Life Sciences Commons^™

The Genus Hedysarum In North America, Terry Edwin Northstrom

Theses and Dissertations

In North America, Hedysarum taxa extend from southern Arizona to Banks Island and from northern Alaska to Newfoundland. They exhibit a high degree of polymorphism which is usually expressed in the form of a gradient in morphological characteristics. Four species, one subspecies and four varieties are recognized, including one new combination, H. boreale ssp. boreale var. rivulare (Williams) Northstrom. Comparative anatomical and morphological studies revealed two basic patterns. Chromosome numbers of all taxa were determined. The basic chromosome number of H. alpinum, H. sulphurescens and H. occidentale is n=7. The basic chromosome number of H. boreale is n=8. Seed protein …

A Revision Of The Astragalus Lentiginosus Complex For The State Of Utah, Carol Susan Schoener

Theses and Dissertations

The taxonomy and distribution of the Astragalus lentiginosus complex in Utah is presented. The nine varieties are listed and a key is provided which allows determination of the members of the complex in Utah. Each entity is discussed and illustrated. Two distribtuion maps are included for each variety, one showing the distribution in Utah and the other, the general range of the entity. The body of this work is based on the study of herbarium specimens and field observations and collection. These studies have resulted in the synonymizing of two varieties, the inclusion of another and one nomenclatural change.

Evidence Of Eutrophication In Wall Lake Barry County, Michigan, John J. Meany

Masters Theses

No abstract provided.

Some Aspects Of Vegetation Response To A Moisture Gradient On An Ephemeral Stream In Central Arizona, Deborah Ann Bloss

Theses and Dissertations

Ecological aspects of desert vegetation in relation to a moisture gradient of an ephemeral stream in central Arizona were investigated. The stream channel, flood plain and north, west, south, east facing slopes represent a moisture gradient going from most mesic to most xeric conditions. In parts of the system, vegetation from the stream channel intergraded into flood plain vegetation which in turn intergraded into slope vegetation types. In other areas there are sharp delineations between stream channel and flood plain, and between flood plain and slope. Trees and legumes preferred medium moisture habitats, while forbs, shrubs and succulents preferred the …

Metabolism Of 3-Isopropyl-4h-2,1,3-Benzothiadiazin-4-(3h)-One-2,2-Dioxide (Bentazon) In Agitated And Non-Agitated Sediment, David Cortez Gutierrez

Theses and Dissertations

Bentazon, (3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-l-2,2-dioxide) a new experimental herbicide, was studied under the effects of sterile and non-sterile conditions, 12 hours light: 12 hours dark and totally dark conditions, and agitated and non-agitated conditions in aquatic sediment. The effects of the different levels of BOD/COD values on the decomposition of Bentazon were studied. Photoperiod, sterility, and BOD/COD levels appeared to have no influence in the breakdown of Bentazon. Agitation-time interaction appeared to be the only factor that influenced the more rapid degradation of Bentazon. Bentazon was the major 14C-residue found in the water; it was followed by an unknown. The third major metabolite …

A Taxonomic And Ecologic Study Of The Riverbottom Forest On St. Mary River, Lee Creek And Belly River In Southwest Alberta, Canada, Robert Keith Shaw

Theses and Dissertations

The riverbottom forest community of St. Mary River, Lee Creek and Belly River in southwest Alberta, Canada is a unique ecological entity characterized by poplar species having their major Alberta distribution along these streams. Stands in the community are dominated by three tree species, six shrub species and nine herb species. Establishment of the community is dependent on climate and substrate; destruction is the result of progressive lateral stream-flow erosion. Soils are sandy loams above gravel, with pH values of 7.7 to 8.0 and soluble salt concentration of 176 to 458 parts per million. Trees in mature stands averaged 23.0 …

The Algae Of Huntington Canyon, Utah, Carol Jean Endsley

Theses and Dissertations

A taxonomic study of the algae of Huntington canyon, Emery County, Utah, was conducted from March 1971 to April 1972. The algal flora of this cold, fast-flowing, hard-water mountain creek consisted of ninety-five genera, one hundred ninety-six species, twenty-nine varieties, and two forms. This diverse flora was dominated by many different species with usually rather few individuals of Achnanthes, Cymbella, Diatoma, Gomphonema, Lyngbya, Navicula, Nitzschia, Oscillatoria, Synedra, and Ulothrix.

Coastal Vegetational Communities Of The Two Texas Barrier Islands, Boca Chica And Brazos, Baltazar Cisneros

Theses and Dissertations - UTB/UTPA

Two Texas barrier islands, Boca Chica and Brazos, have unique coastal vegetational communities that may be Influenced by several environmental factors. These environmental factors include temperature, precipitation, wind speed, sunshine exposure, day length, and dune height. The purpose of this investigation was to determine the total number of coastal plant species per station, season, and year and to consider environmental factors that may significantly affect the number and pattern of coastal species. Coverage comparison between aerial and land sampling and aerial vegetational zonation was also considered.

Results indicated the presence of 21 angiosperm families and a total of 54 species. …

Implications For Microtubule Mediated Ethylene Effects In Pea Stem Sections, David A. Steen

Loma Linda University Electronic Theses, Dissertations & Projects

The marked effects of ethylene on pea stem growth have been investigated. Low temperature mid colchicine. both known microtubule depolymerization agents, reverse the effects of ethylene in straight growth tests. Low temperature (6 C) also profoundly reduces the effects of the gas in terms of swelling, hook curvature, and horizontal nutation. Electron microscopy shows that microtubules are reoriented after treatment with ethylene for as little as 12 hours. The findings indicate that some of the ethylene responses may be due to a stabilizing effect on microtubules in plant cells.

Nutrition Of Sheep Grazing Foothill Big Game Range In Spring, Kurt J. Kotter

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Sheep with esophageal fistulas were used to determine the daily intake, nutritive content and digestibility of forage at three periods and two stocking intensities during the spring of 1972 on a typical foothill range in northern Utah.

Heavy grazing under a season-long regime did not influence the concentrations of dietary chemical components when compared to moderate grazing; however, it did depress the digestibility of cellulose and organic matter. There was a significant decline in the dietary chemical components due to forage maturation. Digestibility of organic matter and cellulose were significantly higher in the early spring as compared to late spring. …

Comparison Of Protein, Forage, And Root Yield Data Of Five Pasture Mixtures As Influenced By Clipping, Irrigation, And Nitrogen Fertilization, Clair E. Blaser

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A study was made to compare the protein and forage yield and root dry weight data of five pasture mixtures as influenced by two clipping frequencies (28 and 35 day clipping intervals), three irrigation intervals (1 inch every 5 days, 2 inches every 10 days and 4 inches every 20 days) and four levels of nitrogen fertilization (0, 50, 100, and 200 pounds per acre). The study was conducted at the Greenville Farm, Logan, Utah. The farm has about 1 percent surface slope and is a well-drained Millville silt loam that occurs on an alluvial fan. It is high in …

The Phenology And Control Of Dyers Woad (Isatis Tinctoria) In Northern Utah, William A. Varga

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this thesis is to describe dyers woad and to establish v means for control of the weed in northern Utah. Logan was chosen for studying germination of the weed, and interaction of dyers woad and alfalfa stands. Collinston was selected for screening trials of herbicides for the control of dyers woad. The thesis contains information on the phenology of dyers woad and suggestions for control of the weed.

Seasonal Changes Of Peach Flower Buds At The Ultrastructural Level, Yeh Feng

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study was conducted to gain a better understanding of the seasonal changes of Gleason Elberta peach flower buds at the cellular level. Peach buds were obtained from the Howell Experiment Station in Ogden, Utah. Samples were collected at weekly intervals from October 25th, 1971 to March 29th, 1972. When a killing frost precluded further sampling, the buds were preserved by standard electron microscopic techniques. Thin sections (500 to 700 A) of the cells around the ovarious cavity were examined with a Zeiss EM-9S-2A electron microscope.

From October 25th, 1971 to January 3rd, 1972, more heterochromatin than euchromatin was in …

Anatomical Effects Of Dicamba On Pea Root Tissues, Brent George Ovard

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Peas (Pisum sativum L. Var Alaska) were allowed to absorb calcium and magnesium chloride for 8 hours and then were germinated in a potassium phosphate buffer pH 6.5 for 40 hours. Peas were then treated with 0, 0.1, 0.3, or 0.5 ppm dicamba (3,6-dichloro-o-anisic acid) and harvested at 24, 48, and 72 hour intervals. The following determinations were recorded: root elongation, nuclear volume, and anatomical modifications.

Root elongation recordings showed that dicamba prevented normal root elongation. Treatments induced very short thick primary roots.

Measurements of nuclear volume indicated that all herbicide concentrations were able to reduce the …

Meiotic And Mitotic Chromosomes Of Fritillaria Atropurpurea Nutt., John Keith Archibald

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this paper is to provide information concerning the number, structure, and behavior of chromosomes in the plant species Fritillaria atropurpurea. The material used for this investigation included both floral buds and root-tips from actively growing naturally occurring plants collected from populations in both Utah and Nevada, and root-tips from seed germinated in the greenhouse. The results obtained include a karyotype analysis of mitotic chromosomes, a discussion of meiosis, a discussion of B-chromosomes, and a series of photographs depicting the stages of mitosis and meiosis in this species.

Fritillaria atropurpurea has a diploid chromosome number of 24, …

The Dynamics Of Root Growth And The Partitioning Of Photosynthates In Cool Desert Shrubs, Osvaldo Alberto Fernandez

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study addresses the nature of physiological and phenological evolutionary strategies of root growth dynamics and energy allocation followed by Atriplex confertifolia, Ceratoides lanata, and Artemisia tridentata growing in their natural cool desert environment.

Root observation chambers with inclined Plexiglass windows were installed in monospecific desert communities of Atriplex confertifolia, Ceratoides lanata and Artemisia tridentata. Soil temperature and water potential measurements taken immediately adjacent to the observation windows indicated a minimal disturbance was caused by the presence of these chambers. For the three species initiation of root growth was observed before initiation of shoot activity, furthermore, active root growth extended …

A Study Of The Radiation Quality Under Plant Canopies In The Wave Range 0.4 To 2.5 Microns, Nolasco G. Baldazo

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The spectral distribution of the global radiation from 0.4 to 2.5 microns penetrating deciduous and coniferous canopies were measured during clear days between 10 a.m. and 2 p.m. using a double-quartz monochromator.

In the visible region (0.4 to 0.7 micron) the average relative spectral transmissions under both canopies are about one percent beginning at 0.4 micron and decreasing to about half a percent at 0.67 micron. There is only a small peak in the green (0.55 micron) transmission under deciduous stands while there is none under coniferous canopies. The slightly higher transmission in the blue (0.4 micron) is attributed to …

Ecological Aspects Of Cercocarpus Montanus Raf. Communities In Central Utah, David Lee Anderson

Theses and Dissertations

Ecological and environmental aspects relating to Cercocarpus montanus Raf. Communities were investigated. Twenty study sites were sampled and described. All factors were then analyzed utilizing statistical methods. Signigicantly correlated factors to C. montanus parameters (i.e., frequency, density, cover, height) were: positive correlation--percent clay, percent clay-silt, percent litter cover, and total soluble salts in soil; negative correlation--percent silt-sand, percent sand, soil pH; exposed surface rock, Amelanchier alnifolia cover, Gotierrezia sarothrae cover and altitude. Several individual factors were singled out as being of importance in C. montanus communities; howerver, it was shown that a combination of factors was most important in determining …

The Coastal Plain Floristic Element In Michigan, Gary J. Pierce

Masters Theses

No abstract provided.

Light And Electron Microscopy Of Resistant And Susceptible Alfalfa Roots Infected By Meloidogyne Hapla, Bernard Al Tait

Theses and Dissertations

Resistant (65-410 and 65-393) and susceptible (breeders Lahontan) alfalfa seedlings were infected with the Northern root-knot nematode, Meloidogyne hapla. Infected roots were fixed, stained, and embedded in plastic for ultrastructural investigations. Sections of plastic embedded tissue, cut at 0.5-1.5 microns for light microscopy investigations, were stained with various histochemical stains to determine the chemical composition of the nematode-altered tissues. In the susceptible cultivar, giant cells were formed by enlargement of nematode-stimulated cells without cell wall lysis. The giant cells became multinucleate by karyonkinesis without cytokinesis. Proplastids in the giant cells became structurally altered to form tubular complexes. The resistant plants …

The Diatom Flora Of The Provo River, Utah, Laurie Linwood Lawson

Theses and Dissertations

The present study was undertaken to investigate the diatom flora of a major river in northern Utah, to determine the diatom species present, and to illustrate them in a manner useful for future diatom researchers in the intermountain region. It is hoped that this work will aid in algal productivity, ecological, and taxonomic studies of Rocky Mountain streams and rivers.

Aspects Of Salt Tolerance Of Salicornia Pacifica Standl. Var. Utahensis (Tidestrom) Munz, Dennis J. Hansen

Theses and Dissertations

Aspects of salt tolerance of Salicornia pacifica were investigated. Survival of this plant in a saline environment is due to many interacting factors. A soil pH of 7.5 to 8.0 +- 0.2 and a constant sub-surface soil moisture level of 25 to 35% are necessary for plant survival. A fluctuating lower soil moisture leevel and higher pH favor etablishment of Distichlis stricta. The ion content in S. pacifica remained constant despite increased moisture stress throughout the growing season due to accumulation of salts which were significantly higher in the surface soil layers than in the subsurface layers around the roots. …

Forest Vegetation And Site Relationships In The Central Portion Of The Great Smoky Mountains National Park, Michael Stanley Golden

Doctoral Dissertations

The primary objectives of this study were (1) to apply recently developed quantitative vegetation analysis procedures to the problem of describing the forest vegetation of the central portion of the Great Smoky Mountains National Park, (2) to group samples into forest types based on the importance of a large number of taxa and to compare the results with studies using types defined by relative density or basal area of canopy dominants, (3) to assess and further define the relationships of vegetation pattern with elevation and with topographic characteristics, (4) to examine possible relationships between soil characteristics and vegetation pattern, and …

Quantitative Gene Action And Interrelationships Of Protein Content With Some Metrical Traits Of Oats, Harbans Singh Sraon

Electronic Theses and Dissertations

The objectives of this study were (a) to determine gene action, heritability and number of effective factors controlling protein content in oats, (b) to investigate the interrelationships of protein content with other agronomic characters, and (c) to evaluate the feasibility of utilizing A. sterilis germplasm in oat breeding projects. Four genetically distinct cultivars with protein content ranging from 15.7 to 26.6 percent were crossed in all possible combinations to make a complete set of diallel crosses. The data suggested additive gene action and partial dominance for protein content. Groat percentage and number of panicles showed overall partial dominance. Yield and …

Improving Water Use Efficiency Of Smooth Bromegrass By Selecting For Regrowth, Delmer F. Gross

Electronic Theses and Dissertations

Sixty-nine genotypes, including 60 from the variety Saratoga smooth bromegrass, three from South Dakota 7 smooth bromegrass, and two each of reed canarygrass, orchardgrass, and creeping meadow foxtail as check species were selected for regrowth from a source nursery containing over 37,000 genotypes. In addition, four genotypes of Saratoga with poor regrowth capability were selected as checks. These 73 genotypes were placed in a greenhouse environment to evaluate digestibility (IVDMD), and other characteristics. After three harvests, 34 genotypes were vegetatively propagated in a field experiment to determine regrowth capabilities. NCE rates were not correlated highly with yield in the greenhouse …

The Morphology And Cytology Of Preussia Vulgare (Corda) Cain, Marcial Antonio Pastor-Corrales

Masters Theses

No abstract provided.

Edaphic Adaptations In Talinum Teretifolium (Portulacaceae), Gary Eugene Pinion

Dissertations, Theses, and Masters Projects

No abstract provided.

Measurement Of Soil Water Potential By Adsorption Conductivity, V. Philip Rasmussen Jr.

Undergraduate Honors Capstone Projects

Current methods of measuring soil water potential are reviewed, and the limitations of each are noted. The need for a transducer that will measure soil water potential over a wide moisture range for long periods of time is delineated. The concept of utilizing an adsorptive surface that resembles the soil in its water holding capacity as a transducer is discussed. Various designs and materials are tested for such a transducer.

All designs tested did not fulfill the requirements needed for a truly useful transducer. However, experimental results show that modification of the adsorptive surface should allow construction of a unit …

Vascular Vegetation Of Moultrie County, Illinois, Larry M. Dennis

Masters Theses

No abstract provided.

Megasporogenesis And Early Embryogeny Of Sanguinaria Canadensis L. (Bloodroot), Stephen R. Foor

Masters Theses

No abstract provided.