Incongruence between primary sequence data and the distribution of a mitochondrial atp1 group II intron among ferns and horsetails.
Abstract
Using DNA sequence data from multiple genes (often from more than one genome compartment)
to reconstruct phylogenetic relationships has become routine. Augmenting this approach
with genomic structural characters (e.g., intron gain and loss, changes in gene order)
as these data become available from comparative studies already has provided critical
insight into some long-standing questions about the evolution of land plants. Here
we report on the presence of a group II intron located in the mitochondrial atp1 gene
of leptosporangiate and marattioid ferns. Primary sequence data for the atp1 gene
are newly reported for 27 taxa, and results are presented from maximum likelihood-based
phylogenetic analyses using Bayesian inference for 34 land plants in three data sets:
(1) single-gene mitochondrial atp1 (exon+intron sequences); (2) five combined genes
(mitochondrial atp1 [exon only]; plastid rbcL, atpB, rps4; nuclear SSU rDNA); and
(3) same five combined genes plus morphology. All our phylogenetic analyses corroborate
results from previous fern studies that used plastid and nuclear sequence data: the
monophyly of euphyllophytes, as well as of monilophytes; whisk ferns (Psilotidae)
sister to ophioglossoid ferns (Ophioglossidae); horsetails (Equisetopsida) sister
to marattioid ferns (Marattiidae), which together are sister to the monophyletic leptosporangiate
ferns. In contrast to the results from the primary sequence data, the genomic structural
data (atp1 intron distribution pattern) would seem to suggest that leptosporangiate
and marattioid ferns are monophyletic, and together they are the sister group to horsetails--a
topology that is rarely reconstructed using primary sequence data.
Type
Journal articleSubject
EquisetumFerns
Mitochondrial Proteins
DNA, Complementary
Sequence Alignment
Evolution, Molecular
Phylogeny
Amino Acid Sequence
Base Sequence
Genes, Plant
Introns
Molecular Sequence Data
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https://hdl.handle.net/10161/21858Published Version (Please cite this version)
10.1016/j.ympev.2005.04.008Publication Info
Wikström, N; & Pryer, KM (2005). Incongruence between primary sequence data and the distribution of a mitochondrial
atp1 group II intron among ferns and horsetails. Molecular phylogenetics and evolution, 36(3). pp. 484-493. 10.1016/j.ympev.2005.04.008. Retrieved from https://hdl.handle.net/10161/21858.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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