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Abstract Detail


Fauskee, Blake [1], Grusz, Amanda [2].

South of the border: Herbarium specimens from northern Mexico illuminate patterns of genotypic diversity in a wide-ranging apomictic triploid fern.

New World lip ferns (Myriopteris) are classic in their ability to circumvent sex and undergo apomictic reproduction in extreme desert environments. Obligate apomicts within Myriopteris, as with many other ferns, generate spores by way of premeiotic endomitosis, which ultimately allows odd-numbered polyploids to avoid the formation of univalents during meiosis I (e.g., 3x becomes 6x before it enters meiosis I). This also allows for genomic exchange to take place between non-sister homologues in early meiosis, as has been shown in the apomictic triploid, Myriopteris lindheimeri. Here, we consider the implications of genomic exchange for range-wide genotypic diversity of this obligate apomictic lineage. Specifically, we evaluate genotypic diversity across the southern distribution of M. lindheimeri—which is endemic to deserts of northern Mexico and the southwestern United States—using multiple nuclear microsatellite markers, and leveraging herbarium specimens for increased geographic sampling. We review our findings in light of previous estimates of genotypic diversity from across the northern half of the species range, presenting a more complete picture of range-wide genotypic diversity in this apomictic triploid fern.

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1 - University of Minnesota Duluth, 1035 Kirby Drive, Duluth, Minnesota, 55812, United States
2 - University Of Minnesota Duluth, Biology, 1035 Kirby Drive, SSB 207, Duluth, MN, 55812, United States


Presentation Type: Oral Paper
Session: 32, Pteridology III
Location: 105/Mayo Civic Center
Date: Tuesday, July 24th, 2018
Time: 2:15 PM
Number: 32002
Abstract ID:878
Candidate for Awards:Edgar T. Wherry award

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