Abstract

Drought stress is the most significant factor that reduces crop yield and is used as a drug. Using materials such as a plant growth regulator (Brassinosteroids) is a practical solution to reduce losses. Brassinosteroids steroidal plant compounds are broad biological activities that are able to increase plant performance through changes in plant metabolism and in protecting them against environmental stress. In a greenhouse study that was carried out in Vocational City Center Arsanjan, the impact of three levels of irrigation: field capacity (FC), mild stress (FC2/3) and severe stress (FC1/3) and four concentrations of plant growth regulators: Article 28-Homobrassinolid zero, M 10^-10, 10^-8 M and 10^-6 M digits on some savory characters of Satureja bachtiarica was investigated. The results showed that reducing irrigation to reduce the significant effect it has on growth parameters, including length and root dry weight, stem diameter, branch number, plant height, shoot yield and total yield, was essential. More so, the concentration of 10^-8 M 28-Homobrassinolid that was significantly used to increase root dry weight, stem diameter, branch number, plant height, total yield and performance was also essential. Percentage oil increased significantly at 1% by reducing irrigation so that 36% oil in full irrigation increased to 87% in severe stress, and 10^-8 M was recorded for the use of hormone. Essential oil yield at 5% level under the influence of irrigation and the use of hormones were the most essential functions related to irrigation and the use of 10^-8 M 28-Homobrassinolid and value 32/29 kg/ha, respectively. The relationship of these hormone levels in full irrigation, mild and severe stress significantly increased by 59, 30 and 24% oil yield respectively than the control plants did.

Key words: Drought stress, Brassinosteroids, essential oil percentage, shoot yield.