Funding for this research was provided by:
Qingdao People's Livelihood Science and Technology Project (19-9-1-254-nsh)
Received: 23 March 2021
Accepted: 21 June 2021
First Online: 15 July 2021
: All methods involving rhubarb samples were carried out in accordance with relevant guidelines of “List of National Key Protected Wild Plants of China”.
: Not applicable.
: The authors declare that they have no competing interests.