Lycophytes and seed plants constitute the typical vascular plants. Lycophytes have been thought to have no paleo-polyploidization although the event is known to be critical for the fast expansion of seed plants. Here, genomic analyses including the homologous gene dot plot analysis detected multiple paleo-polyploidization events, with one occurring approximately 13–15 million years ago (MYA) and another about 125–142 MYA, during the evolution of the genome of Selaginella moellendorffii, a model lycophyte. In addition, comparative analysis of reconstructed ancestral genomes of lycophytes and angiosperms suggested that lycophytes were affected by more paleo-polyploidization events than seed plants. Results from the present genomic analyses indicate that paleo-polyploidization has contributed to the successful establishment of both lineages—lycophytes and seed plants—of vascular plants.
石松类植物（Lycophytes）和种子植物（seed plants）构成了主要维管植物（vascular plants）。尽管古多倍化事件（paleo-polyploidization）被认为对种子植物的快速分化至关重要，但石松类一直以来被认为没有经历古多倍化事件。本文通过同源基因点阵图（homologous gene dot plot）在内的基因组分析，确定了江南卷柏（Selaginella moellendorffii）基因组进化中经历了多次古多倍化事件。其中较近的一次发生在13-15百万年前（MYA），另一次发生在125-142 百万年前。另外，本文通过对重新构建的石松类祖先和被子植物祖先的比较分析表明，石松类植物与种子植物相比，受到了更多次古多倍体化事件的影响。目前的基因组分析结果暗示，古多倍化事件对维管植物谱系（种子植物和石松类植物）的建立具有贡献。





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