## 1 Introduction  
One of the most important requirements for obtaining high-quality planting material is the creation of conditions for the speedy healing of the site of rootstock and scion grafting. Violations in the fusion of the grafting components can cause improper development of seedlings and subsequent culling. As a rule, they are caused by non-compliance with technology use recommendations and methods of inoculation, as well as damage to the tissues of the inoculation components by phytopathogens. About 15-20% of all grafted plants do not take root due to impaired fusion at the grafting site; therefore, the search for and application of various methods to improve the quality and speed of grafting components is a popular and urgent task.  
It is worth noting that various physical methods are now widely used in the treatment of agricultural crops. Such methods include magnetic field treatment and exposure to microwave radiation and others that affect the physiological and biochemical processes in seeds and plants and thereby contribute to greater vegetative growth and increased yield and crop quality [1, 2].  
One of the potential ways to improve the intergrowth of rootstocks and scions may be treatment with low-temperature plasma or plasma-activated water. It is known that low-temperature plasma and plasma-activated water are actively used to deactivate bacteria. Recently, a large number of studies have appeared on the practical application of low-temperature plasma and plasma-activated water in various fields of science--medicine, veterinary medicine and agronomy [3, 4, 5, 6, 7, 8, 9, 10]. When working with living objects, low-temperature plasma is mainly used in which the rotational temperature of the ions affecting living objects does not exceed 40 \({}^{\circ}\)C [11]. Such a plasma is called cold atmospheric plasma (CAP). CAP is essentially an ionized gas with a low temperature of neutral particles and ions but a high temperature of electrons [12].  
The effect of cold plasma on living objects is mainly mediated by reactive oxygen species (ROS) and reactive nitrogen species (RNS) [13]. Under the influence of CAP, a large number of different chemical reactions occur. The main reagents are hydrogen peroxide, superoxide radicals, hydroxyl radicals, hydroperoxyl radicals, singlet oxygen, nitric oxide, peroxynitrite, among many others [14]. The lifetime of these compounds is often very short; for example, the lifetime of the hydroxyl radical is about 1 ns, and that of the superoxide radical is about 1 \(\upmu\)s [15]. Long-lived compounds include hydrogen peroxide, ozone, and a number of RNS [16]. Obviously, most of the reactive oxygen species act on living objects only at the time of operation of the plasma generator. The plasma-treated solutions (PTSs) contain long-lived active forms and products of their interaction with each other and with other compounds contained in water [17; 18]. There are various ways to obtain CAP and PTS: based on a dielectric barrier discharge, glow or corona discharge, using various types of gases or operating in atmospheric air [19]. There is no information in the literature about the use of CAP in the grafting of plants. In this paper, for the first time, we study the effects of CAP during the winter grafting operation on cherry cultures created by a dielectric barrier discharge (DBD) and PTS created using glow discharge plasma. The optimal characteristics of the impact were determined: the duration of CAP and the concentration of PTS.