UMD Theses and Dissertations

Permanent URI for this collectionhttp://hdl.handle.net/1903/3

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a given thesis/dissertation in DRUM.

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Author: search.filters.author.Schlag, Erin MargaretSubject: search.filters.subject.genetic diversity

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    Genetic Diversity and Phytochemistry of Maryland-Grown American Ginseng (Panax quinquefolius L.)
    (2004-09-16) Schlag, Erin Margaret; McIntosh, Marla S; Marine-Estuarine-Environmental Sciences; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    American ginseng (Panax quinquefolius) is a valuable medicinal herb threatened by over-harvest. Because data are insufficient, current attempts to protect diversity and improve cultivation are inadequate. Random Amplified Polymorphic DNA (RAPD) markers were used to estimate genetic diversity and high-performance liquid chromatography (HPLC) was used to characterize root ginsenoside concentrations in wild and cultivated populations of American ginseng in Maryland. Wild populations were less diverse than cultivated and highly differentiated from one another; suggesting that drift was high and gene flow low in wild populations. Exotic plants were genetically and phytochemically distinct from native plants. The main ginsenoside in exotic plants was Re versus Rg1 in native plants. Plants from at least one wild population were genetically and phytochemically similar to exotic plants, suggesting that exotic plants were introduced into wild populations. Thus, native Maryland American ginseng is unique but threatened by drift, isolation and artificial introductions.