Funding for this research was provided by:
the National Key R & D Program of China (2016YFD0600106, 2019YFD1000500)
the National Key Program on Transgenic Research (2018ZX08020002-003-004)
the Modern Agricultural Industry Technology System Innovation Team of Shandong Province of China (SDAIT-02-05)
the National Natural Science Foundation of China (31700524, 31870576, 31871625)
the Agricultural Variety Improvement Project of Shandong Province (2019LZGC009)
Received: 6 February 2020
Accepted: 6 April 2020
First Online: 20 April 2020
Ethics approval and consent to participate
: This study does not contain any research requiring ethical consent or approval.
: Not applicable.
: The authors declare that they have no competing interests.