Abstract
Michelia shiluensis is a rare and endangered magnolia species found in South China. This species produces beautiful flowers and is thus widely used in landscape gardening. Additionally, its timber is also used for furniture production. As a result of low rates of natural reproduction and increasing levels of human impact, wild M. shiluensis populations have become fragmented. This species is now classified as endangered by the IUCN. In the present study, we characterized the complete chloroplast genome of M. shiluensis and found it to be 160,075 bp in length with two inverted repeat regions (26,587 bp each), a large single-copy region (88,105 bp), and a small copy region (18,796 bp). The genome contained 131 genes, including 86 protein-coding genes, 37 tRNAs, and 8 rRNAs. The guanine-cytosine content represented 39.26% of the overall genome. Comparative analysis revealed high similarity between the M. shiluensis chloroplast genome and those of four closely related species: Michelia odora, Magnolia laevifolia, Magnolia insignis, and Magnolia cathcartii. Phylogenetic analysis shows that M. shiluensis is most closely related to M. odora. The genomic information presented in this study is valuable for further classification, phylogenetic studies, and to support ongoing conservation efforts.
Highlights
The phylogenetic relationships among 28 Magnoliaceae species were constructed based on 79 proteincoding gene (PCG) sequences and show that M. shiluensis is most closely related to M. odora
To research the phylogenetic relationships and allow for comparisons among Magnoliaceae species, a maximum likelihood tree was constructed using RAxML [32], with 1000 bootstrap replicates, based on the PCG sequences found in 28 Magnoliaceae cp genomes
A total of 106 RNA editing sites were detected from the PCGs in M. shiluensis; with the majority of the amino acid conversions involving the conversion of serine to leucine
Summary
F. Wu (Magnoliaceae) is an endangered flowering plant that is sparsely distributed throughout Hainan Province, China [1]. Wu (Magnoliaceae) is an endangered flowering plant that is sparsely distributed throughout Hainan Province, China [1] It is characterized by leafy branches and beautiful flowers, and is, widely used in landscape gardening [2]. We characterized the cp genome of M. shiluensis and compared its sequence features with four closely related species (M. odora, M. laevifolia, Magnolia insignis, and Magnolia cathcartii). The phylogenetic relationships among 28 Magnoliaceae species were constructed based on 79 proteincoding gene (PCG) sequences and show that M. shiluensis is most closely related to M. odora
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