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Nuclear Genome Size is Positively Correlated with Mean LTR Insertion Date in Fern and Lycophyte Genomes

By Anthony E. Baniaga, Michael S. Barker

Posted 08 Mar 2019
bioRxiv DOI: 10.1101/571570

Nuclear genome size is highly variable in vascular plants. The composition of long terminal repeat retrotransposons (LTRs) is a chief mechanism of long term change in the amount of nuclear DNA. Compared to flowering plants, little is known about LTR dynamics in ferns and lycophytes. Drawing upon the availability of recently sequenced fern and lycophyte genomes we investigated these dynamics and placed them in the context of vascular plants. We found that similar to seed plants, mean LTR insertion dates were strongly correlated with haploid nuclear genome size. Fern and lycophyte species with small genomes such as those of the heterosporous Selaginella and members of the Salviniaceae had recent mean LTR insertion dates, whereas species with large genomes such as homosporous ferns had old mean LTR insertion dates intermediate between angiosperms and gymnosperms. This pattern holds despite methylation and life history differences in ferns and lycophytes compared to seed plants, and our results are consistent with other patterns of structural variation in fern and lycophyte genomes.

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