Acknowledgments
This work was supported by grants from the National Natural Science Foundation of China (31572136, 31372061), Development Fund Project of Fujian Agriculture and Forestry University (CXZX2016158, CXZX2017548). The authors thank Mark D. Curtis for kindly providing the Gateway destination vectors and Dr. S. P. Dinesh-Kumar of Yale University for the pTRV1 and pTRV2 vectors.