Funding for this research was provided by:
National Natural Science Foundation of China (No. 31201959)
Shaanxi Province Agricultural Science and Technology Innovation and Research Project (2016NY-116)
Fundamental Research Funds for the Central Universities (2452015036 and 2452015322)
Text and Data Mining valid from 2019-01-31
Received: 29 March 2018
Accepted: 23 January 2019
First Online: 31 January 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article contains no studies with human participants or animals performed by any of the authors.