Plant Diversity ›› 2022, Vol. 44 ›› Issue (03): 300-307.DOI: 10.1016/j.pld.2021.10.002
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Ceratopteris chunii and Ceratopteris chingii (Pteridaceae), two new diploid species from China, based on morphological, cytological, and molecular data
Jun-Hao Yua,b, Rui Zhanga, Qiao-Ling Liub, Fa-Guo Wangd, Xun-Lin Yue, Xi-Ling Daib, Yong-Bo Liuf, Yue-Hong Yana,c
- a Eastern China Conservation Centre for Wild Endangered Plant Resources, Shanghai Chenshan Botanical Garden, Shanghai 201602, China;
b College of Life Science, Shanghai Normal University, Shanghai, 200234, China;
c Shenzhen Key Laboratory for Orchid Conservation and Utilization, National Orchid Conservation Center of China and the Orchid Conservation & Research Center of Shenzhen, Shenzhen, 518114, China;
d Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China;
e College of Forestry, Central South University of Forestry ＆ Technology, Changsha, Hunan, 410004, China;
f State Environmental Protection Key Laboratory of Regional Eco-process and Function Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
Ceratopteris chunii and Ceratopteris chingii (Pteridaceae), two new diploid species from China, based on morphological, cytological, and molecular data
Jun-Hao Yua,b, Rui Zhanga, Qiao-Ling Liub, Fa-Guo Wangd, Xun-Lin Yue, Xi-Ling Daib, Yong-Bo Liuf, Yue-Hong Yana,c
- a Eastern China Conservation Centre for Wild Endangered Plant Resources, Shanghai Chenshan Botanical Garden, Shanghai 201602, China;
b College of Life Science, Shanghai Normal University, Shanghai, 200234, China;
c Shenzhen Key Laboratory for Orchid Conservation and Utilization, National Orchid Conservation Center of China and the Orchid Conservation & Research Center of Shenzhen, Shenzhen, 518114, China;
d Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China;
e College of Forestry, Central South University of Forestry ＆ Technology, Changsha, Hunan, 410004, China;
f State Environmental Protection Key Laboratory of Regional Eco-process and Function Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
摘要： 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.