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Phenotypic Variation And Genetic Purity Of The Original 'Prime-Jim®' X 'Arapaho' Population, Loren M. Luther 2017 University of Arkansas

Phenotypic Variation And Genetic Purity Of The Original 'Prime-Jim®' X 'Arapaho' Population, Loren M. Luther

Horticulture Undergraduate Honors Theses

In 2013, Castro et al., produced the first linkage map for primocane-fruiting blackberries using the cross ‘Prime-Jim®’ x ‘Arapaho.’ This mapping population has been maintained since the original experiment with the hopes of conducting future studies. Further research was determined to be needed on the population to better characterize additional phenotypic traits, and since nine years had passed since the seedlings were established, there was a need to assess the continued genetic purity of the population using molecular methods. Phenotypic data was collected to analyze the variation of the population including soluble solids content, titratable acidity, average weight, shape, and ...


Inheritance Of Carbohydrates And Fat In Crosses Of Dent And Sweet Corn, E. W. Lindstrom, Fisk Gerhardt 2017 Iowa State College

Inheritance Of Carbohydrates And Fat In Crosses Of Dent And Sweet Corn, E. W. Lindstrom, Fisk Gerhardt

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

Dent and sweet varieties of corn (maize) are sharply differentiated in the chemical constitution of their seed, especially in relative amounts of sugars, dextrins, starches and fat. This fact, together with our knowledge of the mechanism of heredity in this species, provides an excellent background for an exact. determination of the mode of inheritance of these chemical characters. Another advantage in the genetic analysis, lies in the precise, cellular mechanism of double fertilization in the embryo sac whereby the endosperm tissue is developed as the result of a triple fushion of nuclei, two from the female and one from the ...


Hereditary Correlation Of Size And Color Characteristics In Tomatoes, E. W. Lindstrom 2017 Iowa State College

Hereditary Correlation Of Size And Color Characteristics In Tomatoes, E. W. Lindstrom

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

From the hereditary standpoint, color and size characters in either plants or animals are not equally well understood. In general, the inheritance of color, technically known as a qualitative character, has been rather satisfactorily determined. On the modern chromosome theory of heredity, the genetic factors responsible for the development of colors appear to be located on the various chromosomes of the species and apparently follow a regular, stable and predictable mode of inheritance from generation to generation. Environmental agencies play a relatively minor part in ;modifying such characters. It is for this reason, perhaps, that their inheritance has been so ...


Results Of An Exploration To Expand The Diversity Of Daucus And Apiaceae Germplasm Collections, Mark P. Widrlechner, Kathleen R. Reitsma, David M. Brenner 2017 United States Department of Agriculture

Results Of An Exploration To Expand The Diversity Of Daucus And Apiaceae Germplasm Collections, Mark P. Widrlechner, Kathleen R. Reitsma, David M. Brenner

Mark P. Widrlechner

In volume 8 of this newsletter, Reitsma and Widrlechner {1998) reported on the status of Daucus and Apiaceae germplasm at the USDA-ARS North Central Regional Plant Introduction Station {NCRPIS), in Ames, Iowa. The NCRPIS is one of the primary active sites in the U.S. National Plant Germplasm System {NPGS), cons¢rving diverse collections of crop plants and their wild and weedy relatives and making them available for research and educational purposes at no cost to the user. Information about all NPGS collections can be obtained through the Germplasm Resources Information Network (GRIN) database, which can be searched via the ...


Inheritance Studies Of Aromatic Compounds In Agastache Foeniculum (Pursh) Kuntze, Roger G. Fuentes-Granados, Mark P. Widrlechner, Lester A. Wilson 2017 Iowa State University

Inheritance Studies Of Aromatic Compounds In Agastache Foeniculum (Pursh) Kuntze, Roger G. Fuentes-Granados, Mark P. Widrlechner, Lester A. Wilson

Mark P. Widrlechner

Genetic control of volatile oil production in Agastache foeniculum and, more specifically, of the production of myrcene, limonene, and methyl chavicol, three major components of its essential oils, was elucidated. Controlled crosses were made between individuals with different chemotypes, and F2 populations were analyzed for their composition of volatiles by using headspace gas chromatography. Total aromatic volatile emittance was found to be under polygenic control with additive gene effects for four of eight families studied, and each of the three major components was controlled by one to a few genes with recessive to additive effects. Evidence is also presented suggesting ...


Daucus And Apiaceae In The Usda Germplasm Collection, Kathleen R. Reitsma, Mark P. Widrlechner 2017 Iowa State University

Daucus And Apiaceae In The Usda Germplasm Collection, Kathleen R. Reitsma, Mark P. Widrlechner

Mark P. Widrlechner

The North Central Regional Plant Introduction Station (NCRPIS) is one of the primary active sites in the U. S. National Plant Gennplasm System (NPGS). Nearly all of the NPGS's collections of Apiaceae, with the exception of Apium (celery), are conserved at the NCRPIS. The NCRPIS's Apiaceae germplasm is divided for management purposes into two groups, Daucus and Umbels, as shown in Table 1 and Table 2, respectively. The NCRPIS makes these germplasm samples available for research purposes at no cost to the user. Samples can be obtained by contacting the senior author at .


Amaranthus Seed Regeneration In Plastic Tents In Greenhouses, David M. Brenner, Mark P. Widrlechner 2017 Iowa State University

Amaranthus Seed Regeneration In Plastic Tents In Greenhouses, David M. Brenner, Mark P. Widrlechner

Mark P. Widrlechner

Amaranthus germplasm is efficiently regenerated in plastic tents within greenhouses . This protocol involves the cultivation of 100-plant populations in 0.8 m2 x 1 m tall tents , and generally yields 40 000-120 000 seeds about 3 months after planting. Expsriments were performed to test the effectiveness of pollination control by isolating four monoecious Amaranthus species in these plastic tents . The estimated f requency of pollen contamination between tents was 0.01%. The estimated frequency of cross-pollination within tents was 3.9%.


Evaluation Of Flowering Ash In Wichita, Kansas, John C. Pair, Mark P. Widrlechner 2017 Kansas State University

Evaluation Of Flowering Ash In Wichita, Kansas, John C. Pair, Mark P. Widrlechner

Mark P. Widrlechner

Flowering ash (Fraxinus omus L.) is native to southern Europe and western Asia. At maturity, this ash is an oval-headed tree with glossy, dark green leaves, which grows to about 50 feet (15 meters) tall. Its most notable feature appears in May: showy panicles of fragrant, cream-colored flowers, which help make this species a popular street and park tree in those regions where it is winter hardy. Dirr (1983) notes that it is hardy to -10°F (- 230C) and, similarly, it is listed for USDA Hardiness Zone 6 in Hortus Third (1976). A seedling population of flowering ash, PI 385252 ...


Establishment Of A New Genebank For Herbaceous Ornamental Plants, David Tay, Mark P. Widrlechner, James L. Corfield 2017 The Ohio State University

Establishment Of A New Genebank For Herbaceous Ornamental Plants, David Tay, Mark P. Widrlechner, James L. Corfield

Mark P. Widrlechner

This paper summarizes the establishment and development of the new Ornamental Plant Germplasm Center (OPGC) of the US National Plant Germplasm System (NPGS), its initial accomplishments, and future plans. We recount its genesis from a concept to the signing of a Special Cooperative Agreement (SCA) in 1999 between the United States Department of Agriculture (USDA) and The Ohio State University (OSU). The roles of the NPGS Herbaceous Ornamental Crop Germplasm Committee (HOCGC), the creation of an OPGC Ad-hoc Advisory Committee in shaping the foundation of the OPGC leading to the appointment of an interim centre programme director, and the employment ...


Inducing Germination Of Dormant Cuphea Seed And The Effects Of Various Induction Methods On Seedling Survival, W. W. Roath, M. P. Widrlechner 2017 Iowa State University

Inducing Germination Of Dormant Cuphea Seed And The Effects Of Various Induction Methods On Seedling Survival, W. W. Roath, M. P. Widrlechner

Mark P. Widrlechner

Cuphea wrightii Gray, and C. laminuligera Koehne are potential domestic sources of medium-chain-length fatty acids. These species have many undesirable characters including post harvest dormancy in which seeds remain dormant for one year or more. Researchers have shown that common techniques to induce germination in these species are not effective. Seed lots from these species were produced in 1983 and 1986. Excised seed (seed coats removed) and nonexcised seed (seed coats intact) were germinated on unsupplemented agar medium and on paper germination towels. No germination was obtained from nonexcised 1986 C. wrightii seed. Germination of I% or less was obtained ...


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, Victor V. Sviatetsky 2017 United States Department of Agriculture

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, Victor V. Sviatetsky

Mark P. Widrlechner

Past experiences with long-term evaluations of woody landscape plants from Slovenia, Croatia, and Bosnia- Herzegovina in the north central United States indicated that a relatively low proportion of these introductions were well adapted to climatic and soil conditions. Based on these results, criteria were developed to focus future exploration for landscape trees and shrubs from more analogous environments in eastern and central Europe. Application of these criteria identified the forest– steppe transition zone in the northern half of Ukraine as a region with great potential, because of similarities to the north central United States in climatic extremes, soil types and ...


The Genus Agastache As Bee Forage: A Historical Perspective, George S. Ayres, Mark P. Widrlechner 2017 Michigan State University

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

Mark P. Widrlechner

The September 1992 and January 1993 "The Other Side of Beekeeping" requested reader input about experiences with anise hyssop. This series of articles is our response to your replies. Most who made plantings were disappointed, yet historically, very competent apiculturists thought very highly of anise hyssop. In addition, our experiences with this plant and several closely related species make us ponder why the responses were not more positive. In this article, we review the history and biology of the genus Agastache as a bee forage. In the second article of the series, we will use this information to speculate on ...


Response Of Wild And Weedy Cucurbita L. To Pathotypes Of Pseudoperonospora Cubensis (Berk. & Curt.) Rostov. (Cucurbit Downy Mildew), A. Lebeda, M. P. Widrlechner 2017 Palacký University

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

Mark P. Widrlechner

The genus Cucurbita includes ca 14 species native to the New World from the United States south to Argentina. It includes at least five different species domesticated before European contact (Sanjur et al., 2002). In many parts of the world, these domesticated species are widely cultivated as vegetables and, to a lesser extent, as oilseeds, animal forages, and ornamentals. Wild populations of Cucurbita often possess disease-resistance genes that are unknown or extremely rare in domesticated populations. This has been demonstrated for resistance to many viruses and fungal pathogens that infect Cucurbita (Rhodes, 1964; Provvidenti, 1990; McCreight and Kishaba, 1991; Munger ...


Relationships Between Nectar Production And Honey Bee Preference, Mark P. Widrlechner, Neil P. Senechal 2017 United States Department of Agricuture

Relationships Between Nectar Production And Honey Bee Preference, Mark P. Widrlechner, Neil P. Senechal

Mark P. Widrlechner

A 1989 review of research related to the improvement of nectar production in plants by Shuel presents evidence in support of intentional selection of plant genotypes for better nectar production. Such superior genotypes could be of great benefit for both beekeepers and other agricultural producers.


Stratification And Light Improve Germination Of Katsura Tree Seed, Michael S. Dosmann, Jeffery K. Iles, Mark P. Widrlechner 2017 Iowa State University

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

Mark P. Widrlechner

Germinability of two, half-sib seed sources of Cercidiphyllum japonicum Sieb. & Zucc. and one seed source of Cercidiphyllum magnificum (Nakai) Nakai was determined after not stratifying or stratifying seeds at 3.5 ± 0.5 °C (38.3 ± 0.9 °F) for 8 days followed by germination for 21 days at 25 °C (77 °F) in darkness or under a 15-hour photoperiod. Stratification was not required for germination, but increased germination percentage, peak value, and germination value for both species. Stratification increased germination of C. japonicum from 42% to 75%, and germination of C. magnificum from 12% to 24%. Light enhanced germination ...


Identifying Genetic Markers And Their Role In Selecting Chemotypes In Perennial Lamiaceae, Roger G. Fuentes-Granados, Lester A. Wilson, Mark P. Widrlechner 2017 Iowa State University

Identifying Genetic Markers And Their Role In Selecting Chemotypes In Perennial Lamiaceae, Roger G. Fuentes-Granados, Lester A. Wilson, Mark P. Widrlechner

Mark P. Widrlechner

This is a report of research progress in this project through early 1995. The results of these initial experiments have led us to propose hypotheses about the patterns of inheritance of aromatic compounds in Agastache foeniculum. We are now testing those hypotheses with larger plant populations. On request, we will be pleased to provide readers with more up-to-date information as we complete the analyses of our ongoing experiments. Until such results are subject to scientific peer review, the data presented in the following report must be considered strictly preliminary.


Germination Reports Of Uncommonly Cultivated Woody Plants From The North Central Regional Plant Introduction Station, 1984-1996, Mark P. Widrlechner, A. Paul Ovrom 2017 Iowa State University

Germination Reports Of Uncommonly Cultivated Woody Plants From The North Central Regional Plant Introduction Station, 1984-1996, Mark P. Widrlechner, A. Paul Ovrom

Mark P. Widrlechner

The North Central Regional Plant Introduction Station's curatorial responsibilities as part of the U.S. National Plant Germplasm System (White et al., 1989) and our coordination of the NC-7 Regional Ornamental Plant Trials (Widrlechner, 1990) have led us to germinate seeds of many unusual woody plants. Attempts to germinate these seeds have been documented since 1984. Many of these records are routine and duplicate information found in widely available references. However, we have successfully germinated the seeds of some species for which little is known about their germination requirements, or such information is absent from standard compendia. This report ...


Inheritance Of Anthocyanin Production And Malate Dehydrogenase Isozymes In Agastache Rugosa (Fisher & Meyer) Kuntze, Roger G. Fuentes-Granados, Mark P. Widrlechner 2017 Iowa State University

Inheritance Of Anthocyanin Production And Malate Dehydrogenase Isozymes In Agastache Rugosa (Fisher & Meyer) Kuntze, Roger G. Fuentes-Granados, Mark P. Widrlechner

Mark P. Widrlechner

This study was conducted to determine the inheritance of anthocyanin production and of malate dehydrogenase banding patterns in Agastache rugosa. Results of the study support the hypothesis that anthocyanin production is controlled by a single dominant gene, designated as A, for anthocyanin production. The Mdh-3 banding patterns are controlled by two alleles, each of which associated with a two-banded phenotype. A monomeric quaternary structure of MDH, which is rather atypical among plant species, can be inferred from the results. No linkage was found between the loci governing anthocyanin production and Mdh-3 banding patterns. This is the first report of heritable ...


Photosynthesis And Shoot Health Of Five Birch And Four Alder Taxa After Drought And Flooding, William R. Graves, Mark A. Kroggel, Mark P. Widrlechner 2017 Iowa State University

Photosynthesis And Shoot Health Of Five Birch And Four Alder Taxa After Drought And Flooding, William R. Graves, Mark A. Kroggel, Mark P. Widrlechner

Mark P. Widrlechner

Selection of under-used taxa of birches (Betula L.) and alders (Alnus Miller) for use in managed landscapes can be guided by information on their responses to moisture extremes in the root zone. Our objective was to compare the photosynthesis, leaf surface area, and subjective health ratings of eight relatively obscure birches and alders when treated with drought and flooding in a greenhouse. We also treated ‘Whitespire Sr.’ birch (Betula populifolia) to demonstrate responses of a cultivar common in the nursery trade. Plants used as controls were irrigated daily, whereas pots of flooded plants were immersed. All water was withheld from ...


Managerial Tools For Seed Regeneration, M. P. Widrlechner 2017 United States Department of Agriculture

Managerial Tools For Seed Regeneration, M. P. Widrlechner

Mark P. Widrlechner

This report reviews some tools that curators of ex situ plant germplasm collections can employ to manage seed regeneration. It examines the various roles of germplasm users as sources of technical expertise and advice about germplasm needs. Analysis of past demand for germplasm and forecasts of future demand trends are valuable guides to plan regeneration. Seed quantity and viability are key planning criteria, but regeneration planning should also weigh such factors as overall genetic diversity within collections, institutional duplication, and the relative quality and completeness of passport and characterization data. The North Central Regional Plant Introduction Station conducts applied research ...


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