J Syst Evol ›› 2023, Vol. 61 ›› Issue (5): 776-789.DOI: 10.1111/jse.12909

• Research Articles • Previous Articles     Next Articles

Biogeographic patterns of polyploid species for the angiosperm flora in China

Kai-Lai Wang, Pu-Rong Deng, Zhi Yao, Jin-Yi Dong, Zhi He, Peng Yang, and Yong-Bo Liu*   

  1. State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory of Regional Eco-process and Function Assessment, Chinese Research Academy of Environmental Sciences,8 Dayangfang, Beijing 100012, China
    *Author for correspondence. E-mail:liuyb@craes.org.cn. Tel. /Fax:86-10-84910906
  • Received:2022-04-17 Accepted:2022-08-11 Online:2022-08-26 Published:2023-09-01

Abstract: Exploring the frequency and distribution pattern of polyploid species in geographic parameters is of significance in understanding the mechanisms of polyploid speciation and evolutionary drivers of biodiversity. We here explored polyploid and paleopolyploid incidence frequency in a scale of 100×100 km grids in China. We found 33% of angiosperm species are polyploidy in China, and 23% of polyploid speciation. Western China and eastern China showed a significantly different polyploid and paleopolyploid frequency, with an evolutionary cradle of polyploid angiosperms in the Qinghai-Tibetan plateau. Herbaceous species exhibited higher polyploid frequency but lower paleopolyploid frequency than woody species, indicating the former experienced more rapid differentiation and speciation than the latter. Our results indicate that western China is an evolutionary cradle for polyploid angiosperms where harsh environment facilitates the establishment and survival of polyploids, while polyploid lineages tend to rediploidize to be diploids with sufficient time in suitable environment.

Key words: angiosperm flora, biogeographic patterns, plant speciation, polyploid frequency, polyploid survival index, rediploidization