A diploids-first approach to species delimitation and interpreting polyploid evolution in the fern genus astrolepis (pteridaceae)
Abstract
Polyploidy presents a challenge to those wishing to delimit the species within a group
and reconstruct the phylogenetic relationships among these taxa. A clear understanding
of the tree-like relationships among the diploid species can provide a framework upon
which to reconstruct the reticulate events that gave rise to the polyploid lineages.
In this study we apply this "diploids-first" strategy to the fern genus Astrolepis
(Pteridaceae). Diploids are identified using the number of spores per sporangium and
spore size. Analyses of plastid and low-copy nuclear sequence data provide well-supported
estimates of phylogenetic relationships, including strong evidence for two morphologically
distinctive diploid lineages not recognized in recent treatments. One of these corresponds
to the type of Notholaena deltoidea, a species that has not been recognized in any
modern treatment of Astrolepis. This species is resurrected here as the new combination
Astrolepis deltoidea . The second novel lineage is that of a diploid initially hypothesized
to exist by molecular and morphological characteristics of several established Astrolepis
allopolyploids. This previously missing diploid species is described here as Astrolepis
obscura. © Copyright 2010 by the American Society of Plant Taxonomists.
Type
Journal articleSubject
Science & TechnologyLife Sciences & Biomedicine
Plant Sciences
Evolutionary Biology
Astrolepis
"diploids-first"
gapCp
missing diploid
polyploidy
traG-traR
MOLECULAR PHYLOGENETIC-RELATIONSHIPS
DNA-SEQUENCES
CHEILANTHOID FERNS
CHLOROPLAST DNA
ORIGINS
NUCLEAR
COMPLEX
TREES
PHYLOGEOGRAPHY
HYBRIDIZATION
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https://hdl.handle.net/10161/21797Published Version (Please cite this version)
10.1600/036364410791638388Publication Info
Beck, James B; Windham, Michael D; Yatskievych, George; & Pryer, Kathleen M (2010). A diploids-first approach to species delimitation and interpreting polyploid evolution
in the fern genus astrolepis (pteridaceae). Systematic Botany, 35(2). pp. 223-234. 10.1600/036364410791638388. Retrieved from https://hdl.handle.net/10161/21797.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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