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The cpDNA of Welwitschia mirabilis (the only species of Welwitschiales) was recently reported to be the most reduced and compact among photosynthetic land plants. However, cpDNAs of the other two gnetophyte lineages (viz. Ephedrales and Gnetales) have not yet been studied. It remains unclear what underlining mechanisms have downsized the cpDNA. To pin down major factors for cpDNA reduction and compaction...
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