T. Dinev1*, I. Gospodinov2, A. Stoyanova3, G. Beev1, D. Dermendzhieva4, D. Pavlov3 1Department of Biochemistry, Microbiology and Physics, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Agricultural Institute, 6000 Stara Zagora, Bulgaria 3Department of Plant Pr