1. Faculty of Mathematics and Natural Sciences, Institute for Ecosystem Research, Division of Geobotany, Kiel University , D-24118 Kiel , Germany
2. Faculty of Agricultural and Nutritional Sciences, Institute for Human Nutrition and Food Science, Division of Food Technology, Kiel University , D-24118 Kiel , Germany
3. Department of Agriculture, Ecotrophology and Landscape Development, Anhalt University of Applied Sciences , D-06406 Bernburg (Saale) , Germany
4. Institute of Plant Science and Microbiology, University of Hamburg , D-20146 Hamburg , Germany