Bioensaios para diagnóstico da resistência aos herbicidas imidazolinonas em arroz

Roso, A.C.; Merotto, Aldo; Delatorre, Carla Andréa

doi:10.1590/s0100-83582010000200021

Cited by 18 publications

(22 citation statements)

References 20 publications

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“…Studies with rice plants of the cv. Puitá Inta CL demonstrate high tolerance to the herbicides of the group of the imidazolinonas, when compared to the ones from other cultivars CL (Roso, 2010).…”

Section: Resultsmentioning

confidence: 84%

Chlorophyll a fluorescence in rice plants exposed of herbicides of group imidazolinone

et al. 2014

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-The objective of this work was to investigate the injuries caused to the photosynthetic apparatus of three types of rice exposed to application of imidazolinone group herbicides. Two experiments were conducted using herbicides Imazethapyr+imazapic and Imazapyr+imazapic, in a split-plot experimental design, and a 3 x 3 factorial, with six replications. The first factor (A) consisted of the herbicide rates 0, 100 e 200 g ha -1 of Imazethapyr+imazapic and 0, 140 e 280 g ha -1 of Imazapyr+imazapic; factor B consisted of type of rice (cv. Puitá Inta CL, sensitive red rice ecotype and red rice ecotype with suspected herbicide tolerance to Imidazolinone). Chlorophyll a fluorescence parameters were evaluated in plants at 30 days after herbicide application, using a portable fluorometer (HandyPEA, Hanstech). The photosynthetic metabolism of cv. Puitá Inta CL was found to tolerate commercial dosages of both herbicides. High sensitivity to the herbicides was observed for the sensitive red rice ecotype, while the photosynthetic apparatus of red rice ecotype with suspected herbicide tolerance showed high tolerance to both herbicides applied at rates higher than the commercial rate. The application of chemical herbicides of the imidazolinone group on rice plants causes changes in the photosynthetic metabolism of plants, detected by evaluating the emission of transient chlorophyll a fluorescence. This method can be useful in helping detect resistance and/or tolerance of red rice plants to herbicides of the imidazolinone group.Keywords: ALS-inhibitors, Oryza sativa, photosystems, JIP-test. SOUSA, C.P. et al. RESUMO -Este estudo objetivou avaliar as injúrias causadas ao aparelho fotossintético de três tipos de arroz, expostos a herbicidas do grupo das imidazolinonas. Foram conduzidos dois experimentos utilizando os herbicidas imazethapyr+imazapic e imazapyr+imazapic, ambos em delineamento experimental de parcelas subdivididas, em fatorial 3 x 3, com seis repetições. O fator A consistiu de doses dos herbicidas correspondentes a 0, 100 e 200 g ha -1 de imazethapyr+imazapic e a 0, 140 e 280 g ha -1 de imazapyr+imazapic, e o fator B, do tipo de arroz (cv. Puitá Inta CL, ecótipo de arroz-vermelho sensível e ecótipo de arroz-vermelho com suspeita de tolerância aos herbicidas imidazolinonas). Foram avaliados os parâmetros da fluorescência da clorofila a nas plantas aos 15 e 30 dias após a aplicação dos herbicidas, utilizando-se um fluorômetro portátil (HandyPEA

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Section: Resultsmentioning

confidence: 84%

Chlorophyll a fluorescence in rice plants exposed of herbicides of group imidazolinone

et al. 2014

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“…and sedges (Cyperus spp.) (Galon et al, 2008;Roso et al, 2010;Matzenbacher et al, 2013;Schaedler et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Physical Properties and Crop Management for Corn in an Albaqualf

Giacomeli

Marchesan

Oliveira

et al. 2017

Rev. Bras. Ciênc. Solo

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Rice monoculture in lowlands can cause problems for management practices in crop fields, for example, in weed control. For this reason, corn in rotation with irrigated rice in lowlands may be advantageous, despite problems with soil compaction and water excess. The objective of this study was to evaluate soil physical properties and corn performance in soil management systems in an Albaqualf soil (lowlands). Two experiments were conducted in the field, in the 2013/14 and 2014/15 crop seasons. The experimental design was randomized blocks with two factors. There were three levels for the first factor, consisting of soil management practices: soil chiseling 45 days before sowing to a depth of 0.3 m; conventional tillage with two diskings to a depth of 0.1 m and subsequent leveling of the soil; and no-till. The second factor was composed of two levels: sowing on raised seedbeds, and without raised seedbeds. The soil parameters of bulk density, total porosity, macroporosity, microporosity, volumetric moisture, and soil resistance to mechanical penetration (RP) were evaluated. The corn parameters were plant height, shoot dry matter, leaf area, height of the first ear of corn, grains per ear, and grain yield. Soil chiseling resulted in lower RP and higher macroporosity in the 0.1-0.2 and 0.2-0.3 m layers. In raised seedbeds, the 0.00-0.05, 0.05-0.10, and 0.10-0.20 m layers were lower in RP and bulk density. Moreover, higher soil macroporosity was observed in relation to the treatment without raised seedbeds. In general, the highest grain yields were found in the treatments with lower RP and higher macroporosity in the root system region. Increased porosity accelerated water drainage in the soil, reducing the time that soil airspace was filled with water, which is a limiting factor for root development. In Albaqualf soils, planting corn in chiseled soil provides higher corn yields compared to conventional tillage, and planting corn on raised seedbeds provides higher corn yields compared to the lack of raised seedbeds.

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“…However, resistance can also be identified by enzyme activity through molecular markers (Merotto Jr. et al, 2009a;Roso et al, 2010). The comparison of biotypes with suspected resistance and susceptible biotypes by the conventional, molecular or biochemical methods is usually time and labor consuming as well as expensive.…”

Section: Introductionmentioning

confidence: 99%

“…to acetyl CoA carboxylase (ACCase)-inhibiting herbicides was evaluated in an agar bioassay for seedling growth and identified in 10 days after herbicide treatment (Kaundun et al, 2011). In another study, the resistance of red rice to imidazolinone herbicides could be Rapid diagnosis of resistance to imidazolinone herbicides in ... identified in seven days after incubation in seedling and tiller bioassays, and this allowed the rapid identification of resistance and proved useful for decision-making in crop management (Roso et al, 2010). Several other studies were conducted in the last decade regarding the confirmation of herbicide resistance in weeds, including Echinochloa spp.…”

Section: Introductionmentioning

confidence: 99%

Rapid diagnosis of resistance to imidazolinone herbicides in barnyardgrass (Echinochloa crus-galli) and control of resistant biotypes with alternative herbicides

Matzenbacher

Kalsing²,

Menezes³

et al. 2013

Planta daninha

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-The resistance of barnyardgrass (Echinochloa crus-galli) to imidazolinone herbicides is a worldwide problem in paddy fields. A rapid diagnosis is required for the selection of adequate prevention and control practices. The objectives of this study were to develop expedite bioassays to identify the resistance to imidazolinone herbicides in barnyardgrass and to evaluate the efficacy of alternative herbicides for the post-emergence control of resistant biotypes. Three experiments were conducted to develop methods for diagnosis of resistance to imazethapyr and imazapyr + imazapic in barnyardgrass at the seed, seedling and tiller stages, and to carry out a pot experiment to determine the efficacy of six herbicides applied at post-emergence in 13 biotypes of barnyardgrass resistant to imidazolinones. The seed soaking bioassay was not able to differentiate the resistant and susceptible biotypes. The resistance of barnyardgrass to imidazolinones was effectively discriminated in the seedlings and tiller bioassays seven days after incubation at the concentrations of 0.001 and 0.0001 mM, respectively, for both imazethapyr and imazapyr + imazapic. The biotypes identified as resistant to imidazolinones showed different patterns of susceptibility to penoxsulam, bispyribac-sodium and pyrazosulfuron-ethyl, and were all controlled with profoxydim and cyhalofop-butyl. The seedling and tiller bioassays are effective in the diagnosis of barnyardgrass resistance to imidazolinone herbicides, providing an on-season opportunity to identify the need to use alternative herbicides to be applied at post-emergence for the control of the resistant biotypes.Keywords: bioassays, imazethapyr, imazapyr, imazapic, rice.RESUMO -A resistência de capim-arroz (Echinochloa crus-galli) aos herbicidas imidazolinonas é um problema crescente na cultura do arroz em diversas regiões do mundo, sendo necessário o seu diagnóstico rápido para a determinação de práticas de prevenção e controle. Os objetivos deste trabalho foram desenvolver métodos de identificação expedita da resistência de biótipos de capimarroz aos herbicidas imidazolinonas e avaliar a eficácia de herbicidas alternativos para o seu controle em pós-emergência. Para isso, foram conduzidos três experimentos visando o desenvolvimento de métodos de diagnóstico da resistência aos herbicidas imazethapyr e imazapyr + imazapic em plantas de capim-arroz nos estádios de semente, plântula e perfilhos, bem como um experimento para determinar a eficácia de seis herbicidas em pós-emergência no controle de 13 biótipos de capim-arroz resistentes às imidazolinonas. A resistência de capim-arroz a imidazolinonas foi discriminada de forma eficiente MATZENBACHER, F.O. et al.Planta Daninha, Viçosa-MG, v. 31, n. 3, p. [645][646][647][648][649][650][651][652][653][654][655][656] 2013 646 nos experimentos com plântulas e perfilhos aos sete dias após a incubação nas concentrações de 0,001 e 0,0001 mM, respectivamente, para os herbicidas imazethapyr e imazapyr + imazapic. Os biótipos identificados como resis...

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Bioensaios para diagnóstico da resistência aos herbicidas imidazolinonas em arroz

Cited by 18 publications

References 20 publications

Chlorophyll a fluorescence in rice plants exposed of herbicides of group imidazolinone

Chlorophyll a fluorescence in rice plants exposed of herbicides of group imidazolinone

Physical Properties and Crop Management for Corn in an Albaqualf

Rapid diagnosis of resistance to imidazolinone herbicides in barnyardgrass (Echinochloa crus-galli) and control of resistant biotypes with alternative herbicides

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