Acknowledgments
This research was supported by the Fostering Foundation for the Excellent Ph.D. Dissertation of Gansu Agricultural University (YB2018004), and Collaborative Innovation Team Project of Higher Education Institutions in Gansu Province, China (2018C-16), Primary Research and Development Plan of Gansu Province, China (18YF1NA070), and Special Financial Gansu Province, China (GSCZZ-20160909).