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Browsing by Author "Gross, Briana"

Now showing 1 - 4 of 4
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    Dataset supporting Domestication during restoration: Unintentional selection during eight generations of wild seed propagation reduces herkogamy, dichogamy, and heterozygosity in Clarkia pulchella
    (2024-08-29) Etterson, Julie; Fliehr, Paige; Pizza, Riley; Gross, Briana; jetterso@d.umn.edu; Etterson, Julie; Etterson & Gross labs, University of Minnesota Duluth
    Seed production on native seed farms has increased to meet the rising demand for plant material for restoration. However, few studies have tested whether cultivation of wild populations imposes selection and elicits evolutionary change that aligns with process of crop domestication, and those that have report mixed results. Here we show that eight generations of propagation resulted in floral and genomic change in Clarkia pulchella Pursh (Onagraceae) compared to the wild source populations. Both herkogamy and dichogamy i.e., the physical and temporal separation of male and female flower parts, respectively) were significantly decreased between cultivated and wild populations. To determine if these changes resulted in the loss of heterozygosity and overall levels of genetic diversity, we examined >6,500 SNPs derived from RAD-seq data from 46 wild and 47 farmed samples. We show that mean and median heterozygosity of the farmed samples was 81.7% and 61.9% less than that of the wild samples, respectively. This was strongly driven by a loss of alleles, resulting in more than double the number of SNPs with a heterozygosity of zero. This reduction in genetic diversity was significant whether the farmed samples were compared to the pooled wild samples or to a single population. This suggests cultivation of wild populations may be having similar effects to the early stages of crop domestication. We discuss these results in the context of native seed farming and measures that can retain the genetic integrity of wild population during the process of seed increase for restoration. (Genomic data stored in GenBank)
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    "Diversity, diversification, and the genomic basis of evolution in perennial crops and their wild relatives", a Seminar by Dr. Allison Miller Assoc. Professor, Saint Louis University (2014-04-11)
    (2014) Miller, Allison; Gross, Briana; University of Minnesota Duluth. Department of Biology
    The long-term goals of my research are to advance understanding of perennial plant evolution to better inform sustainable agriculture, crop improvement, and the conservation of plant genomic resources.
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    Microsatellite data for modern and historical lingonberry in northeastern Minnesota
    (2021-04-29) Gross, Briana; blgross@d.umn.edu; Gross, Briana; Gross Lab, Biology Department, University of Minnesota Duluth
    Partially clonal species are subject to the same evolutionary forces experienced by obligately sexual species, but the variety of potential responses at the population level is much more diverse, ranging from inbreeding to a loss of sexual reproduction. These responses have different genetic outcomes and can interact with each other and other species-level characteristics, such as dispersal and lifespan, to influence the genotypic and genetic diversity of populations through time and across a species range. In this study, we compared the historical and modern population genetics of Vaccinium vitis-idaea (lingonberry) samples from a warm range edge region of the species’ circumboreal distribution. Using 18 polymorphic microsatellite loci in 261 historical and modern samples, we answered three questions: 1) Has genetic diversity been lost through the last six decades?, 2) Do modern populations show signs isolation or low differentiation?, and 3) What are the genotypic and genetic signals of clonality in modern populations? Lingonberry currently appears to be genetically robust at a warm range edge. This study also reveals the variety of reproductive strategies a partially clonal species and can display within a small area, and lays the groundwork for long-term monitoring of geographically proximate populations with vastly different levels of clonal vs. sexual reproduction in region experiencing significant warming.
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    Trypanosome gene regulation: an RNA-centric perspective (2014-09-05)
    (2014) Zimmer, Sara L; Gross, Briana
    UMD Medical School speaker Dr. Sara L. Zimmer lecture Trypanosome gene regulation: an RNA-centric perspective