Funding for this research was provided by:
National Natural Science Foundation of China (31571247)
Agriculture Research System of China (CARS-26-13)
the Agricultural Science and Technology Innovation Program (ASTIP), Chinese Academy of Agricultural Sciences (CAAS-ASTIP-2018-ZFRI-08)
Received: 12 November 2019
Accepted: 23 January 2020
First Online: 3 February 2020
Ethical approval and consent to participate
: Not applicable.
: All authors agreed to publish this manuscript.
: The authors declare that they have no competing interests.