ACKNOWLEDGEMENTS
This work was supported by the National Key Research and Development Program of China (2019YFD1001105, 2018YFD1000500), the Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences (1630052021026), Hainan Provincial Natural Science Foundation of China (320MS097), and the Natural Science Foundation of China (31701484). We are grateful to Dr. Hongwei Guo and Dr. Kang Yan for providing plasmids 6xMS2 and MSCP.