期刊
MOLECULAR PHYLOGENETICS AND EVOLUTION
卷 133, 期 -, 页码 24-32出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2018.12.012
关键词
Podocarp; Cupressophytes; Huon pine; Plastid genome; Plastome evolution; Repetitive DNA
资金
- ERC [666053]
- Ministry of Science and Technology Taiwan [MOST 103-2621-B-001-007-MY3]
- Biodiversity Research Center's PI grant
- Taiwan International Graduate Program Student Fellowship
Podocarpaceae is the largest family in cupressophytes (conifers II), but its plastid genomes (plastomes) are poorly studied, with plastome data currently existing for only four of the 19 Podocarpaceous genera. In this study, we sequenced and assembled the complete plastomes from representatives of eight additional genera, including Afrocarpus, Dacrydium, Lagarostrobos, Lepidothamnus, Pherosphaera, Phyllocladus, Prumnopitys, and Saxegothaea. We found that Lagarostrobos, a monotypic genus native to Tasmania, has the largest plastome (151,496 bp) among any cupressophytes studied to date. Plastome enlargement in Lagarostrobos coincides with increased intergenic spacers, repeats, and duplicated genes. Among the Podocarpaceae, Lagarostrobos has the most rearranged plastome, but its substitution rates are modest. Plastid phylogenomic analyses based on 81 plastid genes clarify the positions of previously conflicting Podocarpaceous genera. Tree topologies firmly support the division of Podocarpaceae into two sister clades: (1) the Prumnopityoid Glade and (2) the Glade containing Podocarpoid, Dacrydioid, Pherosphaera, and Saxegothaea. The Phyllocladus is nested within the Podocarpaceae, thus familial status of the monotypic Phyllocladaceae is not supported.
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