Ceratopteris chunii and Ceratopteris chingii (Pteridaceae), two new diploid species from China, based on morphological, cytological, and molecular data

作者：Jun-Hao Yu, Rui Zhang, Qiaoling Liu, Faguo Wang, Xun‐Lin Yu, Xiling Dai, Yongbo Liu, Yue‐Hong Yan · 发表于：Acta Botanica Yunnanica · 年份：2021 · DOI：10.1016/j.pld.2021.10.002 · 被引用次数：11 · 研究领域：Fern and Epiphyte Biology、Plant and animal studies、Plant Diversity and Evolution

Understanding how natural hybridization and polyploidizations originate in plants requires identifying potential diploid ancestors. However, cryptic plant species are widespread, particularly in Ceratopteris (Pteridaceae). Identifying Ceratopteris cryptic species with different polyploidy levels is a challenge because Ceratopteris spp. exhibit high degrees of phenotypic plasticity. Here, two new cryptic species of Ceratopteris, Ceratopteris chunii and Ceratopteris chingii, are described and illustrated. Phylogenetic analyses reveal that each of the new species form a well-supported clade. C. chunii and C. chingii are similar to Ceratopteris gaudichaudii var. vulgaris and C. pteridoides, respectively, but distinct from their relatives in the stipe, basal pinna of the sterile leaf or subelliptic shape of the fertile leaf, as well as the spore surface. In addition, chromosome studies indicate that C. chunii and C. chingii are both diploid. These findings will help us further understand the origin of Ceratopteris polyploids in Asia.