Funding for this research was provided by:
Key Projects (Advanced Technology) of Jiangsu Province (BE 2019383)
Nationl Natural Science Foundation of China (31671582,31971780)
Jiangsu Collaborative Innovation Center for Modern Crop Production (JCICMCP)
QingHai Project of Transformation of Scientific and Technological Achievements (2018-NK-126)
Xinjiang Crops Great Science and Technology Projects (2018AA00403)
111 Project (B16026)
Received: 22 August 2019
Accepted: 14 September 2020
First Online: 29 September 2020
Ethics approval and consent to participate
: Not applicable.
: Consent and approval for publication was obtained from all authors. Consent for the use of images and manual measurement was obtained from Nanjing Agricultural University.
: The authors declare that they have no competing interests.