This study was supported by grants from the China Scholarship Council (CSC201206350022) and the European Union's Seventh Framework Programme (FP7/2007-2013) within the project OPTIMISC under grant agreement No. 289159. We are grateful to Dr. Kai-Uwe Schwarz from the Julius Kühn Institute in Braunschweig for providing plant material, Florian Busch and Sören Wanja Wansel for their help in establishing the experiments, and Benedikt Prechter from the Institute of Physics and Meteorology (120), University of Hohenheim, for providing the weather data. We would also like to thank Dr. Jens Möhring for his assistance in data analysis and Nicole Gaudet for the language editing of this manuscript.