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2014

Agriculture

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Articles 1501 - 1530 of 1557

Full-Text Articles in Life Sciences

The Role Of Futures Prices In Pricing Commodity Exports Of Developing Countries, Jorge Jose Handal Reyes Jan 2014

The Role Of Futures Prices In Pricing Commodity Exports Of Developing Countries, Jorge Jose Handal Reyes

LSU Master's Theses

The purpose of this thesis is to study the empirical linkages between nearby futures prices for coffee at the New York (NY) Intercontinental Exchange (ICE)/NY Board of Trade (NYBOT) and cash prices (producer and export prices) in selected Latin American countries. This theme was entertained in Fortenbery and Zapata (2004) and subsequently by Fortenbery and Zapata (2004) and Li and Fortenbery (2013). This thesis uses data from January 1990 to May 2013 and adds producer cash prices in addition to export prices, thus expanding the dataset by over a decade and adding local market cash prices relative to the ...


A Factor Analysis Of The Dimensions Of Economic Damages From Tropical Storms And Hurricanes In Louisiana, James Luke Boutwell Jan 2014

A Factor Analysis Of The Dimensions Of Economic Damages From Tropical Storms And Hurricanes In Louisiana, James Luke Boutwell

LSU Master's Theses

Coastal communities are highly sensitive to disturbances from tropical storms and hurricanes. This is particularly true in Louisiana and along the U.S. Gulf Coast where economies are largely dependent on tourism and natural resource based industry. Since Hurricane Katrina and, more recently, Hurricane Sandy, there has been an increase in concern for how coastal communities will mitigate and respond to the impacts of coastal storms. These concerns are made more acute by the increasing population concentrated along the coast and the risk of more frequent and more severe coastal storms in the future. A commonly advocated-for method of storm ...


Estimating U.S. Household Seafood Demand Based On Longitudinal And Cross-Sectional Data, Huabo Wang Jan 2014

Estimating U.S. Household Seafood Demand Based On Longitudinal And Cross-Sectional Data, Huabo Wang

LSU Doctoral Dissertations

This overall goal of this research is to examine and update U.S. at-home household demand estimates for seafood (including species and generic products) that can be used in policy formulation (by both the private and public sector). As such, this study estimated quantity-based household demand functions for seafood in aggregate, by generic product form (fresh, frozen, and prepared), and primary species. Given that the role of quality has been shown to significantly influence expenditures and seafood demand, this paper also seeks to incorporate the household quality choice into the demand model. In order to help to tailor the market ...


Analysis Of Media Coverage Of Selected Food Safety Events On The Demand For The Recalled Products, Abhishek Bhagwat Bharad Jan 2014

Analysis Of Media Coverage Of Selected Food Safety Events On The Demand For The Recalled Products, Abhishek Bhagwat Bharad

LSU Doctoral Dissertations

The major focus of this study was to identify the linkage between information and consumer behavior and to examine the role that a new media index played in the identifying the tone of news stories. Past studies have relied on using the number of media stories but, this study tests a new approach, i.e., in order to analyze the effect of information by incorporating the sentiment indices. These indices were created based on the tone of the news story. The results from sentiment indices were compared to the results from the information index. Barten’s Synthetic model (BSM) was ...


An Evaluation Of The Impact Of The Adoption Of The Onboard Module Building Cotton Harvest System On The Economic Competitiveness Of Cotton Production In Louisiana, Natalia Estefania Latorre Jan 2014

An Evaluation Of The Impact Of The Adoption Of The Onboard Module Building Cotton Harvest System On The Economic Competitiveness Of Cotton Production In Louisiana, Natalia Estefania Latorre

LSU Master's Theses

Planted acreage of cotton in Louisiana has decreased over the past several years due to higher cotton variable production costs, stagnant cotton market prices, and higher grain yields and market prices for corn and soybeans. The general objective was to determine the economic impact of the adoption and use of an onboard module building cotton harvest system on the ability of the cotton enterprise to compete for planted acreage in the mixed crop farming areas of Louisiana. Specific research objectives included the estimated of comparative ownership and operating costs for the module building harvest systems relative to existing basket/module ...


Remittance And Migration: Impact On Technology Adoption, Natural Resource Conservation, And Household Welfare, Deborah Ann Williams Jan 2014

Remittance And Migration: Impact On Technology Adoption, Natural Resource Conservation, And Household Welfare, Deborah Ann Williams

LSU Master's Theses

Nepal is the perfect country to study all the facets of migration, sustainable agriculture and their subsequent impact on food systems. Droves of migrants are leaving rural Nepal for higher incomes to cover household daily expenses. The Government of Nepal (GON) encourages migration as a means to reduce poverty, and remittance already amounts to 25.83% of GDP, and it is expected to grow (Nepal Bastra Bank 2014, Thieme and Wyss 2005, Yang 2011). However, it is still unclear whether the mass exodus from rural areas and the growing dependence on remittance, the portion of the migrant workers' earnings sent ...


Exchange Rate Volatility Effects On Brics Countries Exports, David Isaias Maradiaga Pineda Jan 2014

Exchange Rate Volatility Effects On Brics Countries Exports, David Isaias Maradiaga Pineda

LSU Doctoral Dissertations

The leaders of the leading emerging economies Brazil, Russia, India, China, and South Africa (BRICS) claim that increased currency exchange rate volatility (CERV) from USD, EUR, and JPY (G-3) negatively impacts their exports, and expressed their desire for less trade dependence on these currencies. The literature on the impact of CERV on trade is vast. However, no consensus on the impact’s direction and significance has been reached yet. The motivation of this study was: first, to contribute to the existing empirical literature by using an alternative methodology; and second, to provide empirical evidence to the claim’s validity or ...


Factors Influencing Adoption Of Vsh Queens In The Honey Breeding Industry, Julie Leiby Jan 2014

Factors Influencing Adoption Of Vsh Queens In The Honey Breeding Industry, Julie Leiby

LSU Master's Theses

There are many threats that contribute to the decline in honey bee colonies around the United States; among them is the Varroa mite, Varroa destructor. The Varroa mite is a significant threat to honey bees and, by extension, beekeepers across the United States. It is suspected to be one of the main contributors to the increase in colony collapse and the decline in bee numbers and the beekeeping industry (Danka, May 2013). Fifty-five percent of beekeepers exited beekeeping between 1987 and 2002 (USDA). Although honey production continued to decrease through 2007, the number of beekeepers entering beekeeping had increased (USDA ...


Nutrient Removal By Prairie Filter Strips In Agricultural Landscapes, Xiaobo Zhou, Matthew J. Helmers, Heidi Asbjornsen, Randall K. Kolka, Mark D. Tomer, Richard M. Cruse Jan 2014

Nutrient Removal By Prairie Filter Strips In Agricultural Landscapes, Xiaobo Zhou, Matthew J. Helmers, Heidi Asbjornsen, Randall K. Kolka, Mark D. Tomer, Richard M. Cruse

Agricultural and Biosystems Engineering Publications

Nitrogen (N) and phosphorus (P) from agricultural landscapes have been identified as primary sources of excess nutrients in aquatic systems. The main objective of this study was to evaluate the effectiveness of prairie filter strips (PFS) in removing nutrients from cropland runoff in 12 small watersheds in central Iowa. Four treatments with PFS of different spatial coverage and distribution (No-PFS, 10% PFS, 10% PFS with strips, and 20% PFS with strips) were arranged in a balanced incomplete block design across four blocks in 2007. A no-tillage two-year corn (Zea mays L.) –soybean (Glycine max [L.] Merr.) rotation was grown in ...


Ammonia And Greenhouse Gas Emissions From Biogas Digester Effluent Stored At Different Depths, Yue Wang, Hongmin Dong, Zhiping Zhu, Tong Li, Kai Mei, Hongwei Xin Jan 2014

Ammonia And Greenhouse Gas Emissions From Biogas Digester Effluent Stored At Different Depths, Yue Wang, Hongmin Dong, Zhiping Zhu, Tong Li, Kai Mei, Hongwei Xin

Agricultural and Biosystems Engineering Publications

Carbonaceous and nitrogenous gases are produced during storage of livestock manure, with the magnitude of production being affected by the chemical properties of the manure and the physical conditions of storage. This lab-scale study quantifies the emission rates of ammonia (NH3), nitric oxide (NO), and greenhouse gases (GHG), i.e., methane (CH4), carbon dioxide (CO2), nitrous oxide (N2O), from biogas digester effluent (BDE) stored at different depths of 1.0, 1.5, and 2.0 m in dynamic emission vessels (DEVs). The selected storage depths were reflective of the typical depth range of on-farm BDE storage in China. The static ...


Automated Tracking And Behavior Quantification Of Laying Hens Using 3d Computer Vision And Radio Frequency Identification Technologies, Akash D. Nakarmi, Lie Tang, Hongwei Xin Jan 2014

Automated Tracking And Behavior Quantification Of Laying Hens Using 3d Computer Vision And Radio Frequency Identification Technologies, Akash D. Nakarmi, Lie Tang, Hongwei Xin

Agricultural and Biosystems Engineering Publications

Housing design and management schemes (e.g., bird stocking density) in egg production can impact hens’ ability to perform natural behaviors and production economic efficiency. It is therefore of socio-economic importance to quantify the effects of such schemes on laying-hen behaviors, which may in turn have implications on the animals’ well-being. Video recording and manual video analysis is the most common approach used to track and register laying-hen behaviors. However, such manual video analyses are labor intensive and are prone to human error, and the number of target objects that can be tracked simultaneously is small. In this study, we ...


Assessing Linkages Between E. Coli Levels In Streambed Sediment And Overlying Water In An Agricultural Watershed In Iowa During The First Heavy Rain Event Of The Season, Pramod K. Pandey, Michelle L. Soupir Jan 2014

Assessing Linkages Between E. Coli Levels In Streambed Sediment And Overlying Water In An Agricultural Watershed In Iowa During The First Heavy Rain Event Of The Season, Pramod K. Pandey, Michelle L. Soupir

Agricultural and Biosystems Engineering Publications

This study involved field observations in Squaw Creek watershed, located in central Iowa, to investigate the impact of a heavy rain event (rainfall of 71 mm in 24 h) on E. coli levels in the streambed sediment and overlying water. We assessed relationships between streamflow and E. coli and nutrient levels in the water column and streambed sediment. The results showed that during a heavy rain event, E. coli levels in the water column varied considerably, ranging from 360 to 37,553 CFU per 100 mL with a mean of 7,598 CFU per 100 mL. Elevated streamflow resulted in ...


Estimation Of Ammonia Emission From Manure Belt Poultry Layer Houses Using An Alternative Mass Balance Method, Shunli Wang, Lingying Zhao, Xinying Wang, Roderick Manuzon, Matthew J. Darr, Hui Li, Harold M. Keener Jan 2014

Estimation Of Ammonia Emission From Manure Belt Poultry Layer Houses Using An Alternative Mass Balance Method, Shunli Wang, Lingying Zhao, Xinying Wang, Roderick Manuzon, Matthew J. Darr, Hui Li, Harold M. Keener

Agricultural and Biosystems Engineering Publications

Ammonia (NH3) emissions from poultry animal feeding operations (AFOs) have caused health and environmental concerns. Current NH3 emission measurement methods are accurate and reliable but also time-consuming, expensive, and impractical for most animal facilities. In this study, an alternative mass balance method was developed to effectively predict NH3 emissions from manure belt (MB) poultry layer facilities. This method can eliminate the need for tracking manure flow rates in traditional mass balance analyses for estimation of ammonia nitrogen (NH3-N) emissions. It was applied to three MB layer poultry houses in Ohio, with approximately 160,000 hens ...


Transforming Organic Waste Into A Marketable Product: A Conjoint Analysis Of Bulk Compost Preferences And Strategies For Expanding The Compost Market In Vermont, Daniel Colin Keeney Jan 2014

Transforming Organic Waste Into A Marketable Product: A Conjoint Analysis Of Bulk Compost Preferences And Strategies For Expanding The Compost Market In Vermont, Daniel Colin Keeney

Graduate College Dissertations and Theses

Organic waste management presents challenges and opportunities alike for community-based economic development. Waste-to-compost transformation can be socially and economically successful by employing ecological design principles, multi-stakeholder collaboration, and values-based supply chains (VCs). An analysis of commercial buyers' preferences for compost will inform approaches to forming effective partnerships of public, private and nonprofit stakeholders to develop a market for local waste resource products. The thesis summarizes the results of a consumer preferences survey of current and prospective bulk compost purchasers and discusses strategies for implementing new organic waste management policies that will strengthen a local market for compost, build social capital ...


Fate Of Antimicrobials And Antimicrobial Resistance Genes In Simulated Swine Manure Storage, Stacey R. Joy, Xu Li, Daniel D. Snow, John Gilley, Bryan L. Woodbury, Shannon L. Bartelt-Hunt Jan 2014

Fate Of Antimicrobials And Antimicrobial Resistance Genes In Simulated Swine Manure Storage, Stacey R. Joy, Xu Li, Daniel D. Snow, John Gilley, Bryan L. Woodbury, Shannon L. Bartelt-Hunt

Papers in Natural Resources

The behavior of three antibiotics (bacitracin, chlortetracycline, and tylosin) and two classes of antibiotic resistance genes (ARGs), tet and erm, were monitored in swine manure slurry under anaerobic conditions. First-order decay rates were determined for each antibiotic with half-lives ranging from1 day (chlortetracycline) to 10 days (tylosin). ARGs were monitored in the swine manure slurry, and losses of approximately 1 to 3 orders of magnitude in relative abundance were observed during the 40 day storage period. First-order degradation profiles were observed for chlortetracycline and its corresponding resistance genes, tet(X) and tet(Q). Tylosin was degraded to approximately 10% of ...


Letter From The Dean, Michael Vayda Jan 2014

Letter From The Dean, Michael Vayda

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.


Encouraging Teacher Change Within The Realities Of School-Based Agricultural Education: Lessons From Teachers’ Initial Use Of Socioscientific Issues-Based Instruction, Amie Wilcox, Catherine W. Shoulders, Brian E. Myers Jan 2014

Encouraging Teacher Change Within The Realities Of School-Based Agricultural Education: Lessons From Teachers’ Initial Use Of Socioscientific Issues-Based Instruction, Amie Wilcox, Catherine W. Shoulders, Brian E. Myers

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

Calls for increased interdisciplinary education have led to the development of numerous teaching techniques designed to help teachers provide meaningful experiences for their students. However, methods of guiding teachers in the successful adoption of innovative teaching approaches are not firmly set. This qualitative study sought to better understand how school-based agricultural education teachers decide to adopt or discontinue a teaching innovation when introduced through ready-made lesson plans, which is currently a common practice of teaching method integration in school-based agricultural education (SBAE). Constant comparative analysis unveiled themes within the reactions to the teaching method’s use, as well as how ...


Nucleotide Polymorphism And Copy Number Variant Detection Using Exome Capture And Next-Generation Sequencing In The Polyploid Grass Panicum Virgatum, Joseph Evans, Jeongwoon Kim, Kevin L. Childs, Briaenne Vaillancourt, Emily Crisovan, Aruna Nandety, Daniel J. Gerhardt, Todd A. Richmond, Jeffery A. Jeddeloh, Shawn M. Kaeppler, Michael D. Casler, C Robin Buell Jan 2014

Nucleotide Polymorphism And Copy Number Variant Detection Using Exome Capture And Next-Generation Sequencing In The Polyploid Grass Panicum Virgatum, Joseph Evans, Jeongwoon Kim, Kevin L. Childs, Briaenne Vaillancourt, Emily Crisovan, Aruna Nandety, Daniel J. Gerhardt, Todd A. Richmond, Jeffery A. Jeddeloh, Shawn M. Kaeppler, Michael D. Casler, C Robin Buell

Publications from USDA-ARS / UNL Faculty

Switchgrass (Panicum virgatum) is a polyploid, outcrossing grass species native to North America and has recently been recognized as a potential biofuel feedstock crop. Significant phenotypic variation including ploidy is present across the two primary ecotypes of switchgrass, referred to as upland and lowland switchgrass. The tetraploid switchgrass genome is approximately 1400 Mbp, split between two subgenomes, with significant repetitive sequence content limiting the efficiency of re-sequencing approaches for determining genome diversity. To characterize genetic diversity in upland and lowland switchgrass as a first step in linking genotype to phenotype, we designed an exome capture probe set based on transcript ...


Just Farming: An Environmental Justice Perspective On The Capacity Of Grassroots Organizations To Support The Rights Of Organic Farmers And Laborers, Rebecca Elaine Berkey Jan 2014

Just Farming: An Environmental Justice Perspective On The Capacity Of Grassroots Organizations To Support The Rights Of Organic Farmers And Laborers, Rebecca Elaine Berkey

Dissertations & Theses

This mixed methods study builds upon literature and research in environmental justice, public participation, and community development to examine how justice-related issues impact farmers and workers on organic farms in the Northeastern United States. It also examines how involvement in a grassroots organization helps farmers and workers address these issues. At the core of the study is an exploration of environmental justice and its applications at a broad, systemic level; an examination of the current context of laborers in organic agriculture in the Northeast; and finally an investigation of the effects of grassroots organizing within the Northeast Organic Farming Association ...


Transcriptional Analysis Of The Global Regulatory Networks Active In Pseudomonas Syringae During Leaf Colonization, Xilan Yu, Steven P. Lund, Jessica W. Greenwald, Angela H. Records, Russell A. Scott, Dan Nettleton, Steven E. Lindow, Dennis C. Gross, Gwyn A. Beattie Jan 2014

Transcriptional Analysis Of The Global Regulatory Networks Active In Pseudomonas Syringae During Leaf Colonization, Xilan Yu, Steven P. Lund, Jessica W. Greenwald, Angela H. Records, Russell A. Scott, Dan Nettleton, Steven E. Lindow, Dennis C. Gross, Gwyn A. Beattie

Plant Pathology and Microbiology Publications

The plant pathogen Pseudomonas syringae pv. syringae B728a grows and survives on leaf surfaces and in the leaf apoplast of its host, bean (Phaseolus vulgaris). To understand the contribution of distinct regulators to B728a fitness and pathogenicity, we performed a transcriptome analysis of strain B728a and nine regulatory mutants recovered from the surfaces and interior of leaves and exposed to environmental stresses in culture. The quorum-sensing regulators AhlR and AefR influenced few genes in planta or in vitro. In contrast, GacS and a downstream regulator, SalA, formed a large regulatory network that included a branch that regulated diverse traits and ...


Distribution Of The Soybean Cyst Nematode, Heterodera Glycines, In The United States And Canada: 1954 To 2014, Gregory L. Tylka, Christopher C. Marett Jan 2014

Distribution Of The Soybean Cyst Nematode, Heterodera Glycines, In The United States And Canada: 1954 To 2014, Gregory L. Tylka, Christopher C. Marett

Plant Pathology and Microbiology Publications

The soybean cyst nematode, Heterodera glycines Ichinohe, is considered the most damaging pathogen of soybean (Glycine max (L.) Merr.) in the United States and Canada (6). This nematode also causes considerable yield loss in many other soybeanproducing countries in the world. Heterodera glycines was first discovered in the United States in New Hanover County, North Carolina in 1954 (5) and is believed to have been introduced from Asia (3). In 1987, the nematode was discovered in Kent County, Ontario (1). At various times since these initial discoveries, maps were created of the counties in the United States and Canada that ...


Identification Of Candidate Genes Involved In Early Iron Deficiency Chlorosis Signaling In Soybean (Glycine Max) Roots And Leaves, Adrienne N. Moran-Lauter, Gregory Allan Peiffer, Tengfei Yin, Steven A. Whitham, Dianne Cook, Randy Shoemaker, Michelle Graham Jan 2014

Identification Of Candidate Genes Involved In Early Iron Deficiency Chlorosis Signaling In Soybean (Glycine Max) Roots And Leaves, Adrienne N. Moran-Lauter, Gregory Allan Peiffer, Tengfei Yin, Steven A. Whitham, Dianne Cook, Randy Shoemaker, Michelle Graham

Plant Pathology and Microbiology Publications

Background

Iron is an essential micronutrient for all living things, required in plants for photosynthesis, respiration and metabolism. A lack of bioavailable iron in soil leads to iron deficiency chlorosis (IDC), causing a reduction in photosynthesis and interveinal yellowing of leaves. Soybeans (Glycine max (L.) Merr.) grown in high pH soils often suffer from IDC, resulting in substantial yield losses. Iron efficient soybean cultivars maintain photosynthesis and have higher yields under IDC-promoting conditions than inefficient cultivars.

Results

To capture signaling between roots and leaves and identify genes acting early in the iron efficient cultivar Clark, we conducted a RNA-Seq study ...


Fumonisins In Conventional And Transgenic, Insect-Resistant Maize Intended For Fuel Ethanol Production: Implications For Fermentation Efficiency And Ddgs Co-Product Quality, Erin Louise Bowers, Gary P. Munkvold Jan 2014

Fumonisins In Conventional And Transgenic, Insect-Resistant Maize Intended For Fuel Ethanol Production: Implications For Fermentation Efficiency And Ddgs Co-Product Quality, Erin Louise Bowers, Gary P. Munkvold

Plant Pathology and Microbiology Publications

Mycotoxins in maize grain intended for ethanol production are enriched in co-product dried distiller’s grains and solubles (DDGS) and may be detrimental to yeast in fermentation. This study was conducted to examine the magnitude of fumonisin enrichment in DDGS and to analyze the impacts of insect injury, Fusarium ear rot severity, and fumonisin contamination on final ethanol yield. Samples of naturally-contaminated grain (0 to 35 mg/kg fumonisins) from field trials conducted in 2008–2011 were fermented and DDGS collected and analyzed for fumonisin content. Ethanol yield (determined gravimetrically) was unaffected by fumonisins in the range occurring in this ...


Replication Protein A Subunit 3 And The Iron Efficiency Response In Soybean, Sarah Atwood, Jamie A. O'Rourke, Tengfei Yin, Mahbubul Majumder, Chunquan Zhang, Sylvia R. Cianzio, John H. Hill, Dianne Cook, Steven A. Whitham, Randy Shoemaker, Michelle Graham Jan 2014

Replication Protein A Subunit 3 And The Iron Efficiency Response In Soybean, Sarah Atwood, Jamie A. O'Rourke, Tengfei Yin, Mahbubul Majumder, Chunquan Zhang, Sylvia R. Cianzio, John H. Hill, Dianne Cook, Steven A. Whitham, Randy Shoemaker, Michelle Graham

Plant Pathology and Microbiology Publications

In soybean [Glycine max (L.) Merr.], iron deficiency results in interveinal chlorosis and decreased photosynthetic capacity, leading to stunting and yield loss. In this study,gene expression analyses investigated the role of soybean replication proteinA (RPA) subunits during iron stress. Nine RPA homologs were significantly differentially expressed in response to iron stress in the near isogenic lines (NILs) Clark (iron efficient) and Isoclark (iron inefficient).RPAhomologs exhibited opposing expression patterns in the two NILs, with RPA expression significantly repressed during iron deficiency in Clark but induced in Isoclark. We used virus induced gene silencing (VIGS) to repress GmRPA3 expression in ...


Nebraska’S Groundwater Legacy: Nitrate Contamination Beneath Irrigated Cropland, Mary E. Exner Spaulding, Aaron J. Hirsh, Roy F. Spalding Jan 2014

Nebraska’S Groundwater Legacy: Nitrate Contamination Beneath Irrigated Cropland, Mary E. Exner Spaulding, Aaron J. Hirsh, Roy F. Spalding

Agronomy & Horticulture -- Faculty Publications

A 31 year record of ~44,000 nitrate analyses in ~11,500 irrigation wells was utilized to depict the decadal expansion of groundwater nitrate contamination (N>10 mg/L) in the irrigated corn-growing areas of eastern and central Nebraska and analyze long-term nitrate concentration trends in 17 management areas (MAs) subject to N fertilizer and budgeting requirements. The 1.3 M contaminated hectares were characterized by irrigation method, soil drainage, and vadose zone thickness and lithology. The areal extent and growth of contaminated groundwater in two predominately sprinkler-irrigated areas was only ~20% smaller beneath well-drained silt loams with thick clayey-silt ...


The Interaction Of Climate Change, Land Cover, And Political Representation In The Usa, Brady W. Allred, Dirac L. Twidwell, Samuel D. Fuhlendorf Jan 2014

The Interaction Of Climate Change, Land Cover, And Political Representation In The Usa, Brady W. Allred, Dirac L. Twidwell, Samuel D. Fuhlendorf

Agronomy & Horticulture -- Faculty Publications

The difficulties in tackling climate change are inherently complex and primarily centered on political and social values. This is evident in the United States where political divisions and polarizations are fundamental barriers to advancing national policies, which in turn hinder international agreements, mitigation, and adaptation. Within the United States, the vast majority of agricultural and natural resource lands are projected to incur significant climate departures and are represented by the Republican Party. The resources and economic sectors that will be directly affected by climate change are represented by national leadership that is unlikely to accept policies to prevent or adapt ...


Porocercospora Seminalis Gen. Et Comb. Nov., The Causal Organism Of Buffalograss False Smut, Bimal S. Amaradasa, Hugo Madrid, Johannes Z. Groenewald, Pedro W. Crous, Keenan L. Amundsen Jan 2014

Porocercospora Seminalis Gen. Et Comb. Nov., The Causal Organism Of Buffalograss False Smut, Bimal S. Amaradasa, Hugo Madrid, Johannes Z. Groenewald, Pedro W. Crous, Keenan L. Amundsen

Agronomy & Horticulture -- Faculty Publications

False smut caused by Cercospora seminalis is an important disease of buffalograss (Buchloe dactyloides) affecting seed production. The pathogen prevents normal caryopsis development and causes considerable yield loss and reduced seed germination. The current taxonomic placement of the false-smut causal pathogen in the genus Cercospora is incorrect based on its morphological characteristics and DNA phylogeny. In the present study the phylogenetic position of C. seminalis is clarified based on DNA sequence analysis of three loci namely the internal transcribed spacer (ITS) region, partial nuclear ribosomal large subunit (LSU) and partial sequences of the RNA polymerase II second largest subunit (RPB2 ...


Drought Effects On Composition And Yield For Corn Stover, Mixed Grasses, And Miscanthus As Bioenergy Feedstocks, Rachel Emerson, Amber Hoover, Allison Ray, Jeffrey Lacey, Marnie Cortez, Courtney Payne, Douglas L. Karlen, Stuart Birrell, David Laird, Robert Kallenbach, Josh Egenolf, Matthew Sousek, Thomas Voigt Jan 2014

Drought Effects On Composition And Yield For Corn Stover, Mixed Grasses, And Miscanthus As Bioenergy Feedstocks, Rachel Emerson, Amber Hoover, Allison Ray, Jeffrey Lacey, Marnie Cortez, Courtney Payne, Douglas L. Karlen, Stuart Birrell, David Laird, Robert Kallenbach, Josh Egenolf, Matthew Sousek, Thomas Voigt

Agronomy & Horticulture -- Faculty Publications

Drought conditions in 2012 were some of the most severe in recent history. The purpose of this study is to examine the impact of drought on quality, quantity, and theoretical ethanol yield (TEY) of three bioenergy feedstocks, corn stover, mixed grasses from Conservation Reserve Program lands, and Miscanthus × giganteus. To assess drought effects on these feedstocks, samples from 2010 (minimal to no drought) and 2012 (severe drought) were compared from multiple locations in the US. In all feedstocks, drought significantly increased extractives and reduced structural sugars and lignin; subsequently, TEYs were reduced 10–15%. Biomass yields were significantly reduced for ...


Arabidopsis Lipins, Pdat1 Acyltransferase, And Sdp1 Triacylglycerol Lipase Synergistically Direct Fatty Acids Toward Β-Oxidation, Thereby Maintaining Membrane Lipid Homeostasis, Jilian Fan, Chengshi Yan, Rebecca Roston, John Shanklin, Changcheng Xu Jan 2014

Arabidopsis Lipins, Pdat1 Acyltransferase, And Sdp1 Triacylglycerol Lipase Synergistically Direct Fatty Acids Toward Β-Oxidation, Thereby Maintaining Membrane Lipid Homeostasis, Jilian Fan, Chengshi Yan, Rebecca Roston, John Shanklin, Changcheng Xu

Agronomy & Horticulture -- Faculty Publications

Triacylglycerol (TAG) metabolism is a key aspect of intracellular lipid homeostasis in yeast and mammals, but its role in vegetative tissues of plants remains poorly defined. We previously reported that PHOSPHOLIPID:DIACYLGLYCEROL ACYLTRANSFERASE1 (PDAT1) is crucial for diverting fatty acids (FAs) from membrane lipid synthesis to TAG and thereby protecting against FA-induced cell death in leaves. Here, we show that overexpression of PDAT1 enhances the turnover of FAs in leaf lipids. Using the trigalactosyldiacylglycerol1-1 (tgd1-1) mutant, which displays substantially enhanced PDAT1- mediated TAG synthesis, we demonstrate that disruption of SUGAR-DEPENDENT1 (SDP1) TAG lipase or PEROXISOMAL TRANSPORTER1 (PXA1) severely decreases FA ...


Eqtl Networks Reveal Complex Genetic Architecture In The Immature Soybean Seed, Yung-Tsi Bolon, D. Hyten, James H. Orf, Carroll P. Vance, Gary J. Muehlbauer Jan 2014

Eqtl Networks Reveal Complex Genetic Architecture In The Immature Soybean Seed, Yung-Tsi Bolon, D. Hyten, James H. Orf, Carroll P. Vance, Gary J. Muehlbauer

Agronomy & Horticulture -- Faculty Publications

The complex network of regulatory factors and interactions involved in transcriptional regulation within the seed is not well understood. To evaluate gene expression regulation in the immature seed, we utilized a genetical genomics approach on a soybean [Glycine max (L.) Merr.] recombinant inbred line (RIL) population and produced a genome-wide expression quantitative trait loci (eQTL) dataset. The validity of the dataset was confirmed by mapping the eQTL hotspot for flavonoid biosynthesis-related genes to a region containing repeats of chalcone synthase (CHS) genes known to correspond to the soybean inhibitor locus that regulates seed color. We then identified eQTL for genes ...