Acknowledgements
This work was supported by Interreg Upper Rhine (Vitifutur) co-financed by the European Union/European Regional Development Fund (ERDF), the German Federal Agency for Agriculture (Programme for Sustainable Agriculture, BÖLN), and by a fellowship from the China Scholarship Council to Dong Duan and Ruipu Wang. Hao Wang is acknowledged for kindly providing the FABD2-GFP actin-marker line.