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https://www.readbyqxmd.com/read/28209433/surface-runoff-and-subsurface-tile-drain-losses-of-neonicotinoids-and-companion-herbicides-at-edge-of-field
#1
François Chrétien, Isabelle Giroux, Georges Thériault, Patrick Gagnon, Julie Corriveau
With their application as seed coatings, the use of neonicotinoid insecticides increased dramatically during the last decade. They are now frequently detected in aquatic ecosystems at concentrations susceptible to harm aquatic invertebrates at individual and population levels. This study intent was to document surface runoff and subsurface tile drain losses of two common neonicotinoids (thiamethoxam and clothianidin) compared to those of companion herbicides (atrazine, glyphosate, S-metolachlor and mesotrione) at the edge of a 22...
February 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28209406/endocrine-and-physiological-effects-of-linuron-and-s-metolachlor-in-zebrafish-developing-embryos
#2
C Quintaneiro, D Patrício, S C Novais, A M V M Soares, M S Monteiro
Evaluation of the effects of linuron and S-metolachlor on apical, biochemical and transcriptional endpoints in zebrafish (Danio rerio) early life stages was the main purpose of this work. Embryos were exposed for 96h to a range of concentrations of each herbicide to determine lethal and sub-lethal effects on apical (e.g. malformations, hatching) and biochemical parameters (cholinesterase, ChE; catalase, CAT; glutathione S-transferase, GST; lipid peroxidation, LPO and lactate dehydrogenase, LDH). To evaluate endocrine disruption effects, embryos were exposed during 96h to 0...
February 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28208114/efficient-degradation-of-chlorimuron-ethyl-by-a-bacterial-consortium-and-shifts-in-the-aboriginal-microorganism-community-during-the-bioremediation-of-contaminated-soil
#3
Chunyan Li, Tongyang Lv, Wanjun Liu, Hailian Zang, Yi Cheng, Dapeng Li
Excessive application of chlorimuron-ethyl has led to soil contamination and limited crop rotation; therefore, tactics to decrease and eliminate residual chlorimuron-ethyl in the environment have attracted increasing attention. In this study, two chlorimuron-ethyl-degrading bacterial strains (Rhodococcus sp. D310-1; Enterobacter sp. D310-5) were used to ferment and prepare a chlorimuron-ethyl-degrading bacterial consortium. To improve the degradation efficiency of the bacterial consortium, the cultivation conditions were optimized using response surface methodology (RSM)...
February 13, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28205155/endocrine-disruptors-and-obesity
#4
REVIEW
Philippa D Darbre
PURPOSE OF REVIEW: The purpose of this review was to summarise current evidence that some environmental chemicals may be able to interfere in the endocrine regulation of energy metabolism and adipose tissue structure. RECENT FINDINGS: Recent findings demonstrate that such endocrine-disrupting chemicals, termed "obesogens", can promote adipogenesis and cause weight gain. This includes compounds to which the human population is exposed in daily life through their use in pesticides/herbicides, industrial and household products, plastics, detergents, flame retardants and as ingredients in personal care products...
February 15, 2017: Current Obesity Reports
https://www.readbyqxmd.com/read/28202277/sub-lethal-effects-of-a-glyphosate-based-commercial-formulation-and-adjuvants-on-juvenile-oysters-crassostrea-gigas-exposed-for-35days
#5
Alexis Séguin, Antoine Mottier, Carole Perron, Jean Marc Lebel, Antoine Serpentini, Katherine Costil
Glyphosate-based herbicides include active matter and adjuvants (e.g. polyethoxylated tallow amines, POEAs). In addition to a previous investigation on the effect of glyphosate on oysters, the aim of the present study was to investigate the effects of sub-chronic exposures (35days) to three concentrations (0.1, 1 and 100μgL(-1)) of Roundup Express® (REX) and POEAs on oysters belonging to the same age group. Low mortality rates were calculated, and only few significant differences (i.e. shell length) between exposure conditions were observed at a given date...
February 12, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28202179/effects-of-melatonin-in-rats-in-the-initial-third-stage-of-pregnancy-exposed-to-sub-lethal-doses-of-herbicides
#6
Lécio Leone de Almeida, Álvaro Aguiar Coelho Teixeira, Anísio Francisco Soares, Franklin Magliano da Cunha, Valdemiro Amaro da Silva, Leucio Duarte Vieira Filho, Valéria Wanderley-Teixeira
: Exposure to the herbicides Paraquat (PQ) and Roundup(®) may cause cell lesions due to an increase in oxidative stress levels in different biological systems, even in the reproductive system. OBJECTIVE: Evaluate the possible changes in reproductive parameters and hepatic, as well as its prevention by simultaneous application of melatonin. METHODS: Thirty-five female rats at the age of 3 months were divided into seven groups: three groups exposed to sub-lethal doses of the herbicides PQ (50mg/kg) and Roundup(®) (500mg/kg) (n=5, G2, G3 and G4); three groups exposed to herbicides and simultaneous treatment with 10mg/kg of Melatonin (n=5, G5, G6 and G7) and control group (n=5, G1) from the first to the seventh day of pregnancy...
February 12, 2017: Acta Histochemica
https://www.readbyqxmd.com/read/28198407/comparative-proteomic-analysis-of-horseweed-conyza-canadensis-biotypes-identifies-candidate-proteins-for-glyphosate-resistance
#7
Fidel González-Torralva, Adrian P Brown, Stephen Chivasa
Emergence of glyphosate-resistant horseweed (Conyza canadensis) biotypes is an example of how unrelenting use of a single mode of action herbicide in agricultural weed control drives genetic adaptation in targeted species. While in other weeds glyphosate resistance arose from target site mutation or target gene amplification, the resistance mechanism in horseweed uses neither of these, being instead linked to reduced herbicide uptake and/or translocation. The molecular components underpinning horseweed glyphosate-resistance remain unknown...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28197851/toxicity-of-pesticide-tank-mixtures-from-rice-crops-against-telenomus-podisi-ashmead-hymenoptera-platygastridae
#8
J de B Pazini, R A Pasini, M Rakes, F S de Armas, E J Seidel, J F da S Martins, A D Grützmacher
The use of insecticides, herbicides, and fungicides commonly occurs in mixtures in tanks in order to control phytosanitary problems in crops. However, there is no information regarding the effects of these mixtures on non-target organisms associated to the rice agroecosystem. The aim of this study was to know the toxicity of pesticide tank mixtures from rice crops against Telenomus podisi Ashmead (Hymenoptera: Platygastridae). Based on the methods adapted from the International Organisation for Biological and Integrated Control of Noxious Animals and Plants (IOBC), adults of T...
February 14, 2017: Neotropical Entomology
https://www.readbyqxmd.com/read/28197704/effect-of-quaternary-ammonium-salts-with-fluorine-atoms-on-selected-weed-species
#9
Robert Biczak, Barbara Pawłowska, Maciej Płatkowski, Michał Stręk, Arkadiusz Telesiński
This study investigated the effects of four structurally different quaternary ammonium salts (QASs), i.e., tetrabutylammonium tetrafluoroborate [TBA][BF4], tetrahexylammonium tetrafluoroborate [THA][BF4], tetrabutylammonium hexafluorophosphate [TBA][PF6], and tetrahexylammonium hexafluorophosphate [THA][PF6], on the growth and development of three weed species: gallant soldier (Galinsoga parviflora Cav.), white goosefoot (Chenopodium album L.) and common sorrel (Rumex acetosa L.). The examined compounds were applied in the form of foliar spraying and soil application...
February 14, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28196091/pre-breeding-of-lentil-lens-culinaris-medik-for-herbicide-resistance-through-seed-mutagenesis
#10
Muhammad Rizwan, Muhammad Aslam, Muhammad Jawad Asghar, Ghulam Abbas, Tariq Mahmud Shah, Hussein Shimelis
Lentil is a poor competitor of weeds and its sensitivity to herbicides is a major hurdle for large scale production. The present study was conducted to select herbicide resistant lentil genotypes through seed mutagenesis. Seeds of three advanced lentil genotypes (LPP 11001, LPP 11100 and LPP 11116) were treated with two different concentrations of ethyl methanesulfonate (EMS; 0.1 and 0.2%), hydrazine hydrate (HH; 0.02 and 0.03%) and sodium azide (SA; 0.01 and 0.02%) to develop M1 seed. The M2 was screened against two herbicides including Ally Max 28...
2017: PloS One
https://www.readbyqxmd.com/read/28192998/monitoring-herbicide-concentrations-and-loads-during-a-flood-event-a-comparison-of-grab-sampling-with-passive-sampling
#11
Andrew Joseph Novic, Dominique S O'Brien, Sarit Leat Kaserzon, Darryl W Hawker, Stephen E Lewis, Jochen F Mueller
The suitability of passive samplers (Chemcatcher) as an alternative to grab sampling in estimating time-weighted average (TWA) concentrations and total loads of herbicides was assessed. Grab sampling complemented deployments of passive samplers in a tropical waterway in Queensland, Australia, before, during and after a flood event. Good agreement was observed between the two sampling modes in estimating TWA concentrations that was independent of herbicide concentrations ranging over two orders of magnitude...
February 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28190575/water-quality-variables-and-pollution-sources-shaping-stream-macroinvertebrate-communities
#12
Elisabeth Berger, Peter Haase, Mathias Kuemmerlen, Moritz Leps, Ralf Bernhard Schäfer, Andrea Sundermann
In 2015, over 90 percent of German rivers failed to reach a good ecological status as demanded by the EU Water Framework Directive (WFD). Deficits in water quality, mainly from diffuse pollution such as agricultural run-off, but also from wastewater treatment plants (WWTPs), have been suggested as important drivers of this decline in ecological quality. We modelled six macroinvertebrate based metrics indicating ecological quality for 184 streams in response to a) PCA-derived water quality gradients, b) individual water quality variables and c) catchment land use and wastewater exposure indices as pollution drivers...
February 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28188590/pesticide-stress-on-plants-negatively-affects-parasitoid-fitness-through-a-bypass-of-their-phytophage-hosts
#13
Andries A Kampfraath, Daniel Giesen, Cornelis A M van Gestel, Cécile Le Lann
Pesticides taken up by plants from the soil or interstitial (pore) water can cascade to higher trophic levels, which are expected to be more affected due to cumulative bottom-up effects. Knowledge about the impact of indirect exposure to pesticides on non-target terrestrial trophic chains, however, is still lacking. Therefore, we examined the direct and indirect effects of three concentrations of the herbicide 2,6-dichlorobenzonitrile (DCBN) and an insecticide with a similar molecular structure (1,4-dichlorobenzene, DCB) on the fitness traits of a tritrophic system: the wheat plant Triticum aestivum, the aphid Sitobion avenae and its specialist parasitoid Aphidius rhopalosiphi...
February 10, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28188550/quantification-of-the-fate-of-mesotrione-applied-alone-or-in-a-herbicide-mixture-in-two-brazilian-arable-soils
#14
Kassio Ferreira Mendes, Bianca Assis Barbosa Martins, Marcelo Rodrigues Dos Reis, Rodrigo Floriano Pimpinato, Valdemar Luiz Tornisielo
The effects of mesotrione, S-metolachlor, and terbuthylazine, applied in mixture, on soil biodegradation remain insufficiently researched. However, herbicide mixtures have been a common practice in agricultural systems in the last years. Understanding the fate of soil-applied herbicides may help on planning weed management tactics towards more sustainable and efficient weed control. Therefore, this study evaluated the fate of mesotrione alone and in mixture with S-metolachlor and terbuthylazine when applied to two contrasting arable Brazilian soils...
February 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28188320/effects-of-glyphosate-based-herbicide-sub-lethal-concentrations-on-fish-feeding-behavior
#15
Percilia Cardoso Giaquinto, Marina Borges de Sá, Vanessa Seiko Sugihara, Bruno Bastos Gonçalves, Helton Carlos Delício, Assaf Barki
Glyphosate-based herbicides are widely used in agricultural systems. Although the target organism are particularly plant organisms, there are numerous studies showing adverse effects in aquatic animals, such as inhibition of acetyl cholinesterase, effects on kidney, liver, and gill and stressors effects. This study analyzed the effects of commercial formulation of glyphosate on feeding behavior in Pacu (Piaractus mesopotamicus). Fish were exposed to three glyphosate concentrations (0.2, 0.6, and 1.8 ppm) for 15 days...
February 10, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28187829/cross-resistance-patterns-to-acetolactate-synthase-als-inhibiting-herbicides-of-flixweed-descurainia-sophia-l-conferred-by-different-combinations-of-als-isozymes-with-a-pro-197-thr-mutation-or-a-novel-trp-574-leu-mutation
#16
Wei Deng, Qian Yang, Yongzhi Zhang, Hongtao Jiao, Yu Mei, Xuefeng Li, Mingqi Zheng
Acetolactate synthase (ALS) is the common target of ALS-inhibiting herbicides, and target-site ALS mutations are the main mechanism of resistance to ALS-inhibiting herbicides. In this study, ALS1 and ALS2 genes with full lengths of 2004bp and 1998bp respectively were cloned in individual plants of susceptible (S) or resistant (R) flixweed (Descurainia sophia L.) populations. Two ALS mutations of Pro-197-Thr and/or Trp-574-Leu were identified in plants of three R biotypes (HB24, HB30 and HB42). In order to investigate the function of ALS isozymes in ALS-inhibiting herbicide resistance, pHB24 (a Pro-197-Thr mutation in ALS1 and a wild type ALS2), pHB42 (a Trp-574-Leu mutation in ALS1 and a wild type ALS2) and pHB30 (a Trp-574-Leu mutation in ALS1 and a Pro-197-Thr mutation in ALS2) subpopulations individually homozygous for different ALS mutations were generated...
March 2017: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/28186385/activating-nuclear-xenobiotic-receptors-and-triggering-er-stress-and-hepatic-cytochromes-p450-systems-in-quails-coturnix-c-coturnix-during-atrazine-exposure
#17
Zheng-Hai Du, Lei Qin, Jia Lin, Yan-Chun Sun, Jun Xia, Cong Zhang, Xue-Nan Li, Jin-Long Li
Atrazine (ATR) is one of the most widely detected contaminant in the ecosystem. Nuclear xenobiotic receptors are activated by herbicides and induce the transcription of CYP450 isoforms involved in xenobiotic metabolism and transport. However, little is known about hepatic nuclear xenobiotic receptors in birds are responsible for ATR-induced hepatotoxicity via regulating the cytochrome P450 enzyme systems (CYP450s). The objective of this study was to investigate the mechanism of ATR hepatotoxicity in quails...
February 10, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28186362/effects-of-the-herbicide-triclopyr-on-metamorphic-northern-red-legged-frogs
#18
Amy E Yahnke, Christian E Grue, Marc P Hayes, Schuyler Pearman-Gillman
Aquatic herbicides are used to manage invasive emergent plants in and around wetlands. Metamorphic frogs that emerge during the aquatic weed management season may be at risk of herbicide exposure. Metamorphic northern red-legged frogs (Rana aurora) were exposed to a triclopyr tank mix labelled for control of broadleaf emergent aquatic weeds such as invasive purple loosestrife (Lythrum salicaria). The tank mix consisted of Renovate® 3 (triclopyr triethylamine salt [TEA] 44.4%), the modified vegetable oil surfactant Competitor®, and marker dye Hi-Light®...
February 10, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28185156/imi-resistance-associated-to-crop-weed-hybridization-in-a-natural-brassica-rapa-population-characterization-and-fate
#19
M S Ureta, F Torres Carbonell, C Pandolfo, A D Presotto, M A Cantamutto, M Poverene
Wild turnip (Brassica rapa) is a common weed and a close relative to oilseed rape (Brassica napus). The Clearfield® production system is a highly adopted tool which provides an alternative solution for weed management, but its efficiency is threatened by gene transfer from crop to weed relatives. Crop-weed hybrids with herbicide resistance were found in the progeny of a B. rapa population gathered from a weedy stand on the borders of an oilseed rape (B. napus) imidazolinone (IMI)-resistant crop. Interspecific hybrids were confirmed by morphological traits in the greenhouse and experimental field, survival after imazethapyr applications, DNA content through flow cytometry, and pollen viability...
March 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28179981/deep-assessment-of-genomic-diversity-in-cassava-for-herbicide-tolerance-and-starch-biosynthesis
#20
Jorge Duitama, Lina Kafuri, Daniel Tello, Ana María Leiva, Bernhard Hofinger, Sneha Datta, Zaida Lentini, Ericson Aranzales, Bradley Till, Hernán Ceballos
Cassava is one of the most important food security crops in tropical countries, and a competitive resource for the starch, food, feed and ethanol industries. However, genomics research in this crop is much less developed compared to other economically important crops such as rice or maize. The International Center for Tropical Agriculture (CIAT) maintains the largest cassava germplasm collection in the world. Unfortunately, the genetic potential of this diversity for breeding programs remains underexploited due to the difficulties in phenotypic screening and lack of deep genomic information about the different accessions...
2017: Computational and Structural Biotechnology Journal
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