Funding for this research was provided by:
The China Agriculture Research System (CARS-44)
The Agricultural Science and Technology Innovation Program (CAASASTIP-2018-IAR)
The Natural Science Foundation of China (U1603108)
Article History
Received: 14 March 2018
Revised: 27 September 2018
Accepted: 9 November 2018
First Online: 7 January 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.