| Abstract Detail
Reticulate evolution and biogeography in ferns and lycophytes - a colloquium honoring Dr. David Barrington Patel, Nikisha R [1]. Reticulate evolutionary histories of apomictic lineages in East Asian Polystichum. 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 section Xiphopolystichum. Asexual lineages are often polyploid and arise by hybridization, and the origins of apomicts in Xiphopolystichum are so far unexplored. The present study samples Polystichum sect. Xiphopolystichum sensu lato in its entirety across its Western Chinese center of diversity as well as the Himalayan mountain range in order to identify progenitors of known apomicts and elucidate a complex history of reticulate evolution. Cytological analysis with flow cytometry reveals diploid, triploid, and tetraploid cytotypes of four apomicts, Polystichum xiphophyllum, P. mayebarae, P. tsus-simense, and P. neolobatum. Each cytotype has a unique suite of morphological traits contributing to the extraordinary morphological diversity found across species in Xiphopolystichum. Morphometric analysis in conjunction with molecular phylogenetics also support the recognition of new species, as well as multiple origins for allopolyploid lineages.
Log in to add this item to your schedule
1 - University of Connecticut, Ecology and Evolutionary Biology, 75 North Eagleville Rd, Storrs, Connecticut, 06269, United States
Keywords:
pteridology
Apomixis
polyploidy
Reticulation.
Presentation Type: Colloquium Presentations
Session: CO09, Reticulate evolution and biogeography in ferns and lycophytes - a colloquium honoring Dr. David Barrington
Location: San Luis 2/Starr Pass
Date: Tuesday, July 30th, 2019
Time: 4:45 PM
Number: CO09013
Abstract ID:158
Candidate for Awards:Margaret Menzel Award,Edgar T. Wherry award |
