1. Laboratory of Plant Physiology and Molecular Genetics, Université Libre de Bruxelles, Bd du Triomphe, B‐1050 Brussels, Belgium
2. Department of Plant Systems Biology, VIB, Technologiepark 927, B‐9052 Ghent, Belgium
3. Department of Plant Biotechnology and Genetics, Ghent University, Technologiepark 927, B‐9052 Ghent, Belgium
4. Department of Molecular and Laser Physics, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, the Netherlands