D. Vasilev* Department of Plant protection, Botany and Zoology, Faculty of Natural Sciences, Konstantin Preslavski University of Shumen, 115 Universitetska Str., Shumen 9700, Bulgaria (Manuscript received 20 June 2021; accepted for publication 11 November 2022) Abstract. The study too

H. Nedeva*, R. Ivanova, H. Yancheva Crop Science Department, Faculty of Agronomy, Agricultural University, 12 Mendeleev, 4000 Plovdiv, Bulgaria (Manuscript received 20 May 2016; accepted for publication 6 June 2016) Abstract. The aim of the study was to establish the amount of plastid