Complete plastomes of six species of Wikstroemia (Thymelaeaceae) reveal paraphyly with the monotypic genus Stellera

Abstract Wikstroemia (Thymelaeaceae) is a diverse genus that extends from Asia to Australia and has been recorded on the Hawaiian Islands. Despite its medicinal properties and resource utilization in pulp production, genetic studies of the species in this important genus have been neglected. In this...

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Autores principales:	Liefen He, Yonghong Zhang, Shiou Yih Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7f7407f442f14bb2bbd60d5c70896554
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spelling	oai:doaj.org-article:7f7407f442f14bb2bbd60d5c708965542021-12-02T18:18:51ZComplete plastomes of six species of Wikstroemia (Thymelaeaceae) reveal paraphyly with the monotypic genus Stellera10.1038/s41598-021-93057-32045-2322https://doaj.org/article/7f7407f442f14bb2bbd60d5c708965542021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93057-3https://doaj.org/toc/2045-2322Abstract Wikstroemia (Thymelaeaceae) is a diverse genus that extends from Asia to Australia and has been recorded on the Hawaiian Islands. Despite its medicinal properties and resource utilization in pulp production, genetic studies of the species in this important genus have been neglected. In this study, the plastome sequences of six species of Wikstroemia were sequenced and analysed. The plastomes ranged in size between 172,610 bp (W. micrantha) and 173,697 bp (W. alternifolia) and exhibited a typical genome structure consisting of a pair of inverted repeat (IR) regions separated by a large single-copy (LSC) region and a small single-copy (SSC) region. The six plastomes were similar in the 138 or 139 genes predicted, which consisted of 92 or 93 protein-coding genes, 38 tRNA genes, and 8 rRNA genes. The overall GC contents were identical (36.7%). Comparative genomic analyses were conducted with the inclusion of two additional published species of Wikstroemia in which the sequence divergence and expansion of IRs in the plastomes were determined. When compared to the coding sequences (CDSs) of Aquilaria sinensis, five genes, namely, rpl2, rps7, rps18, ycf1 and ycf2, indicated positive selection in W. capitata. The plastome-based phylogenetic analysis inferred that Wikstroemia in its current state is paraphyletic to Stellera chamaejasme, while the ITS-based tree analyses could not properly resolve the phylogenetic relationship between Stellera and Wikstroemia. This finding rekindled interest in the proposal to synonymize Stellera with Wikstroemia, which was previously proposed but rejected due to taxonomic conflicts. Nevertheless, this study provides valuable genomic information to aid in the taxonomic implications and phylogenomic reconstruction of Thymelaeaceae.Liefen HeYonghong ZhangShiou Yih LeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Liefen He Yonghong Zhang Shiou Yih Lee Complete plastomes of six species of Wikstroemia (Thymelaeaceae) reveal paraphyly with the monotypic genus Stellera
description	Abstract Wikstroemia (Thymelaeaceae) is a diverse genus that extends from Asia to Australia and has been recorded on the Hawaiian Islands. Despite its medicinal properties and resource utilization in pulp production, genetic studies of the species in this important genus have been neglected. In this study, the plastome sequences of six species of Wikstroemia were sequenced and analysed. The plastomes ranged in size between 172,610 bp (W. micrantha) and 173,697 bp (W. alternifolia) and exhibited a typical genome structure consisting of a pair of inverted repeat (IR) regions separated by a large single-copy (LSC) region and a small single-copy (SSC) region. The six plastomes were similar in the 138 or 139 genes predicted, which consisted of 92 or 93 protein-coding genes, 38 tRNA genes, and 8 rRNA genes. The overall GC contents were identical (36.7%). Comparative genomic analyses were conducted with the inclusion of two additional published species of Wikstroemia in which the sequence divergence and expansion of IRs in the plastomes were determined. When compared to the coding sequences (CDSs) of Aquilaria sinensis, five genes, namely, rpl2, rps7, rps18, ycf1 and ycf2, indicated positive selection in W. capitata. The plastome-based phylogenetic analysis inferred that Wikstroemia in its current state is paraphyletic to Stellera chamaejasme, while the ITS-based tree analyses could not properly resolve the phylogenetic relationship between Stellera and Wikstroemia. This finding rekindled interest in the proposal to synonymize Stellera with Wikstroemia, which was previously proposed but rejected due to taxonomic conflicts. Nevertheless, this study provides valuable genomic information to aid in the taxonomic implications and phylogenomic reconstruction of Thymelaeaceae.
format	article
author	Liefen He Yonghong Zhang Shiou Yih Lee
author_facet	Liefen He Yonghong Zhang Shiou Yih Lee
author_sort	Liefen He
title	Complete plastomes of six species of Wikstroemia (Thymelaeaceae) reveal paraphyly with the monotypic genus Stellera
title_short	Complete plastomes of six species of Wikstroemia (Thymelaeaceae) reveal paraphyly with the monotypic genus Stellera
title_full	Complete plastomes of six species of Wikstroemia (Thymelaeaceae) reveal paraphyly with the monotypic genus Stellera
title_fullStr	Complete plastomes of six species of Wikstroemia (Thymelaeaceae) reveal paraphyly with the monotypic genus Stellera
title_full_unstemmed	Complete plastomes of six species of Wikstroemia (Thymelaeaceae) reveal paraphyly with the monotypic genus Stellera
title_sort	complete plastomes of six species of wikstroemia (thymelaeaceae) reveal paraphyly with the monotypic genus stellera
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/7f7407f442f14bb2bbd60d5c70896554
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Complete plastomes of six species of Wikstroemia (Thymelaeaceae) reveal paraphyly with the monotypic genus Stellera

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