Funding for this research was provided by:
National Natural Science Foundation of China (31240011)
Natural Science Foundation of Shandong Province (BS2011NY09)
the Youth Scientific Research Foundation of Shandong Academy of Agricultural Sciences (2014QNM05)
Text and Data Mining valid from 2019-08-24
Received: 17 February 2019
Accepted: 13 August 2019
First Online: 24 August 2019
Compliance with ethical standards
: Not applicable.
: The authors declare that they have no competing interests.