Funding for this research was provided by:
National Natural Science Foundation of China (NSFC 31372363)
The earmarked fund for Modern Agro-industry Technology Research System (CARS-35-05)
The National Basic Research Program (973 program) in China (2014CB138705)
Received: 3 July 2017
Accepted: 17 January 2018
First Online: 30 January 2018
Consent for publication
: Not applicable.
: The authors declare that they have no competing interests.
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