Funding for this research was provided by:
National Natural Science Foundation of China (21705087)
Distinguished Scholars of Qingdao Agricultural University (6631117015)
Article History
Received: 23 May 2017
Accepted: 14 November 2017
First Online: 22 November 2017
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
Free to read: This content has been made available to all.