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Biochemical and Physiological Changes in Rice Plants Due to the Application of Herbicides1 Planta Daninha
LANGARO,A.C.; AGOSTINETTO,D.; OLIVEIRA,C.; SILVA,J.D.G.; BRUNO,M.S..
ABSTRACT The application of herbicides, even if selective, can cause biochemical and physiological changes, resulting in oxidative stress. This stress comes from the accumulation of reactive oxygen species produced due to exposure to the herbicide. However, plants have developed defense strategies, which can be enzymatic or non-enzymatic. The objective of this study was to evaluate the morphological and metabolic changes such as photosynthetic parameters, oxidative damage and antioxidant enzyme activity of rice plants after applying herbicides. For this, a study was conducted in a greenhouse and laboratory and the treatments consisted of application of imazapic + imazapyr, quinclorac, bentazon, cyhalofop-butyl, penoxsulan, bispyribac-sodium and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Oxidative stress; Lipid peroxidation; Selectivity.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000200277
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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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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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Partitioning of Competition for Resources Between Soybean and Corn as Competitor Plant Planta Daninha
CARATTI,F.C.; LAMEGO,F.P.; SILVA,J.D.G.; GARCIA,J.R.; AGOSTINETTO,D..
ABSTRACT Plants compete for resources present below and above the soil surface. The objective of this work was to separate the individual effects of the competition for resources between soybean and corn as competitor plants. The experiment was conducted in a greenhouse, in 2014/2015. The treatments consisted of soybean cultivars (TEC 5718 and TEC 6029) in competition conditions with corn (no competition, competition for soil resources, competition for solar radiation and total competition). The variables evaluated were plant height at 7, 14, 21, 28, 35 and 42 days after emergence (DAE), stem/culm diameter, leaf area, shoot dry mass, root dry mass and the chlorophyll index, at 42 (DAE). The competition for soil resources between soybean and corn is...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Zea mays; Water; Competitiveness; Solar radiation; Competitor plant.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000400657
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