Plastome-based backbone phylogeny of East Asian Phedimus (Subgenus Aizoon : Crassulaceae), with special emphasis on Korean endemics
Although the monophyly of has been strongly demonstrated, the species relationships among approximately 20 species of have been difficult to determine because of the uniformity of their floral characteristics and extreme variation of their vegetative characters, often accompanied by high polyploid a...
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| Published in: | Frontiers in plant science Vol. 14; p. 1089165 |
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| Main Authors: | , , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Switzerland
Frontiers Media S.A
14-03-2023
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Although the monophyly of
has been strongly demonstrated, the species relationships among approximately 20 species of
have been difficult to determine because of the uniformity of their floral characteristics and extreme variation of their vegetative characters, often accompanied by high polyploid and aneuploid series and diverse habitats. In this study, we assembled 15 complete chloroplast genomes of
species from East Asia and generated a plastome-based backbone phylogeny of the subgenus
. As a proxy for nuclear phylogeny, we reconstructed the nuclear ribosomal DNA internal transcribed spacer (nrDNA ITS) phylogeny independently. The 15 plastomes of subg.
were highly conserved in structure and organization; hence, the complete plastome phylogeny fully resolved the species relationships with strong support. We found that
and
were polyphyletic and morphologically distinct or ambiguous species, and they most likely evolved from the two species complex. The crown age of subg.
was estimated to be 27 Ma, suggesting its origin to be in the late Oligocene; however, the major lineages were diversified during the Miocene. The two Korean endemics,
and
, were inferred to have originated recently during the Pleistocene, whereas the other endemic,
, originated in the late Miocene. Several mutation hotspots and seven positively selected chloroplast genes were identified in the subg.
. |
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| Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Edited by: Mi-Jeong Yoo, Clarkson University, United States This article was submitted to Plant Systematics and Evolution, a section of the journal Frontiers in Plant Science These authors have contributed equally to this work and share first authorship Reviewed by: Shih-Hui Liu, National Sun Yat-sen University, Taiwan; Zelong Nie, Jishou University, China |
| ISSN: | 1664-462X 1664-462X |
| DOI: | 10.3389/fpls.2023.1089165 |