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Theses/Dissertations

1995

Plant Sciences

Articles 1 - 30 of 67

Full-Text Articles in Life Sciences

Incidence And Life History Of Beech Scale, Initiator Of Beech Bark Disease, In The Great Smoky Mountains National Park, Robert Angelo Vance Dec 1995

Incidence And Life History Of Beech Scale, Initiator Of Beech Bark Disease, In The Great Smoky Mountains National Park, Robert Angelo Vance

Masters Theses

American beech, Fagus grandifolia Ehrlich, in eastern North America are currently threatened by the devastating beech bark disease. This disease is caused by the fungal pathogens, Nectria coccinea var. faginata Lohman, Watson and Ayers, and Nectria galligena Bres., which infect trees that are predisposed by infestations of beech scale, Cryptococcus fagisuga Lindinger. In 1993, beech bark disease was discovered in the Great Smoky Mountains National Park (GSMNP).

In 1994, a 2-year cooperative research project involving the National Park Service and the University of Tennessee Agricultural Experiment Station was initiated to study several aspects of beech bark disease in the GSMNP ...


Effects Of Non-Point Nutrient Loading On Planktonic Community Structure And Function In A Great Lakes Coastal Wetland, Brian M. Binion Jul 1995

Effects Of Non-Point Nutrient Loading On Planktonic Community Structure And Function In A Great Lakes Coastal Wetland, Brian M. Binion

Morehead State Theses and Dissertations

A thesis presented to the faculty of the College of Science and Technology at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Biology by Brian M. Binion on July 26, 1995.


The Feasibility Of Trophic Manipulation In Grayson Lake, Kentucky, U.S.A., Russell Walker Crawford Jul 1995

The Feasibility Of Trophic Manipulation In Grayson Lake, Kentucky, U.S.A., Russell Walker Crawford

Morehead State Theses and Dissertations

A thesis presented to the faculty of the College of Science and Technology at Morehead State University in partial fulfillment of the requirements for the Degree of Masters of Science by Russell Walker Crawford on July 19, 1995.


Demography, Reproduction, Diet And Crop Depredation In Three Species Of Rodents In Natural And Irrigated Fields In Nigeria, Safianu Rabiu Jul 1995

Demography, Reproduction, Diet And Crop Depredation In Three Species Of Rodents In Natural And Irrigated Fields In Nigeria, Safianu Rabiu

Biological Sciences Theses & Dissertations

Rodent populations of Arvicanthis, Mastomys and Tatera were studied during July 1990 to August 1992 in both natural and irrigated savannah fields of northern Nigeria. Tatera was entirely absent from the irrigated fields. Irrigation enhanced higher rodent population densities in the magnitude of three to four times over densities in the natural field. Arvicanthis was the most abundant of the three species in both sites. Tatera was the least common in the natural site. Adult survival rates in Arvicanthis and Tatera were significantly higher than Mastomys. Survival rates of both adult and young differed between the wet and dry seasons ...


Transitions In Masculinity And Hemingway's Developed "Code", Daniel Polk May 1995

Transitions In Masculinity And Hemingway's Developed "Code", Daniel Polk

Honors Theses

The "Hemingway Code" is much more than two words that fit nicely together for a scholar's usage; the words signify a much deeper championing of masculinity, almost a haunting presence. For Ernest Hemingway living life every day, every moment with its fullest masculine fervor, became an obsession, a never-ending quest to be at one with the attitude of never complaining, never crying out, panicking, thinking too much, or regretting. To live a manly life in a series of tactical victories, performed with steadfast ritualistic mannerisms, is to embody masculinity, and therefore the "Hemingway Code."


Identification Of Dna Markers In Triticum Aestivum-Aegilops Caudata Additions Lines By Randomly Amplified Polymorphic Dna (Rapd) Technology, Ling Wei May 1995

Identification Of Dna Markers In Triticum Aestivum-Aegilops Caudata Additions Lines By Randomly Amplified Polymorphic Dna (Rapd) Technology, Ling Wei

All Graduate Theses and Dissertations

The objective of this study was to identify DNA markers for each of six added C-genome chromosomes in Triticum aestivum L. cv. 'Alceso'-Aegilops caudata L. addition lines using the randomly amplified polymorphic DNA (RAPD) technique. DNA from Ae. caudata, T. aestivum, amphiploid of T. aestivum X Ae. caudata, and six disomic addition lines of wheat having a pair of Ae. caudata chromosomes was used as the template for the amplification of RAPD markers with a total of 58 random 10-mer oligonucleotide primers. Two primers, OPC-08 and OPJ-16, produced one intense band each from the amphiploid of T. aestivum X ...


Using Gis To Analyze The Precipitation Regime Of The Great Smoky Mountains National Park, Tn/Nc, Thomas Bryan Coffey May 1995

Using Gis To Analyze The Precipitation Regime Of The Great Smoky Mountains National Park, Tn/Nc, Thomas Bryan Coffey

Masters Theses

Studies or research conducted in remote areas of the Great Smoky Mountains National Park (GSMNP) involving the use of precipitation data, have often resolved to utilizing the precipitation data from weather stations located in more easily accessible areas or from nearby towns and cities. This study was conducted to determine an accurate annual average precipitation value for the GSMNP and to develop an average annual precipitation database (coverage) for the park as a whole. Precipitation data from 51 weather stations in and around the GSMNP were placed into the geographic information system (GIS), ARC/INFO, and three methods were implemented ...


Membrane Protein As A Basis Of Nacl Tolerance In Alfalfa, Husni N. Sabah May 1995

Membrane Protein As A Basis Of Nacl Tolerance In Alfalfa, Husni N. Sabah

All Graduate Theses and Dissertations

This study sought to determine whether NaCl altered the plasma membrane proteins in alfalfa exhibiting differential NaCl concentrations, and whether caso4 modified the responses. Two alfalfa cultivars, Centurion and Condor, were grown in 0.5 strength Hoagland solution in a greenhouse. The cultivars were exposed to 0, 88, and 132 mM of NaCl alone and mixed with caso4 .H20 at 7 and 14 Mm caso4 for 3, 9, and 60 days.

In experiment 1, roots were dried to determine their Na, Ca, K, and Mg concentration. The results were similar to previous reports in which CaS04 alleviated the salt stress ...


Competitive Interactions Between Two Closely Related Rhizomatous And Caespitose Perennial Grasses Under Varying Conditions, L. David Humphrey May 1995

Competitive Interactions Between Two Closely Related Rhizomatous And Caespitose Perennial Grasses Under Varying Conditions, L. David Humphrey

All Graduate Theses and Dissertations

Biomass, tiller numbers, flowering, and genet survival were accessed for the rhizomatous Elymus lanceolatus ssp. lanceolatus and caespitose E. l. ssp. wawawaiensis growing in mixtures with a range of densities of each taxon. Models of aboveground biomass of each taxon as a function of mixed densities were used to calculate competition indices. Tiller numbers and biomass of ssp. lanceolatus were higher than those of the caespitose taxon in the first year, but declined in the second year, while biomass and tiller numbers of ssp. wawawaiensis changed little. All tillers of ssp. wawawaiensis emerged in autumn; tillers of ssp. lanceolatus emerged ...


Winter Habitat Selection By American Marten (Martes Americana) In Newfoundland: Why Old Growth?, Gary S. Drew May 1995

Winter Habitat Selection By American Marten (Martes Americana) In Newfoundland: Why Old Growth?, Gary S. Drew

All Graduate Theses and Dissertations

Although the American marten (Martes americana) generally is recognized as an obligate late-seral species, the factors dictating this association are poorly understood. Martens were studied in Newfoundland, Yellowstone National Park, and in a captive setting. As expected, use of habitat types was not proportional to availability P < 0.001). Defoliated and late-seral conifer stands were used more than expected, while all other types indicated expected or less than expected use. Habitat selection by martens was detectable at spatial scales greater than 80 m (P < 0.001).

Newfoundland martens were radio-collared and monitored for diet activity during the winters of 1990 and 1991. A regression of the percent active fixes on temperature had a negative slope (P = -4.45, P= 0.084, n = 12), indicating that martens did not minimize their exposure to low temperatures. A log-linear model suggested that ...


Cytological And Molecular Analyses Of The Ns Genome In Russian Wildrye, Psathyrostachys Juincea (Fisch.), Junzhi Wei May 1995

Cytological And Molecular Analyses Of The Ns Genome In Russian Wildrye, Psathyrostachys Juincea (Fisch.), Junzhi Wei

All Graduate Theses and Dissertations

Russian wildrye (Psathyrostachys juncea Fisch. 2n=2x=14, NsNs) is an important forage grass and a potentially useful germplasm in wheat improvement. A standard C-banding karyotype of Ps. juncea has been developed based on the C-bands of chromosomes in geographically diverse materials. Although there are C-banding polymorph isms, the seven pairs of chromosomes can be distinguished from each other according to their basic banding patterns. Based on C-banded karyotype, one deletion-t ranslocation heterozygote, four primary trisomies, one double-deletion trisomic, and two tertiary trisomies were identified. These cytogenetic stocks will be useful in genetic studies of Russian wildrye.

Genetic variations in ...


Ecological Phenomena And Their Effect On The Flora Of Makoshika State Park, Richard Wheeler Apr 1995

Ecological Phenomena And Their Effect On The Flora Of Makoshika State Park, Richard Wheeler

Life and Environmental Sciences Undergraduate Theses

An inventory of the Makoshika State Park flora was compiled. Approximately 200 plant species were collected and pressed; 160 have been identified. Distinct communities were defined by soil type, moisture requirements, and degree of human intervention. The ecological affects the environment exerts on vegetaton and the vegetations alterations of the environment were considered. The study reveals that the harsh habitat of Makoshika State Park supports diverse plant populations.


Protein-Binding Sequences That May Regulate Organ-Preferential Transcription Of Zrp2, A Zea Mays Root-Preferential Gene, Therese Shamala Tirimanne Jan 1995

Protein-Binding Sequences That May Regulate Organ-Preferential Transcription Of Zrp2, A Zea Mays Root-Preferential Gene, Therese Shamala Tirimanne

Retrospective Theses and Dissertations

In this study, DNA-protein interactions of the first kilobase region proximal to the transcription start site of the zrp2 (Zea mays root-preferential 2) gene promoter was analyzed. The intent of this research was to identify regions of the promoter and DNA-protein interactions, that are responsible for root-preferential transcription. In vitro run-on transcription assays had revealed dramatically higher levels of transcription in 3-d-old roots than in 5-d-old leaves (Held, 1993). Interactions between regions of the zrp2 promoter and nuclear protein extracts from 3-d-old roots and 5-d-old leaves of maize were analyzed by gel mobility-shift assays. Two DNA-protein complexes with each protein ...


Effects Of Ear Developmental Temperature On Fine Structure Of Maize Starch , Ting-Jang Lu Jan 1995

Effects Of Ear Developmental Temperature On Fine Structure Of Maize Starch , Ting-Jang Lu

Retrospective Theses and Dissertations

Two genetically unrelated normal dent maize inbreds, ICI63 and ICI92, with different heterotic backgrounds were used for studying environmental temperature effects on grain yield and quality. These two maize inbreds are used in commercially available hybrids and are proprietary to ICI Seeds. The maize inbreds were grown in a greenhouse to control the growing condition of the plants. After 14 days post-pollination, the ears were wrapped in temperature control devices set at 25 or 35∘ C during the grain-filling period. Grain yield, kernel weight, and kernel density were less for ears developing at 35∘ C than for those at 25 ...


Molecular Basis Of Resistance To Soybean Mosaic Virus: Reverse Transcription (Rt)-Pcr And Strain Complementation Analysis In Soybeans , Michael E. Omunyin Jan 1995

Molecular Basis Of Resistance To Soybean Mosaic Virus: Reverse Transcription (Rt)-Pcr And Strain Complementation Analysis In Soybeans , Michael E. Omunyin

Retrospective Theses and Dissertations

Soybean (Glycine max(L.) Merr.) is grown in both developed and developing countries primarily for vegetable oil and protein products. It is the third most widely planted crop in the United States. Soybean mosaic virus (SMV) can affect soybean production by causing reduction in grain yield and quality. The virus is a member of the large and economically important family Potyviridae and several strains have been identified. Soybean lines exist that contain single genes (Rsv) for resistance to SMV. Therefore, SMV and soybean have been used as a model to understand plant resistance to virus disease. One facet of this ...


Effects Of Shallow Water Tables On Soil Aeration, Water Quality, And Physiological Growth Of Soybean , Tahir Sarwar Jan 1995

Effects Of Shallow Water Tables On Soil Aeration, Water Quality, And Physiological Growth Of Soybean , Tahir Sarwar

Retrospective Theses and Dissertations

This study was conducted to investigate the effects shallow water table depths on soil aeration, groundwater quality and on some physiological growth and yield parameters of soybean. The experiments were conducted in two environmentally controlled growth chambers using sixteen lysimeters. Water table (WT) treatments were established on 37 day after planting (DAP), at depths of 0.15-, 0.30-, 0.45- and 0.60-m below the soil surface. Soil aeration status was determined by measuring soil oxygen concentrations at 0.15-, 0.30-, 0.60-m depths in the lysimeters. Effects of water table depths on groundwater quality were determined by ...


Spectral Hole Burning Studies Of Photosystem Ii , Hai-Chou Chang Jan 1995

Spectral Hole Burning Studies Of Photosystem Ii , Hai-Chou Chang

Retrospective Theses and Dissertations

Low temperature absorption and hole burning spectroscopies were applied to the D1-D2-cyt b[subscript]559, and the CP47 and CP43 antenna protein complexes of Photosystem II from higher plants. Low temperature transient and persistent hole-burning data and theoretical calculations on the kinetics and temperature dependence of the P680 hole profile are presented and provide convincing support for the linker model. Implicit in the linker model is that the 684-nm-absorbing Chl a serve to shuttle energy from the proximal antenna complex to reaction center. The stoichiometry of isolated Photosystem II Reaction Center (PSII RC) in several different preparations is also discussed ...


Knowledge And Decision Support For Variable Rate Application Of Materials In Prescription Farming , Jack Robert Ambuel Jan 1995

Knowledge And Decision Support For Variable Rate Application Of Materials In Prescription Farming , Jack Robert Ambuel

Retrospective Theses and Dissertations

One major goal of prescription farming is to optimize application rates for seed fertilizer, and other agricultural inputs as a function of location within a field. There are four main components of a variable rate application system: (1) A method of determining the location of farm equipment (e.g. combines, tractors) within a field. (2) A system for controlling the application rate of materials (seeds, fertilizers, pesticides). (3) The capability to measure the results using a real time yield monitor. (4) An algorithm or prescription for determining what rates of materials to apply at each location. In this dissertation it ...


Characterization Of Genes Expressed During Vegetative Organ Development In Potato (Solanum Tuberosum L.) , Sang-Gu Kang Jan 1995

Characterization Of Genes Expressed During Vegetative Organ Development In Potato (Solanum Tuberosum L.) , Sang-Gu Kang

Retrospective Theses and Dissertations

The cp rps16 cDNA encoding the chloroplast ribosomal protein S16 and a MADS-box gene cDNA, POTM1-1, were isolated and characterized in potato (Solanum tuberosum L.) to understand molecular mechanisms of plant vegetative organ development;The rps16 gene is located between the trnK gene for tRNA Lys(UUU) and trnQ gene for tRNA Gln (UUG) on the same strand in the chloroplast genome. The ribosomal binding site, 5'-AGGA-3', is located at nucleotide position -6 to -9 from the initiation codon ATG. The coding sequence contains an 88 amino acid open reading frame (ORF) that is interrupted by an 855 bp ...


Measuring And Modeling Alachlor Dissipation In Soil , Dee Anna Jo Weed Jan 1995

Measuring And Modeling Alachlor Dissipation In Soil , Dee Anna Jo Weed

Retrospective Theses and Dissertations

Field and laboratory experiments evaluated the overall dissipation of alachlor (2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl) acetamide) and the effect of no-till and chisel-plow tillages on alachlor leaching and dissipation. In the top 30-cm layer of field soil, the time to 50% dissipation (half-life) was 2 to 3 d, and the time to 90% dissipation ranged from 17 to 30 d. In no-till soil, alachlor dissipated slightly faster, and more was transported into the 10-to-30-cm soil layer. The tillage effect depended on weather that favored movement into and dissipation within the soil, rather than dissipation on plant residues and the soil ...


Significance Of Gametophyte Form In Tropical, Epiphytic Ferns , Cynthia Lynn Dassler Jan 1995

Significance Of Gametophyte Form In Tropical, Epiphytic Ferns , Cynthia Lynn Dassler

Retrospective Theses and Dissertations

Fern gametophytes are variable in growth form and longevity. Most are short-lived and cordate in outline. Others are long-lived, ribbon-like or filamentous, and clone-forming, and some produce gametophytic gemmae. Literature, field, and laboratory studies reveal that persistent, clone-forming gametophytes are typical of rainforest epiphytes. Of this group, gametophytes of Elaphoglossaceae and Polypodiaceae lack gemmae, whereas gametophytes of Hymenophyllaceae, Grammitidaceae and Vittariaceae regularly produce gemmae. Correlation of long-lived, clonal gametophyte form with the epiphytic habitat suggests adaptation to the epiphytic habitat. In the epiphytic habitat, bryophytes are a ubiquitous presence, typically covering tree limbs and trunks with a dense mat of ...


Sources Of Variability In Nitrogen Availability In Iowa Cornfields , Carlos Honorio Perdomo Jan 1995

Sources Of Variability In Nitrogen Availability In Iowa Cornfields , Carlos Honorio Perdomo

Retrospective Theses and Dissertations

Studies were conducted to learn more about the spatial structure of soil NO[subscript]3[superscript]- concentrations in cornfields in late spring and to identify some major causes of variability in these concentrations. This information is specifically needed to aid in design of efficient sampling strategies for the late-spring test for nitrogen (N) availability, which is a new management tool that enables site-specific evaluation and adjustment of fertilization practices. One study assessed the importance of windrows of plant residue left by combines as a source of variability in soil nitrate (NO[subscript]3[superscript]-) concentrations for the next crop. Observations ...


Histochemical, Physiological And Ultrastructural Changes In The Maize Embryo During Drying , Jose Antonio Perdomo Jan 1995

Histochemical, Physiological And Ultrastructural Changes In The Maize Embryo During Drying , Jose Antonio Perdomo

Retrospective Theses and Dissertations

A critical decision that hybrid maize seed producers confront each year is how to properly dry large volumes of seed and still maintain a high quality product suitable for planting. In many production areas, harvest may begin quite early when the seed is at high moisture content (45-50%) in an effort to avoid damage by early frost or to escape the action of insects and diseases. In this scenario, varying rates of moisture removal and/or high drying temperatures (>45°C) may jeopardize seed quality. Previous studies (Herter and Burris, 1989) have shown that initial drying at lower temperatures (20 ...


Indigenous Knowledge Of Soil And Agriculture At Zuni Pueblo, New Mexico, Roman R. Pawluk Jan 1995

Indigenous Knowledge Of Soil And Agriculture At Zuni Pueblo, New Mexico, Roman R. Pawluk

Retrospective Theses and Dissertations

No abstract provided.


Observations On The Biosynthesis Of [Alpha]-Eleostearic And Vernolic Acids And The Accumulation Of Petroselinic Acid In Somatic Carrot Embryos , Linsen Liu Jan 1995

Observations On The Biosynthesis Of [Alpha]-Eleostearic And Vernolic Acids And The Accumulation Of Petroselinic Acid In Somatic Carrot Embryos , Linsen Liu

Retrospective Theses and Dissertations

Developing somatic embryos of carrots accumulated up to 24% petroselinate of total fatty acids, most of which was incorporated into triacylglycerols. Both triacylglycerol and petroselinate accumulation in the embryos were increased by addition of abscisic acid to the culture medium. The novel phenylethyl esters of the fatty acids were used to separate petroselinate from oleate both by gas chromatography and high performance liquid chromatography. This derivative offers the fastest and most efficient method for petroselinate analysis among the published procedures;The biosynthesis of vernolic acid in the developing seed of Vernonia galamensis was explored by using (1-14C) acetate in vivo ...


A Natural Area Inventory Of Ames, Iowa , William Russell Norris Jan 1995

A Natural Area Inventory Of Ames, Iowa , William Russell Norris

Retrospective Theses and Dissertations

Perhaps no state in the Union has suffered such widespread degradation of its natural vegetation as Iowa. Tallgrass prairie (including wet prairie communities, often considered to be wetlands) once covered at least 85% of this state's land area, but more than 99.9% of Iowa's original grasslands have fallen victim to the plow (Smith 1990). Wetlands once covered 11.1% of Iowa's landscape (Dahl 1990), but virtually all of these have been drained to make way for rowcrops (wetlands now cover only 1.2% of Iowa's landscape). Roughly 12 to 20% of the state was covered ...


Cloning And Characterization Of Two Chlorophyll Synthesis Genes Expressed During Tomato Fruit Development , Gary Francis Polking Jan 1995

Cloning And Characterization Of Two Chlorophyll Synthesis Genes Expressed During Tomato Fruit Development , Gary Francis Polking

Retrospective Theses and Dissertations

Full-length clones that encode tomato (Lycopersicon esculentum Mill.) glutamate-1-semialdehyde-2,1-aminomutase (GSAAM) and 5-aminolevulinic acid dehydratase (ALAD) were isolated and characterized. Sequence analysis showed that tomato GSAAM and ALAD clones exhibited a high level of homology to corresponding clones found in other plant species. The primary structure of GSAAM predicted a 481-amino acid precursor that comprised a 46.7 kDa, 437-amino acid mature protein and a transit peptide of 44 amino acids. The primary structure of ALAD predicted a 430-amino acid precursor that comprised a 41.7 kDa, 383-amino acid mature protein and a 47-amino acid transit sequence. Southern analysis showed ...


Ecology Of The Bean Leaf Beetle Cerotoma Trifurcata (Forster): Improving Preventive And Curative Insect Management , Michael Ralph Zeiss Jan 1995

Ecology Of The Bean Leaf Beetle Cerotoma Trifurcata (Forster): Improving Preventive And Curative Insect Management , Michael Ralph Zeiss

Retrospective Theses and Dissertations

Delayed planting of soybean was simulated by caging C. trifurcata beetles on selected plant species for 5 to 28 d, then transferring beetles to soybean. Plants tested were alfalfa ('Blazer' and 'Vernal'), oats ('Starter'), wheat ('Guard'), maize ('Garst 8532' and 'Renze 6338'), and soybean ('Corsoy 79') as a control. Females caged on grasses had shorter lifespans and lower oviposition rates than those caged on alfalfa. Lifespan and oviposition declined in proportion to number of days without soybean. Survivors from alfalfa regained relatively high oviposition rates once transferred to soybean. In contrast, beetles caged on grasses for 14 d or longer ...


Osmoconditioned Seeds As A Foodstuff , Julie Marie Goldman Jan 1995

Osmoconditioned Seeds As A Foodstuff , Julie Marie Goldman

Retrospective Theses and Dissertations

The technique of seed osmoconditioning, which consists of a controlled hydration and dehydration, was evaluated for use in foodstuff production;In the first experiment, soybean, wheat, mungbean, and sesame seeds were hydrated in polyethylene glycol (PEG), chitosan plus water (CH), citric acid (CA), and water (W). Hydrated seeds were either dehydrated to their original moisture content or left fully-hydrated and stored at 5°C or 15°C for 2 or 4 weeks. Fully-hydrated and dehydrated seeds sprouted faster than untreated seeds, but the performance of fully-hydrated seeds declined during storage. Phytate content in soybean and mungbean seeds increased with the ...


Development Of Microbial Control For Lepidopteran Pests Of The Corn Ear , Randall Lee Pingel Jan 1995

Development Of Microbial Control For Lepidopteran Pests Of The Corn Ear , Randall Lee Pingel

Retrospective Theses and Dissertations

The problems associated with chemical pesticide misuse have led to the search for alternative forms of insect pest management such as microbial control that are environmentally and ecologically sound. The efficacy of three Bacillus thuringiensis Berliner (Bt) products and Anagrapha falcifera multiple nuclear polyhedrosis virus (AfMNPV) to control Helicoverpa zea (Boddie) was evaluated in the laboratory and in the field on corn. The virulence of the entomopathogens for Ostrinia nubilalis (Hubner) and Spodoptera frugiperda (J. E. Smith) was also evaluated in the laboratory;Three Bt products (HD-1-S-1980, Javelin°ler, and XenTari°ler) and AfMNPV were tested in the laboratory. The ...