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Resolving a nearly 90-year-old enigma:The rare fagus chienii is conspecific with F.hayatae based on molecular and morphological evidence

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Plant Diversity 2023年第5期45卷 544-551页

作者： Dan-Qi Li Lu Jiang Hua Liang Da-Hai Zhu Deng-Mei Fan Yi-Xuan Kou Yi Yang Zhi-Yong Zhang College of Forestry Jiangxi Agricultural UniversityNanchang 330045China Laboratory of Subtropical Biodiversity Jiangxi Agricultural UniversityNanchang 330045China Lushan Botanical Garden Jiangxi Province and Chinese Academy of SciencesJiujiang 332900China Longxi-Hongkou National Reserve Chengdu 611830China Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection(Guangxi Normal University) Ministry of EducationGuilin 541004China Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin Guilin 541006China

Taxonomic uncertainties of rare species often hinder effective prioritization for conservation.One such taxonomic uncertainty is the 90-year-old enigma of fagus chienii.F.chienii was previously only known from the type specimens collected in 1935 in Pingwu County of Sichuan Province,China,and has long been thought to be on the verge of extinction.However,morphological similarities to closely related fagus species have led many to question the taxonomic status of F.chienii.To clarify this taxonomic uncertainty,we used the newly collected samples to reconstruct a molecular phylogeny of Chinese fagus species against the phylogenetic backbone of the whole genus using seven nuclear genes.In addition,we examined nine morphological characters to determine whether F.chienii is morphologically distinct from its putatively closest relatives(F.hayatae,F.longipetiolata,and F.lucida).Both morphological and phylogenetic analyses indicated that F.chienii is conspecific with F.hayatae.We recommended that F.chienii should not be treated as a separate species in conservation management.However,conservation strategies such as in situ protection and ex situ germplasm preservation should be adopted to prevent the peculiar“F.chienii”population from extinction.

关键词： Conspecific fagus chienii F.hayatae Phylogenetics Morphology Conservation

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