| Autor: |
Napier JD; Department of Integrative Biology, University of Texas at Austin, Austin, TX 78712., Grabowski PP; Genome Sequencing Center, HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806., Lovell JT; Genome Sequencing Center, HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806., Bonnette J; Department of Integrative Biology, University of Texas at Austin, Austin, TX 78712., Mamidi S; Genome Sequencing Center, HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806., Gomez-Hughes MJ; Department of Integrative Biology, University of Texas at Austin, Austin, TX 78712., VanWallendael A; Department of Plant Biology, Michigan State University, East Lansing, MI 48824., Weng X; Department of Integrative Biology, University of Texas at Austin, Austin, TX 78712., Handley LH; Genome Sequencing Center, HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806., Kim MK; Genome Sequencing Center, HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806., Boe AR; Department of Agronomy, Horticulture, and Plant Science, South Dakota State University, Brookings, SD 57007., Fay PA; Grassland, Soil, and Water Research Laboratory, US Department of Agriculture-Agricultural Research Service, Temple, TX 76502., Fritschi FB; Division of Plant Science and Technology, University of Missouri, Columbia, MO 65211., Jastrow JD; Environmental Science Division, Argonne National Laboratory, Lemont, IL 60439., Lloyd-Reilley J; Kika de la Garza Plant Materials Center, US Department of Agriculture-Natural Resources Conservation Service, Kingsville, TX 78363., Lowry DB; Department of Plant Biology, Michigan State University, East Lansing, MI 48824., Matamala R; Environmental Science Division, Argonne National Laboratory, Lemont, IL 60439., Mitchell RB; Wheat, Sorghum, and Forage Research Unit, US Department of Agriculture-Agricultural Research Service, Lincoln, NE 68583., Rouquette FM Jr; Texas A&M AgriLife Research and Extension Center, Texas A&M University, Overton, TX 75684., Wu Y; Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078., Webber J; Genome Sequencing Center, HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806., Jones T; Genome Sequencing Center, HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806., Barry K; Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94720., Grimwood J; Genome Sequencing Center, HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806., Schmutz J; Genome Sequencing Center, HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806.; Department of Energy Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley, CA 94720., Juenger TE; Department of Integrative Biology, University of Texas at Austin, Austin, TX 78712. |
| Abstrakt: |
Polyploidy results from whole-genome duplication and is a unique form of heritable variation with pronounced evolutionary implications. Different ploidy levels, or cytotypes, can exist within a single species, and such systems provide an opportunity to assess how ploidy variation alters phenotypic novelty, adaptability, and fitness, which can, in turn, drive the development of unique ecological niches that promote the coexistence of multiple cytotypes. Switchgrass, Panicum virgatum, is a widespread, perennial C4 grass in North America with multiple naturally occurring cytotypes, primarily tetraploids (4×) and octoploids (8×). Using a combination of genomic, quantitative genetic, landscape, and niche modeling approaches, we detect divergent levels of genetic admixture, evidence of niche differentiation, and differential environmental sensitivity between switchgrass cytotypes. Taken together, these findings support a generalist (8×)–specialist (4×) trade-off. Our results indicate that the 8× represent a unique combination of genetic variation that has allowed the expansion of switchgrass’ ecological niche and thus putatively represents a valuable breeding resource. |
