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Deciphering the origins of apomictic polyploids in the Cheilanthes yavapensis complex (Pteridaceae).

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Date
2009-09
Authors
Grusz, AL
Windham, MD
Pryer, KM
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Abstract
Deciphering species relationships and hybrid origins in polyploid agamic species complexes is notoriously difficult. In this study of cheilanthoid ferns, we demonstrate increased resolving power for clarifying the origins of polyploid lineages by integrating evidence from a diverse selection of biosystematic methods. The prevalence of polyploidy, hybridization, and apomixis in ferns suggests that these processes play a significant role in their evolution and diversification. Using a combination of systematic approaches, we investigated the origins of apomictic polyploids belonging to the Cheilanthes yavapensis complex. Spore studies allowed us to assess ploidy levels; plastid and nuclear DNA sequencing revealed evolutionary relationships and confirmed the putative progenitors (both maternal and paternal) of taxa of hybrid origin; enzyme electrophoretic evidence provided information on genome dosage in allopolyploids. We find here that the widespread apomictic triploid, Cheilanthes lindheimeri, is an autopolyploid derived from a rare, previously undetected sexual diploid. The apomictic triploid Cheilanthes wootonii is shown to be an interspecific hybrid between C. fendleri and C. lindheimeri, whereas the apomictic tetraploid C. yavapensis is comprised of two cryptic and geographically distinct lineages. We show that earlier morphology-based hypotheses of species relationships, while not altogether incorrect, only partially explain the complicated evolutionary history of these ferns.
Type
Journal article
Subject
Science & Technology
Life Sciences & Biomedicine
Plant Sciences
apomixis
Cheilanthes
cryptic species
enzyme electrophoresis
gapCp
hybridization
low-copy nuclear gene
multiple origins
polyploidy
Pteridaceae
NONCODING CHLOROPLAST DNA
PHYLOGENETIC-RELATIONSHIPS
MATERNAL INHERITANCE
FERNS
EVOLUTION
UTILITY
HYBRIDIZATION
MONILOPHYTES
INFERENCES
ASTERACEAE
Permalink
https://hdl.handle.net/10161/21801
Published Version (Please cite this version)
10.3732/ajb.0900019
Publication Info
Grusz, AL; Windham, MD; & Pryer, KM (2009). Deciphering the origins of apomictic polyploids in the Cheilanthes yavapensis complex (Pteridaceae). American journal of botany, 96(9). pp. 1636-1645. 10.3732/ajb.0900019. Retrieved from https://hdl.handle.net/10161/21801.
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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Scholars@Duke

Pryer

Kathleen M. Pryer

Professor of Biology
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