Digital Commons Network^™

Additive And Nonadditive Effects Of Herbivory And Competition On Tree Seedling Mortality, Growth, And Allocation, Scott J. Meiners, Steven N. Handel

Faculty Research & Creative Activity

The interaction between simulated cotyledon herbivory and interspecific competition was studied in a greenhouse experiment using two species of trees, Acer rubrum and Quercus palustris, which commonly invade abandoned agricultural fields. Herbivory treatments were applied as a gradient of cotyledon removal for A. rubrum with 0, 25, 50, 75, and 100% of cotyledon tissue removed. Cotyledons from Q. palustris were clipped and removed (control, early, and late removal) to create a gradient of seed reserve availability. The competition treatment consisted of plugs of old-field vegetation that filled the pots with perennial cover. Mortality of seedlings was higher with competition. There …

The Intellectual And Technical Property Components Of Pro-Vitamin A Rice (Goldenricetm): A Preliminary Freedom-To-Operate Review, R. David Kryder, Stanley P. Kowalski, Anatole F. Krattiger

Law Faculty Scholarship

Rice is a staple food for millions of people, predominantly in Asia, but lacks essential nutritional components such as Vitamin A. This is very important for over 180 million children and women of child bearing age who suffer from Vitamin A deficiency in Asia alone. For this reason, an improvement was made under an effort led by Profs. Ingo Potrykus and Peter Beyer by inserting several genes into rice to produce an improved product called GoldenRice. Because GoldenRice has the potential to be easily integrated into the farming systems of the world's poorer regions, the advent of GoldenRice promises to …

An Est-Enriched Comparative Map Of Brassica Oleracea And Arabidopsis Thaliana, Tien-Hung Lan, Terrye A. Delmonte, Kim P. Reischmann, Joel Hyman, Stanley Kowalski, Jim Mcferson, Stephen Kresovich, Andrew H. Patterson

Law Faculty Scholarship

A detailed comparative map of Brassica oleracea and Arabidopsis thaliana has been established based largely on mapping of Arabidopsis ESTs in two Arabidopsis and four Brassica populations. Based on conservative criteria for inferring synteny, “one to one correspondence” between Brassica and Arabidopsis chromosomes accounted for 57% of comparative loci. Based on 186 corresponding loci detected in B. oleracea and A. thaliana, at least 19 chromosome structural rearrangements differentiate B. oleracea and A. thaliana orthologs. Chromosomal duplication in the B. oleracea genome was strongly suggested by parallel arrangements of duplicated loci on different chromosomes, which accounted for 41% of loci mapped …

Additive And Nonadditive Effects Of Herbivory And Competition On Tree Seedling Mortality, Growth, And Allocation, Scott Meiners, Steven Handel

Faculty Research & Creative Activity

The interaction between simulated cotyledon herbivory and interspecific competition was studied in a greenhouse experiment using two species of trees, Acer rubrum and Quercus palustris, which commonly invade abandoned agricultural fields. Herbivory treatments were applied as a gradient of cotyledon removal for A. rubrum with 0, 25, 50, 75, and 100% of cotyledon tissue removed. Cotyledons from Q. palustris were clipped and removed (control, early, and late removal) to create a gradient of seed reserve availability. The competition treatment consisted of plugs of old-field vegetation that filled the pots with perennial cover. Mortality of seedlings was higher with competition. There …

Season And Distance From Forest - Old Field Edge Affect Seed Predation By White-Footed Mice, Scott J. Meiners, James T. Mccormick

Faculty Research & Creative Activity

We studied the spatial pattern of seed predation across a forest-old field edge in both fall and winter to assess the potential for seed predators to influence plant spatial patterns. We used a 100 x 100 m grid that began 30 m inside the forest and extended 60 m into the old field. Inside this grid we placed seed stations at regular 10 m intervals and monitored seed removal. Seed predation varied significantly across the edge gradient in both fall and winter with the highest rate of seed removal at the edge in both trials. The spatial pattern of seed …

Going Beyong The Third Grade Science Kit: An Integrated Thematic Approach, Michele D. Wiederspohn

All Graduate Projects

A project has been developed to aid in the design of a third grade science program and/or to be used as a supplement to any existing third grade science curriculum. The project has been organized into fourteen lesson plans. Each lesson plan includes an overview of the lesson, student learning objectives matched to the Washington State Essential Academic Learning Requirements, activities, a list of required materials, an outline of instruction, and the name of a trade book to compliment the lesson. Current literature and research regarding the topic of integrated curriculum were explored.

A Scanning Electron Microscopic Study Of The Infection Of Water Oak (Quercus Nigra) By Taphrina Caerulescens, Josephine Taylor, Dale O. Birdwell

Faculty Publications

The fungal pathogen Taphrina caerulescens was isolated from leaves of water oak (Quercus nigra) exhibiting symptoms of oak leaf blister. Healthy leaves were inoculated with a suspension of cells from pure culture in order to examine the infection process. Scanning electron microscopy was used to monitor budding of T. caerulescens cells, formation of germ tubes, and indirect penetration of leaf tissue through stomata, which occurred within 48 h post-inoculation. Direct penetration was not observed.

Clothes Moths, Jay B. Karren

All Archived Publications

No abstract provided.

Season And Distance From Forest - Old Field Edge Affect Seed Predation By White-Footed Mice, Scott Meiners, James Mccormick

Faculty Research & Creative Activity

We studied the spatial pattern of seed predation across a forest-old field edge in both fall and winter to assess the potential for seed predators to influence plant spatial patterns. We used a 100 x 100 m grid that began 30 m inside the forest and extended 60 m into the old field. Inside this grid we placed seed stations at regular 10 m intervals and monitored seed removal. Seed predation varied significantly across the edge gradient in both fall and winter with the highest rate of seed removal at the edge in both trials. The spatial pattern of seed …

The Home Orchard Pest Management Guide, Diane Alston, Sherman Thomson

All Archived Publications

No abstract provided.

Agroforestry In The United States: Research And Technology Transfer Needs For The Next Millennium

United States Department of Agriculture, Forest Service / University of Nebraska-Lincoln: Faculty Publications

If society's needs and aspirations for forestderived goods, services, and amenities truely are to be met, we must find ways of augmenting traditional forestry by gleaning some portion of these benefits from agricultural lands. For example: windbreaks, riparian forest buffers, hybrid poplar trees, farm woodlots, and grazing/timber systems.

Phylogenetic Relationships In Phoradendreae (Viscaceae) Inferred From Three Regions Of The Nuclear Ribosomal Cistron. Ii. The North American Species Of Phoradendron, Vanessa E. T. M. Ashworth

Aliso: A Journal of Systematic and Floristic Botany

A parsimony analysis based on sequences from the ITS region and two partitions of the 26S subunit of nuclear ribosomal DNA was used to infer phylogenetic relationships among the North American species of Phoradendron. A strongly supported clade united all but one of the species typically lacking cataphylls, a character used previously to distinguish the northern species from those of Central and South America. The divergent placement of P. californicum relative to the members of this "northern" clade confirmed the hypothesis that species lacking cataphylls are polyphyletic. Four of five species parasitic on conifers formed a well-supported clade. However, a …

A Phylogenetic Classification Of Polemoniaceae, J. Mark Porter, Leigh A. Johnson

Aliso: A Journal of Systematic and Floristic Botany

Three hundred seventy nine species of Polemoniaceae are arranged in a phylogenetic classification composed of three subfamilies, eight tribes, and 26 genera. Nomenclature of one tribe is clarified and the circumscription of several tribes differs greatly from previous classifications. Five new genera, Bryantiella, Dayia, Lathrocasis, Microgilia, and Saltugilia, are proposed. In addition, four new species are described from the genera Allophyllum, Dayia, Giliastrum, and lpomopsis. This treatment represents a major reclassification with 59 new combinations, and the application of several additional combinations not used in recent years.

Yuccas (Agavaceae) Of The International Four Corners: Southwestern Usa And Northwestern Mexico, Lee W. Lenz, Michael A. Hanson

Aliso: A Journal of Systematic and Floristic Botany

Yuccas (Yucca, Agavaceae) are an easily recognizable constituent of the vegetation of the International Four Corners; an area made up of portions of Arizona, New Mexico, Sonora and Chihuahua. We recognize three species as native to the region, Yucca baccata, Y. elata and Y. madrensis, together with interspecific hybrids, and document for the first time naturally occurring intersectional hybridization between baccate-fruited (sect. Yucca) and capsular-fruited (sect. Chaenocarpa) species. We examine the reproductive barriers to hybridization operating within the genus, i.e., spatial, temporal and ethological, and we consider circumstances that may have been responsible for the production and …

The Pseudomonas Syringae Hrp Pathogenicity Island Has A Tripartite Mosaic Structure Composed Of A Cluster Of Type Iii Secretion Genes Bounded By Exchangeable Effector And Conserved Effector Loci That Contribute To Parasitic Fitness And Pathogenicity In Plants, James R. Alfano, Amy O. Charkowski, Wen-Ling Deng, Jorge L. Badel, Tanja Petnicki- Ocwieja, Karin Van Dijk, Alan Collmer

Center for Plant Science Innovation: Faculty Publications

The plant pathogenic bacterium Pseudomonas syringae is divided into pathovars differing in host specificity, with P. syringae pv. syringae (Psy) and P. syringae pv. tomato (Pto) representing particularly divergent pathovars. P. syringae hrp/hrc genes encode a type III protein secretion system that appears to translocate Avr and Hop effector proteins into plant cells. DNA sequence analysis of the hrp/hrc regions in Psy 61, Psy B728a, and Pto DC3000 has revealed a Hrp pathogenicity island (Pai) with a tripartite mosaic structure. The hrp/hrc gene cluster is conserved in all three strains and is flanked by a unique exchangeable …

Low Temperature Tolerance For Artemisia Tridentata Seedlings Over An Elevation Gradient, Sean Patrick Redar

Theses Digitization Project

No abstract provided.

Western Tentiform Leafminer, Diane G. Alston, Michael E. Reding

All Archived Publications

Western tentiform leafminer populations can vary tremendously between years or even between generations within a single year. Increasing resistance to organophosphate insecticides and variable effectiveness of at least six parasitic wasp species that attack the leafminer can influence the population size.

Nebline, January 2000

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

Is your house healthy?
Landscaping the front yard
Humidity in home effects plants too
Amaryllis — Save that bulb for next year
Air layering tropical plants
Got the winter itches? Read this and itch some more
The giving tree
Swarming ants in the middle of winter?
Winter bubbles
Area producers planning to shift production to value-added grains
Pesticide Applicators Training
Grain check can save crop
Nebraska Conservation Trees Program
Selecting trees and shrubs
Pruning windbreak trees
Fertilizing trees
Providing water for winter birds
A safe kitchen
Healthy Eating
What to do if your power goes off: freezer/refrigerator guidelines
Focus on …

Bovine Blastocyst-Derived Trophectoderm And Endoderm Cell Cultures: Interferon Tau And Transferrin Expression As Respective In Vitro Markers, Neil C. Talbot, Thomas J. Caperna, J. Lannett Edwards, Wes Garrett, Kevin D. Wells, Alan D. Ealy

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

Continuous cultures of bovine trophectoderm (CT-1 and CT- 5) and bovine endoderm (CE-1 and CE-2) were initiated and maintained on STO feeder cells. CT-1 and CT-5 were derived from the culture of intact, 10- to 11-day in vitro-produced blastocysts. CE-1 and CE-2 were derived from the culture of immunodissected inner cell masses of 7- to 8-day in vitro-produced blastocysts. The cultures were routinely passaged by physical dissociation. Although morphologically distinct, the trophectoderm and endoderm both grew as cell sheets of polarized epithelium (dome formations) composed of approximately cuboidal cells. Both cell types, particularly the endoderm, grew on top …

Similarity And Divergence Among Viruses In The Genus Furovirus, Yukio Shirako, Nobuhiro Suzuki, Roy C. French

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

Nucleotide sequences of RNAs 1 and 2 of a Japanese strain of soil-borne wheat mosaic virus (SBWMV), the type species of the genus Furovirus, and sorghum chlorotic spot virus (SCSV) were determined from cloned cDNA. The relationship among the Japanese and US strains of SBWMV, SCSV, oat golden stripe virus (OGSV), and recently proposed Chinese wheat mosaic and European wheat mosaic viruses (CWMV and EWMV) were examined at the nucleotide and amino acid levels. Pairwise comparisons of genome-encoded proteins among the six viruses showed that the US strains of SBWMV and CWMV were the most closely related pair in RNA …

Kajian Kultur Tisu Tumbuhan Zinnia Elegans Jacq. Dan Rosa Hybrida Linn. Var. Christian Dior, Rashidi Othman

Student Works (2000-2009)

From the first experiment, it was found 1ha1 the primary root elongation of Z. elegans was optimum on the fifth day with a value of 40.82 ± 15.39 mm Thus, the root segment with an elongation in the range of25.43 to 56.21 mm has been adopted as the standard length for the m VI VO and m vt/fo cytological studies. In vivo cytological studies on Z. elegans revealed that the mitotic index (MI) measured was 13.47 ± 0.46%, the chromosome number observed was 2n = 23, the average cell and nuclear area values were 113.55 ± 4.44 μm1 and 40.58 …

Basic Biotechnology, Jennifer Flak, Julie Albrecht

Plant and Soil Sciences eLibrary

An introduction to traditional cross-breeding and genetic engineering of plants, and to biotechnology.

Objectives - Basic Biotechnology

After completing Nutrition Basic Biotechnology, participants should be able to:

• Describe one similarity between traditional cross-breeding and genetic engineering of plants.
• Give two limitations that are encountered with traditional cross-breeding of plants.
• Explain why genetic engineering is not limited in the same way as traditional cross-breeding.
• Define biotechnology in broad terms.
• List three plant applications of biotechnology.
• List the three areas of nutritional profiles that have been improved with biotechnology.

Modules:

• Lesson home
• Objectives - Basic Biotechnology
• Historical Uses of Biotechnology
• Basic Understanding …

Ec00-103 Nebraska Fall-Sown Small Grain Variety Tests 2000, Lenis Alton Nelson, David D. Baltensperger, Robert N. Klein, Roger Wesley Elmore, P. Stephen Baenziger, Todd Campbell

University of Nebraska-Lincoln Extension: Historical Materials

This circular is a progress report of variety trials conducted by personnel of the Agronomy Department and the South Central, West Central and Panhandle Research and Extension Centers and their associated agricultural laboraties. The 2000 estimated winter wheat yield for Nebraska was a 36 bushels per acre from 1,750,000 harvested acres. The total production of winter wheat for the state was 63,000,000 bushels. This circular reports data from winter wheat trials conducted throughout Nebraska. Entries included varieties or hybrids and promising experimental strains from Nebraska and surrounding states and private breeders. This was the ninetenth year for privately developed varieties. …

Index To Volumes 18 And 19

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Floristic Status Of Log Ferns (Dryopteris) In Arkansas, James H. Peck

Journal of the Arkansas Academy of Science

The fern flora of Arkansas consists of 96 taxa, including five species and three hybrids of the Log Fern genus Dryopteri This report summarizes a twenty year floristic and ecologic study of their distribution and abundance in Arkansas. Historica data are presented to review the slow accumulation of taxa reported in floras of Arkansas from early collectors to 1980 and the rapid accumulation of taxa since 1980 employing modern field techniques. Chorological data and floristic data are presented based on field, herbarium, and literature studies to correct the record and document the known localities of the eight Arkansas taxa: Dryopteris …

Characteristics Of Some Fruiting Plant Species In Northwest Arkansas, And The Avian Assemblages That Feed On Them, John W. Prather, Kimberly G. Smith, Michael A. Mlodinow, Cecilia M. Riley

Journal of the Arkansas Academy of Science

Fruits continue to be recognized as an important food source for birds in temperate areas, particularly during the fall migration period. More than 20 species of plants producing fleshy fruits are found in the Arkansas Ozarks. However, only a few of these appear to be important resources for birds during the fall migration period (August - October). Among those are sassafras (Sassafras albidum), gray-backed grape (Vitis cinerea), black cherry (Prunus serotina), hercules club (Araliaspinosa) and pokeweed (Phytolacca americana). Over the past 4 years, we have documented the physical and nutritional characteristics of those fruits and taken observational data on the …

Discovery: The Student Journal Of Dale Bumpers College Of Agricultural, Food And Life Sciences - Volume 1 2000, Several Authors

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

No abstract provided.

Parasitoids Of The Bean Leaf Beetle (Coleoptera: Chrysomelidae) Found In Nebraska Soybean Fields, Stephen D. Danielson, James R. Brandle, Laurie Hodges

Department of Agronomy and Horticulture: Faculty Publications

The bean leaf beetle, Cerotoma trifurcata (Forster) (Coleoptera: Chrysomelidae), is the major insect pest of soybean in Nebraska and throughout much of the midwestern United States. Natural enemies of the bean leaf beetle have been reported in other states, but none have been reported in Nebraska. In this study, bean leaf beetle adults were obtained by aspirating those found on soybean plants early in the season and by sweep net once plants were in the V4 stage (approximately 0.33 meter tall). Sampling was done in 1997 and 1998 in soybean fields at the University of Nebraska Agricultural Research and Development …

Behavioral Response Of Stomoxys Calcitrans (Diptera: Muscidae) To Conspecific Feces And Feces Extracts, David Carlson, Raul Alzogaray, Jerome Hogsette

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

The attraction response of Stomoxys calcitrans (L.) to its own feces was evaluated in a triple cage olfactometer. Both time- and concentration-response relationships were obtained for female S. calcitrans exposed to cellulose sponges impregnated with fresh fly feces or filter papers treated with chloroform: methanol extracts of fresh fly feces in 6-min tests. Attraction to feces collected on cellulose sponges decreased as the air flow increased. Feces collected on cellulose sponges and held for 28-31 d retained attractive activity. More female flies were attracted than males to feces on sponges or to polar solvent extracts of feces-contaminated cages. The activity …

Yields And Nitrogen Dynamics In A Rice–Wheat System Using Green Manure And Inorganic Fertilizer, Milkha S. Aulakh, Tejinder S. Khera, John W. Doran, Kuldip Singh, Bijay Singh

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

Integrating fertilizer N (FN) with legume green manures (GM) can foster sustainable and environmentally sound agricultural systems in subtropical, semiarid soils low in organic matter. A 4-yr replicated field experiment with irrigated rice (Oryza sativa L.) and wheat (Triticum aestivum L.) rotations was conducted on a sandy loam soil in the Punjab of India to evaluate the effects of incorporating cowpea (Vigna unguiculata L.) or sesbania (Sesbania aculeata L.) GM on crop productivity, N-use efficiency, and NO₃ leaching. Rice grain yields with pretransplant incorporation of 20 and 40 Mg GM ha^-1 (GM₂₀ and …