L. Dospatliev1*, M. Lacheva2 1Department of Pharmacology, Animal Physiology and Physiological Chemistry, Faculty of Veterinary Medicine, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Botany, Faculty of Agronomy, Agricultural University, 4000 Plovdiv, Bulgaria (Manuscri

P. Yankov1*, M. Nankova2, M. Drumeva1, D. Plamenov1, B. Klochkov2 1Department of Plant Production, Faculty of Marine Sciences and Ecology, Technical University Varna, 1 Studentska, 9010 Varna, Bulgaria 2Dobrudzha Agricultural Institute, 9520 General Toshevo, Bulgaria Abstract. The inv