You have access to the sequence genomes for moss and the lycophyte Selaginella. Your goal in analyzing the data is to write a ground-breaking paper that answers an important question about the evolution of plants. What questions would you try?
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Answer:
Abstract
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. We report here the genome sequence of the lycophyte Selaginella moellendorffii (Selaginella), the first nonseed vascular plant genome reported. By comparing gene content in evolutionarily diverse taxa, we found that the transition from a gametophyte- to a sporophyte-dominated life cycle required far fewer new genes than the transition from a nonseed vascular to a flowering plant, whereas secondary metabolic genes expanded extensively and in parallel in the lycophyte and angiosperm lineages. Selaginella differs in posttranscriptional gene regulation, including small RNA regulation of repetitive elements, an absence of the trans-acting small interfering RNA pathway, and extensive RNA editing of organellar genes.
Answer:
Vascular plants first appeared about 410 million years ago, after which they split into many lineages, of which only the euphyllophytes (ferns and seed plants) and the lycophytes are still alive.
The first nonseed vascular plant genome, Selaginella moellendorffii's (also known as Selaginella) genome is described here. We discovered that the expansion of secondary metabolic genes occurred extensively and simultaneously in the lycophyte and angiosperm lineages, whereas the transition from a gametophyte- to sporophyte-dominated life cycle required far fewer new genes than the transition from a nonseed vascular to a flowering plant.
Selaginella has different post-transcriptional gene regulation mechanisms, such as substantial RNA editing of the organellar RNA, small RNA regulation of repetitive regions, and absence of the trans-acting small interfering RNA pathway.
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