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- W2777431773 abstract "The rapid increase in plastome availability on GenBank has greatly deepened our understanding of plastomic evolution and plastid phylogenomics in gymnosperms. The plastomes of the five extant gymnosperm groups show distinctive evolutionary patterns. For example, those of cycads are conserved in architecture, gene content, and nucleotide substitution rates. Compared to cycads, the plastome of ginkgo has its inverted repeats (IRs) slightly contracted. The IRs of the three gnetophyte genera, represented by Ephedra, Gnetum, and Welwitschia, have undergone multiple expansions, contractions, and inversions. Meanwhile, the highly rearranged plastomes of Pinaceae and cupressophytes lack canonical IRs and contain lineage-specific repeats that trigger the generation of isomeric plastomes. In terms of nucleotide substitution rates, the plastome of ginkgo features an extremely slow rate of nucleotide substitutions, similar to those of cycads. In contrast, the plastomes of gnetophytes have relatively accelerated rates of nucleotide substitutions. Comparatively, nucleotide substitution rates in the plastomes of Pinaceae and cupressophytes are faster than cycads and ginkgo, but slower than those of gnetophytes. In this chapter, we summarize the progression of these findings and discuss potential causes for the variation in gymnosperms. We also review the use of these plastomes for resolving long-standing issues in seed plant and gymnosperm phylogenies. We conclude this chapter with some future directions for plastomic studies in gymnosperms." @default.
- W2777431773 created "2018-01-05" @default.
- W2777431773 creator A5006036679 @default.
- W2777431773 creator A5017146527 @default.
- W2777431773 creator A5064976582 @default.
- W2777431773 date "2018-01-01" @default.
- W2777431773 modified "2023-10-18" @default.
- W2777431773 title "Evolution of Gymnosperm Plastid Genomes" @default.
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- W2777431773 doi "https://doi.org/10.1016/bs.abr.2017.11.018" @default.
- W2777431773 hasPublicationYear "2018" @default.