Acknowledgements
This work was supported by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, Department of Energy (grant no. DE-SC0001685) and the National Science Foundation (Major Research Instrumentation grant no. 0923562). We are grateful to Nerea Ubierna and Joseph Crawford for their valuable inputs on methods of estimation of mesophyll conductance in C4species. We are also grateful to the Core Facility Center “Cell and Molecular Technologies in Plant Science” of Komarov Botanical Institute (St.-Petersburg, Russia) and Franceschi Microscopy and Imaging Center at Washington State University (Pullman, USA) for the use of its facilities and staff assistance. We would also like to thank Charles A. Cody for help in plant growth management.