Abstract:
:Inverted repeat (IR) regions in the plastomes from land plants induce homologous recombination, generating isomeric plastomes. While the plastomes of Taxaceae species often lose one of the IR regions, considerable isomeric plastomes were created in Taxaceae species with a hitherto unclarified mechanism. To investigate the detailed mechanism underpinning the IR-independent genesis of plastomic diversity, we sequenced four Taxaceae plastomes, including Taxus cuspidata Siebold & Zuccarini, Taxus fauna Nan Li & R. R. Mill, and two individuals of Taxus wallichiana Zuccarini. Then we compared these structures with those of previously reported Taxaceae plastomes. Our analysis identified four distinct plastome forms that originated from the rearrangements of two IR-flanking inverted fragments. The presence of isomeric plastomes was then verified in T. cuspidata individuals. Both rearrangement analyses and phylogenetic results indicated that Taxaceae were separated into two clades, one including Taxus and Pseudotaxus and another formed by Amentotaxus and Torreya. Our reconstructed scenario suggests that the minimum number of inversion events required for the transformation of the plastome of Cephalotaxus oliveri Masters into the diversified Taxaceae plastomes ranged from three to six. To sum up, our study reveals a distinct pattern and the mechanism driving the structural diversification of Taxaceae plastomes, which will advance our understanding of the maintenance of plastomic diversity and complexity in conifers.
journal_name
Front Genetjournal_title
Frontiers in geneticsauthors
Zhang Y,Xu Y,Chen H,Wang L,Yin K,Du FKdoi
10.3389/fgene.2019.01295subject
Has Abstractpub_date
2020-01-14 00:00:00pages
1295issn
1664-8021journal_volume
10pub_type
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