Cytotaxonomy of the endemic Karst and Danxia ferns in Adiantum (Pteridaceae)

AI-HUA WANG; XIAO-LING YU; XIAO-DONG MA; YUE-HONG YAN; FA-GUO WANG; HONG-FENG CHEN

doi:10.11646/phytotaxa.561.3.2

Issue: Vol. 561 No. 3: 12 September 2022

Type: Article

Published: 2022-09-12

DOI: 10.11646/phytotaxa.561.3.2

Page range: 243-255

Abstract views: 31

PDF downloaded: 19

**Cytotaxonomy of the endemic Karst and Danxia ferns in Adiantum (Pteridaceae)**

AI-HUA WANG⁺⁻
XIAO-LING YU⁺⁻
XIAO-DONG MA⁺⁻
YUE-HONG YAN⁺⁻
FA-GUO WANG⁺⁻
HONG-FENG CHEN⁺⁻

Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China; Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Ministry of Education, Nanning Normal University, Nanning 530001, China

Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China

Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing 100091, China

Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, the National Orchid Conservation Center of China and the Orchid Conservation & Research Center of Shenzhen, Shenzhen 518114, China

Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China

cytotaxonomy chromosome numbers polyploidy cytotypes Adiantum Pteridophytes

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Abstract

Chromosome traits may differ between closely related ferns growing in different geological landscapes. Adiantum series Gravesiana (Pteridaceae) includes six species, of which, five species are exclusively distributed in Karst landforms, and one, Adiantum juxtapositum, grows on Danxia landform. Additionally, there are some populations or individuals whose morphology are between different species, which may be the results of polyploidization or hybridization. Here we studied chromosome numbers of species in series Gravesiana primarily using crosiers. Results are: A. longzhouensis and A. juxtapositum were diploids with 2n = 60 and 2n = 64, respectively; A. dentatum was deduced to be diploids with 2n = ca. 60; A. mariesii had two cytotypes, 2n = 60 (diploid) and 2n = ca. 120 (tetraploid), respectively; A. gravesii had four cytotypes including 2n = ca. 60 (diploid), ca. 120 (tetraploid), ca. 150 (pentaploid), and ca. 180 (hexaploid). All these different cytotypes suggest polyploidization and hybridization have occurred in A. gravesii and A. mariesii, so we treated these two species as two “complex group”. All chromosome numbers in this study are the first record.

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