Funding for this research was provided by:
National Natural Science Foundation of China (31471471)
National Key Research and Development Program of China (2016YFD0100101)
the Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Science (no number)
Received: 11 February 2020
Accepted: 28 May 2020
First Online: 11 June 2020
Ethics approval and consent to participate
: The authors declare that this study complies with the current laws of the countries in which the experiments were performed.
: Not applicable.
: The authors declare that they have no competing interests.