Order-level fern plastome phylogenomics: new insights from Hymenophyllales

American Journal of Botany
Li-Yaung KuoFay-Wei Li

Abstract

Filmy ferns (Hymenophyllales) are a highly specialized lineage, having mesophyll one-cell layer thick and inhabiting particularly shaded and humid environments. The phylogenetic placement of Hymenophyllales has been inconclusive, and while over 87 whole fern plastomes have been published, none was from Hymenophyllales. To better understand the evolutionary history of filmy ferns, we sequenced the first complete plastome for this order. We compiled a phylogenomic plastome data set encompassing all 11 fern orders, and reconstructed phylogenies using different data types (nucleotides, codons, and amino acids) and partition schemes (codon positions and loci). To infer the evolution of fern plastome organization, we coded plastome features, including inversions, inverted repeat boundary shifts, gene losses, and tRNA anticodon sequences as characters, and reconstructed the ancestral states for these characters. We discovered a suite of novel, Hymenophyllales-specific plastome structures that likely resulted from repeated expansions and contractions of the inverted repeat regions. Our phylogenetic analyses reveal that Hymenophyllales is highly supported as either sister to Gleicheniales or to Gleicheniales + the remaining non-Osmundal...Continue Reading

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Aug 31, 2018·Genome Biology and Evolution·Tanner A RobisonEric Schuettpelz
Dec 29, 2020·Mitochondrial DNA. Part B, Resources·Yang PengTao Peng

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