ArticleBMC plant biology2025
Conserved genome structure and phylogenetic insights for the heterogeneous subfamily of Convallarioideae (Asparagaceae) revealed from plastome data.
Article in BMC plant biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundConvallarioideae, a subfamily of Asparagaceae, encompasses a wide range of morphologically diverse lineages previously classified under different traditional families and holds significant economic value. Despite its importance, chloroplast genome data for Convallarioideae remain limited, hindering a comprehensive understanding of their genome structural evolution and phylogenetic relationships. This study aims to provide a detailed characterization of chloroplast genome features and to conduct robust phylogenetic analyses of this subfamily using an expanded dataset of chloroplast genomes.
resultsThe plastomes of the subfamily exhibit a typical circular quadripartite structure with conserved genomic organization and gene content. However, variations were observed in genome size, SSRs, and codon usage across the subfamily. Nine highly variable regions and positive selection genes were identified. Phylogenetic analyses based on complete plastid genomes resolved the non-monophyly of Polygonateae. Compared to Eriospermum mackenii, the chloroplast genomes of tribe Rusceae, tribe Dracaeneae, and the Polygonatum-Disporopsis lineage showed significant size reduction.
conclusionsChloroplast genomes across Convallarioideae exhibit remarkable structural conservation. The phylogenetic analyses revealed weakly resolved backbone relationships among core members of this subfamily. Indels in the LSC region and gene loss were identified as key drivers of structural divergence in plastome size. These results clarify the interplay between genomic architecture and phylogenetic discordance, advancing our understanding of genomic evolution within Convallarioideae.
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