[Features of Clonal Micropropagation of Silene cretacea (Caryophyllaceae) in in vitro Culture].

The features of the formation of microshoots in in vitro culture of Silene cretacea­endangered species with narrow ecological amplitude, which is a promising source of medicinal raw materials­were studied. It was demonstrated that, at the micropropagation step, basic Woody Plant Medium containing vitamins according to Murashige and Skoog and supplemented with 0.2 mg/L 6-benzylaminopurine, 1.0 mg/L kinetin, 1.0 mg/L gibberellic acid, and 0.5 mg/L indole-3-acetic acid is the most effective. The combination and concentration of these growth regulators, selected using mathematical combinatorial analysis, activated axillary buds and provided a high multiplication factor (9.3 ± 1.3 microshoots per explant). Morpho-histological analysis revealed the main stages of the formation of microshoots and proved the absence of callus formation during the whole time of the cultivation of explants. The features of the dynamics of the culture during the year of continuous cultivation are presented.

[Genetic polymorphism of Tulipa gesneriana L. evaluated on the basis of the ISSR marking data].

Using the method of ISSR analysis, the genetic diversity of 18 natural populations of Tulipa gesneriana L. from the north of the Lower Volga region was examined. The ten ISSR primers used in the study provided identification of 102 PCR fragments, of which 50 were polymorphic (49.0%). According to the proportion of polymorphic markers, two population groups were distinguished: (1) the populations in which the proportion of polymorphic markers ranged from 0.35 to 0.41; (2) the populations in which the proportion of polymorphic markers ranged from 0.64 to 0.85. UPGMA clustering analysis provided subdivision of the sample into two large clusters. The unrooted tree constructed using the Neighbor Joining algorithm had similar topology. The first cluster included slightly variable populations and the second cluster included highly variable populations. The AMOVA analysis showed statistically significant differences (F CT = 0.430; p = 0.000) between the two groups. Local populations are considerably genetically differentiated from each other (F ST = 0.632) and have almost no links via modern gene flow, as evidenced by the results of the Mantel test (r =­0.118; p = 0.819). It is suggested that the degree of genetic similarities and differences between the populations depends on the time and the species dispersal patterns on these territories.