1. Institute of Dendrology, Polish Academy of Sciences , Parkowa 5, Kórnik 62-035, Poland
2. Department of Plant Physiology and Biotechnology, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University , Lwowska 1, Toruń 87-100, Poland
3. Faculty of Forestry and Wood Technology, Poznan University of Life Sciences , Wojska Polskiego 71a, Poznan 60-625, Poland