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TAXON

Plant Diversity and Resources

Impacts of domestication on population genetics of a traditional Chinese medicinal herb, Atractylodes macrocephala (Asteraceae)

Chuan Chen1,2#, Li Zheng1,3#, Qing Ma1, Wen-Bin Zhou1, Yin Lu4, Yun-Peng Zhao1*, and Cheng-Xin Fu1*

1Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, College of Life Sciences, Zhejiang University, Hangzhou 310058, China

2Hangzhou Botanical Garden, Hangzhou 310013, China

3Key Laboratory, The Second Affiliated Hospital of Jiaxing College, Jiaxing, Zhejiang 314000, China

4College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015 , China

Keywords: Atractylodes macrocephala, cpDNA, nSSR, population genetics, traditional Chinese medicine.

Abstract:

As a medicinal herb, Atractylodes macrocephala experienced centuries of cultivation in China, and germplasm resources of all cultivated populations have degraded over time as a consequence of domestication processes. This study used chloroplast DNA and microsatellites to clarify not only the effects of domestication on population genetics, but also determine the geographic origins of landraces. The results revealed that cultivated populations (except ‘Pingzhu’ landrace) exhibited higher genetic diversity than their wild counterparts and low levels of genetic differentiation occurred between cultivated and wild groups. Furthermore, STRUCTURE and UPGMA analyses grouped all wild populations into three genotypic clusters, two of which (in Shaanxi and Hunan Province) shared the same gene pool with cultivated A. macrocephala, suggesting that wild populations in Central China have been involved in the origin of cultivated A. macrocephala. Moreover, the wild population from Qimen, Anhui Province and the cultivated ‘Pingzhu’ landrace harbor unique gene pools and rare alleles that could be useful in future breeding efforts. This large-scale analysis of population genetics on a medicinal herb that has a centuries-long history of human-mediated selection will facilitate utilization and conservation of the valuable genetic resources of medicinal species.


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