Abstract Detail

Pteridology

Kinosian, Sylvia [1], Gompert, Zachariah [2], Wolf, Paul [3], Rowe, Carol [2], Der, Joshua [4], Schilling, Martin [5], McLenachan, Trish [6], Lockhart, Peter [7], Shepherd, Lara [8], Thomson, John [9].

Population admixture in the cosmopolitan fern genus, Pteridium (Dennstaedtiaceae).

Pteridium has been variously described as a single species with many varieties, as many distinct species, or as an assemblage of taxa between these extremes. Part of the issue plaguing the taxonomy of this genus is rampant hybridization among the various forms. This picture is further clouded by variation in ploidy and complex association of morphological characters across taxa. In this study, we examined four species of Pteridium: P. aquilinum, P. esculentum (diploids), and P. semihastatum and P. caudatum (tetraploids). With radSeq (Genotyping-by-Sequencing) data, we used the software package ENTROPY to estimate admixture proportions for these Pteridium species. Using a model based on two source populations (k = 2: hypothetically one population for each of the diploid taxa), the two tetraploid taxa appear intermediate between the two hypothesized diploid progenitors. This supports previous findings that P. semihastatum and P. caudatum are allotetraploids, each with a known and unknown progenitor. We also examined variation among subspecific taxa for P. aquilinum and P. esculentum. Further study with a larger samples size of the tetraploid taxa would be beneficial to improve the confidence of these findings, as well as potentially uncover the unknown progenitors.

1 - Utah State University, Biology, 5305 Old Main Hill, Logan, UT, 84322, USA
2 - Utah State University, Biology, 5305 Old Main Hill, Logan, UT, 84322, United States
3 - Utah State University, Department of Biology, 5305 Old Main Hill, Logan, UT, 84322, USA
4 - California State University, Fullerton
5 - University of Colorado Boulder
6 - Massey University, New Zealand
7 - Allan Wilson Centre For Molecular Ecology And Evolution, Massey University, Palmerston North, -, New Zealand
8 - Museum Of New Zealand Te Papa Tongarewa, 169 Tory St, Te Aro, Wellington, WGN, 6011, New Zealand
9 - National Herbarium of New South Wales, Australia

Keywords:
Pteridophytes
ferns
Pteridium
admixture.

Presentation Type: Oral Paper
Session: 32, Pteridology III
Location: 105/Mayo Civic Center
Date: Tuesday, July 24th, 2018
Time: 2:30 PM
Number: 32003
Abstract ID:302
Candidate for Awards:Edgar T. Wherry award