Pascal Ganz‡, Toyosi Ijato‡, Romano Porras-Murrilo‡, Nils Stührwohldt§, Uwe Ludewig‡ and Benjamin Neuhäuser‡1 ‡Institute of Crop Science, Nutritional Crop Physiology, University of Hohenheim, 70593 Stuttgart, Germany §Institute of Plant Physiology and Biotechnology, University of Hohenheim, 70593 Stuttgart, Germany ↵1 To whom correspondence should be addressed: Institute of Crop Science, Nutritional Crop Physiology, University of Hohenheim, Fruwirthstr. 20, 70593 Stuttgart, Germany.