SRP106198Transcriptome of 1 hornwort, 4 lycophytes and 21 ferns
Selaginella moellendorffii, Diplazium esculentum, Asplenium nidus, Pteris vittata, Microlepia platyphylla, Azolla caroliniana, Salvinia molesta, Salvinia cucullata, Lygodium japonicum, Diplopterygium chinense, Dicranopteris pedata, Angiopteris fokiensis, Equisetum ramosissimum, Palhinhaea cernua, Isoetes sinensis, Folioceros fuciformis, Microsorum cuspidatum, Selaginella uncinata, Cyrtomium fortunei, Odontosoria chinensis, Alsophila spinulosa, Cibotium barometz, Vandenboschia striata, Plenasium vachellii, Psilotum nudum, Ophioglossum vulgatum
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Pathways underlying miRNA biogenesis, degradation, and activity were established early in land plant evolution, but the 24-nt siRNA pathway that guides DNA methylation was incomplete in early land plants, especially lycophytes. We show that the functional diversification of key gene families such as DICER-LIKE and ARGONAUTE (AGO) as observed in angiosperms occurred early in land plants followed by parallel expansion of the AGO family in ferns and angiosperms. We uncovered an unexpected AGO family specific to lycophytes and ferns. Our phylogenetic analyses of miRNAs in lycophytes, bryophytes, ferns, and angiosperms refined the temporal origination of conserved miRNA families in land plants.
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