Funding for this research was provided by:
Hainan Provincial Natural Science Foundation of China (618QN220)
the Agricultural Science and Technology Innovation and Public Relations project of Shaanxi Province of China (2016NY-176)
the Fundamental Research Funds for the Central Universities of Shaanxi Normal University (GK201703054, GK201603083, GK201703058)
the Key Science and Technology Innovation Team in Shaanxi Province of China (2014KTC-18)
National Natural Science Foundation of China (61373120)
Article History
Received: 13 December 2018
Revised: 24 October 2019
Accepted: 20 December 2019
First Online: 1 August 2020