days after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paddy rice; Globe fringerush; Oryza sativa; Herbicide resistance.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000300020

Comparison of Sensitivity to Glyphosate of Euphorbia davidii Populations
Provedor de dados: 87
Autores: NÚÑEZ FRÉ,F.R.; JUAN,V.F.; YANNICCARI,M.; SAINT ANDRÉ,H.M.; FERNANDEZ,R.R.
ABSTRACT: Euphorbia davidii (Euphorbiaceae) is a summer annual weed present in the Province of Buenos Aires, Argentina. The aim of this study was to compare the sensitivity to glyphosate of different populations of Euphorbia davidii. Two techniques were used: a seed bioassay and shikimate determination in glyphosate-treated plants. Germination rates of seeds belonging to the populations from Espartillar, Barrow, Olavarria and Azul exposed to different concentrations of glyphosate were compared. Plants from the same locations treated with glyphosate were evaluated to determine shikimate levels. The most sensitive population was from Espartillar, with a CE50 (average effective concentration) of 4.00 g e.a. L-1. Based on this finding, the resistance index for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide resistance; Germination; Bioassay; Shikimate; EUDA5.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100209

Evaluation of Fenoxaprop-P-Ethyl Resistant Littleseed Canarygrass (Phalaris minor) in Pakistan
Provedor de dados: 87
Autores: ABBAS,T.; NADEEM,M.A.; TANVEER,A.; AHMAD,R.
ABSTRACT To test resistance status of Phalaris minor (littleseed canary grass) to fenoxaprop-P-ethyl in Pakistan, a field survey was conducted during 2014. Uncontrolled P. minor plants were selected for seed collection from wheat fields where fenoxaprop-P-ethyl was used to control P. minor. Seeds were collected from eight different locations near Fasialabad, Pakistan. Susceptible plants were also selected near Faisalabad having no history of fenoxaprop-P-ethyluse for comparison. These seeds were grown in pots for resistance confirmation using completely randomized design with factorial arrangement having four replicates. Four doses of fenoxaprop-P-ethylcontrol (0X), 46.9 (0.5X), 93.7 (1X) and 187 (2X) g a.i. ha-1 were sprayed at 3 to 4 leaf stage of P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ACCase-inhibiter; LD50; Phalaris minor; Herbicide resistance; Resistance index; Survey.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400833

Glyphosate Resistance Affect the Physiological Quality of Conyza bonariensis seeds
Provedor de dados: 87
Autores: PIASECKI,C.; MAZON,A.S.; AGOSTINETTO,D.; VARGAS,L.
ABSTRACT: High seed production and dispersal capacity and glyphosate resistance are among the main factors that have made hairy fleabane (Conyza bonariensis) one of the most important and dispersed weeds in the world. Herbicide-resistant weeds populations may have fitness cost due to molecular, physiological, and biochemical changes. This study aimed to evaluate the physiological quality of seeds of Conyza spp. and determine whether glyphosate resistance causes fitness costs for resistant biotypes. Seeds from six hairy fleabane biotypes, three glyphosate-resistant and three -sensitive, with a resistance factor average of 11.7 were studied. Among the studied biotypes, five were identified as C. bonariensis and one as C. blakei. Seed analyses were performed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide resistance; Integrated weed management; Weed biology; Soil seed bank; Conyza blakei.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100157

Dose-response curves of Lolium multiflorum biotypes resistant and susceptible to clethodim
Provedor de dados: 87
Autores: Vargas,L.; Fraga,D.S.; Agostinetto,D.; Mariani,F.; Duarte,T.V.; Silva,B.M.
Chemical control with herbicides, especially glyphosate, is the main method used to control ryegrass. However, the repeated use of glyphosate has selected resistant ryegrass biotypes. Thus, the ACCase inhibitor herbicides have become the main alternative to control glyphosate-resistant biotypes, being widely used by farmers in Rio Grande do Sul. Repeated use of ACCase inhibitors, in turn, have selected ryegrass biotypes resistant to this herbicide mechanism. Thus, the objective of this study was to evaluate the response of ryegrass biotypes to different clethodim rates by dose-response curves. Increasing doses (0, 12, 24, 48, 72, 96, 144 and 192 g a.i. ha-1) of the herbicide clethodim were applied at the 3-4 ryegrass leaf stage. The variables control at 14...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ryegrass; Cyclohexanodiones; Herbicide resistance.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400015

A Rapid Phenotyping Method for Imazamox Resistance in Wheat
Provedor de dados: 87
Autores: BRECCIA,G.; BISIO,M.B.; PICARDI,L.; NESTARES,G.
ABSTRACT: The availability of imidazolinone (IMI) resistant cultivars has provided an effective option for weed control in wheat production systems. IMI herbicides control several weeds, including Avena fatua and Lolium multiflorum, which are the most frequent grass weeds in wheat crops of the Argentine Pampas. The aim of this study was to develop a soil-less method that allows rapid phenotyping of IMI resistance in wheat. Nine wheat cultivars differing in IMI resistance were evaluated through a between-paper germination method. Herbicide concentrations required to reduce shoot and root length by 50% for resistant cultivars were &gt; 75 fold that of the susceptible cultivars. The response of resistant and susceptible commercial cultivars was assessed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Imidazolinone; Herbicide resistance; Germination test; Triticum aestivum L.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100344

Ammonium Glufosinate Associated with Post-Emergence Herbicides in Corn with the cp4-epsps and Pat Genes
Provedor de dados: 87
Autores: KRENCHINSKI,F.H.; CESCO,V.J.S.; CASTRO,E.B.; CARBONARI,C.A.; VELINI,E.D.
ABSTRACT: With the possibility of using ammonium glufosinate in corn, studies on its association with other herbicides are essential. The aim of this study was to assess weed control and herbicide selectivity in association with ammonium glufosinate in corn containing the pat and cp4-epsps genes. The experiment was carried out under field conditions in two sites in a randomized block design with four replications. Treatments consisted of ammonium glufosinate, glyphosate, ammonium glufosinate + glyphosate, ammonium glufosinate + nicosulfuron, ammonium glufosinate + atrazine, ammonium glufosinate + tembotrione, ammonium glufosinate + mesotrione, ammonium glufosinate + carfentrazone ethyl, ammonium glufosinate + bentazon, ammonium glufosinate + 2,4-D, control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia accumulation; Phosphinothricin; Electron transport rate; Herbicide resistance; Zea mays.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100241

Barnyardgrass with Multiple Resistance to Synthetic Auxin, ALS and Accase Inhibitors
Provedor de dados: 87
Autores: EBERHARDT,D.S.; OLIVEIRA NETO,A.M.; NOLDIN,J.A.; VANTI,R.M.
ABSTRACT The objective of this research was to confirm the resistance of a barnyardgrass biotype (Echinochloa crus-galli) to herbicides quinclorac (synthetic auxin), penoxsulam (ALS inhibitor) and cyhalofop-butyl (ACCase inhibitor). Two experiments were carried out in a greenhouse located in Itajaí, State of Santa Catarina, Brazil. One experiment evaluating the biotype ECH 18 (known as susceptible) and one with the ECH 141 biotype (suspected to be multiple resistant). The experimental design used was completely randomized, in a 4 x 7 factorial arrangement with four replications. The first factor was the herbicide: cyhalofop-butyl (Clincher(r)), penoxsulam (Ricer(r)), quinclorac (Facet(r)) and propanil (Grassaid(r)) and the second factor consisting of seven...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paddy rice; Echinochloa crus-galli; Chemical control; Herbicide resistance.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400823

Competitiveness of ALS inhibitors resistant and susceptible biotypes of Greater Beggarticks (Bidens subalternans)
Provedor de dados: 87
Autores: Lamego,F.P.; Vidal,R.A.; Burgos,N.R.
The continuous use of ALS-inhibiting herbicides has led to the evolution of herbicide-resistant weeds worldwide. Greater beggarticks is one of the most troublesome weeds found in the soybean production system in Brazil. Recently, a greater beggarticks biotype that is resistant (R) to ALS inhibitors due to Trp574Leu mutation in the ALS gene was identified. Also, the adaptive traits between susceptible (S) and R to ALS inhibitors biotypes of greater beggarticks were compared. Specifically, we aimed to: (1) evaluate and compare the relative growth rates (RGR) between the biotypes; (2) analyze the seed germination characteristics of R and S biotypes under different temperature conditions; and (3) evaluate their competitive ability in a replacement series...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bidens; Fitness; Herbicide resistance; Replacement series.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000200024

INFLUENCE OF GLYPHOSATE ON SUSCEPTIBLE AND RESISTANT RYEGRASS POPULATIONS TO HERBICIDE
Provedor de dados: 87
Autores: PICOLI JR,G.J.; CARBONARI,C.A.; MATOS,A.K.A.; RODRIGUES,L.F.O.S.; VELINI,E.D.
ABSTRACT In Brazil, ryegrass (Lolium multiflorum) has been identified as resistant to glyphosate, becoming a major problem, especially in crops cultivated in the winter season. This herbicide can indirectly affect photosynthesis by inhibiting biosynthesis of many compounds. Thus, the aim of this study was to investigate the influence of glyphosate on the physiological profile of susceptible and resistant ryegrass populations to the herbicide. The experimental design was completely randomized with two treatments (720 and 1,080 g e.a. ha-1) and four replications plus control with no treatment. Two ryegrass populations were sown, one susceptible and another one resistant to glyphosate. After the treatments, evaluations were carried out at 1, 3, 7 and 28 days...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide resistance; Photosynthesis; Lolium multiflorum.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100253

MULTIPLE RESISTANCE OF Sagittaria montevidensis BIOTYPES TO ACETOLACTATE SYNTHASE AND PHOTOSYSTEM II INHIBITING HERBICIDES
Provedor de dados: 87
Autores: MOURA,D.S.; NOLDIN,J.A.; GALON,L.; SCHREIBER,F.; BASTIANI,M.O.
ABSTRACT The objective of this research was to evaluate the occurance of multiple resistance of Sagittaria montevidensis (SAGMO) biotypes to acetolactate synthase (ALS) and photosystem II (PSII) inhibiting herbicides through dose-response experiments. The experiment was conducted in a greenhouse from October 2012 to March 2013, in Pelotas, RS. The experimental design was completely randomized, with four replications. Treatments were arranged in a triple factorial design: two biotypes of S. montevidensis(SAGMO 35 - susceptible to herbicides and SAGMO 32 - suspected to be multiple resistance to ALS and PSII inhibiting herbicides), four herbicides (penoxsulam, (imazethapyr+imazapic), bentazon and saflufenacil) and 8 rates of these herbicides (1/32x, 1/16x,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: California arrowhead; Oryza sativa; Water-seeded rice; Herbicide resistance; Chemical control; Ricer(r); Only(r); Basagran(r); Heat(r).
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000400779

A Dynamic Decision Model of Technology Adoption under Uncertainty: Case of Herbicide-Resistant Rice
Provedor de dados: 31
Autores: Annou,   Mamane Malam; Wailes,   Eric J.; Thomsen,   Michael R.
Herbicide-resistant (HR) rice technology is a potential tool for control of red rice in commercial rice production.  Using an ex ante mathematical programming framework, this research presents an empirical analysis of HR rice technology adoption under uncertainty.  The analysis accounts for stochastic germination of red rice and sheath blight to model a profit maximization problem of crop rotation among HR rice, regular rice, and soybeans.  The results demonstrate that risk attitudes and technology efficiency determine adoption rates and optimal rotation patterns.
Tipo: Journal Article
Palavras-chave: Biotechnology; Herbicide resistance; Mathematical programming; Profit maximization; Rice; Risk; Rotation; Technology; Adoption; Crop Production/Industries; Production Economics; Research and Development/Tech Change/Emerging Technologies; Q16; Q18; O33; C61.
Ano: 2005
URL: http://purl.umn.edu/43724

Social Costs of Herbicide Resistance: The Case of Resistance to Glyphosate
Provedor de dados: 31
Autores: Marsh,   Sally P.; Llewellyn,   Rick S.; Powles,   Stephen B.
Unlike in the pesticide and antibiotic resistance literature, potential social costs and externalities associated with herbicide resistance have not generally been considered by economists. The economics of managing herbicide resistance in weeds has focused on cost-effective responses by growers to the development of resistance at the individual farm and field level. Economic analyses of optimal herbicide use have focused on optimising farmer returns in the long run. Weeds have been considered less mobile, compared to insects and diseases, suggesting that externalities resulting from resistance spread will be minimal and any consequent social costs low. Glyphosate is the world's most widely used broad-spectrum non-selective herbicide. Declining glyphosate...
Tipo: Conference Paper or Presentation
Palavras-chave: Glyphosate resistance; Herbicide resistance; Social costs; Externalities; Resistance mobility; Crop Production/Industries.
Ano: 2006
URL: http://purl.umn.edu/25413

Optimal management of annual ryegrass ( Lolium rigidum Gaud.) in phase rotations in the Western Australian Wheatbelt
Provedor de dados: 31
Autores: Doole,   Graeme J.
Lucerne ( Medicago sativa L.) helps to prevent soil salinisation in the Western Australian Wheatbelt by reducing recharge to saline water tables. There is broad consensus, though, that it is not sufficiently profitable to motivate producers to plant it at the intensity at which considerable off-site benefits would be conferred. This paper employs a multiple-phase optimal control model to explore the value of this perennial pasture for the management of herbicide-resistant annual ryegrass ( Lolium rigidum Gaud.) in a crop–pasture rotation, given the difficulty of observing this value in practice. The availability of selective herbicides for efficient weed control is found to determine whether or not it is profitable to adopt lucerne pasture under optimal...
Tipo: Article
Palavras-chave: Annual ryegrass; Herbicide resistance; Multiple-phase optimal control; Crop Production/Industries.
Ano: 2008
URL: http://purl.umn.edu/118547

Economic impacts of high labour cost and herbicide resistance for the management of annual barnyardgrass (Echinochloa crus-galli) in rice production in the Philippines
Provedor de dados: 31
Autores: Beltran,   Jesusa C.; Pannell,   David J.; Doole,   Graeme J.
Implications of increasing labour cost and development of herbicide resistance for profitable weed management in Philippine rice farming systems are investigated. The study employs RIMPhil (Resistance and Integrated Management in the Philippines), a bioeconomic simulation model developed to provide a comprehensive assessment of integrated weed management programmes for the control of annual barnyardgrass (Echinochloa crus-galli) in rice crops. Results indicate that herbicide application will become increasingly economically attractive, relative to manual weeding, as labour cost increases. This is important since urban migration in the Philippines continues to increase the scarcity of rural labour. Results also show that the onset of herbicide resistance...
Tipo: Working or Discussion Paper
Palavras-chave: Barnyardgrass; Bioeconomic model; Herbicide resistance; Integrated weed management; Rice production; Crop Production/Industries; Farm Management; Research and Development/Tech Change/Emerging Technologies.
Ano: 2011
URL: http://purl.umn.edu/108770

Factors influencing adoption of conservation tillage in Australian cropping regions
Provedor de dados: 31
Autores: D'Emden,   Francis H.; Llewellyn,   Rick S.; Burton,   Michael P.
The purpose of this research is to improve understanding of conservation tillage adoption decisions by identifying key biophysical and socio-economic factors influencing no-till adoption by grain growers across four Australian cropping regions. The study is based on interviews with 384 grain growers using a questionnaire aimed at eliciting perceptions relating to a range of possible long- and short-term agronomic interactions associated with the relative economic advantage of shifting to a no-tillage cropping system. Together with other farm and farmer-specific variables, a dichotomous logistic regression analysis was used to identify opportunities for research and extension to facilitate more rapid adoption decisions. The broader systems approach to...
Tipo: Article
Palavras-chave: Adoption; Conservation tillage; Herbicide resistance; No-till; Perceptions; Weed management; Farm Management.
Ano: 2008
URL: http://purl.umn.edu/118537

Competition effects with mixed stands of wheat and kochia (Kochia scoparia) biotypes resistant and susceptible to acetolactase synthase inhibitor herbicides
Provedor de dados: 63
Autores: Christoffoleti,P.J.; Westra,P.
Greenhouse experiments were conducted to compare the competitive ability of sulfonylurea resistant and susceptible kochia (Kochia scoparia L. Schard) compared to wheat. The results of several replacement series experiments indicate that wheat was the dominant competitor, and an average of one wheat plant reduced resistant kochia yield per plant equal to the effect of 4.8 resistant kochia or 5.4 susceptible kochia plants. Intraspeciflc competition was more important than interspecific competition for wheat, whereas the reverse was true for the resistant and susceptible kochia. The results of the niche differentiation index (NDI) indicate that wheat and either resistant or susceptible kochia are only partly limited by the same resources. The resistant and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weed; Herbicide resistance; Sulfonylurea; Kochia scoparia; Weed-crop competition.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200008

ACCase-inhibiting herbicides: mechanism of action, resistance evolution and stewardship
Provedor de dados: 63
Autores: Takano,Hudson Kagueyama; Ovejero,Ramiro Fernando Lopez; Belchior,Gustavo Gross; Maymone,Gizella Potrich Leal; Dayan,Franck E.
ABSTRACT Herbicides play an important role in preventing crop yield losses due to both their weed interference ability and their capacity for increasing soil conservation in no-till systems. Group A herbicides or acetyl-CoA carboxylase (ACCase) are essential tools the selective management of glyphosate resistance in grass weed species. In this review, we describe important aspects of ACCase biology and herbicides targeting this enzyme, along with a discussion on stewardship programs to delay the evolution of herbicide resistance which can evolve either through target site and/or non-target site mechanisms. Sixteen-point mutations have been reported to confer resistance to ACCase inhibitors. Each mutation confers cross resistance to a different group of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide resistance; Integrated weed management; Aryloxyphenoxypropionates; Cyclohexanediones; Phenylpyrazoline.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101301

Oxidative stress and differential antioxidant enzyme activity in glyphosate-resistant and -sensitive hairy fleabane in response to glyphosate treatment
Provedor de dados: 53
Autores: Piasecki,Cristiano; Carvalho,Ivan Ricardo; Cechin,Joanei; Goulart,Francisco A. P; Maia,Luciano Carlos da; Agostinetto,Dirceu; Caverzan,Andréia; Stewart Jr.,C. Neal; Vargas,Leandro.
ABSTRACT Biochemical assays in a time-course were employed to evaluate stresses induced by glyphosate treatment in resistant and sensitive biotypes of Conyza bonariensis. Two experiments were conducted assessing glyphosate doses and time-course after treatment. The doses of glyphosate ranged from 0 to 11840 g ae·ha–1 and assessments performed until 552 h after glyphosate treatment (HAT). The objectives of this study were to evaluate the oxidative stress and differential antioxidant enzyme activity in glyphosate-resistant and -sensitive biotypes of hairy fleabane after glyphosate treatment. After treatment, both studied biotypes accumulated similar levels of shikimic-acid until 96 h. The sensitive biotype died at192 HAT. Shikimic-acid and hydrogen peroxide...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conyza bonariensis; Lipid peroxidation; Shikimic-acid; Herbicide resistance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300379

Evidence of accelerated and altered pollen development after Imazapyr treatment in resistant sunflower
Provedor de dados: 53
Autores: Ochogavía,Ana Claudia; Bianchi,Marta Beatríz; Picardi,Liliana; Nestares,Graciela María.
ABSTRACT Imazapyr (IM) treatment applied at early reproductive developmental stages have been associated with induced male sterility in sunflower (Helianthus annuus L.). The aim of this work was to determine the effects induced by two different doses of IM-treatment (1X and 2X; 80 and 160 g a.i.·ha-1) on pollen grain yield, pollen viability and on the exine surface, in an intermediate resistant (I) and a completely resistant (R) genotype. An anatomical analysis of some stages during the microsporogenesis and microgametogenesis was also achieved by confocal microscopy. Plants of both genotypes survived the herbicide treatments and showed no external injury symptoms. Differential response to different doses of IM was obtained in R and I genotypes. The pollen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Induced male-sterility; Confocal microscopy; Herbicide resistance; Helianthus annuus L.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052020000100094

Contribution of non-target-site resistance in imidazolinone-resistant Imisun sunflower
Provedor de dados: 53
Autores: Breccia,Gabriela; Gil,Mercedes; Vega,Tatiana; Altieri,Emiliano; Bulos,Mariano; Picardi,Liliana; Nestares,Graciela.
ABSTRACT The first commercial herbicide-resistant trait in sunflower (Helianthus annuus L.) is known as ‘Imisun’. Imidazolinone resistance in Imisun cultivars has been reported to be genetically controlled by a major gene (known as Imr1 or Ahasl1-1) and modifier genes. Imr1 is an allelic variant of the Ahasl1 locus that codes for the acetohydroxyacid synthase, which is the target site of these herbicides. The mechanism of resistance endowed by modifier genes has not been characterized and it could be related to non-target-site resistance. The objective of this study was to evaluate the role of cytochrome P450 monooxygenases (P450s) in Imisun resistance. The response to imazapyr herbicide in combination with P450s inhibitor malathion was evaluated in 2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus L.; Cytochrome P450 monooxygenases; Imazapyr; Herbicide resistance.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400536

Germination test as a fast method to detect glyphosate-resistant sourgrass
Provedor de dados: 53
Autores: Dias,Marcos Altomani Neves; Obara,Flavio Eduardo Botelhos; Arruda,Natalia; Cursi,Patricia Ribeiro; Gonçalves,Navara Roberto; Christoffoleti,Pedro Jacob.
The occurrence of weed species with different levels of resistance to glyphosate has increasingly spread in agricultural areas. In Brazil, sourgrass is among the main species presenting issues in this regard. Thus, fast and reliable methods to detect glyphosate resistance are of special interest for this specie, either for research or rational management purposes. This study was carried out to verify the feasibility of using the germination test to detect glyphosate resistance in sourgrass. The experiment was conducted with two sourgrass biotypes, with different levels of susceptibility to glyphosate. The seeds were previously imbibed in solutions composed of 0, 0.1875%, 0.25%, 0.75%, 1.5%, 3% and 6% of glyphosate during two periods, five and ten minutes,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digitaria insularis (L.); Herbicide resistance; Weed management; Seed analysis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000300307

Positive, negative and marker-free strategies for transgenic plant selection
Provedor de dados: 61
Autores: Aragão,Francisco José Lima; Brasileiro,Ana Cristina Miranda.
In this review, the use of the most common selection marker genes on plant transformation and the effects of their respective selective agents are discussed. These genes could be divided in two categories according their mode of action: genes for positive and negative selection. The retention of the marker gene flow through chloroplast transformation is also discussed. Further, strategies to recover marker-free transgenic plants, involving multi-auto-transformation (MAT), co-transformation, site-specific recombination and intragenomic relocation of transgenes through transposable elements are reviewed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antibiotic resistance; Herbicide resistance; Marker genes; Plant transformation; Selection; Transgenic plant.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000100001

Multiple resistance to atrazine and imazethapyr in hairy beggarticks (Bidens pilosa )
Provedor de dados: 64
Autores: Takano,Hudson Kagueyama; Oliveira Junior,Rubem Silvério de; Constantin,Jamil; Braz,Guilherme Braga Pereira; Franchini,Luiz Henrique Morais; Burgos,Nilda Roma.
ABSTRACT Resistance to herbicides is a serious threat to crop production worldwide, especially in agronomic crops and cereals. This research evaluated the possible occurrence of Bidens pilosa resistant to imazethapyr and atrazine in Brazil. The resistant biotype was collected from an area with a history of repeated application of photosystem II (PSII) and ALS inhibitor herbicides. The susceptible biotype was collected from an area with no history of herbicide application. Resistance verification experiments were carried out in the greenhouse. The treatments were arranged in a 3 x 8 factorial scheme, where the first factor was populations [susceptible (S), parent resistant (PR), and resistant F1 (RF1)]; and the second factor was herbicide dose (0, 375, 750,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photosystem II; Resistance level; Herbicide resistance.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000500547