1. Department of Plant Physiology, Institute of Biology, Martin-Luther-University Halle-Wittenberg , D-06120 Halle (Saale) , Germany
2. Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Interactions Arbres-Microorganismes (IAM), Université de Lorraine , F-54000 Nancy , France
3. Department of Plant Physiology, Umeå Plant Science Centre, Umeå University , S-90187 Umeå , Sweden
4. Department of Organelle Biology, Biotechnology and Molecular Ecophysiology, Max-Planck-Institute of Molecular Plant Physiology , D-14476 Potsdam-Golm , Germany