1. Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, Moscow, 127276 Russia
2. Department of Biology, Universidad Autonoma de Madrid, 28049 Madrid
3. Umeå Plant Science Centre, Department of Plant Physiology, University of Umeå, S-901 87 Umeå, Sweden
4. Institute of Microbiology, Russian Academy of Sciences, Prospect 60-Letiya Oktyabrya 7/2, Moscow, 117312 Russia