Distribuição de glyphosate e acúmulo de nutrientes em biótipos de azevém

Ferreira, E.A.; Silva, Antônio Alberto da; Reis, Marcelo Rodrigues dos; Santos, J.B.; Oliveira, Juraci Alves de; Várgas, Leandro; Khouri, K.R.; Guimarães, Amanda Azarias

doi:10.1590/s0100-83582008000100017

Cited by 7 publications

(6 citation statements)

References 10 publications

(5 reference statements)

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“…The ryegrass shoot dry matter caused reductions in wheat grain yield cultivars in ascending order, TBIO Alvorada, BRS 327, BRS 328, BRS Marcante and TBIO Pioneiro (Table 1). When in association with ryegrass biotypes resistant and susceptible to glyphosate, wheat showed losses in leaf area and shoot dry matter (Ferreira et al 2008), similar to that observed in the present study.…”

Section: Competitiveness and Economic Threshold Level (Etl) Between Wsupporting

confidence: 89%

Weed interference period and economic threshold level of ryegrass in wheat

et al. 2019

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The results allowed concluding that the management methods of weed ryegrass must be adopted in the period between 11 and 21 days after crop emergence, which is described as a critical period of control of this weed. The wheat grain yield loss competing with ryegrass reached 59% when grown with ryegrass. For ETL, the linear regression model of the rectangular hyperbola adequately estimates grain yield losses in the presence of ryegrass. The cultivar presenting the lowest values of ETL, that is, less capacity to live with the weed, was TBIO Alvorada. The other cultivars presented similar ETL values.

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Section: Competitiveness and Economic Threshold Level (Etl) Between Wsupporting

confidence: 89%

Weed interference period and economic threshold level of ryegrass in wheat

et al. 2019

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“…A competição afeta quantitativa e qualitativamente a produção, pois modifica a eficiência de aproveitamento dos recursos do ambiente, como água, luz, CO 2 e nutrientes (Bianchi et al, 2006), estabelecendo-se entre a cultura e as plantas de outras espécies existentes no local. Essa competição ocorre também entre indivíduos de uma mesma espécie ou entre biótipos predominantes na área, conforme constatado por Ferreira et al (2008), os quais verificaram que biótipos de azevém resistentes ao glyphosate possuem menor capacidade competitiva do que os suscetíveis.…”

Section: Resultsunclassified

Habilidade competitiva de cultivares de cevada convivendo com azevém

et al. 2011

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RESUMO -A determinação da habilidade competitiva de cultivares de cevada com plantas daninhas torna-se relevante para a adoção do método de manejo cultural; desse modo, podemse diminuir os custos de produção, bem como os impactos ambientais causados por outros métodos de manejo, como o químico. Este trabalho comparou as habilidades competitivas relativas de três cultivares de cevada e um biótipo de azevém. Foram realizados experimentos em casa de vegetação na estação de crescimento 2008/09, utilizando-se delineamento experimental de blocos casualizados, com quatro repetições. Os tratamentos foram arranjados em série de substituição e constituíram-se de cinco proporções de plantas de cevada e do azevém competidor com a cultura: 100:0, 75:25, 50:50, 25:75 e 0:100. A cevada foi representada pelos cultivares BRS Greta, BRS Elis e BRS 225, e o competidor, pelo azevém. A análise da competitividade foi efetuada por meio de diagramas aplicados a experimentos substitutivos, mais uso de índices de competitividade relativa. As variáveis estudadas foram: afilhamento, estatura, área foliar e massa da matéria seca da parte aérea das plantas. O azevém afetou o afilhamento, a área foliar e a massa da matéria seca da parte aérea de plantas dos cultivares de cevada BRS Greta, BRS Elis e BRS 225, demonstrando grande habilidade competitiva com a cultura pelos recursos disponíveis no meio. Entre os cultivares de cevada avaliados, BRS Elis foi o mais competitivo na presença do azevém, que é uma das espécies daninhas que necessitam de controle mesmo quando presente em baixas proporções na cultura da cevada.Palavras-chave: cereais de inverno, Hordeum vulgare, Lolium multiflorum, características morfofisiológicas.ABSTRACT -Characterization of the competitive ability of barley varieties against weed species is relevant for the adoption of the cultural method of weed control; thus, it is possible to reduce both the production costs and environmental impacts caused by other management methods, including the use of chemicals. This work assessed the competitive ability of barley varieties against ryegrass. Trials were installed under greenhouse conditions at the 2008/2009 cropping season, in a completely randomized block design, with four replications. Treatments were arranged in a substitution series design constituted by five proportions of plants of both species: 100:0; 75:25; 50:50; 25:75; and 0:100. Barley varieties BRS Greta, BRS Elis and BRS 225 were tested against ryegrass as the competitor. The competitive analysis was carried out through diagrams applied to the substitutive design, plus determination of relative competitiveness indexes. Plant height, tillering, leaf area and shoot dry mass were evaluated. The presence of ryegrass reduced tillering, leaf area and dry mass accumulation for all varieties of barley tested, showing to be an aggressive competitor. Among the barley varieties tested, BRS Elis showed the highest competitive ability against ryegrass. Ryegrass requires the adoption of control techniques even when present at l...

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“…Whereas glyphosate moves both through phloem as xylem (Peterson, 1989) and that xylem transport is approximately 20-50 times faster than in the phloem (Kleier & Hsu, 1996), it can be inferred that the molecule preferential transport would be toward the leaves (Dinelli et al, 2006). Ferreira et al (2008) studied the glyphosate' translocation of C. bonariensis resistant and susceptible biotypes and also noted that the herbicide translocation is much higher in the susceptible biotype, being the plant's root the organ with the highest glyphosate concentration. Around 20% of the 14 C -glyphosate applied was found in the susceptible plant's roots 72 hours after application, contrasting with the resistant plants, whose radioactivity was 5%.…”

Section: Experiments Ii: Glyphosate Herbicide Foliar Absorption and Trmentioning

confidence: 99%

Shikimate accumulation, glyphosate absorption and translocation in horseweed biotypes

et al. 2015

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-In Brazil, few research works on mechanisms of weed resistance to glyphosate have been conducted so far. Therefore, this research aimed to study analytical procedures determining the relation between the concentration of plant shikimate after glyphosate application and the plant resistance to this herbicide; and evaluate the glyphosate absorption and translocation into two resistant (R) and susceptible (S) horseweed biotypes to glyphosate. Horseweed plants with nine true leaves received glyphosate (720 g a.e. ha -1 ), and 2, 3, 4, 7 and 10 days after application (DAA) the concentration of shikimic acid was measured by HPLC. In another experiment, plants were treated with radiolabeled glyphosate ( 14 C) (1.456 MBq mmol -1 specific activity) and radioactivity was measured 4, 8, 24, 48 and 72 hours after treatment (HAT) by liquid scintillation spectrometry. The shikimate concentration in plants increased 16,351.14 and 7,892.25 mg kg -1 of dry weight, for R and S plants respectively, at seven DAA. Therefore, the procedure for quantification of shikimic acid was suitable for R and S plants differentiation to glyphosate, indicating that the R population is actually resistant to glyphosate. On average, 98% of glyphosate applied was absorbed by the studied biotypes, at 72 HAT. Around 68% of the absorbed radioactivity remained on the biotypes leaves treated, the S biotype showing the highest translocation. Therefore, the R biotype resistance mechanism studied is associated to the differential translocation.Keywords: Conyza bonariensis, High Performance Liquid Chromatography, EPSPS, selection, radioactivity. CARDINALI, V.C.B. et al. RESUMO -No

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Distribuição de glyphosate e acúmulo de nutrientes em biótipos de azevém

Cited by 7 publications

References 10 publications

Weed interference period and economic threshold level of ryegrass in wheat

Weed interference period and economic threshold level of ryegrass in wheat

Habilidade competitiva de cultivares de cevada convivendo com azevém

Shikimate accumulation, glyphosate absorption and translocation in horseweed biotypes

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