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https://www.readbyqxmd.com/read/28445651/herbicide-targets-and-detoxification-proteins-in-sugarcane-from-gene-assembly-to-structure-modelling
#1
Dyfed Lloyd Evans, Shailesh Vinay Joshi
In a genome context, sugarcane is a classic orphan crop, in that no genome and only very few genes have been assembled. We have devised a novel exome assembly methodology that has allowed us to assemble and characterize 49 genes that serve as herbicide targets, safener interacting proteins and members of herbicide detoxification pathways within the sugarcane genome. We have structurally modelled the products of each of these genes, as well as determining allelic, genomic and RNA-Seq based polymorphisms for each gene...
April 26, 2017: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28445394/spectroscopic-detection-of-glyphosate-in-water-assisted-by-laser-ablated-silver-nanoparticles
#2
Rafael Eleodoro De Góes, Marcia Muller, José Luís Fabris
Glyphosate is one of the most widely used herbicides in the world. Its safety for both human health and aquatic biomes is a subject of wide debate. There are limits to glyphosate's presence in bodies of water, and it is usually detected through complex analytical procedures. In this work, the presence of glyphosate is detected directly through optical interrogation of aqueous solution. For this purpose, silver nanoparticles were produced by pulsed laser ablation in liquids. Limits of detection of 0.9 mg/L and 3...
April 26, 2017: Sensors
https://www.readbyqxmd.com/read/28444907/plant-reproduction-is-altered-by-simulated-herbicide-drift-to-constructed-plant-communities
#3
David Olszyk, Thomas Pfleeger, Tamotsu Shiroyama, Matthew Blakeley-Smith, E Henry Lee, Milton Plocher
Herbicide drift may have unintended impacts on native vegetation, adversely affecting individual species and plant communities. To determine potential ecological effects of herbicide drift, small plant community plots were constructed using nine perennial species found in different Willamette Valley Oregon grassland habitats. Studies were conducted at two Oregon State University farms in two separate years, with single and combined treatments of 0.01 to 0.2 x field application rates (f.a.r.) of 1119 g ha(-1) for glyphosate [active ingredient (a...
April 26, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28444878/what-do-farmers-weed-control-decisions-imply-about-glyphosate-resistance-evidence-from-surveys-of-u-s-corn-fields
#4
Seth J Wechsler, Jonathan R McFadden, David J Smith
BACKGROUND: The first case of glyphosate-resistant weeds in the United States was documented in 1998, two years after the commercialization of genetically-engineered herbicide-resistant (HR) corn and soybeans. Currently, over 15 glyphosate-resistant weed species affect U.S. crop production areas. These weeds have the potential to reduce yields, increase costs, and lower farm profitability. The objective of our study is to develop a behavioral model of farmers' weed management decisions and use it to analyze weed resistance to glyphosate in U...
April 26, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28443128/physiological-and-molecular-characterization-of-hydroxyphenylpyruvate-dioxygenase-hppd-inhibitor-resistance-in-palmer-amaranth-amaranthus-palmeri-s-wats
#5
Sridevi Nakka, Amar S Godar, Prashant S Wani, Curtis R Thompson, Dallas E Peterson, Jeroen Roelofs, Mithila Jugulam
Herbicides that inhibit hydroxyphenylpyruvate dioxygenase (HPPD) such as mesotrione are widely used to control a broad spectrum of weeds in agriculture. Amaranthus palmeri is an economically troublesome weed throughout the United States. The first case of evolution of resistance to HPPD-inhibiting herbicides in A. palmeri was documented in Kansas (KS) and later in Nebraska (NE). The objective of this study was to investigate the mechansim of HPPD-inhibitor (mesotrione) resistance in A. palmeri. Dose response analysis revealed that this population (KSR) was 10-18 times more resistant than their sensitive counterparts (MSS or KSS)...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28439681/side-effects-of-pesticides-used-in-irrigated-rice-areas-on-telenomus-podisi-ashmead-hymenoptera-platygastridae
#6
Juliano de Bastos Pazini, Rafael Antonio Pasini, Enio Júnior Seidel, Matheus Rakes, José Francisco da Silva Martins, Anderson Dionei Grützmacher
Telenomus podisi Ashmead (Hymenoptera: Platygastridae) is an important agent for the biological control of stink bug eggs in irrigated rice areas and the best strategy for its preservation is the use of selective pesticides. The aim of this study was to know the side-effects of pesticides used in Brazilian irrigated rice areas on egg parasitoid T. podisi. We evaluated, under laboratory conditions, 13 insecticides, 11 fungicides, 11 herbicides, and a control (distilled water) in choice and no-choice tests. In the no-choice tests, the pesticides were sprayed at pre and post-parasitism stages (egg and larval stages of T...
April 24, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28436172/indaziflam-a-new-cellulose-biosynthesis-inhibiting-herbicide-provides-long-term-control-of-invasive-winter-annual-grasses
#7
Derek J Sebastian, Margaret B Fleming, Eric L Patterson, James R Sebastian, Scott J Nissen
BACKGROUND: Indaziflam (Esplanade™, Bayer CropScience) is a cellulose biosynthesis inhibiting (CBI) herbicide that is a unique mode of action for resistance management and has broad spectrum activity at low application rates. This research further explores indaziflam's activity on monocotyledons and dicotyledons, and evaluates indaziflam's potential for restoring non-crop sites infested with invasive winter annual grasses. RESULTS: Treated Arabidopsis, downy brome, feral rye, and kochia were all susceptible to indaziflam in a dose-dependent manner...
April 24, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28434228/rapid-biodegradation-of-the-herbicide-2-4-dichlorophenoxyacetic-acid-by-cupriavidus-gilardii-t-1
#8
Xiangwei Wu, Wenbo Wang, Junwei Liu, Dandan Pan, Xiaohui Tu, Pei Lv, Yi Wang, Haiqun Cao, Yawen Wang, Rimao Hua
Phytotoxicity and environmental pollution of residual herbicides have caused much public concern during the past several decades. An indigenous bacterial strain capable of degrading 2,4-dichlorophenoxyacetic acid (2,4-D), designated T-1, was isolated from soybean field soil and identified as Cupriavidus gilardii. The strain T-1 degraded 2,4-D 3.39 times faster than the model strain Cupriavidus necator JMP134. T-1 could also efficiently degrade 2-methyl-4-chloro-phenoxyacetic acid (MCPA), MCPA isooctyl ester, and 2-(2,4-dicholrophenoxy)-propionic acid (2,4-DP)...
April 24, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28434178/massilia-chloroacetimidivorans-sp-nov-a-chloroacetamide-herbicide-degrading-bacterium-isolated-from-soil
#9
Hyosun Lee, Dong-Uk Kim, Sooyeon Park, Jung-Hoon Yoon, Jong-Ok Ka
A Gram-stain negative, rod-shaped, aerobic bacterial strain, designated TA-C7e(T), was isolated from an agricultural soil obtained from Taean region, Korea. Phylogenetically, the strain was grouped with the genus Massilia and shared 95.33-97.97% 16S rRNA sequence similarity with the type strains of other species of the genus Massilia. The DNA-DNA hybridisation between TA-C7e(T) and Massilia haematophila KACC 13771(T), Massilia suwonesis KACC 12635(T), and Massilia yuzhufengensis KACC 16569(T) revealed a low level of relatedness (<40%)...
April 22, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28432770/chiral-separation-of-aryloxyphenoxy-propionate-herbicides-in-a-permethyl-%C3%AE-cyclodextrin-based-column-influence-of-temperature-and-mobile-phase-composition-on-enantioselectivity
#10
Ester Lubomirsky, Héctor Di Loreto, Juan M Padró, Cecilia B Castells
We used a permethyl-β-cyclodextrin chiral stationary phase under reversed-phase conditions for the chiral separation of four aryloxyphenoxy-propionate herbicides (fenoxaprop-p-ethyl, quizalofop-p-ethyl and tefuryl and haloxyfop-p-methyl) with mixtures of methanol, ethanol, 2-propanol, n-propanol, tert-butanol, or acetonitrile and water as mobile phases and investigated the influence of mobile phase composition and column temperature (from 0 to 50 °C) on the separation. The retention factors (k) and selectivity factors (α) of all the herbicides investigated decreased with increasing temperature...
April 22, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28431786/-ligninolytic-enzyme-production-by-white-rot-fungi-during-paraquat-herbicide-degradation
#11
Reyna L Camacho-Morales, José Luis Gerardo-Gerardo, Karina Guillén Navarro, José E Sánchez
Paraquat is a widely used herbicide in agriculture. Its inappropriate use and wide distribution represents a serious pollution problem for soil and water. White rot fungi are capable of degrading pollutants having a similar structure to that of lignin, such as paraquat. This study evaluated the degradation effect of paraquat on the production of ligninolytic enzymes by white rot fungi isolated from the South of Mexico. Six fungal strains showed tolerance to the herbicide in solid culture. Three of the six evaluated strains showed levels of degradation of 32, 26 and 47% (Polyporus tricholoma, Cilindrobasidium laeve and Deconica citrispora, respectively) after twelve days of cultivation in the presence of the xenobiotic...
April 18, 2017: Revista Argentina de Microbiología
https://www.readbyqxmd.com/read/28429727/selection-of-relatively-exact-reference-genes-for-gene-expression-studies-in-goosegrass-eleusine-indica-under-herbicide-stress
#12
Jingchao Chen, Zhaofeng Huang, Hongjuan Huang, Shouhui Wei, Yan Liu, Cuilan Jiang, Jie Zhang, Chaoxian Zhang
Goosegrass (Eleusine indica) is one of the most serious annual grassy weeds worldwide, and its evolved herbicide-resistant populations are more difficult to control. Quantitative real-time PCR (qPCR) is a common technique for investigating the resistance mechanism; however, there is as yet no report on the systematic selection of stable reference genes for goosegrass. This study proposed to test the expression stability of 9 candidate reference genes in goosegrass in different tissues and developmental stages and under stress from three types of herbicide...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28426703/effects-of-over-expressing-a-native-gene-encoding-5-enolpyruvylshikimate-3-phosphate-synthase-epsps-on-glyphosate-resistance-in-arabidopsis-thaliana
#13
Xiao Yang, Zachery T Beres, Lin Jin, Jason T Parrish, Wanying Zhao, David Mackey, Allison A Snow
Widespread overuse of the herbicide glyphosate, the active ingredient in RoundUp®, has led to the evolution of glyphosate-resistant weed biotypes, some of which persist by overproducing the herbicide's target enzyme, 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS). EPSPS is a key enzyme in the shikimic acid pathway for biosynthesis of aromatic amino acids, lignin, and defensive compounds, but little is known about how overproducing EPSPS affects downstream metabolites, growth, or lifetime fitness in the absence of glyphosate...
2017: PloS One
https://www.readbyqxmd.com/read/28424880/herbicide-toxicity-testing-with-non-target-boreal-plants-the-sensitivity-of-achillea-millefolium-l-and-chamerion-angustifolium-l-to-triclopyr-and-imazapyr
#14
Krystal M Isbister, Eric G Lamb, Katherine J Stewart
Terrestrial plant toxicity tests were conducted to determine the sensitivity of two boreal plants, yarrow (Achillea millefolium L.) and fireweed (Chamerion angustifolium L.), to the herbicides imazapyr and triclopyr. Both plants are common non-target species on northern powerline rights-of-way where the impacts of proposed herbicide applications are of concern. In the vegetative vigour test, triclopyr foliar spray caused extensive damage to A. millefolium at <50% of the maximum field application rate (inhibition concentration (IC)50 = 1443...
April 19, 2017: Environmental Management
https://www.readbyqxmd.com/read/28424723/evidence-mechanism-and-alternative-chemical-seedbank-level-control-of-glyphosate-resistance-of-a-rigid-ryegrass-lolium-rigidum-biotype-from-southern-spain
#15
Pablo T Fernández-Moreno, Fernando Bastida, Rafael De Prado
Rigid ryegrass (Lolium rigidum) is one of the most troublesome weeds in different crops in the Mediterranean region. A rigid ryegrass biotype from an olive grove in Jaén province (Andalusía, southern Spain), potentially resistant to glyphosate (RG), was tested for its resistance level through dose-response assays using a susceptible biotype (SG). To test the hypothesis of a non-target-site-based resistance, as point mutations are far less common mechanisms of glyphosate resistance, studies were also conducted to elucidate whether resistance was associated with biochemical, metabolism, molecular and/or physiological mechanisms...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28422580/glyphosate-and-paraquat-in-maternal-and-fetal-serums-in-thai-women
#16
Pornpimol Kongtip, Noppanun Nangkongnab, Ratanavadee Phupancharoensuk, Chonlada Palarach, Dusit Sujirarat, Supha Sangprasert, Malasod Sermsuk, Namthip Sawattrakool, Susan Renee Woskie
OBJECTIVES: This longitudinal study measured the glyphosate and paraquat concentrations found in maternal and umbilical cord serum in 82 pregnant women who gave birth in three provinces of Thailand. METHODS: Through questionnaires and biological samples collected at childbirth, factors such as personal characteristics, occupation, agricultural activities, and herbicide use in agricultural work were evaluated as predictors of glyphosate and paraquat levels in the pregnant women...
April 19, 2017: Journal of Agromedicine
https://www.readbyqxmd.com/read/28422495/cochliotoxin-a-dihydropyranopyran-4-5-dione-and-its-analogues-produced-by-cochliobolus-australiensis-display-phytotoxic-activity-against-buffelgrass-cenchrus-ciliaris
#17
Marco Masi, Susan Meyer, Suzette Clement, Alessio Cimmino, Massimo Cristofaro, Antonio Evidente
Buffelgrass (Pennisetum ciliare or Cenchrus ciliaris) is a perennial grass that has become highly invasive in the Sonoran Desert of southern Arizona. In the search for novel control strategies against this weed, strains of the foliar fungal pathogen Cochliobolus australiensis from buffelgrass have been screened for their ability to produce phytotoxic metabolites that could potentially be used as natural herbicides in an integrated pest management strategy. A new phytotoxin, named cochliotoxin, was isolated from liquid culture of this fungus together with radicinin, radicinol, and their 3-epimers...
April 19, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28421825/seizures-in-patients-with-acute-pesticide-intoxication-with-a-focus-on-glufosinate-ammonium
#18
S Park, D E Kim, S Y Park, H W Gil, S Y Hong
The incidence and clinical aspects of seizures remain to be elucidated in patients with acute pesticide intoxication. The present study included subjects who ingested pesticide with the intention of committing suicide and were treated at Soonchunhyang University Hospital (Cheonan, Korea) between January 2011 and December 2014. We analyzed the incidence and characterized the type and frequency of seizure, from the medical records of 464 patients with acute pesticide intoxication, according to the pesticide class...
January 1, 2017: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/28421627/impact-of-microorganisms-humidity-and-temperature-on-the-enantioselective-degradation-of-imazethapyr-in-two-soils
#19
REVIEW
Hao Wu, Xiaolin He, Huifen Dong, Qingyan Zhou, Yongsong Zhang
Imazethapyr (IM) is a chiral herbicide composed of an (-)-R-enantiomer and an (+)-S-enantiomer with differential herbicidal activity. In this study, the effects of microbial organisms, humidity, and temperature on the selective degradation of the (-)-R- and (+)-S-enantiomers of IM were determined in silty loam (SL) and clay loam (CL) soil with different pH values. The (-)-R-enantiomer of IM was preferentially degraded in two soils under different microorganism, humidity, and temperature conditions. The average half-lives of R-IM ranged from 43 to 66...
April 19, 2017: Chirality
https://www.readbyqxmd.com/read/28421101/hyperspectral-technologies-for-assessing-seed-germination-and-trifloxysulfuron-methyl-response-in-amaranthus-palmeri-palmer-amaranth
#20
Maor Matzrafi, Ittai Herrmann, Christian Nansen, Tom Kliper, Yotam Zait, Timea Ignat, Dana Siso, Baruch Rubin, Arnon Karnieli, Hanan Eizenberg
Weed infestations in agricultural systems constitute a serious challenge to agricultural sustainability and food security worldwide. Amaranthus palmeri S. Watson (Palmer amaranth) is one of the most noxious weeds causing significant yield reductions in various crops. The ability to estimate seed viability and herbicide susceptibility is a key factor in the development of a long-term management strategy, particularly since the misuse of herbicides is driving the evolution of herbicide response in various weed species...
2017: Frontiers in Plant Science
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