Identifying multiple origins of polyploid taxa: a multilocus study of the hybrid cloak fern (Astrolepis integerrima; Pteridaceae).
Abstract
PREMISE OF THE STUDY: Molecular studies have shown that multiple origins of polyploid
taxa are the rule rather than the exception. To understand the distribution and ecology
of polyploid species and the evolutionary significance of polyploidy in general, it
is important to delineate these independently derived lineages as accurately as possible.
Although gene flow among polyploid lineages and backcrossing to their diploid parents
often confound this process, such post origin gene flow is very infrequent in asexual
polyploids. In this study, we estimate the number of independent origins of the apomictic
allopolyploid fern Astrolepis integerrima, a morphologically heterogeneous species
most common in the southwestern United States and Mexico, with outlying populations
in the southeastern United States and the Caribbean. METHODS: Plastid DNA sequence
and AFLP data were obtained from 33 A. integerrima individuals. Phylogenetic analysis
of the sequence data and multidimensional clustering of the AFLP data were used to
identify independently derived lineages. KEY RESULTS: Analysis of the two datasets
identified 10 genetic groups within the 33 analyzed samples. These groups suggest
a minimum of 10 origins of A. integerrima in the northern portion of its range, with
both putative parents functioning as maternal donors, both supplying unreduced gametes,
and both contributing a significant portion of their genetic diversity to the hybrids.
CONCLUSIONS: Our results highlight the extreme cryptic genetic diversity and systematic
complexity that can underlie a single polyploid taxon.
Type
Journal articleSubject
PteridaceaeDNA, Intergenic
DNA, Plant
RNA, Transfer, Arg
RNA, Transfer, Gly
Sequence Analysis, DNA
Evolution, Molecular
Phylogeny
Polyploidy
Genes, Plant
Geography
Molecular Sequence Data
Mexico
United States
Amplified Fragment Length Polymorphism Analysis
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https://hdl.handle.net/10161/21790Published Version (Please cite this version)
10.3732/ajb.1200199Publication Info
Beck, James B; Allison, James R; Pryer, Kathleen M; & Windham, Michael D (2012). Identifying multiple origins of polyploid taxa: a multilocus study of the hybrid cloak
fern (Astrolepis integerrima; Pteridaceae). American journal of botany, 99(11). pp. 1857-1865. 10.3732/ajb.1200199. Retrieved from https://hdl.handle.net/10161/21790.This is constructed from limited available data and may be imprecise. To cite this
article, please review & use the official citation provided by the journal.
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Kathleen M. Pryer
Professor of Biology

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