Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, China.
Int J Mol Sci. 2023 Apr 18;24(8):7419. doi: 10.3390/ijms24087419.
is identified and described as a cryptic species from Sichuan Province, China. Although the distribution of this cryptic species overlaps with that of and , the morphological boundaries between them are explicit and have obviously distinguishable characters. The main distinguishing features of the cryptic species are as follows: long conical multi-branched roots, very short pedicels in compound umbels, unequal rays, oblong-globose fruits, 1-2 vittae per furrow and 3-4 vittae on the commissure. The above-mentioned features differ somewhat from other species within the genus , but generally coincide with the morphological boundaries defined for the genus . To determine the taxonomic position of , we sequenced and assembled the plastomes of and compared them with the plastomes of 11 other species of the genus . Notably, both phylogenetic analyses based on ITS sequences and the complete chloroplast genome robustly supported that three accessions of are monophyletic clade and then nested in genus. Moreover, the plastid genomes of 12 species, including the new species, were highly conserved in terms of gene order, gene content, codon bias, IR boundaries and SSR content. Overall, the integration of morphological, comparative genomic and phylogenetic evidence indicates that actually represents a new species.
被鉴定并描述为来自中国四川省的一个隐种。虽然该隐种的分布与 和 重叠，但它们之间的形态边界是明确的，具有明显可区分的特征。隐种的主要鉴别特征如下：长锥形多分枝的根，复伞形花序中极短的花梗，不等长的射线，长圆形-球形果实，每棱 1-2 条维管束，棱上 3-4 条维管束。上述特征与该属内的其他物种有些不同，但通常与该属的形态边界定义一致。为了确定 的分类地位，我们对 和 的质体基因组进行了测序和组装，并与该属的 11 种其他物种的质体基因组进行了比较。值得注意的是，基于 ITS 序列的系统发育分析和完整的叶绿体基因组都强有力地支持了三个 的单系分支，并嵌套在 属中。此外，包括新种在内的 12 种 物种的质体基因组在基因顺序、基因含量、密码子偏好、IR 边界和 SSR 含量方面高度保守。总的来说，形态学、比较基因组学和系统发育证据的综合表明， 实际上代表了一个新的物种。
