In the rhizosphere of cereals the is one of the most common objects to study associative interactions becells form effective association and demonstrate a stimulating effect on plant growth and development, in particular in wheat. <...> However, the details of these positive effects are still unknown. <...> For example, there is no evidence of whether the cells are infected with bacteriophages, and little is known about the role that the bacteriohages of soil microorganisms can play in the development of associative relationship between microorganisms and plants. <...> Nevertheless, the bacteriophages are well known to control the bacteria number in the population and be involved in genetic transduction. <...> Note that the studied bacteriophages are mostly isolated from environment, in particular, from soil, while the bacteriphages of associative soil bacteria still remain poorly studied. <...> To evaluated changes in the morphology of the wheat ( inoculation with from these cells, we first inoculated the 3-day old wheat seedlings with Sp7 L.) root system in Saratovskaya 29 variety after Sp7 bacterial cells and bacteriophage FAb-Sp7, isolated Sp7 at 108, 106, 104 cells per 1 ml. It resulted in a decrease in the length of the root, and the number of lateral roots grew considerably at 102 cells per 1 ml. After treatment wiht bacteriophage FAb-Sp7 an average number of roots remained unchanged. <...> It was shown that wheat seedling inoculation with suspension resulted in a 3-fold decrease in root elongation zone, and the suction zone and reduced 1.5 times. <...> Treatment of wheat seedlings with a suspension containing phages resulted in a 3.3-fold decrease in the tensile zone, but the root hair zone remained unchanged. <...> Using confocal microscopy we demonstrated that incubation of wheat seedlings with hairs (on average by 40 %) compared with the control. <...> In natural conditions, they can colonize both the surface and internal tissues of plant roots, mainly in cereals [2-4], and formation of these symbioses increases cereal productivity [5-8]. <...> As to Sp7, in the 1990s, the presence of strain cells on the root surface only was demonstrated in a series of studies [3-4, 9]. <...> A multifactorial positive effect of the 315 bacteria on plant growth, development and productivity is known. <...> In this regard, high nitrogenfixing activity, production of indole-3-acetic acid and other plant hormones, are among the most common objects family capable of assimilatat 102 cells per 1 <...>