Funding for this research was provided by:
the earmarked fund for China Agriculture Research System (CARS-10-B21)
National Key R&D Program of China (2016YFE0133600)
Article History
Received: 7 March 2018
Accepted: 19 June 2018
First Online: 28 June 2018
Compliance with Ethical Standards
:
: The authors declare that they have no competing interests.