## 1 Introduction  
Plants, as sessile organisms, have developed a complex network of signalling molecules that regulate their growth and development in response to external environmental factors [1]. Such plant responses to external factors are mediated by phytohormones and elicitors [2, 3]. Phytohormones are signalling molecules that are produced at low concentrations and regulate all aspects of plant growth and development, such as embryogenesis [4, 5], pathogen protection [6, 7], stress resistance [8, 9], and reproductive development [10, 11]. Depending on the chemical structure, phytohormones are distinguished as auxins, cytokins, ethylene-gibberellins, brassinosteroids, strigolactones, etc. [12]. Unlike phytohormones, elicitors (chitosan, arachidonic acid, benzothiadiazole, bacterial toxins, etc.) are unusual compounds for plant organisms; they enter from the outside and cause a complex of protective reactions in plants [13, 14]. The data on the influence of these chemical compounds on plant organisms depends on the concentration of phytohormones and elicitors used, their localization in plant tissues and organs, and their interactions with other phytocomponents. In the course of ongoing chemical study on the species of _Silene_ genus [15, 16], _S. repens_ Patrin have been selected as the most common species of this genus in the Northern Hemisphere. Botanically, _S. repens_ is an herbaceous plant with numerous simple or branching shoots and stems 15-60 cm long, densely quiescent with short pale hairs. Leaves are linear,linear-lanceolate, or oblong-lanceolate. Inflorescence is raceme, short, and consisting of flowers on short pedicles. Bracts are oval-lanceolate with petals from whitish to yellowish. It grows on dry and steppe meadows and rocky mountain slopes, often almost to the border of the forest in Russia, Mongolia, Japan, and Northeast China [17]. Previously, the chemical composition of _S. repens_ growing in the Baikal region was studied; ecdysteroid and flavonoid profiles of this plant species were investigated [18; 19]. The increased interest in ecdysteroids and phenolic compounds is explained by their high biological activity. Ecdysteroids are plant secondary metabolites that provide protection against phytophagous insects [20]. In mammals, ecdysteroids has demonstrated suppression of neurodegenerative processes, protection of the cardiovascular system, improved activity of the immunological system, and showed antioxidant, antimicrobial, and antiproliferative properties [21; 22]. Flavonoids are also secondary metabolites of plants. According to previous investigations, _S. repens_ contains glycosylflavones [19]. It is known that glycosylflavones possess a wide range of biological activities: hepatoprotective, anti-inflammatory, antiviral, antioxidant properties, etc. [23; 24]. Investigations on the effect of phytohormomes and elicitors on secondary metabolites, such as ecdysteroids and flavonoids, is a promising area. Thus, flavonoid content in seedlings of broccoli was increased by 31% and 33% after treatment by methyl jasmonate and salicylic acid, respectively [25]. Total phenolic and total anthocyanin contents in red lettuce treated with exogenous abscisic acid were significantly higher than in controls [26]. The content of 20-hydroxycedysone in spinach seedlings increased from 8.3 to 24.7 \(\mu\)g/g after the treatment by methyl salicate and reached 17.2 \(\mu\)g/g after treatment by methyl jasmonate [27]. Taking into account information on the effect of exogenous regulators on vegetation and biosynthesis of metabolites of a plant object, it is possible to purposefully change the rates of plants' growth and development, as well as the accumulation of biologically active compounds [28]. This study aimed to estimate the influence of exogenous phytohormones and elicitors on productivity and accumulation of ecdysteroids and glycosylflavones in _S.