AGRICULTURAL BIOLOGY, 2015, V. 50, ¹ 5, pp. 579-589 Plant epigenetics doi: 10.15389/agrobiology.2015.5.579rus doi: 10.15389/agrobiology.2015.5.579eng ANALYSIS OF EPIGENOMIC AND EPIPLASTOME VARIABILITY IN THE HAPLOID AND DIHAPLOID SUGAR BEET ( S.I. MALETSKII, S.S. YUDANOVA, E.I. MALETSKAYA Federal Agency of Scientific Organizations, 10, pr. <...> There is a direct proportional relationship between the genome level ploidy, the cytoplasm volume and the cell size (nuclear-plasma ratio). <...> Variation of chromosome or chromatid numbers in the cell nuclei determines the epigenomic variability and variation of intracellular organelle numbers in the cell (for example chloroplasts) determines epiplastome variability in plants. <...> Relationship of the chloroplast number in stomata guard cells and nucleus ploidy level in sugar beet is well known that permit to compare an epiplastome variability in plants and different ploidy of genomes. <...> However the epiplastomic variability is related not only with a random organelle distribution during cytokinesis, but also with a genome number variation per cell nucleus (epigenomic variability). <...> An endohaploidy, i.e. an appearance of haploid cells in cell population, is one of the variant of epigenetic variability display. <...> In the work the diploid (control, generation A0), dihaploid and haploid (generation A1) seed progeny were used. <...> In the paper we considered a variability of chloroplast number in stomata guard cells and integral tissue characteristics which are compared with harmonious proportions (Fibonacci number, golden ratio). <...> It was studied following parameters: a) a chloroplast number in stomata the guard cells; b) a plastotype number in the epidermal tissue. <...> And it was determined the average value of chloroplast (M) and plastotypes (Pt) number in stomata guard cells of haploid, diploid and dihaploid plants. <...> It was established for the first time that integral tissue characteristic (D-ratio) corresponds to harmonious proportions (bio-logical invariants), i.e. Fibonacci numbers (golden ratio). <...> In diploids and dihaploids this ratio corresponds to the first terms of the harmonious series (from first to fifth), in haploids D-ratio corresponds to eighth and higher terms of the harmonious sequence. <...> The daughter nuclei produced in cariokinesis are usually the copies of the parent cell while exact distribution of organelles between daughter cells is impossible. <...> Variability in cell populations may occur due to the volatility in the chromosome number (mixoploidy <...>