Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"glyphosate-resistance"”.
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Glyphosate Resistance in Plant Cell Cultures
… in order to identify the mechanism underlying glyphosate resistance. Uptake experiments, using radiolabelled glyphosate, showed higher or similar absorption levels in the resistant lines compared to the unselected control. Such results exclude uptake as a mechanism of glyphosate resistance. …
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Examination of target-site-based mechanisms of glyphosate resistance in waterhemp (Amaranthus tuberculatus)
Glyphosate is one of the most important and widely used herbicide in the world. While few weed species had evolved resistance in the two decades after glyphosate’s commercialization in 1974, an overreliance on glyphosate and lack of diversity in weed control methods following the introduction of …
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Control, Assessment and Glyphosate Resistance of Palmer Amaranth (Amaranthus palmeri S. Wats) in Virginia
Glyphosate resistant crops were rapidly adopted by farmers since their introduction in 1996 and currently, greater than 90% of cotton and soybean crops are glyphosate resistant. Glyphosate has been an effective mean for controlling Palmer amaranth, however overreliance on glyphosate based systems …
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EPSPS gene duplication in Palmer amaranth: relative fitness, inheritance, and duplication mechanism of the glyphosate resistance trait
Glyphosate resistant (GR) Palmer amaranth (Amaranthus palmeri S. Wats.) is a weedy plant species that has invaded agricultural fields in at least 25 states, raising the cost of weed control to more than 4x the original cost. In most areas, the resistance is conferred through a gene amplification …
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Weed resistance risk management in glyphosate-resistant cotton
The introduction of glyphosate resistance into Australian cotton systems will have an effect on conventional weed management practices, the weed species present and the risk of glyphosate resistance evolving in weed species. Therefore, it is important that the effects of these management practices, …
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Regional whole plant and molecular response of Kochia scoparia to glyphosate
Globally, glyphosate (Roundup®) resistant weeds pose a serious challenge to modern agricultural practices that utilize glyphosate for weed control, including Roundup Ready® cropping regimes. Locally, glyphosate resistant Kochia scoparia have been identified throughout the central Great Plains, and …
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A waterhemp saga: Seed production, genetics, hybridization, and the creation and discovery of quad-stack individuals
… of this species is its propensity to evolve resistance to herbicides—a feat which it has now accomplished for herbicides with four different modes of action, with the evolution of resistance to other herbicide modes of action expected in the future. Options for chemical control of this …
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Resistance to Als-Inhibiting Herbicides in Common Ragweed, Foxtail and Horseweed
… to investigate the evolution of cloransulam resistance in common ragweed, which appeared in the same year as cloransulam was commercialized. The results revealed that resistance to cloransulam in common ragweed evolved in response to selection by ALS inhibitors other than cloransulam. Also, …
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From the simple to the complex: an examination of different herbicide resistances
Herbicide resistance is the result of an evolutionary adaptation that some agronomic weed species have obtained from intense human-driven selection. The mechanisms by which these plants resist herbicides can be diverse. For example, self-pollinating species, such as goosegrass (Eleusine indica), …
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Reduced Chemical Weed Control Options in Virginia for Corn and Turfgrass and Characterization of Sorghum halepense Expressing Multiple Resistance to Nicosulfuron and Glyphosate
… agriculture's most pressing problems- herbicide resistance. Research conducted in Virginia sought to explore the effects of integrating multiple weed management tactics in corn and cool-season turfgrass. Additionally, research was conducted to confirm nicosulfuron and glyphosate herbicide …
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Soybean Maturity Group Tradeoffs: Irrigation, Weed Control, and Nitrogen Fixation
… group in response to agricultural issues of glyphosate resistance and declining ground water supply in the Arkansas delta region. Chapter III will jointly examine irrigation application amounts and nitrogen fixation amounts across soybean maturity group to establish tradeoffs of yield impacts …
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Structure of the amplified 5-enolpyruvylshikimate-3-phosphate synthase gene in glyphosate-resistant carrot cells and attempts to isolate the anthranilate synthase gene from plants
… suspension cultured cell lines selected for glyphosate resistance was carried out to determine the mechanism of gene amplification in this plant system. Cloning of the EPSPS gene and 5$\sp\prime$ flanking sequences was carried out and two different DNA structures were revealed. The 13 kbp …
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Herbicide resistant weeds in Missouri : sources and solutions
… twice the recommended field use rate of glyphosate, glufosinate, 2,4-D, dicamba, and cloransulam was applied to each population in order to determine the frequency and distribution of herbicide resistances in Missouri horseweed. A population was classified as resistant if visual control …
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Distribution and Control of Herbicide-Resistant Italian Ryegrass (Lolium perenne L. ssp. multiflorum Lam. Husnot) in Arkansas
<p>Italian ryegrass populations have evolved resistance to herbicides that producers rely on for weed control both in wheat and burn-down. The objectives of this research were to: test populations of Italian ryegrass from across Arkansas for resistance to glyphosate, diclofop, pinoxaden, and …
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Use of Fluridone for Control of Palmer Amaranth (Amaranthus palmeri) in Cotton (Gossypium hirsutum) and on Ditchbanks
<p>Since 2006, glyphosate-resistant Palmer amaranth has been considered the most problematic weed in agronomic crops across the Midsouth. As a result of glyphosate resistance, producers began to again utilize a diverse herbicide program for management of this weed, which consists of several …
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Investigating the heritability of resistance fueling copy number variation in glyphosate resistant Amaranthus palmeri
… agent targeting and promoting the evolution of resistance in agricultural weed populations. In Amaranthus palmeri, CNV of the EPSPS gene, the target of glyphosate herbicide, ranges from 1 to over 160 copies, and is the primary genetic determinant of glyphosate resistance. The amplified copies of …
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Resistance Screening and Control Options for Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) in Cotton (Gossypium hirsutum)
<p>In the mid-2000's, glyphosate-resistant Palmer amaranth biotypes began to emerge in many southern states. In 2006, glyphosate-resistant Palmer amaranth was identified in a field in Mississippi County, Arkansas. A greenhouse experiment was conducted in 2008 to screen Palmer amaranth accessions, …
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The Role Of Soil Microorganisms In The Resistance Of Giant Ragweed, Horseweed, And Common Lambsquarters To Glyphosate
<p>Continuous glyphosate use has contributed to an increasing number of problematic glyphosate-resistant (GR) weeds. The mechanism of resistance in many GR weeds is poorly understood, in part, due to a poor understanding of how exactly glyphosate kills a plant. In previous research, the efficacy of …
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EFFECTS OF ANTHROPOGENIC SELECTION PRESSURE ON THE EVOLUTION OF A COMMON AGRICULTURAL WEED: DOES ADAPTATION COME WITH A DETECTABLE COST? A STUDY OF GLYPHOSATE-RESISTANT (GR) AND -SUSCEPTIBLE (GS) BIOTYPES OF Conyza canadensis
As the acreage of glyphosate-resistant (GR) cropping systems increases, so does the occurrence of herbicide-resistant weeds in the landscape. Biotypes of GR <italic>Conyza canadensis</italic> were first observed in Delaware, USA, in 2000. Since the first documentation of GR <italic>C. …
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Evaluation of Glyphosate Resistant Giant Ragweed (Ambrosia trifida) in Ohio Soybean (Glycine max) Fields
… were conducted in 2011 and 2012 to evaluate glyphosate resistant giant ragweed in Ohio soybean (Glycine max) fields. Specific objectives were as follows: 1) Determine the spatial distribution and incidence of giant ragweed (Ambrosia trifida) infestations in Ohio soybean fields at the end of …
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