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An in vitro approach to the production of rosmarinic acid (RA), a medicinally important caffeic acid ester, in a cell suspension culture (CSC) of Satureja khuzistanica Jamzad (Lamiaceae) has been investigated for the first time. The CSC was established from friable calli derived from shoot tip explants in Gamborg's B5 liquid medium supplemented with 30 g/L sucrose, 20 mg/L L-glutamine, 200 mg/L casein hydrolysate, 5 mg/L benzyladenine (BA) and 1 mg/L indole-3-butyric acid (IBA). The effect of nitrogen source (KNO 3 and (NH 4 ) 2 SO 4 ) and their different concentrations on the fresh and dry weight (g/L), as well as RA content (mg/g dry weight)were measured. CSC growth measurements indicated a maximum specific cell growth rate of 1.5/day, a doubling time of 7.6 days and a high percentage of cell viability (96.4 %) throughout the growth cycle. Maximum cell fresh weight (353.5 g/L), dry weight (19.7 g/L) and RA production (180.0 mg/g) were attained at day 21 of culture. Cell growth and RA content were affected by nitrogen deficiency. Media containing 8.3 mM of total nitrogen ( of B5 standard medium) led to a minimum cell fresh weight (243.0 g/ L), dry weight (17.4 g/L) and RA content (38.0 mg/g) after 21 days. The established CSC provided useful material for further optimization experiments aimed at a large-scale production of RA.

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Medicinal and aromatic plants (MAPs) are used in pharmaceutical, food, cosmetic, and other industries as a source of secondary metabolites. Using MAPs and natural substances is one of the most important factors in ensuring human health. Dracocephalum kotschyi Boiss (locally called Badrandjboie-Dennaie or Zarrin-Giah) is a perennial aromatic plant belonging to the Lamiaceae family, native to Central Asia and Iran, where it usually grows in the highlands of Golestan,