Indolyl acetic acid (IAA) is a biologically active substance that mitigates the effects of stress factors such as drought and salinity in plants. It is known that microorganisms in the microbiome of halophytic plants synthesize biologically active substances, including IAA, to ensure the development of the host plant under conditions of stress factors. K. ceratoides is a haloxerophytic plant that grows in saline and arid conditions. Analysis of scientific sources showed that the microorganisms in the endomicrobiome of this plant, their characteristics and potential applications in practice have not been studied. This article presents the results of experiments aimed at determining the effects of temperature, salinity and pH on IAA synthesis in promising strains of endophytic bacteria isolated from the plant K. ceratoides. Analysis of the results showed that temperature, salinity and pH affected IAA synthesis in the studied strains. Among the strains, the presence of strains that retain the ability to synthesize ISK at a high level even under the influence of stress factors, the fact that they have a positive effect on the level of germination and some biometric parameters of wheat seeds under salinity conditions, substantiates the possibility of using these strains in the development of promising agrotechnologies.