Molecular characterization of accessions of crabgrass (Digitaria nuda) and response to ametryn

Vieira, Valter Afonso; Alves, Pedro Luís da Costa Aguiar; Picchi, Simone Cristina; Lemos, Manoel Victor Franco; Sena, Janete Apparecida Desidério

doi:10.4025/actasciagron.v32i2.3841

Cited by 5 publications

(7 citation statements)

References 29 publications

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“…Similar results were found by Vieira et al (2010) with ametrine herbicide application at a dose of 2400 g a.i. ha -1 , which provided an efficient control of the access of D. nuda, averaged at 90% after 7 DAA and 100% after 14 DAA.…”

Section: Resultssupporting

confidence: 76%

“…Currently, the use of herbicides is an essential and common practice in agricultural areas because of the extensive farming and the high cost of labor (Vieira, 2010). The effectiveness of a herbicide depends on several factors, such as physical and chemical characteristics and the applied dose, the species to be controlled (own structural characteristics), the development stage and the biology features of the weed, application techniques, the soil moisture, and environmental factors at the time of herbicide application -i.e.…”

Section: Introductionmentioning

confidence: 99%

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Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

et al. 2012

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This project aimed to relate the control efficiency of ACCase inhibiting herbicides applied post-emergence to Digitaria horizontalis plants under different soil water contents. The experiments were conducted in a greenhouse, with the application of three different herbicides (fluazifop-p-butyl, haloxyfop-methyl, and sethoxydim + mineral oil Assist). The experimental design used for each herbicide was completely randomized, with four replications, consisting of a 3 x 4 factorial, with the combination of water management strategies (-0.03, -0.07 and -1.5 MPa) and four doses of these products (100%, 50%, 25%, and 0% of the recommended dose). Herbicide application was made at two vegetative stages, 4-6 leaves and 2-3 tillers. The visual phytotoxicity evaluations were performed at 14 days after application and the plant dry weight at the end of the study was evaluated. The control efficiency was not affected by water management strategies when applied to the recommended dose of the herbicides in early stages of plant development (4-6 leaf stage). In late applications (2-3 tiller stage) the plants held under drought stress showed less phytotoxicity.

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Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

et al. 2012

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“…These are highly invasive plants, classified as problem weeds in 60 countries, which infest more than 30 crops of economic importance. In Brazil, they constitute a serious problem for many spring and summer crops, such as maize (VIEIRA et al, 2010;KISSMANN, 1997).…”

Section: Introductionmentioning

confidence: 99%

Periods of weed interference in maize crops cultivated in the first and second cycles

Campos

Barroso

Silva

et al. 2016

SCA

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The interference of weeds in maize production may be reflected in grain yield losses that vary as a function of the density, stage and degree of aggressiveness of the species present. In the agricultural ecosystem, crops and weeds demand light, water, nutrients and space, which are frequently not available in sufficient quantities, leading to competition. The aim of this work was to determine the period of interference of weed plants, in particular of naked crabgrass (Digitaria nuda) on maize crop in the first and second harvest. The treatments were defined as increasing periods of coexistence and increasing control of weed community (7, 14, 21, 28, 35, 42, 49, and 56 days), two more controls, a control including one with weed control until the end of the culture cycle and another with coexistence until the harvest. For each period, were evaluated the stand of maize plants, length of ear, number of grains per row, number of rows per ear, cob, 100-grain weight, and grain productivity. The data obtained were subjected to analysis of variance using the F test, with average treatments compared using Tukey's test at 5% probability. Crop productivity was evaluated by means of regressions, the critical periods of interference were estimated. The critical timing of weed removal was 25 days for both harvests. The critical weed free period was 54 and 27 days for the first and second harvest respectively. For the conditions of the first and second harvest, the critical period of weed control was of 29 and 2 days respectively. Key words: Digitaria nuda. Naked crabgrass. Competition. Phytosociology. Weed interference. Zea mays. ResumoA interferência de plantas daninhas no milho pode refletir em perdas na produtividade de grãos que variam em função da densidade, estágio e grau de agressividade das espécies presentes. No ecossistema agrícola, a cultura e planta daninha possuem demandas por luz, água, nutrientes e espaço, que na maioria das vezes, não estão disponíveis em quantidades suficientes, estabelecendo-se a competição. O objetivo desse trabalho foi determinar o período de interferência de plantas de plantas daninhas em especial do capim-colchão (Digitaria nuda) na cultura do milho na primeira e segunda safra. Os tratamentos foram divididos em períodos crescentes de convivência e de controle da comunidade infestante (7; 14; 21; 28; 35; 42; 49 e 56 dias), mais duas testemunhas, uma com controle até o fim do ciclo da cultura e outra com convivência até a colheita. Para cada período foram avaliadas o estande de plantas de milho, comprimento das espigas, número de grãos por fileiras, número de fileiras por espiga, massa de 100 grãos e produtividade de grãos. Os dados obtidos foram submetidos à análise de variância

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“…In plants, ametryn toxicity is related to the blockage of the electron transport chain binding specifically to D1 proteins of photosystem II, thereby preventing photosynthesis [12]. In contrast, the mode of action of clomazone consists of inducing lipid peroxidation in cells by blocking carotenoid synthesis [13], [14].…”

Section: Introductionmentioning

confidence: 99%

Differential Responses of the Antioxidant System of Ametryn and Clomazone Tolerant Bacteria

et al. 2014

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The herbicides ametryn and clomazone are widely used in sugarcane cultivation, and following microbial degradation are considered as soil and water contaminants. The exposure of microorganisms to pesticides can result in oxidative damage due to an increase in the production of reactive oxygen species (ROS). This study investigated the response of the antioxidant systems of two bacterial strains tolerant to the herbicides ametryn and clomazone. Bacteria were isolated from soil with a long history of ametryn and clomazone application. Comparative analyses based on 16S rRNA gene sequences revealed that strain CC07 is phylogenetically related to Pseudomonas aeruginosa and strain 4C07 to P. fulva. The two bacterial strains were grown for 14 h in the presence of separate and combined herbicides. Lipid peroxidation, reduced glutathione content (GSH) and antioxidant enzymes activities were evaluated. The overall results indicated that strain 4C07 formed an efficient mechanism to maintain the cellular redox balance by producing reactive oxygen species (ROS) and subsequently scavenging ROS in the presence of the herbicides. The growth of bacterium strain 4C07 was inhibited in the presence of clomazone alone, or in combination with ametryn, but increased glutathione reductase (GR) and glutathione S-transferase (GST) activities, and a higher GSH concentration were detected. Meanwhile, reduced superoxide dismutase (SOD), catalase (CAT) and GST activities and a lower concentration of GSH were detected in the bacterium strain CC07, which was able to achieve better growth in the presence of the herbicides. The results suggest that the two bacterial strains tolerate the ametryn and clomazone herbicides with distinctly different responses of the antioxidant systems.

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Molecular characterization of accessions of crabgrass (Digitaria nuda) and response to ametryn

Cited by 5 publications

References 29 publications

Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

Periods of weed interference in maize crops cultivated in the first and second cycles

Differential Responses of the Antioxidant System of Ametryn and Clomazone Tolerant Bacteria

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