Abstract Detail



Systematics

Patel, Nikisha [1], Barrington, David [2].

Apomixis and hybridization in Polystichum section Duropolystichum in the Himalaya and Hengduan mountains.

The fern genus Polystichum (Dryopteridaceae) has a cosmopolitan distribution with a center of diversity in Eastern Asia, where species diversity is notably rich in apomictic lineages, most of which are in in sections Xiphopolystichum and Duropolystichum. Groups rich in apomictic lineages present a challenge to elucidating evolutionary history in that asexual lineages are often polyploid and arise by hybridization.Polystichum section Duropolystichum further presents the challenge of nearly continuous morphological variation across species. The present study utilizes a molecular phylogenetic approach to sampling Polystichum sect. Duropolystichum across its Western Chinese center of diversity. In addition to using Bayesian inference to identify potential progenitors of known apomicts using both nuclear and plastid markers, we use morphometric analysis in R package Mcclust to elucidate morphological groups within apparently continuous morphological variation. By using phylogenetic and morphometric analyses in conjunction, we find evidence for multiple lineages currently circumscribed as apomictic lineages P. rigens and P. neolobatum. We hypothesize progenitors for these allopolyploid lineages and suggest recircumscription of these species.


1 - University of Tennessee, Ecology and Evolutionary Biology, Knoxville, TN, 37996, USA
2 - University Of Vermont, Plant Biology, 111 Jeffords Hall, 63 Carrigan Drive, Burlington, VT, 05405, United States

Keywords:
ferns
pteridology
apomixis
reticulation
Hybridization
Polyploidy.

Presentation Type: Oral Paper
Session: 3, Systematics I--Tracheophytes, Pteridophytes to Monocots 1
Location: 110/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 8:30 AM
Number: 3003
Abstract ID:807
Candidate for Awards:None


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