Evolution of the bamboos (Bambusoideae; Poaceae): a full plastome phylogenomic analysis

Background: Bambusoideae (Poaceae) comprise three distinct and well-supported lineages: tropical woody bamboos (Bambuseae), temperate woody bamboos (Arundinarieae) and herbaceous bamboos (Olyreae). Phylogenetic studies using chloroplast markers have generally supported a sister relationship between Bambuseae and Olyreae. This suggests either at least two origins of the woody bamboo syndrome in this subfamily or its loss in Olyreae. Results: Here a full chloroplast genome (plastome) phylogenomic study is presented using the coding and noncoding regions of 13 complete plastomes from the Bambuseae, eight from Olyreae and 10 from Arundinarieae. Trees generated using full plastome sequences support the previously recovered monophyletic relationship between Bambuseae and Olyreae. In addition to these relationships, several unique plastome features were uncovered including the first mitogenome-to-plastome horizontal gene transfer observed in monocots. Conclusions: Phylogenomic agreement with p...

背景：竹亚科（禾本科）包含三个显著且支持度高的演化支：热带木本竹类（簕竹族）、温带木本竹类（青篱竹族）和草本竹类（莪利竹族）。利用叶绿体标记开展的系统发育研究普遍支持簕竹族与莪利竹族之间的姐妹群关系。这表明该亚科中木本竹类特征要么至少有两次独立起源，要么在莪利竹族中发生了丢失。结果：本研究基于13个簕竹族、8个莪利竹族和10个青篱竹族物种的完整叶绿体基因组（plastome）编码区与非编码区序列，开展了全面的叶绿体基因组系统发育研究。基于完整叶绿体基因组序列构建的系统发育树支持此前发现的簕竹族与莪利竹族的单系群关系。除上述系统发育关系外，本研究还揭示了若干独特的叶绿体基因组特征，包括单子叶植物中首次发现的线粒体基因组向叶绿体基因组的水平基因转移事件。结论：系统发育基因组学研究与p...