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A Survey Of The Vascular Flora Of Black Hawk County, Iowa, Karen E. Van Norman

Dissertations and Theses @ UNI

Black Hawk County, located in the east-central part of the state of Iowa, is a political subdivision of 570 square miles. The topography of the county is the result of glaciation, erosion and deposition, causing gently rolling plains. The Cedar and the Wapsipinicon rivers transect the county from the northeast to the southwest. With their tributaries, these rivers comprise a natural drainage network which has enhanced agricultural practices throughout the county.

The vascular flora of the county was surveyed in the field during the growing seasons of 1982 and 1983. Over 1500 voucher specimens were collected. Data were also compiled …

The Characteristics And Phytogeographic Affinities Of The Flora Of Nine-Mile Prairie, A Western Tall-Grass Prairie In Nebraska, Robert B. Kaul, Steven B. Rolfsmeier

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Three hundred ninety-two species, subspecies, and varieties have been recorded at Nine-Mile Prairie, a relict tall-grass prairie that has been reduced from 323 to 97 ha in the past 50 years. There are 218 native and 17 introduced herbaceous perennial species, and 73 native and 24 introduced annuals. Analogous numbers for biennials are 15 and 11, for shrubs are 14 and one, for trees are ten and three, and for woody vines are six and none. One hundred twenty-one native species are of central and eastern North American phytogeographic affinity, and 109 are of transcontinental affinity. Seventy-nine of the Prairie's …

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

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

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.

Molecular Cloning Of Spinach Chloroplast Dna Isolated By Alkaline Lysis, Robert Gray Drager

Dissertations and Theses

Chloroplast genomes of land plants show conservation of structure and gene arrangement. The spinach chloroplast genome is comprised of a covalently closed. circular DNA molecule of 150 kilobases and is typical of these plants. Approximately 20% of the proteins found in the spinach chloroplast are encoded by the chloroplast genome and translated on chloroplast ribosomes. The remainder are encoded on chromosomes in the nucleus, translated on cytoplasmic ribosomes and transported into the chloroplast.

Spinach chloroplast DNA was isolated from crude 2 chloroplast preparations by a new method. Chloroplasts were lysed with alkaline sodium dodecyl sulfate, contaminating macromolecules precipitated with acidified …

Sfa Gardens Newsletter, Dec 1986, Sfa Gardens, Stephen F. Austin State University

SFA Gardens Newsletters

No abstract provided.

Full Issue, Vol. 10

Great Basin Naturalist Memoirs

No abstract provided.

Uptake Of Nitrogen From Soil, Fertilizer, And Crop Residues By No-Till Corn And Soybean, J. F. Power, John W. Doran, Wallace Wilhelm

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

The relative availability of nitrogen (N) from indigenous soil organic N, immobilized fertilizer N, currently applied fertilizer N, and crop residues is largely unknown. A non-irrigated experiment was conducted on a silty clay loam at Lincoln, NE, with both continuous soybean [Glycine max (L.) Merr.] and corn (Zea mays L.), in which crops were produced with no tillage after surface application of 0, 0.5,1.0, or 1.5 times the quantity of aboveground crop residue produced the previous year. In 1980 and 1981, depleted ¹⁵N NH₄NO₃ (at 45 kg N ha^-1) and crop residues …

Crop Residue Effects On Soil Environment And Dryland Maize And Soya Bean Production, J. F. Power, Wallace Wilhelm, J. W. Doran

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

The research reported here provides data on the effects of crop residues on the surface of no-till soil upon the soil environment and resulting biological activity, including crop growth. For maize (Zea mays L.) and soya bean [Glycine max (L.) Merr.] production in eastern Nebraska, U.S.A. (4 years of data), increasing crop residue rate decreased maximum soil temperatures at the soil surface by at least 5°C, and generally increased soil water storage by at least 50 mm. Availability and uptake of nitrogen from the soil organic matter and applied fertilizers (and for soya bean from decomposition of crop …

Paul Alan Cox And Joel C. Janetski's Review Of Patrick Vinton Kirch's The Evolution Of The Polynesian Chiefdoms, Paul Alan Cox, Joel C. Janetski

Pacific Studies

No abstract provided.

The Effect Of Pre-Sterile Medium Ph Photoperiod And N6-(2-Isopentenyl)-Adenine (2ip) On Shoot Production During Stage Ii Micropropagation Of Rhododendrons, Lori Longo Smith

Biological Sciences Theses & Dissertations

The number of shoots produced during a six week subculture of two Rhododendron sp., cultivars Rocket and Gibraltar was the same for both 16 and 24 hour photoperiods under cool white fluorescent lights, whereas significantly fewer shoots were produced under a 10 hour photoperiod for ‘Rocket.' Increasing concentrations of N₆- (2-isopentenyl)- adenine (2iP) from 0 to 32 μMin Anderson's medium resulted in proportional increases in shoot number. When shoots were cultured in the presence of indole-3-acetic acid (IAA) and 2iP, shoot multiplication was increased significantly over shoots cultured with 2iF alone. No interaction affecting shoot multiplication was …

The Pollen Exostructure Of Striga (Scrophulariaceae), Mark A. Deleonardis

Biological Sciences Theses & Dissertations

In this survey, the pollen exostructure of 13 Striga species was examined using light microscopy and scanning electron microscopy. Two of the 13 species were also observed by transmission electron microscopy to assess major differences in exine composition. Striga pollen is consistently spherical to oblate, isopolar, tectate, and three or four colpate. Sculpturing may be psilate, psilate-perforate, finely rugulate, or coarsely rugulate. The equatorial width of the species surveyed ranged from 15 to 30 micrometers. It is concluded that variation in Striga pollen sculpturing, aperture structure, and size support the current taxonomy of the genus.

Differential Effects Of Lithium Chloride On In Vitro Growth Of Clavibacter Michiganense Subsp. Nebraskense Depending Upon Inoculum Source, Mary L. Smidt, Anne K. Vidaver

Department of Plant Pathology: Faculty Publications

The bacterium Clavibacter michiganense subsp. nebraskense (Corynebacterium michiganense subsp. nebraskense) was grown in broth cultures and inoculated into corn plants. The plating efficiency of cells from broth cultures was essentially the same on nutrient broth-yeast extract and the semiselective medium for this bacterium, CNS. However, when cells were isolated from Goss bacterial wilt- and blight-infected corn, very few were recovered on CNS compared with the amount recovered on nutrient broth-yeast extract agar. When lithium chloride was omitted from the CNS, recoveries from infected corn were nearly the same as on nutrient broth-yeast extract agar. No other ingredient of CNS …

Early Successional Plant Communities On An Abandoned Strip Mine In Butler County, Kentucky, Ralph Reiss

Masters Theses & Specialist Projects

Plant growth and development during the growing season of 1985 were examined on a strip mine located in Butler County, Kentucky, abandoned in 1963. Analysis included field plot measures of the frequency, density, and percent cover of the established plant species and determination of biomass accumulation during the 1985 year. Experimental subplots were established in both field and laboratory settings and the growth of the herbaceous colonizers compared under natural and programmed growth chamber conditions. Microclimatic measures of temperature and solar insolation were conducted in the field along with soil texture and pH measures. Results indicate that in the early …

A Review Of Deep Tillage Research In Western Australia, M W. Perry

Division of Plant Research : Technical Report Series

A history of deep tillage in Western Australia, R.J. Jarvis. Biology of root growth in cereals, M.W. Perry. Physics of soil compaction and root grow thin compacted media, A.P. Hamblin. Effects of deep tillage on root growth and wateruse of wheat and lupins, D. Tennant. Nutrition or water - why the response to ripping, W.J. Bowden. Crop response to deep tillage, R.J. Jarvis. Response of crops and pastures to deep tillage, C. Henderson. Soil compaction, deep tillage and root disease, J. Wilson. Deep tillage in farming systems: timing of deep tillage and interactions with rotation and conventional tillage practice, J. …

Abatement Of Nitrate Pollution In Groundwater And Surface Runoff From Cropland Using Legume Cover Crops With No-Till Corn, M. Scott Smith, Jac J. Varco

KWRRI Research Reports

Agricultural practices can have a significant impact on water quality. The effects of leguminous winter cover crops on leaching of NO^-₃; from soil have been investigated in this project. Legume cover crops, by fixation of atmospheric N, can reduce the amount of fertilizer N required to produce summer grain crops. The methods initially used to evaluate cover crop effects on No; transport included suction probe lysimeters and measurement of NO^-₃; in soil samples collected to a depth of 90 cm. These measurements demonstrated extreme spatial variability in NO^-₃; distribution and water …

The Prairie Naturalist Volume 18, No. 2. June 1986

The Prairie Naturalist

Paul B. Kannowski, Editor

Nikki R. Seabloom, Assistant Editor

Douglas H. Johnson, Book Review Editor

TABLE OF CONTENTS

WINTER ECOLOGY OF BALD EAGLES IN SOUTHCENTRAL NEBRASKA ▪ G. R. Lingle and G. L. Krapu

NATURAL HISTORY OF THE PLAINS POCKET MOUSE IN AGRICULTURALLY DISTURBED SANDSAGE PRAIRIE ▪ K. M. Reed and J. R. Choate

COMMERCIAL SUNFLOWERS: FOOD FOR RED FOXES IN NORTH DAKOTA ▪ A. B. Sargeant, S. H. Allen, and J. P. Fleskes

CHRISTMAS BIRD COUNTS FOR NORTH DAKOTA - 1985 ▪ R. N. Randall

NEST SITES OF DUCKS IN GRAZED MIXED-GRASS PRAIRIE IN NORTH DAKOTA ▪ H. F. …

Restriction Endonuclease Activity Induced By Pbcv-1 Virus Infection Of A Chlorella-Like Green Alga, Yuannan Xia, Dwight Burbank, Lothar Uher

Department of Plant Pathology: Faculty Publications

An enzyme was isolated from a eucaryotic, Chlorella-like green alga infected with the virus PBCV-1 which exhibits type I1 restriction endonuclease activity. The enzyme recognized the sequence GATC and cleaved DNA 5' to the G. Methylation of deoxyadenosine in the GATC sequence inhibited enzyme activity. In vitro the enzyme cleaved host Chlorella nuclear DNA but not viral DNA because host DNA contains GATC and PBCV-1 DNA contains GmATC sequences. PBCV-1 DNA is probably methylated in vivo by the PBCV-1-induced methyltransferase described elsewhere (Y. Xia and J. L. Van Etten, Mol. Cell. Biol. 6:144-1445). Restriction endonuclease activity was first detected …

Descriptive Ethology And Activity Patterns Of Black-Footed Ferrets, Tim W. Clark, Louise Richardson, Steven C. Forrest, Denise E. Casey, Thomas M. Campbell Iii

Great Basin Naturalist Memoirs

Aspects of the aboveground ethology and activity patterns of the black-footed ferrets (Mustela nigipes) are described for a population in northwestern Wyoming as a first step in building a descriptive ethogram and quantification of activity patterns. We observed at least 237 individual ferrets for 208 hr on 441 occasions from 2 December 1981 through 25 September 1984. Mainenance behaviors (locomotion, alert, grooming, and sunning, defecation and urination, digging, and predation) and social behavior (reproduction, ontogeny, maternal, play, agonistic) are described as well as some ferret-human interactions. Ferret vocalizations are subjectively described. We located ferrets during most months including …

Description And History Of The Meeteetse Black-Footed Ferret Environment, Tim W. Clark, Steven C. Forrest, Louise Richardson, Denise E. Casey, Thomas M. Campbell Iii

Great Basin Naturalist Memoirs

The black-footed ferret (Mustela nigripes) occupied area lies in the western Big Horn Basin, Park County, Wyoming. Cody, a nearby town, shows a record high temperature of 40.5 C and a low of -43.3 C, with 173 days each year below 0 C. Area geology is dominated by Absaroka volcanics. Soils are shallow (0.5 m) and underlain by unconsolidated gravels; well-drained, medium-textured clay-loams (ca 1 m in depth); or clays derived from shale parent materials. Vegetation is characterized by a wheatgrass-needlegrass shrubsteppe type (Agropyron/Stipa/Artemisia). Prior to white settlement, the area hosted a diverse large mammal community. …

Dna Methyltransferase Induced By Pbcv-1 Virus Infection Of A Chlorella-Like Green Alga, Yuannan Xia, James L. Van Etten

Department of Plant Pathology: Faculty Publications

A DNA methyltransferase was isolated from a eucaryotic, Chlorella-like green alga infected with the virus PBCV-1. The enzyme recognized the sequence GATC and methylated deoxyadenosine solely in GATC sequences. Host DNA, which contains GATC sequences, but not PBCV-1 DNA, which contains GmATC sequences, was a good substrate for the enzyme in vitro. The DNA methyltransferase activity was first detected about 1 h after viral infection; PBCV-1 DNA synthesis and host DNA degradation also began at about this time. The appearance of the DNA methyltransferase activity required de novo protein synthesis, and the enzyme was probably virus encoded. Methylation of …

Restriction Endonuclease Activity Induced By Pbcv-1 Virus Infection Of A Chlorella-Like Green Alga, Yuannan Xia, Dwight Burbank, Lothar Uher, Dietrmar Rabussay, James L. Van Etten

Department of Plant Pathology: Faculty Publications

An enzyme was isolated from a eucaryotic, Chlorella-lie green alga infected with the virus PBCV-1 which exhibits type II restriction endonuclease activity. The enzyme recognized the sequence GATC and cleaved DNA 5' to the G. Methylation of deoxyadenosine in the GATC sequence inhibited enzyme activity. In vitro the enzyme cleaved host Chlorella nuclear DNA but not viral DNA because host DNA contains GATC and PBCV-1 DNA contains G^mATC sequences. PBCV-1 DNA is probably methylated in vivo by the PBCV-1-induced methyltransferase described elsewhere (Y. Xia and J. L. Van Etten, Mol. Cell. Biol. 6:1440-1445). Restriction endonuclease activity was …

Esenbeckia Berlandieri (Rutaceae) Rediscovered In Extreme Southern Texas, Michael R. Heep, Robert I. Lonard

School of Integrative Biological & Chemical Sciences (Formerly Dept. of Biology)

No abstract provided.

Calcium Amelioration Of Salinity (Sodicity) On Nitrogen Fixation, Stomatal Resistance, Potassium/Sodium Ratio And Total Nitrogen Of Phaseolus Vulgaris L., Mahmood Akhavan-Kharazian

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Extreme salinity is one of the most common environmental constraints with which legume/rhizobia symbionts must deal in arid and semi-arid regions of the world. In some areas, with good management, it has been economically possible to ameliorate the saline soil with calcium. The objective of this study, therefore, was to investigate calcium amelioration of salinity (sodicity) on nitrogen fixation, stomatal resistance, potassium/sodium ratio, and total nitrogen of Phaseolus vulgaris L. Seeds of snapbeans were grown in pots under green house conditions and were irrigated with NaCl concentrations of 0, 0.4, 0.8 or 1.2 S m^-1 combined with CaS0_{4 …}

Hormonal Control Of Phloem Loading In Celery (Apium Graveolens L.), Mark Watts

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Previous research has indicated that phloem loading may be regulated by plant growth regulators. This conclusion, however, is based on circumstantial evidence in that previous experiments implemented complex tissue such as leaf discs or petioles to simulate phloem loading. Celery is a favorable system to measure phloem loading because it utilizes pure vascular tissue and/or isolated phloem tissue. Pure phloem tissue has not been used to date in phloem loading research.

It was demonstrated that the plant growth regulators gibberellic acid (GA₃) and indole acetic acid (IAA) caused an enhancement of sucrose-loading in vascular bundles and in isolated …

Organic Matter Budgets And Models For Four Plant Communities In The Great Dismal Swamp, J. Patrick Megonigal

Biological Sciences Theses & Dissertations

Budgets and models of organic matter dynamics were developed for one mesic and three seasonally flooded plant communities in the Dismal Swamp. Components included aboveground parts, belowground parts, litter and soil organic matter (SOM).

Net primary- production was significantly greater on them flooded sites. Comparisons show that the Dismal Swamp is highly productive despite relatively low nutrient inputs.

Budget calculations showed that over 65% of the total input to SOM comes from roots. Leaves contributed about 70% of the aboveground inputs.

The model predicted that species composition, aboveground biomass and turnover rates on the cedar site will become quite similar …

Research Note: Do Mushrooms Have A Sex Life?, Diane Cope Peabody, Robert B. Peabody

Bridgewater Review

No abstract provided.

Sfa Gardens Newsletter, April 1986, Sfa Gardens, Stephen F. Austin State University

SFA Gardens Newsletters

No abstract provided.

Development And Validation Of A Dynamic Model Of Growth And Quality For Cool Season Grasses, W. F. Brown, Lowell E. Moser, Terry J. Klopfenstein

Department of Agronomy and Horticulture: Faculty Publications

A daily time step model simulating growth and quality of cool season grasses was developed and validated for smooth brome (Bromus inermis Leyss.) under varying environmental and management conditions. Growth predictions are based upon genetic potential, environmental temperature, leaf area, soil moisture, and nitrogen fertilization rate. Daily potential growth rate is a composite of two functions—one relating grass species maximum growth rate to minimum, optimum, and maximum temperatures for plant growth, and another relating daily minimum and maximum air temperatures to time. Multipliers are developed for available leaf area, moisture, and nitrogen, and the minimum of these values modifies …

The Prairie Naturalist Volume 18, No. 1. March 1986

The Prairie Naturalist

Paul B. Kannowski, Editor

Nikki R. Seabloom, Assistant Editor

Douglas H. Johnson, Book Review Editor

TABLE OF CONTENTS

INVASION PATTERN MAPPING OF NON-SEEDED SPECIES ON A SHALLOWLY DISTURBED SEEDED SITE ▪ C. E. Grygiel, C. D. Bonham, and E. F. Redente

CHANGES IN THE LICHEN FLORA OF PIPESTONE NATIONAL MONUMENT, MINNESOTA ▪ G. D. Willson and T. W. Vinyard

INTERPOPULATION VARIABILITY IN MOUTHPARTS IN Scaphiopus bombifrons IN NEBRASKA (AMPHIBIA: PELOBATIDAE) ▪ T. L. Potthoff and J. D. Lynch

PLANTS AND INVERTEBRATES IN A PRAIRIE WETLAND DURING DUCK BROOD-REARING J. W. McCrady, W. A. Wentz, and R. L. Linder

OCCURRENCE OF …

The Prairie Naturalist Volume 18, No. 3 September 1986

The Prairie Naturalist

Paul B. Kannowski, Editor

Nikki R. Seabloom, Assistant Editor

Douglas H. Johnson, Book Review Editor

TABLE OF CONTENTS

HABITAT SELECTION AND MOVEMENT PATTERNS IN SANDHILLS RODENTS ▪ C. A. Lemen and P. W. Freeman

THE HERPETOFAUNA OF THE WEAVER DUNES, WABASHA COUNTY, MINNESOTA ▪ P. A. Cochran

MULTIPLE EGG CLUTCH PRODUCTION IN THE GREAT PLAINS TOAD ▪ J. J. Krupa

MAMMALS OF THE KONZA PRAIRIE RESEARCH NATURAL AREA, KANSAS ▪ E. J. Finck, D. W. Kaufman, G. A. Kaufman, S. K. Gurtz, B. K. Clark, L. J. McLellan, and B. S. Clark

AQUATIC INVERTEBRATES IN LEVEL DITCHES AND ADJACENT EMERGENT …