Ling Shao-Jun, Qin Xin-Ting, Song Xi-Qiang, Zhang Li-Na, Ren Ming-Xun
Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants (Hainan University), Ministry of Education, Haikou 570228, China Hainan University Haikou China.
Center for Terrestrial Biodiversity of the South China Sea, Hainan University, Haikou 570228, China Hainan University Haikou China.
PhytoKeys. 2020 Aug 26;157:59-81. doi: 10.3897/phytokeys..32427. eCollection 2020.
Hainan Island harbours an extraordinary diversity of Gesneriaceae with 14 genera and 23 species, amongst which two species and one variety are recognised in the genus . These three taxa are all Hainan-endemics and show a complex geographical distribution pattern with considerable morphological intermixtures. In this study, we combined DNA (nuclear ITS sequences and cpDNAL-F and 1b) to evaluate genetic delimitation for 12 populations from the island, together with morphological similarity analysis using 16 morphological traits. The results showed Hainan taxa were monophyletic with relative low genetic diversity within populations, highly significant genetic differentiation amongst populations and a significant phylogeographical structure. The 12 populations formed three genetically distinct groups, roughly correspondent to the currently recognised two species and one unknown lineage. The PCA analyses of morphological traits indicate three distinctive groups, differing mainly in petal colour and corolla shapes. The roles of river and mountain isolations in the origin and distribution of these three lineages are discussed.
海南岛拥有种类异常丰富的苦苣苔科植物，有14属23种，其中该属中有两个物种和一个变种。这三个分类群均为海南特有种，呈现出复杂的地理分布格局，形态上有相当程度的混合。在本研究中，我们结合DNA（核ITS序列和叶绿体DNA的L-F和1b）来评估该岛12个种群的遗传界定，同时使用16个形态特征进行形态相似性分析。结果表明，海南的分类群是单系的，种群内遗传多样性相对较低，种群间遗传分化高度显著，且有显著的系统地理学结构。这12个种群形成了三个遗传上不同的组，大致对应于目前认可的两个物种和一个未知谱系。形态特征的主成分分析表明有三个不同的组，主要区别在于花瓣颜色和花冠形状。本文还讨论了河流和山脉隔离在这三个谱系的起源和分布中的作用。
