Zhang Miao, Liu Xiu-Ting, Tian Min, Chen Zhang-Xue, Huang Ying-Lin, Chen Guo-Di, Chen Bing-Hua
College of Life Sciences, Fujian Normal University, Fuzhou 350117, China.
Ting Jie Natural History Studio, Guangzhou 510000, China.
PhytoKeys. 2024 Dec 2;249:231-249. doi: 10.3897/phytokeys.249.140342. eCollection 2024.
This paper introduces , a newly identified species that enriches our understanding of the diversity of the Podostemaceae in East Asia. Distinctive in its morphological traits, this species is characterized by the region's longest flowering shoots and exhibits a high number of elongated leaves per cluster, along with relatively slender roots. Phylogenetic analyses using Maximum Likelihood and Bayesian Inference methods on plastome and sequences confirm as a distinct species. It forms a clade with , its closest relative, together branching off from . The plastome of is 132,818 bp in length, comprising two inverted repeat regions of 20,881 bp, which are separated by large and small single-copy regions of 78,713 and 12,343 bp, respectively. Genetic analysis reveals the extensive loss of the and genes in the chloroplast genome, a trait common to the Podostemaceae, suggesting adaptations to environmental conditions or gene transfers to nuclear or mitochondrial genomes. This study improves the clarity of phylogenetic relationships in previous studies and underscores the importance of continued taxonomic and phylogenetic research.
本文介绍了一种新发现的物种，它丰富了我们对东亚川苔草科植物多样性的认识。该物种在形态特征上独具特色，其特点是该地区最长的花茎，每簇有大量细长的叶子，以及相对纤细的根。利用最大似然法和贝叶斯推断法对质体基因组和序列进行的系统发育分析证实该物种是一个独特的物种。它与最亲近的近缘种形成一个分支，共同从分支出来。该物种的质体基因组长度为132,818 bp，包括两个长度为20,881 bp的反向重复区域，分别由长度为78,713 bp和12,343 bp的大单拷贝区域和小单拷贝区域隔开。遗传分析揭示了叶绿体基因组中rpl20和rps12基因的大量缺失，这是川苔草科植物共有的特征，表明其对环境条件的适应或基因转移到核基因组或线粒体基因组。本研究提高了先前研究中系统发育关系的清晰度，并强调了持续进行分类学和系统发育研究的重要性。
