Funding for this research was provided by:
National Natural Science Foundation of China (31701738)
National Key Basic Research Program of China (2013CB127701)
Special Fund for Agro-scientific Research in Public Interest (201303016)
Received: 30 March 2019
Accepted: 10 September 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: All samples in this study were obtained from public areas that no specific permissions were required for these locations. Fields sites are public access and <i>Bgt</i> is not an endangered or protected species.
: Not applicable.
: The authors declare that they have no competing interests.