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.


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
Number: 0013
Abstract ID:158
Candidate for Awards:Margaret Menzel Award,Edgar T. Wherry award


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