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The compact Selaginella genome identifies changes in gene content associated with the evolution of vascular plants
Ist Teil von
Science (American Association for the Advancement of Science), 2011-05, Vol.332 (6032), p.960-963
Erscheinungsjahr
2011
Quelle
Science Online_科学在线
Beschreibungen/Notizen
Vascular plants appeared ~410 million years ago then diverged into several lineages of which only two survive: the euphyllophytes (ferns and seed plants) and the lycophytes (
1
). We report here the genome sequence of the lycophyte
Selaginella moellendorffii
(Selaginella), the first non-seed vascular plant genome reported. By comparing gene content in evolutionary diverse taxa, we found that the transition from a gametophyte- to sporophyte-dominated life cycle required far fewer new genes than the transition from a non-seed vascular to a flowering plant, while secondary metabolic genes expanded extensively and in parallel in the lycophyte and angiosperm lineages. Selaginella differs in post-transcriptional gene regulation, including small RNA regulation of repetitive elements, an absence of the tasiRNA pathway and extensive RNA editing of organellar genes.