Journal of Ginseng Research

The Korean Society of Ginseng (고려인삼학회)
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Cold-induced ginsenosides accumulation is associated with the alteration in DNA methylation and relative gene expression in perennial American ginseng (Panax quinquefolius L.) along with its plant growth and development process

  • Hao, Mengzhen (Department of Pharmcognosy, School of Pharmacy, Qingdao University) ;
  • Zhou, Yuhang (Faculty of Medicine, Tottori University) ;
  • Zhou, Jinhui (Department of Pharmcognosy, School of Pharmacy, Qingdao University) ;
  • Zhang, Min (Department of Pharmcognosy, School of Pharmacy, Qingdao University) ;
  • Yan, Kangjiao (Department of Pharmcognosy, School of Pharmacy, Qingdao University) ;
  • Jiang, Sheng (Shandong Wendeng Jizhen Ginseng Industry Co., Ltd.) ;
  • Wang, Wenshui (Shandong Wendeng Jizhen Ginseng Industry Co., Ltd.) ;
  • Peng, Xiaoping (Department of Pharmcognosy, School of Pharmacy, Qingdao University) ;
  • Zhou, San (Department of Pharmcognosy, School of Pharmacy, Qingdao University)
  • Received : 2019.01.31
  • Accepted : 2019.06.25
  • Published : 2020.09.15
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Abstract

Background: Ginsenosides accumulation responses to temperature are critical to quality formation in cold-dependent American ginseng. However, the studies on cold requirement mechanism relevant to ginsenosides have been limited in this species. Methods: Two experiments were carried out: one was a multivariate linear regression analysis between the ginsenosides accumulation and the environmental conditions of American ginseng from different sites of China and the other was a synchronous determination of ginsenosides accumulation, overall DNA methylation, and relative gene expression in different tissues during different developmental stages of American ginseng after experiencing different cold exposure duration treatments. Results: Results showed that the variation of the contents as well as the yields of total and individual ginsenosides Rg1, Re, and Rb1 in the roots were closely associated with environmental temperature conditions which implied that the cold environment plays a decisive role in the ginsenoside accumulation of American ginseng. Further results showed that there is a cyclically reversible dynamism between methylation and demethylation of DNA in the perennial American ginseng in response to temperature seasonality. And sufficient cold exposure duration in winter caused sufficient DNA demethylation in tender leaves in early spring and then accompanied the high expression of flowering gene PqFT in flowering stages and ginsenosides biosynthesis gene PqDDS in green berry stages successively, and finally, maximum ginsenosides accumulation occurred in the roots of American ginseng. Conclusion: We, therefore, hypothesized that cold-induced DNA methylation changes might regulate relative gene expression involving both plant development and plant secondary metabolites in such cold-dependent perennial plant species.

Keywords

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