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Evaluation of the Mechanism Responsible for the Low-Level Resistance to Glyphosate in Goosegrass Planta Daninha
ULGUIM,A.R.; FRANCO,J.J.; SILVA,J.D.G.; AGOSTINETTO,D.; VARGAS,L..
ABSTRACT Goosegrass (Eleusine indica) infests various crops, being reported as low-level resistant (LLR) to glyphosate. The objectives of this study were to evaluate the mechanisms of resistance to glyphosate in goosegrass by the cyt-P450 complex to identify changes in leaf anatomy of these plants and quantify the accumulation of shikimate in biotypes susceptible and with LLR. The metabolic rate was assessed by applying the cyt-P450 malathion inhibitor 30 minutes before the herbicide application. The analysis of the leaf anatomy consisted of a characterization of anatomic cross-sections and evaluation of the effect of glyphosate on the leaf epidermis and the conducting vessels. Plant tissue was collected 24 hours after treatment (HAT) of the dose-response...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cyt-P450 monooxygenase; Shikimate; Absorption and translocation; EPSPs; Eleusine indica.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100206
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Is Increasing Doses of Imazapyr + Imazapic Detrimental to the Main Crop Rotation Alternatives to Flooded Rice? Planta Daninha
ULGUIM,A.R.; CARLOS,F.S.; ZANON,A.J.; OGOSHI,C.; BEXAIRA,K.P.; SILVA,P.R.F..
ABSTRACT: Imazapyr+imazapic ready mix is the main herbicide used to weed control in Clearfield® Rice System. The continuous use of high doses may increase their residual activity in the soil. The aim of this research was determine the sensitivity of cover crops and soybean in rotation with flooded rice to different levels of imazapyr+imazapic residues in the soil and its effect on soil microbiology. A field experiment was performed during the 2014/15 and 2015/16 seasons. In the first crop season, flooded rice was cultivated using herbicide rates in order to have levels of residue in the soil: 0, 140 (label dosage, equivalent to 73.5+24.5 g a.i. ha-1), 280, 560, 840 and 1,120 g ha-1. After crop harvest, during fall-winter, it was sown ryegrass, white clover...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil residue; Ryegrass; White clover; Soybean.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100152
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Morphological and Metabolic Changes in Soybean Plants Cultivated in Irrigated Rice Rotation and as Affected by Imazapyr and Imazapic Herbicides Carryover Planta Daninha
FRAGA,D.S.; AGOSTINETTO,D.; LANGARO,A.C.; OLIVEIRA,C.; ULGUIM,A.R.; SILVA,J.D.G..
ABSTRACT: The appearance of soybean cultivars that are tolerant to herbicides from the imidazolinone group enables irrigated rice rotation conducted on Clearfield® system. The objective of this work was to evaluate the morphological and metabolic changes of soybean cultivars containing Cultivance® (CV), which is tolerant to imidazolinone, sulphonylurea toletant (STS) and Roundup Ready® (RR), which is tolerant to glyphosate as affected by carryover of increasing doses of imazapyr and imazapic herbicides mixture, applied in the management of irrigated rice crop. Thus, experiments were conducted on the field and in greenhouse, evaluating phytotoxicity, height, leaf area, shoot dry matter, as well as variables related to the secondary metabolism of plants like...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Imidazolinones; Glicine max; Reactive oxygen species.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100211
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Resistance Mapping of the Genus Cyperus in Rio Grande do Sul and Selection Pressure Analysis Planta Daninha
ULGUIM,A.R.; SILVA,B.M.; AGOSTINETTO,D.; AVILA NETO,R.C.; ZANDONÁ,R.R..
ABSTRACT: Among the species of the genus Cyperus occurring in paddy rice, C. esculentus, C. difformis and C. iria are the most important, and the latter two are reported as resistant to herbicides in Rio Grande do Sul (RS). The aim of this work was to characterize and mapping the occurrence of resistant plants of the genus Cyperus in areas of paddy rice in RS State, and to analyze the agronomic factors that interfere in the resistance selection. Seeds from individual plants were harvested in the 2014/15 crop, characterized as control failures by the application of acetolactate synthase inhibitors (ALS), totaling 43 samples. At the time of collection, the grower was inquired on aspects related to the management of weeds in the crop. Seeds were germinated in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Acetolactate synthase; Cyperus esculentus; C. iria; C. difformis; Irrigated rice.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100254
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