Digital Commons Network^™

Division Magnoliophyta – Class Magnoliopsida, Stanley L. Welsh, N. Duane Atwood, Sherel Goodrich, Larry C. Higgins

Great Basin Naturalist Memoirs

No abstract provided.

A Taxonomic Re-Evaluation Of Specimens Of The Genus Caloplaca In The E.L. Stover Herbarium Of Eastern Illinois University, Eric J. Cameron

Masters Theses

The genus Caloplaca is the largest genus in the family Teloschistaceae. The 103 species in the genus greatly outnumber any other in the family. Lichens of the genus Caloplaca are usually orange to orange-yellow in color, and range from crustose to subfoliose in form. The orange color is due to an anthraquinone, parietin, the location of which is taxonomically important in this genus of lichens. In some species it occurs only in the apothecia, while in others it is found in both the apothecia and thallus. The spores of this genus are polarilocular, and the width of the isthmus is …

Physiological Changes In Portulacaria Afra (L.) Jacq. During A Summer Drought And Rewatering, Lonnie J. Guralnick, Irwin P. Ting

Arts & Sciences Faculty Publications

The changes of titratable acidity, enzyme activity, water status, and pigment composition were studied in Portulacaria afra (L.) Jacq. during a normal summer drought and rewatering. Two groups of plants were grown outside under a clear plastic canopy with water stress initiated at 2-week intervals in May 1986. Drought resulted in a linear decrease of fresh weight for 80 days and there was no further fresh weight change for the next 65 days. Nocturnal CO(2) uptake remained measurable for 83 days. Cessation of exogenous CO(2) uptake corresponded to the point where the pressure potential (Psi(p)) became zero. Ribulose-1, 5-bisphosphate (RuBP) …

Characteristics Of Successful Competitors: An Evaluation Of Potential Growth Rate In Two Cold Desert Tussock Grasses, Eissenstat D. M., Caldwell M. M.

Aspen Bibliography

Within the first few weeks after seedling emergence, Agropyron desertorum, a more competitive tussock grass, had a much higher mean relative growth rate (RGR) than Agropyron spicatum, a very similar, but less competitive species. However, beyond the early seedling stage, the two grasses had a remarkably similar whole-plant RGR in hydroponic culture and aboveground RGR in glasshouse soil, if root temperatures were above approximately 12° C. At soil temperatures between 5 and 12° C, A. desertorum exhibited a 66% greater aboveground RGR than A. spicatum (P < 0.05). Both species responded similarly to warming soil temperatures. In the field, however, tiller growth rates were generally similar. Neither species showed marked tiller elongation until a couple of weeks after snowmelt, by which time soil temperatures, at least to a depth of 10 cm, were above 12° C for a significant portion of the day. Above-ground biomass accumulation over a three-year period indicated that both grasses had similar potential growth rates whereas Artemisia tridentata ssp. vaseyana, a common neighbor planted in the same plots, had a much greater potential growth rate. The greater competitive ability of adult A. desertorum, as compared to A. spicatum, cannot be attributed to appreciable differences in potential growth rates.

New And Corrected Records Of The Flora Of Nebraska, Steven B. Rolfsmeier, Robert B. Kaul, David M. Sutherland

Biology Faculty Publications

New distributional data are provided for 27 species of vascular plants in Nebraska, eight newly recorded as growing wild in the State. The record of one species previously attributed to the State is shown to be based upon misidentified specimens, the range of another is shown to be much more restricted in Nebraska than previously reported, and nomenclature is corrected for two species.

Infection Rate Of Tall Fescue With Acremonium Coenephialum, B. J. Hankins, Terry Kirkpatrick

Journal of the Arkansas Academy of Science

No abstract provided.

Discovery Of Lycopodium Communities In The Gulf Coastal Plain Region Of Arkansas, James H. Peck, Carol J. Peck, Steve L. Orzell, Edwin Bridges, Carl Amason

Journal of the Arkansas Academy of Science

No abstract provided.

Pliocene Nothofagus Wood From The Transantarctic Mountains, Sherwin Carlquist

Aliso: A Journal of Systematic and Floristic Botany

Subfossil wood fragments up to 10 cm long and 2 cm in diameter recovered from a locality thought on the basis of diatom deposits to be upper Pliocene-lower Pleistocene (Oliver Bluffs, Sirius Formation, 85°10'S., between 1800 and 1900 m in the Transantarctic Mountains) were sectioned for identification. Degradation prevented observation of some wood features, but others were well preserved. All of the fragments appear to represent one species. Features of growth rings (ring porous, vessels mostly solitary in earlywood), rays (predominantly uniseriate, both erect and procumbent cells common), vessel perforation plates (simple, at least in earlywood), lateral wall pitting of …

New Species, Combinations, And Notes In Ipomopsis (Polemoniaceae), James Henrickson

Aliso: A Journal of Systematic and Floristic Botany

Ipomopsis wendtii and Ipomopsis aggregata subsp. carmenensis are described as new from the Sierra del Jardín and Sierra del Carmen in northern Coahuila, Mexico, Ipomopsis pringlei is recognized as specifically distinct from Ipomopsis macombii. Gilia calothrysa is considered synonymous with I. macombii, and Ipomopsis effusa is reported as new to the floras of California and the United States.

Effects Of Mineral Nutrition On Components Of Reproduction In Clarkia Ungucilata, Frank C. Vasek, Vincent Weng, Robert J. Beaver, Charles K. Huszar

Aliso: A Journal of Systematic and Floristic Botany

An experiment was conducted to determine the effects of nutritional level and flower location on factors related to flower, pollen, and ovule production, and to determine what developmental patterns would be modified to mediate any observed changes. Plants subjected to high nutrient levels developed larger leaves, more branches, more flowers on both the main stem and the branches, and opened their first flowers 6 days sooner than plants at lower levels of nutrients. Total flower number increased from 72.2 to 626.8 per plant, with most of the increase produced on the primary branches. The number of pollen grains in the …

Lipogenesis In Adipose Tissue From Ovariectomized And Intact Heifers Immunized Against Estradiol And(Or) Implanted With Trenbolone Acetate, L. C. St. John, P. A. Ekeren, J. D. Crouse, B. D. Schanbacher, S. B. Smith

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Forty-two heifers were allotted randomly to six treatment groups: 1) intact controls, 2) intact heifers implanted with trenbolone acetate, 3) ovariectomized heifers, 4) ovariectomized heifers implanted with trenbolone acetate, 5) intact heifers immunized against estradiol and 6) intact heifers immunized against estradiol and implanted with trenbolone acetate. Blood titers of estradiol-17β were increased over lO0-fold in heifers immunized against estradiol in Freund's complete adjuvant or saline:squalene/arlacel containing Mycobacterium. Lipogenic enzyme activities and acetate incorporation into fatty acids were increased in subcutaneous adipose tissue obtained at slaughter from heifers receiving immunization or the combination of immunization and trenbolone acetate. The increased …

Experiments On Grain Yield In A Range Of Old And Modern Wheat Varieties., K. H.M. Siddique, D. Tennant, R. K. Belford, M. W. Perry, L. Mclaughlin, A. R. Thompson

Experimental Summaries - Plant Research

Growth, yield, water use and water use efficiency of old and modern wheat varieties in a mediterranean type environment, 87M17 and 87WH14. Ear and stem dry matter at anthesis and grain yield in a range of wheat varieties, 87M18.

Research And Development Strategies For A Sustainable Agriculture, Charles A. Francis

Department of Agronomy and Horticulture: Faculty Publications

"Food production and rural income are two prime concerns of Third World governments. Increased food production and greater food security are goals which countries strive to achieve through agricultural development. The technologies generated by research, commonly known as green revolution methods, have provided an impetus to food production in some favored zones where resources are available to take advantage of this production package. New varieties, productive and responsive to fertilizer, have bought time while countries work to control population growth and develop agriculture and industry" (Francis and Harwood, 1985).

The pioneering work of the International Agricultural Research Centers has been …

Evaluation Of Repellent Seed Treatments And Effects On Early Corn Performance, Ann E. Koehler, Ron J. Johnson, Orvin C. Burnside, Stephen R. Lowry

Department of Agronomy and Horticulture: Faculty Publications

A combination of field, field enclosure, and germination chamber studies was used to evaluate the effects of methiocarb [3,5-dimethyl-4-(methylthio)phenol methylcarbamate] and thiram (tetramethylthiuram disulfide) repellent seed treatments on early corn performance. The thiram treatments used (0.08, 0.4,0.8,0.5,1.25, and 2.5% active ingredient by corn seed weight) had negligible effects on germination/emergence time or on com plant heights. The thiram treatments never reduced stand counts in comparison to controls, but apparently increased stand counts in some trials, particularly under wet conditions. The methiocarb treatments evaluated (0.5, 1.25, 2.5, and 5.0% active ingredient by corn seed weight) had only occasional effects on early …

Reproductive Structure Of Lithocarpus Sensu Lato (Fagaceae): Cymules And Fruits, Robert B. Kaul

School of Biological Sciences: Faculty Publications

Seventy-three species were examined for structural and developmental details of the cymules and fruits. The cymules bear one to seven or more flowers and are subtended by one to nine or more bracteoles. Generally, the number of flowers and bracteoles in the pistillate cymules is the same or less than in the staminate ones. Some of the latter have an inner set of bracteoles that could be homologous to the pistillate cupule. Scales are present at anthesis on the cupules of all species examined, but in some species they fail to enlarge, are torn or disintegrate, or fall away as …

Cyanogenic Plants Of Illinois, Kevin E. Aikman

Masters Theses

Cyanogenesis in 50 species of vascular plants collected from east central Illinois was studied by examining 10 populations of each species. Each population consisted of 30 individuals, which gave an over all sample size of 300 plants per species. Herbarium specimens from the Stover Herbarium of Eastern Illinois University (EIU) were also tested for the presence of cyanide. More than 20,000 specimens were tested for this study which included cultivated plants, introduced weeds, and native plant species. The speed and degree of the HCN reaction as well as the specific plant part tested were included to give a more specific …

Medicinal Herbs Of Central Illinois, James E. Hefley

Masters Theses

A survey of the medicinal plants of central Illinois was conducted from fall of 1985 to the summer of 1987. This study concentrated on those herbaceous plants which have a scientific basis for their medicinal value. The study range included the following counties: Coles, Moultrie, Shelby, Fayette, Christian, and Montgomery.

In this paper, 58 species were considered, representing 33 families. A description of external morphology is included for each specimen, as well as folknames and habitat preferences. In addition, the medicinal qualities and active constituents are included for each specimen, as well as comments about their scientific and folknames.

In …

Division Lycopodiophyta, Stanley L. Welsh, N. Duane Atwood, Sherel Goodrich, Larry C. Higgins

Great Basin Naturalist Memoirs

No abstract provided.

Introduction (English, French, German, And Spanish), Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

Division Magnoliophyta – Class Liliopsida, Stanley L. Welsh, N. Duane Atwood, Sherel Goodrich, Larry C. Higgins

Great Basin Naturalist Memoirs

No abstract provided.

Division Polypodiophyta, Stanley L. Welsh, N. Duane Atwood, Sherel Goodrich, Larry C. Higgins

Great Basin Naturalist Memoirs

No abstract provided.

Division Equisetophyta, Stanley L. Welsh, N. Duane Atwood, Sherel Goodrich, Larry C. Higgins

Great Basin Naturalist Memoirs

No abstract provided.

Glossary, Stanley L. Welsh, N. Duane Atwood, Sherel Goodrich, Larry C. Higgins

Great Basin Naturalist Memoirs

No abstract provided.

Description Of The Environment, Stanley L. Welsh, N. Duane Atwood, Sherel Goodrich, Larry C. Higgins

Great Basin Naturalist Memoirs

No abstract provided.

T–Z, Anonymous, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

I–L, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

A–D, Stephen L. Wood, Donald E. Bright Jr.

Great Basin Naturalist Memoirs

No abstract provided.

Virus Disease Of Small Fruits, R. H. Converse

School of Biological Sciences: Faculty Publications

This illustrated handbook was compiled by international authorities on virus and viruslike diseases of small fruits. Crops covered are in the plant genera Fragaria (strawberry), Vaccinium (blueberry and cranberry), Ribes (currant and gooseberry), and Rubus (blackberry and raspberry). The history, geographic distribution, importance, symptoms, transmission, cause, detection, and control of virus and viruslike diseases attacking these crops are discussed.

A Guide To The Identification And Control Of Insect Pests In Maize Crops Grown Int He Ord River Irrigation Area, S.E. Learmonth

Grain and other field crops published reports

The importance of insect pests in Ord maize crops is seasonal both in terms of their abundance and the species present. It is therefore desirable that the main pests of maize can be recognized quickly and appropriate action taken to avoid crop loss

In this guide, all of the common insect pests likely to be encountered in Ord maize crops are described. Photographs of only the more important of these and some of their natural enemies are included. Any insect that cannot be readily identified may be taken to the office of the Department of Agriculture.

A section on insect …

The Role Of Iron Nutrition In Regulating Patterns Of Photosynthesis And Nitrogen Metabolism In The Green Alga Scenedesmus Quadricauda, Dennis Raymond Ades

Dissertations and Theses

The influence of iron nutrition on patterns of photosynthetic behavior, nitrogen metabolism, and fixed-carbon allocation is reported for a common freshwater green alga. Cultures of Scenedesmus quadricauda were grown in Fraquil medium in which iron concentrations ranged from 1.0 μM to 0.01 μM (log 10-6 to 10-8 M, respectively). Carbon 14 and nitrogen uptake experiments were conducted at photosynthetically saturating and subsaturating photon flux densities.