1. Belozersky Institute of Physico-Chemical Biology; Moscow State University; Moscow 119991 Russia
2. Institute of Plant Physiology and Biotechnology; University of Hohenheim; Stuttgart 70593 Germany
3. The James Hutton Institute; Dundee DD2 5DA UK
4. Core Facility Hohenheim; Mass Spectrometry Unit; University of Hohenheim; Stuttgart 70593 Germany