Chen Kai, Liu Yan-Chun, Huang Yue, Wu Xu-Kun, Ma Hai-Ying, Peng Hua, Li De-Zhu, Ma Peng-Fei
State Key Laboratory of Plant Diversity and Specialty Crops, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, China.
Germplasm Bank of Wild Species & Yunnan Key Laboratory of Crop Wild Relatives Omics, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, China.
Plant Divers. 2025 Mar 15;47(3):382-393. doi: 10.1016/j.pld.2025.03.002. eCollection 2025 May.
The sugarcane subtribe Saccharinae (Andropogoneae, Poaceae) was established in 1846, but its delimitation has long been debated. Moreover, the relationships among the genera of Saccharinae remain unclear, and there is no consensus on whether , a small genus in tropical Asia with only two species, should be included. Here, we performed phylogenomic analyses using whole plastomes (69 of them newly sequenced) from 132 individuals, representing 65 species in 19 related genera. We also built trees with nuclear ribosomal DNA sequences. Our results justify the inclusion of , likely also the Clade III, in Saccharinae. Furthermore, both morphological and molecular analyses support merging the two species. The backbone relationships of the Saccharinae phylogeny were highly supported with four polyphyletic clades of and the inclusion of and in . is moderately supported as sister to the Clade I, while the remaining species could be excluded from the subtribe. Saccharinae is estimated to have originated ∼3.73 million years ago in East Asia, followed by intercontinental dispersals. Our study provides a comprehensive phylogenetic framework for future taxonomic revisions of this economically important subtribe.
甘蔗亚族（莎草科，须芒草族）于1846年建立，但其界定长期以来一直存在争议。此外，甘蔗亚族各属之间的关系仍不明确，对于是否应包括热带亚洲的一个小属（仅两种）也没有达成共识。在这里，我们使用了132个个体的全质体基因组（其中69个是新测序的）进行系统基因组分析，这些个体代表了19个相关属中的65个物种。我们还构建了核糖体DNA序列树。我们的结果证明了将该属（可能还有第三进化枝）纳入甘蔗亚族是合理的。此外，形态学和分子分析都支持将该属的两个物种合并。甘蔗亚族系统发育的主干关系得到了高度支持，有四个多系进化枝，以及将该属和另一属纳入其中。该属被适度支持为第一进化枝的姐妹属，而其余物种可从该亚族中排除。甘蔗亚族估计在约373万年前起源于东亚，随后进行了洲际扩散。我们的研究为这个具有重要经济意义的亚族未来的分类修订提供了一个全面的系统发育框架。
