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Articles 1 - 30 of 143
Full-Text Articles in Life Sciences
Managing Threats To The Urban Forest: From Dutch Elm Disease To Emerald Ash Borer - Learning From Experience, Christopher J. Borman
Managing Threats To The Urban Forest: From Dutch Elm Disease To Emerald Ash Borer - Learning From Experience, Christopher J. Borman
Doctor of Plant Health Program: Dissertations and Student Research
The urban forest provides important essential services to all municipalities; however, its value is often overlooked. The urban forest contributes to energy savings, environmental benefits, psychological well-being, and social benefits. Managing the urban forest in a sustainable manner is important if we wish to benefit from these services well into the future. Reliable management techniques have been created through previous experiences with pests, and these should be utilized and improved for use on urban forests.
American elm (Ulmus americana L.) was once a major component of the urban forests of North America. In 1927, Dutch elm disease (DED) was …
Metabolic Engineering Of Oilseed Crops To Produce High Levels Of Novel Acetyl Glyceride Oils With Reduced Viscosity, Freezing Point And Calorific Value, Jinjie Liu, Adam Rice, Kathleen Mcglew, Vincent Shaw, Hyunwoo Park, Thomas E. Clemente, Mike Pollard, John Ohlrogge, Timothy P. Durrett
Metabolic Engineering Of Oilseed Crops To Produce High Levels Of Novel Acetyl Glyceride Oils With Reduced Viscosity, Freezing Point And Calorific Value, Jinjie Liu, Adam Rice, Kathleen Mcglew, Vincent Shaw, Hyunwoo Park, Thomas E. Clemente, Mike Pollard, John Ohlrogge, Timothy P. Durrett
Department of Agronomy and Horticulture: Faculty Publications
Seed oils have proved recalcitrant to modification for the production of industrially useful lipids. Here, we demonstrate the successful metabolic engineering and subsequent field production of an oilseed crop with the highest accumulation of unusual oil achieved so far in transgenic plants. Previously, expression of the Euonymus alatus diacylglycerol acetyltransferase (EaDAcT) gene in wild-type Arabidopsis seeds resulted in the accumulation of 45 mol% of unusual 3-acetyl-1,2- diacyl-sn-glycerols (acetyl-TAGs) in the seed oil (Durrett et al., 2010 PNAS 107:9464). Expression of EaDAcT in dgat1 mutants compromised in their ability to synthesize regular triacylglycerols increased acetyl-TAGs to 65 mol%. Camelina and soybean …
Pacific Plug & Liner Crop Shrinkage Evaluation, Jillian Balli
Pacific Plug & Liner Crop Shrinkage Evaluation, Jillian Balli
Horticulture and Crop Science
Crop Shrinkage has a major impact on a company’s bottom line. There are many ways to combat shrinkage. This report focuses on shrinkage reduction by adjusting buffer planting numbers to reflect the actual number of plants lost in production. Inaccurate buffer can cause the cost of production to be inaccurate as well. This report evaluates crop shrinkage of a greenhouse located in Watsonville, CA called Pacific Plug & Liner.
Arkansas Soybean Performance Tests 2014, R. D. Bond, D. G. Dombek, J. A. Still
Arkansas Soybean Performance Tests 2014, R. D. Bond, D. G. Dombek, J. A. Still
Arkansas Agricultural Experiment Station Research Series
Soybean variety and strain performance tests are conducted each year in Arkansas by the University of Arkansas System Division of Agriculture Arkansas Crop Variety Improvement Program. The tests provide information to companies developing varieties and/or marketing seed within the State, and aid the Arkansas Cooperative Extension Service in formulating variety recommendations for soybean producers.
Functional Genomics And Microbiome Profiling Of The Asian Longhorned Beetle (Anoplophora Glabripennis) Reveal Insights Into The Digestive Physiology And Nutritional Ecology Of Wood Feeding Beetles, Erin D. Scully, Scott M. Geib, John E. Carlson, Ming Tien, Duane Mckenna, Kelli Hoover
Functional Genomics And Microbiome Profiling Of The Asian Longhorned Beetle (Anoplophora Glabripennis) Reveal Insights Into The Digestive Physiology And Nutritional Ecology Of Wood Feeding Beetles, Erin D. Scully, Scott M. Geib, John E. Carlson, Ming Tien, Duane Mckenna, Kelli Hoover
Department of Agronomy and Horticulture: Faculty Publications
Background: Wood-feeding beetles harbor an ecologically rich and taxonomically diverse assemblage of gut microbes that appear to promote survival in woody tissue, which is devoid of nitrogen and essential nutrients. Nevertheless, the contributions of these apparent symbionts to digestive physiology and nutritional ecology remain uncharacterized in most beetle lineages.
Results: Through parallel transcriptome profiling of beetle- and microbial- derived mRNAs, we demonstrate that the midgut microbiome of the Asian longhorned beetle (Anoplophora glabripennis), a member of the beetle family Cerambycidae, is enriched in biosynthetic pathways for the synthesis of essential amino acids, vitamins, and sterols. Consequently, the midgut …
Screening Diverse Soybean Germplasm For Water-Logging Tolerance, John Franklin Carlin
Screening Diverse Soybean Germplasm For Water-Logging Tolerance, John Franklin Carlin
Graduate Theses and Dissertations
Water-logging can be detrimental to soybean growth and development; effects range from chlorosis and stunting to yield loss and plant death. Soybean response to, and the effects of, water-logging are dependent on the growth-stage of the plant at the initiation of water-logging. The objectives of this study were to screen a diverse soybean germplasm collection for water-logging tolerance (WLT) at both the V5 and R1 growth stage and to develop a method to screen soybean for WLT in greenhouse. One hundred thirty five genotypes consisting of historical genotypes, PIs, drought and WLT tolerant breeding lines were screened for WLT in …
Use Of Remote Imagery And Object-Based Image Methods To Count Plants In An Open-Field Container Nursery, Josue Nahun Leiva
Use Of Remote Imagery And Object-Based Image Methods To Count Plants In An Open-Field Container Nursery, Josue Nahun Leiva
Graduate Theses and Dissertations
In general, the nursery industry lacks an automated inventory control system. Object-based image analysis (OBIA) software and aerial images could be used to count plants in nurseries. The objectives of this research were: 1) to evaluate the effect of an unmanned aerial vehicle (UAV) flight altitude and plant canopy separation of container-grown plants on count accuracy using aerial images and 2) to evaluate the effect of plant canopy shape, presence of flowers, and plant status (living and dead) on counting accuracy of container-grown plants using remote sensing images. Images were analyzed using Feature Analyst® (FA) and an algorithm trained using …
Integration Of Herbicide Programs With Cultural And Mechanical Practices For Managing Glyphosate-Resistant Palmer Amaranth (Amaranthus Palmeri) In Soybean (Glycine Max), Holden Bell
Graduate Theses and Dissertations
Herbicide-resistant Palmer amaranth is the most troublesome weed in Arkansas row crops, causing producers to rely heavily on multiple mechanisms of action to reduce selection pressure for further evolution of herbicide resistance and to successfully produce a profitable crop. It is critical for the sustainability of weed management not only to adequately control this weed but also to reduce the soil seedbank using both non-chemical and chemical practices. Studies were conducted to determine the effect of soybean row spacing, seeding rate, and herbicide program on Palmer amaranth emergence, survival, and seed production in soybean, the effect of drill-seeded soybean population …
Studies To Characterize Heavy Metal Content And Migration From Recycled Polyethyleneterephthalate, Michael John-Ross Whitt
Studies To Characterize Heavy Metal Content And Migration From Recycled Polyethyleneterephthalate, Michael John-Ross Whitt
Master's Theses
Packaging Materials account for 31% of the world’s municipal solid waste. Agencies like the Environmental Protection Agency (EPA) and the Agency for Toxic Substances and Disease Registry (ATSDR) are pushing for the increased use of recycled thermoplastic materials. Polyethylene terephthalate (PET) is a commonly recycled thermoplastic which is used to package ready-to-eat fruits and vegetables. Most recycled polyethylene terephthalate (RPET) packaging materials contain heavy metal catalysts, the most common being antimony. The recent increased use of recycled plastic materials has been suspected as the source of increased human heavy metal exposure. In this study, cadmium, chromium, nickel, lead and antimony …
Comprehensive Characterization And Rna-Seq Profiling Of The Hd-Zip Transcription Factor Family In Soybean (Glycine Max) During Dehydration And Salt Stress, Vikas Belamkar, Nathan T. Weeks, Arvind K. Bharti, Andrew Farmer, Michelle A. Graham, Steven B. Cannon
Comprehensive Characterization And Rna-Seq Profiling Of The Hd-Zip Transcription Factor Family In Soybean (Glycine Max) During Dehydration And Salt Stress, Vikas Belamkar, Nathan T. Weeks, Arvind K. Bharti, Andrew Farmer, Michelle A. Graham, Steven B. Cannon
Department of Agronomy and Horticulture: Faculty Publications
Background:
The homeodomain leucine zipper (HD-Zip) transcription factor family is one of the largest plant specific superfamilies, and includes genes with roles in modulation of plant growth and response to environmental stresses. Many HD-Zip genes are characterized in Arabidopsis (Arabidopsis thaliana), and members of the family are being investigated for abiotic stress responses in rice (Oryza sativa), maize (Zea mays), poplar (Populus trichocarpa) and cucumber (Cucmis sativus). Findings in these species suggest HD-Zip genes as high priority candidates for crop improvement.
Results:
In this study we have identified members of …
Arkansas Corn And Grain Sorghum Performance Tests 2014, R. D/ Bond, D. G. Dombek, J. A. Still
Arkansas Corn And Grain Sorghum Performance Tests 2014, R. D/ Bond, D. G. Dombek, J. A. Still
Arkansas Agricultural Experiment Station Research Series
Corn and grain sorghum performance tests are conducted each year in Arkansas by the University of Arkansas System Division of Agriculture. The tests provide information to companies marketing seed within the state, and aid the Arkansas Cooperative Extension Service in formulating recommendations for producers.
Nurturing Native Plants: A Guide To Vegetative Propagation Of Native Woody Plants In Utah, Larry Rupp, Adrea Wheaton
Nurturing Native Plants: A Guide To Vegetative Propagation Of Native Woody Plants In Utah, Larry Rupp, Adrea Wheaton
CWEL Extension Fact Sheets
No abstract provided.
Experimental Approaches To Study Plant Cell Walls During Plant-Microbe Interactions, Ye Xia, Carloalberto Petti, Mark A. Williams, Seth Debolt
Experimental Approaches To Study Plant Cell Walls During Plant-Microbe Interactions, Ye Xia, Carloalberto Petti, Mark A. Williams, Seth Debolt
Horticulture Faculty Publications
Plant cell walls provide physical strength, regulate the passage of bio-molecules, and act as the first barrier of defense against biotic and abiotic stress. In addition to providing structural integrity, plant cell walls serve an important function in connecting cells to their extracellular environment by sensing and transducing signals to activate cellular responses, such as those that occur during pathogen infection. This mini review will summarize current experimental approaches used to study cell wall functions during plant-pathogen interactions. Focus will be paid to cell imaging, spectroscopic analyses, and metabolic profiling techniques.
The Involvement Of J-Protein Atdjc17 In Root Development In Arabidopsis, Carloalberto Petti, Meera Nair, Seth Debolt
The Involvement Of J-Protein Atdjc17 In Root Development In Arabidopsis, Carloalberto Petti, Meera Nair, Seth Debolt
Horticulture Faculty Publications
In a screen for root hair morphogenesis mutants in Arabidopsis thaliana L. we identified a T-DNA insertion within a type III J-protein AtDjC17 caused altered root hair development and reduced hair length. Root hairs were observed to develop from trichoblast and atrichoblast cell files in both Atdjc17 and 35S::AtDJC17. Localization of gene expression in the root using transgenic plants expressing proAtDjC17::GUS revealed constitutive expression in stele cells. No AtDJC17 expression was observed in epidermal, endodermal, or cortical layers. To explore the contrast between gene expression in the stele and epidermal phenotype, hand cut transverse sections of Atdjc17 roots were …
Haploid Induction Via In Vitro Gynogenesis In Tomato (Solanum Lycopersicum L.), He Zhao, Xiao-Xuan Wang, Yong-Cheng Du, De-Wei Zhu, Yan-Mei Guo, Jian-Chang Gao, Fei Li, John C. Snyder
Haploid Induction Via In Vitro Gynogenesis In Tomato (Solanum Lycopersicum L.), He Zhao, Xiao-Xuan Wang, Yong-Cheng Du, De-Wei Zhu, Yan-Mei Guo, Jian-Chang Gao, Fei Li, John C. Snyder
Horticulture Faculty Publications
In order to determine the potential for haploid induction via in vitro gynogenesis in tomato, the ovules and protoplasts of embryo sacs from the hybrids Zhongza 101 and Zhongza 105 were cultured. An efficient method of ovule isolation was established in this study. Using this method, 100-150 ovules could be isolated from one ovary. Isolated ovules were cultured on three induction media to induce gynogenesis in vitro. During culture, ovules were enlarged markedly, with opaque white color. When observed microscopically, there were cell divisions and cell clumps in embryo sacs. Subsequently, the cell clumps in embryo sacs ceased growth, likely …
Light-Emitting Diodes As An Alternative Supplemental Lighting Source For Greenhouse Tomato Propagation And Production, Celina Gomez Vargas
Light-Emitting Diodes As An Alternative Supplemental Lighting Source For Greenhouse Tomato Propagation And Production, Celina Gomez Vargas
Open Access Dissertations
Intensive year-round local production of greenhouse-grown tomatoes (Solanum lycopersicum L.) requires the use of supplemental lighting (SL) to complement solar radiation in light-limited seasonal climates. However, SL represents a large expense to greenhouse-vegetable production. Currently, energy is second only to labor as the most expensive indirect cost of production. Thus, the greenhouse industry is interested in cost-effective, energy-efficient sources of supplemental photosynthetic light to sustain steady supplies of high-quality produce during the off-season. Overhead (OH) high-pressure sodium (HPS) lamps are considered the industry standard in greenhouse SL because of their capability to deliver adequate photosynthetically active radiation (PAR …
Defining Management Strategies To Maximize Net Soil Carbon And Nitrogen Retention In Turfgrass Systems, Quincy D. Law
Defining Management Strategies To Maximize Net Soil Carbon And Nitrogen Retention In Turfgrass Systems, Quincy D. Law
Open Access Theses
Soil carbon (C) sequestration has been proposed as a method to reduce atmospheric carbon dioxide (CO2 ). Managed turf areas are both a source and a sink for greenhouse gases (GHGs) including CO 2 , methane (CH4 ), and nitrous oxide (N2 O), among others. Management practices, including turfgrass selection and mowing, influence the amount of C and N stored in the soil, as well as the direct and indirect GHG emissions. Thus, the objective of this research was to determine how turfgrass selection (both species and cultivar) and mowing practices (such as frequency and grass clipping management) influence the …
Identification And Characterization Of Factors Involved In Dna Demethylation And Anti-Silencing In Arabidopsis, Zhaobo Lang
Identification And Characterization Of Factors Involved In Dna Demethylation And Anti-Silencing In Arabidopsis, Zhaobo Lang
Open Access Dissertations
DNA methylation is a key epigenetic mark for transcriptional gene silencing in many eukaryotes. DNA methylation status can be dynamically controlled by methylation and active demethylation processes. Compared to the well-known mechanisms of DNA methylation, the mechanisms of DNA demethylation and its regulation are poorly understood. In order to better understand the DNA demethylation pathway, we developed two genetic screening systems in Arabidopsis to identify new components involved in the DNA demethylation. In the first system, which is based on 35S promoter driven SUC2 (sucrose transporter 2) transgene, a mutant (91-1) was isolated and map-based cloning identified the …
Using Energy-Efficient Technologies To Produce Bedding Plants And Microgreens In Protected And Controlled Environments, Joshua R. Gerovac
Using Energy-Efficient Technologies To Produce Bedding Plants And Microgreens In Protected And Controlled Environments, Joshua R. Gerovac
Open Access Theses
Gerovac, Joshua R. M.S., Purdue University, December 2014. Using Energy-Efficient Technologies to Produce Bedding Plants and Microgreens in Protected and Controlled Environments. Major Professor: Roberto G. Lopez. Production of bedding plants in commercial greenhouses (GHs) located in northern latitudes begins in late winter and continues through late spring when low outdoor temperatures generally necessitate active heating to maintain temperatures suitable for growth and development. Meanwhile, year-round production of microgreens using multi-layer systems requires sole-source (SS) photosynthetic lighting for production. Energy used to provide active heating in commercial GHs or SS lighting in multi-layer systems is second only to labor as …
Damping-Off, Claudia Nischwitz
Organic Treatments For Control Of Pepper Weevil (Coleoptera: Curculionidae), Karla M. Addesso, Philip A. Stansly, Barry C. Kostyk, Heather J. Mcauslane
Organic Treatments For Control Of Pepper Weevil (Coleoptera: Curculionidae), Karla M. Addesso, Philip A. Stansly, Barry C. Kostyk, Heather J. Mcauslane
Agricultural and Environmental Sciences Faculty Research
The pepper weevil, Anthonomus eugenii Cano (Coleoptera: Curculionidae) is a major pest of pepper (Capsicum spp.; Solanales: Solanaceae) in the southern United States, Mexico, Central America and the Caribbean. Feeding and oviposition cause flower and fruit abscission and internal fruit damage resulting in serious yield losses. Females lay eggs in flower buds and small fruits, shielding larvae from contact pesticides, leaving only the adult stage vulnerable. The purpose of this study was to investigate low-risk and organic products for use against the pepper weevil to provide both organic and conventional growers with more control options. A neem product (Ecozin® …
Cold Frames, High Tunnels, And Greenhouses: Choose A Growing Structure Best For You, Stacy A. Adams, Kim A. Todd
Cold Frames, High Tunnels, And Greenhouses: Choose A Growing Structure Best For You, Stacy A. Adams, Kim A. Todd
Department of Agronomy and Horticulture: Faculty Publications
Cold frames, high tunnels, and greenhouses are plant growth structures that can be used to extend the growing season or allow for use year around for growing high value specialty crops. This publication discusses the various attributes and applications of each so that plant producers in teaching, research, extension, commercially or as a hobby can determine the best structure to meet individual needs.
Cold frames, high tunnels, and greenhouses are structures that provide hobbyists and growers with options for plant protection and season extension. They vary in cost, size, structural complexity, and ability for year-round usage. The small cold frame …
Life History Of Paracoccus Marginatus (Hemiptera: Pseudococcidae) On Four Host Plant Species Under Laboratory Conditions, Kaushalya G. Amarasekare, Catharine M. Mannion, Lance S. Osborne, Nancy D. Epsky
Life History Of Paracoccus Marginatus (Hemiptera: Pseudococcidae) On Four Host Plant Species Under Laboratory Conditions, Kaushalya G. Amarasekare, Catharine M. Mannion, Lance S. Osborne, Nancy D. Epsky
Agricultural and Environmental Sciences Faculty Research
Life history of the mealybug, Paracoccus marginatus Williams and Granara de Willink, on three ornamental plants [Hibiscus rosa-sinensis L., Acalypha wilkesiana (Muell.-Arg.), and Plumeria rubra L.] and one weed species (Parthenium hysterophorus L.) was studied under laboratory conditions. Mealybugs were able to develop, survive, and reproduce on all four hosts; however, there were differences in the life history parameters. Adult females that developed on acalypha and parthenium emerged ≈1 d earlier than those that developed on hibiscus and plumeria. Adult males had a longer developmental time on plumeria than on the other hosts. Survival of first- and second-instar …
Using Stable Isotopes To Quantify Nitrogen Fates In Container Plants, Sam Raimann, Greg Michalski, Michael V. Mickelbart
Using Stable Isotopes To Quantify Nitrogen Fates In Container Plants, Sam Raimann, Greg Michalski, Michael V. Mickelbart
The Summer Undergraduate Research Fellowship (SURF) Symposium
Currently, in the agriculture field, it is not yet known the accurate amount of Nitrogen in fertilizer that plants take up. This statistic, known as the Nitrogen Use Efficiency is currently known to be within the 30-50% range (Lea-Cox and Ross, 2001). This is very important figure to know and it is a figure that can be improved, and therefore much time, energy, and resources can be saved. This research project will use concepts involving stable isotopes to examine red maple plant material and the soilless media that the plants were grown in. Three different isotope-labelled fertilizer treatments will be …
Arkansas Wheat Cultivar Performance Tests 2013-2014, R. E. Mason, R. G. Miller, J. P. Kelley, E. A. Milus
Arkansas Wheat Cultivar Performance Tests 2013-2014, R. E. Mason, R. G. Miller, J. P. Kelley, E. A. Milus
Arkansas Agricultural Experiment Station Research Series
Wheat cultivar performance tests are conducted each year in Arkansas by the Arkansas Agricultural Experiment Station, Department of Crop, Soil and Environmental Sciences. The tests provide information to companies developing cultivars and/or marketing seed within the state and aid the Arkansas Cooperative Extension Service in formulating cultivar recommendations for small-grain producers.
B. R. Wells Arkansas Rice Research Studies 2013, R. J. Norman, K.A. K. Moldenhauer
B. R. Wells Arkansas Rice Research Studies 2013, R. J. Norman, K.A. K. Moldenhauer
Arkansas Agricultural Experiment Station Research Series
No abstract provided.
Oh No! Something Is Eating My Coral Honeysuckle!, W. John Hayden
Oh No! Something Is Eating My Coral Honeysuckle!, W. John Hayden
Biology Faculty Publications
Let’s imagine a situation that could happen in your own backyard. Suppose you have a healthy specimen of 2014’s Virginia Native Plant Society Wildflower of the Year, coral honeysuckle (Lonicera sempervirens). Suppose further that this plant rewards you every spring with a flush of flashy red flowers that you treasure all the more because they consistently bring hummingbirds to your yard. Now imagine that one fine morning you notice some little green caterpillars voraciously eating the leaves of your beloved coral honeysuckle. What do you do?
Evaluation Of A Mycorrhizal-Like Fungus, Piriformospora Indica, On Floriculture Crops, Allison Justice
Evaluation Of A Mycorrhizal-Like Fungus, Piriformospora Indica, On Floriculture Crops, Allison Justice
All Dissertations
Piriformospora indica is a fungal endophyte, often called an arbuscular mycorrhizal-like fungus, that has been shown to provide benefits to plant symbionts by increasing nutrient uptake, biomass production, flower number, and disease resistance in a wide range of plant hosts. Research was carried out to investigate the ability of P. indica to improve plant production in floriculture crops. The first objective was to determine the optimal environmental conditions for growing P. indica in pure culture. Environmental conditions were optimized to produce the maximum chlamydospores for inoculum preparation (Chapter 1). These findings were used in the remaining chapters to prepare inocula …
Fall Seed Guide 2014, Teshome Regassa, P. Stephen Baenziger, Greg Kruger, Dipak Santra
Fall Seed Guide 2014, Teshome Regassa, P. Stephen Baenziger, Greg Kruger, Dipak Santra
Department of Agronomy and Horticulture: Faculty Publications
Crops include in this guide are winter wheat, winter barley, and triticale. You may receive this guide in the mail or through the University of Nebraska Extension network. The data and other information this guide is based on can be found at our web site: http://cropwatch.unl.edu/ varietytest/ and http://digitalcommons.unl.edu/ncia. Additional information is available at the wheat variety virtual tour web site http://cropwatch.unl.edu/wheat/virtual or the winter wheat variety selection tool page http://citnews.unl.edu/winter_wheat_tool/index.shtml.
Our rainfed plots in Keith County were lost to hail damage. Last season we had moist soil conditions at planting for the majority of the locations. There was good …
Summaries Of Arkansas Cotton Research 2013, Derrick M. Oosterhuis
Summaries Of Arkansas Cotton Research 2013, Derrick M. Oosterhuis
Arkansas Agricultural Experiment Station Research Series
No abstract provided.