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Submissions from 2014

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Reassessment of Practical Subspecies Identifications of the USDA Daucus carota L. Germplasm Collection: Morphological Data, David M. Spooner, Mark P. Widrlechner, Kathleen R. Reitsma, Debra E. Palmquist, Slim Rouz, Zeineb Ghrabi-Gammar, Mohamed Neffati, Béchir Bouzbida, Philipp W. Simon, and Mohammed El Koudrim

Submissions from 2012

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Development of a New USDA Plant Hardiness Zone Map for the United States, Christopher Daly, Mark P. Widrlechner, Michael D. Halbleib, Joseph I. Smith, and Wayne P. Gibson

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Variation in seed dormancy in Echinochloa and the development of a standard protocol for germination testing. II: Breaking dormancy in seeds unresponsive to light or dark conditions alone by using heat and ethanol pretreatment, David A. Kovach, Mark P. Widrlechner, and David M. Brenner

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Reduction of seed dormancy in Echinacea pallida (Nutt.) Nutt. by in-dark seed selection and breeding, Luping Qu and Mark P. Widrlechner

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Dry matter and relative sugar yield from enzymatic hydrolysis of maize whole plants and cobs, Marvin P. Scott, Kenneth Byrnes, and Michael Blanco

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Scheduling Viability Tests for Seeds in Long-Term Storage Based on a Bayesian Multi-Level Model, Allan Trapp II, Philip M. Dixon, Mark P. Widrlechner, and David A. Kovach

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Horticultural Applications of a Newly Revised USDA Plant Hardiness Zone Map, Mark P. Widrlechner, Christopher Daly, Markus Keller, and Kim Kaplan

Submissions from 2011

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Inhibition of HIV-1 infection by aqueous extracts of Prunella vulgaris L., ChoonSeok Oh, Jason P. Price, Melinda A. Brindley, Mark P. Widrlechner, Luping Qu, Joe-Ann McCoy, Patricia A. Murphy, Catherine C. Hauck, and Wendy Maury

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Permeability of rosmarinic acid in Prunella vulgaris and ursolic acid in Salvia officinalis extracts across Caco-2 cell monolayers, Zhiyi Qiang, Zhong Ye, Catherine C. Hauck, Patricia A. Murphy, Joe-Ann McCoy, Mark P. Widrlechner, Manju B. Reddy, and Suzanne Hendrich

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Variation in the Breeding System of Prunella vulgaris L., Luping Qu and Mark P. Widrlechner

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Effects of Chemically Characterized Fractions from Aerial Parts of Echinacea purpurea and E. angustifolia on Myelopoiesis in Rats, Sindhura Ramasahayam, Hany N. Baraka, Fatma M. Abdel Bar, Bilal S. Abusal, Mark P. Widrlechner, Khalid A. El Sayed, and Sharon A. Meyer

Submissions from 2010

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Variation in seed dormancy in Echinochloa and the development of a standard protocol for germination testing, David A. Kovach, Mark P. Widrlechner, and David M. Brenner

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Analysis of breeding systems, ploidy, and the role of hexaploids in three Hypericum perforatum L. populations, Luping Qu, Mark P. Widrlechner, and Shawn M. Rigby

Submissions from 2009

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Hypericum in infection: Identification of anti-viral and anti-inflammatory constituents, Diane F. Birt, Mark P. Widrlechner, Kimberly D.P. Hammer, Matthew L. Hillwig, Jingqiang Wei, George A. Kraus, Patricia A. Murphy, Joe-Ann McCoy, Eve S. Wurtele, Jeffrey D. Neighbors, David F. Wiemer, Wendy J. Maury, and Jason P. Price

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Inhibition of lentivirus replication by aqueous extracts of Prunella vulgaris, Melinda A. Brindley, Mark P. Widrlechner, Joe-Ann McCoy, Patricia A. Murphy, Catherine C. Hauck, Ludmila Rizshsky, Basil J. Nikolau, and Wendy Maury

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Rosmarinic Acid in Prunella vulgaris Ethanol Extract Inhibits Lipopolysaccharide-Induced Prostaglandin E2 and Nitric Oxide in RAW 264.7 Mouse Macrophages, Nan Huang, Cathy Hauck, Man-Yu Yum, Ludmila Rizshsky, Mark P. Widrlechner, Joe-Ann McCoy, Patricia A. Murphy, Philip M. Dixon, Basil J. Nikolau, and Diane F. Birt

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Identification of light-independent inhibition of human immunodeficiency virus-1 infection through bioguided fractionation of Hypericum perforatum, Wendy Maury, Jason P. Price, Melinda A. Brindley, ChoonSeok Oh, Jeffrey D. Neighbors, David F. Wiemer, Nickolas Wills, Susan L. Carpenter, Catherine C. Hauck, Patricia A. Murphy, Mark P. Widrlechner, Kathleen Delate, Ganesh Kumar, George A. Kraus, Ludmila Rizshsky, and Basil J. Nikolau

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Cryopreservation of Dormant Buds from Diverse Fraxinus Species, Gayle M. Volk, R. Bonnart, J. Waddell, and Mark P. Widrlechner

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H. Marc Cathey, Mark P. Widrlechner

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Length and Rapid Elongation of Pedicels of the Female Flowers of Cucumis anguria L., Mark P. Widrlechner, Kathleen R. Reitsma, Lucinda D. Clark, and Joseph H. Kirkbride Jr.

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A Test of Four Models to Predict the Risk of Naturalization of Non-native Woody Plants in the Chicago Region, Mark P. Widrlechner, Janette R. Thompson, Emily J. Kapler, Kristen Kordecki, Philip M. Dixon, and Galen Gates

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Metabolic Profiling of Echinacea Genotypes and a Test of Alternative Taxonomic Treatments, Lankun Wu, Philip M. Dixon, Basil J. Nikolau, George A. Kraus, Mark P. Widrlechner, and Eve S. Wurtele

Submissions from 2008

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Phylogenetic, morphological, and chemotaxonomic incongruence in the North American endemic genus Echinacea, Lex E. Flagel, Ryan Adam Rapp, Corrinne E. Grover, Mark P. Widrlechner, Jennifer S. Hawkins, Jessie L. Grafenberg, Inés Álvarez, Gyu Young Chung, and Jonathan F. Wendel

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Assessing phenotypic, biochemical, and molecular diversity in coriander (Coriandrum sativum L.) germplasm, Pedro A. López, Mark P. Widrlechner, Philipp W. Simon, Satish Rai, Terri D. Boylston, Terry A. Isbell, Theodore B. Bailey, Candice A. Gardner, and Lester A. Wilson

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Gene banks offer breeders access to germplasm: Germplasm collections help to preserve genetic diversity, James Robbins, Mark Widrlechner, Richard Olsen, Sandra Reed, Alan Meerow, Kim Hummer, Peter Bretting, Pam Allenstein, and Mark Krautmann

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Cucumis zambianus (Cucurbitaceae), a New Species from Northwestern Zambia, Mark P. Widrlechner, Joseph H. Kirkbride Jr., Amanuel G. Ghebretinsae, and Kathleen R. Reitsma

Submissions from 2007

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Echinacea Species and Alkamides Inhibit Prostaglandin E2 Production in RAW264.7 Mouse Macrophage Cells, Carlie A. LaLone, Kimberly D.P. Hammer, Lankun Wu, Jaehood Bae, Norma Leyva, Yi Liu, Avery K.S. Solco, George A. Kraus, Patricia A. Murphy, Eve S. Wurtele, Ok-Kyung Kim, Kwon II Seo, Mark P. Widrlechner, and Diane F. Birt

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Cucurbits (Cucurbitaceae; Cucumis spp., Cucurbita spp., Citrullus spp.), Ales Lebeda, M. P. Widrlechner, J. Staub, H. Ezura, J. Zalapa, and E. Kristkova

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Genetic Diversity in Hypericum and AFLP Markers for Species-Specific Identification of H. perforatum L., Ryan J. Percifield, Jennifer S. Hawkins, Joe-Ann McCoy, Mark P. Widrlechner, and Jonathan F. Wendel

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Improving the fatty acid composition of corn oil by using germplasm introgression, Pamela J. White, Linda M. Pollak, and Susan A. Duvick

Submissions from 2006

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Liquid nitrogen controls seed-borne chalcids without reducing germination in coriander seeds, David A. Kovach, S. G. McClurg, Mark P. Widrlechner, David M. Brenner, and Candice A. Gardner

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Demand for Genetic Resources and the U.S. National Plant Germplasm System, Kelly Day Rubenstein, Melinda Smale, and Mark P. Widrlechner

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Year-and-a-Half Old, Dried Echinacea Roots Retain Cytokine-Modulating Capabilities in an in vitro Human Older Adult Model of Influenza Vaccination, David S. Senchina, Lankun Wu, Gina N. Flinn, Del N. Konopka, Joe-Ann McCoy, Mark P. Widrlechner, Eve S. Wurtele, and Marian L. Kohut

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Results of an exploration to expand the diversity of Daucus and Apiaceae germplasm collections, Mark P. Widrlechner, Kathleen R. Reitsma, and David M. Brenner

Submissions from 2005

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Commercial Seed Lots Exhibit Reduced Seed Dormancy in Comparison to Wild Seed Lots of Echinacea purpurea, Luping Qu, Xiping Wang, Ying Chen, Richard Scalzo, Mark P. Widrlechner, Jeanine M. Davis, and James F. Hancock

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Identification of QTL Controlling Thermal Properties of Maize Starch, M. P. Scott and S. A. Duvick

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Introduction to the Workshop, Mark P. Widrlechner

Submissions from 2004

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Response of Wild and Weedy Cucurbita L. to Pathotypes of Pseudoperonospora Cubensis (Berk. & Curt.) Rostov. (Cucurbit Downy Mildew), A. Lebeda and M. P. Widrlechner

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Phylogenetic Relationships among North American Popcorns and Their Evolutionary Links to Mexican and South American Popcorns, A. Santacruz-Varela, Mark P. Widrlechner, K. E. Ziegler, and P. K. Bretting

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Establishment of a new genebank for herbaceous ornamental plants, David Tay, Mark P. Widrlechner, and James L. Corfield

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Cryopreservation of Salix species using sections from winter vegetative scions, Leigh E. Towill and Mark P. Widrlechner

Submissions from 2003

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A set of Cucurbitaceae taxa for differentiation of Pseudoperonospora cubensis pathotypes, A. Lebeda and Mark P. Widrlechner

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Analysis of germplasm distribution patterns for collections held at the North Central Regional Plant Introduction Station, Ames, Iowa, USA, Mark P. Widrlechner and Lisa A. Burke

Submissions from 2002

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A Geographic Assessment of the Risk of Naturalization of Non-native Woody Plants in lowa, Mark P. Widrlechner and Jeffery K. Iles

Submissions from 2001

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Registration of GEMS-0001 Maize Germplasm Resistant to Leaf Blade, Leaf Sheath, and Collar Feeding by European Corn Borer, C. A. Abel, Linda M. Pollak, W. Salhuana, Mark P. Widrlechner, and R. L. Wilson

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Lessons From an Inventory of the Ames, Iowa, Flora (1859-2000), William R. Norris, Deborah Q. Lewis, Mark P. Widrlechner, Jimmie D. Thompson, and Richard O. Pope

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More than a Century of Change in the Ames, Iowa Flora (1859-2000), William R. Norris, Mark P. Widrlechner, Deborah Q. Lewis, Jimmie D. Thompson, and Richard O. Pope

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The Role of Environmental Analogs in Identifying Potentially Invasive Woody Plants in Iowa, Mark P. Widrlechner

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Collecting landscape trees and shrubs in Ukraine for the evaluation of aesthetic quality and adaptation in the north central United States, Mark P. Widrlechner, Robert E. Schutzki, Vasily Y. Yukhnovsky, and Victor V. Sviatetsky

Submissions from 2000

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Inheritance Studies of Aromatic Compounds in Agastache foeniculum (Pursh) Kuntze, Roger G. Fuentes-Granados, Mark P. Widrlechner, and Lester A. Wilson

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Dormancy-breaking protocols for Cuphea seed, M. P. Widrlechner and D. A. Kovach

Submissions from 1999

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Stratification and Light Improve Germination of Katsura Tree Seed, Michael S. Dosmann, Jeffery K. Iles, and Mark P. Widrlechner

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A Zone Map for Mean Annual Moisture Balance in the North Central United States, Mark P. Widrlechner

Submissions from 1998

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Amaranthus seed regeneration in plastic tents in greenhouses, David M. Brenner and Mark P. Widrlechner

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Allozyme Inheritance in Anise Hyssop [Agastache foeniculum (Pursh) Kuntze] (Lamiaceae), Roger G. Fuentes Granados, Mark P. Widrlechner, and Lester A. Wilson

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An Overview of Agastache Research, Roger G. Fuentes-Granados, Mark P. Widrlechner, and Lester A. Wilson

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Daucus and Apiaceae in the USDA germplasm collection, Kathleen R. Reitsma and Mark P. Widrlechner

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The Genus Rubus L. in Iowa, Mark P. Widrlechner

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Performance of Landscape Plants from Northern Japan in the North Central United States, Mark P. Widrlechner, James B. Hebel, Dale E. Herman, Jeffery K. Iles, Gary J. Kling, A. Paul Ovrom, John C. Pair, Ellen T. Paparozzi, Steven R. Poppe, Nancy Rose, Robert E. Schutzki, Charles Tubesing, and David K. Wildung

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Germination Reports of Uncommonly Cultivated Woody Plants from the North Central Regional Plant Introduction Station, 1984-1996, Mark P. Widrlechner and A. Paul Ovrom

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Occurrence of European Dewberry, Rubus Caesius (Rosaceae), Naturalized in Iowa and Michigan, Mark P. Widrlechner and Warren H. Wagner Jr.

Submissions from 1997

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Inheritance of Anthocyanin Production and Malate Dehydrogenase Isozymes in Agastache rugosa (Fisher & Meyer) Kuntze, Roger G. Fuentes-Granados and Mark P. Widrlechner

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Managerial tools for seed regeneration, M. P. Widrlechner

Submissions from 1996

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Hybrid Soybean Seed Production: Comparison of Three Methods, K. S. Lewis, S. K. St. Martin, Mark P. Widrlechner, R. G. Palmer, and B. R. Hedges

Submissions from 1995

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Genetic Markers and Plant Genetic Resource Management, P. K. Bretting and Mark P. Widrlechner

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Genetic Markers and Horticultural Germplasm Management, P. K. Bretting and Mark P. Widrlechner

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Characterization of Essential Oil of Dill (Anethum graveolens L.), Denys J. Charles, James E. Simon, and Mark P. Widrlechner

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Evaluation of Agastache and Other Lamiaceae Species for Reaction to Verticillium dahliae, Roger G. Fuentes-Granados and Mark P. Widrlechner

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‘Starfire’ Cuphea Hybrid, A. E. Thompson, W. W. Roath, and Mark P. Widrlechner

Submissions from 1994

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The Genus Agastache as Bee Forage: An Analysis of Reader Returns, George S. Ayers and Mark P. Widrlechner

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The Genus Agastache as Bee Forage: An Analysis of Reader Returns, George S. Ayers and Mark P. Widrlechner

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The Genus Agastache as Bee Forage: A Historical Perspective, George S. Ayres and Mark P. Widrlechner

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Evaluation of Flowering Ash in Wichita, Kansas, John C. Pair and Mark P. Widrlechner

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Variability in Cuphea viscosissima Jacq. collected in east-central United States, W. W. Roath, Mark P. Widrlechner, and R. Kleiman

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Environmental analogs in the search for stress-tolerant landscape plants, Mark P. Widrlechner

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Collecting Cuphea, Sanvitalia and Zinnia in Mexico, Mark P. Widrlechner, William W. Roath, Roger G. Fuentes-Granados, and Alvaro Campos

Submissions from 1993

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Collecting Cuphea in Brazil, Mexico and the United States, W. W. Roath, M. P. Widrlechner, and J. H. Kirkbride

Submissions from 1992

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Major essential oil constituents of Agastache spp., D. J. Charles, J. E. simon, C. Glowacki, and Mark P. Widrlechner

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Morphological and agronomic variability in Cuphea viscosissima Jacq, W. W. Roath, Mark P. Widrlechner, and R. Kleiman

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An analysis of the literature of ex situ germplasm preservation, Mark P. Widrlechner, Raymond L. Clark, William W. Roath, and Richard L. Wilson

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Performance of Landscape Plants from Yugoslavia in the North Central United States, Mark P. Widrlechner, Edward R. Hasselkus, Dale E. Herman, Jeffery K. Iles, John C. Pair, Ellen T. Paparozzi, Robert E. Schutzki, and David K. Wildung

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Biochemical evaluation of germplasm regeneration methods for cucumber, Cucumis sativus L., Mark P. Widrlechner, Larry D. Knerr, Jack E. Staub, and Kathleen R. Reitsma

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Relationships between nectar production and honey bee preference, Mark P. Widrlechner and Neil P. Senechal

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Headspace Analysis of the Volatile Oils of Agastache, Lester A. Wilson, Neil P. Senechal, and Mark P. Widrlechner

Submissions from 1991

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Characterization of Essential Oil of Agastache Species, Denys J. Charles, James E. Simon, and Mark P. Widrlechner

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Cucurbit Germplasm at the North Central Regional Plant Introduction Station, Ames, Iowa, Raymond L. Clark, Mark P. Widrlechner, Kathleen R. Reitsma, and Charles C. Block

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Rubus parvifolius (Rosaceae), naturalized in Illinois and Iowa, Mark P. Widrlechner and Richard K. Rabeler

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Pollination methods for maintaining carrot germplasm collections, R. L. Wilson, M. P. Widrlechner, and K. R. Reitsma

Submissions from 1988

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Inducing germination of dormant Cuphea seed and the effects of various induction methods on seedling survival, W. W. Roath and M. P. Widrlechner

Submissions from 1987

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GA 1565-2-4 BWT, GA 219-1-2 BWT, GA 1095-1-4 BWT, and GA 1405-1-2 BWT Bacterial Wilt-tolerant Tomato, Casimir A. Jaworski, Sharad C. Phatak, Suhas R. Ghate, Ronald D. Gitaitis, and Mark P. Widrlechner

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Variation in the Breeding System of Lycopersicon pimpinellifolium: Implications for Germplasm Maintenance, M. P. Widrlechner

Submissions from 1986

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Short Term Pollen Storage of Two Rhododendron simsii Cultivars, Mark P. Widrlechner

Submissions from 1985

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A Brief History of the North Central Regional Plant Introduction Station and a List of Genera Maintained, R. L. Wilson, R. L. Clark, and M. P. Widrlechner