1. Chair of Crop Science and Plant Biology Institute of Agricultural and Environmental Sciences Estonian University of Life Sciences Fr. R. Kreutzwaldi 5 Tartu 51006 Estonia
2. Department of Biodiversity and Conservation Biology Swiss Federal Institute for Forest, Snow and Landscape Research WSL Zürcherstrasse 111 Birmensdorf 8903 Switzerland
3. Department of Botany Institute of Ecology and Earth Sciences University of Tartu Lai 40 Tartu 51005 Estonia
4. Estonian Academy of Sciences Kohtu 6 Tallinn 10130 Estonia