Abstract
Reevesia is an eastern Asian-eastern North American disjunction genus in the family Malvaceae s.l. and comprises approximately 25 species. The relationships within the genus are not well understood. Here, 15 plastomes representing 12 Reevesia species were compared, with the aim of better understanding the species circumscription and phylogenetic relationships within the genus and among genera in the family Malvaceae s.l. The 11 newly sequenced plastomes range between 161,532 and 161, 945 bp in length. The genomes contain 114 unique genes, 18 of which are duplicated in the inverted repeats (IRs). Gene content of these plastomes is nearly identical. All the protein-coding genes are under purifying selection in the Reevesia plastomes compared. The top ten hypervariable regions, SSRs, and the long repeats identified are potential molecular markers for future population genetic and phylogenetic studies. Phylogenetic analysis based on the whole plastomes confirmed the monophyly of Reevesia and a close relationship with Durio (traditional Bombacaceae) in subfamily Helicteroideae, but not with the morphologically similar genera Pterospermum and Sterculia (both of traditional Sterculiaceae). Phylogenetic relationships within Reevesia suggested that two species, R. pubescens and R. thyrsoidea, as newly defined, are not monophyletic. Six taxa, R. membranacea, R. xuefengensis, R. botingensis, R. lofouensis, R. longipetiolata and R. pycnantha, are suggested to be recognized.
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Data availability
The datasets generated and analyzed during the current study are available in the NCBI repository (https://www.ncbi.nlm.nih.gov), OL701983-OL701985, OL701987, OP856555, OP868809-OP868814. Accession numbers could also be found in Table 1. The eleven newly sequenced complete chloroplast genomes were submitted to GenBank under reviewer token numbers 197127, 2871440, 2871442, 2941023, 2645501, 2645617, 2645631, 2645634, 2645909, 2645616, 2645618.
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Acknowledgements
This work was supported by the biodiversity investigation, observation and assessment program (2019–2023) of Ministry of Ecology and Environment of China, the Strategic Priority Research Program of the Chinese Academy of Sciences (grant no. XDA13020500), and National Traditional Chinese Medicine resources survey project of State Administration of Traditional Chinese Medicine (grant no. GZY-KJS-2018-004). We would like to thank Dr. Su-Nan Huang and Zheng-Yang Niu for their help during the experiments and data analyses.
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XC and YFD planned and designed the research; LYG, QL, TYJ and JHM performed the experiment and analyzed the data; LYG and TYJ drafted the manuscript; all the authors reviewed and improved final manuscript.
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Geng, LY., Jiang, TY., Chen, X. et al. Plastome structure, phylogeny and evolution of plastid genes in Reevesia (Helicteroideae, Malvaceae). J Plant Res (2024). https://doi.org/10.1007/s10265-024-01547-y
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DOI: https://doi.org/10.1007/s10265-024-01547-y