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An efficient and rapid in vitro propagation system for Satureja avromanica, a rare and endangered folk medicinal plant of Iran was developed through the shoot tip and leaf disc explants. Nodal and leaf explants from wild plants were established on MS and WPM media supplemented with BA, BAP and TDZ (0, 0.1, 0.5, 1, 1.5, 2, 5 and 10 mgl(-1)) alone or by application of BA and TDZ (0, 2, 5 and 10 mgl(-1)) in combination with IBA and 2,4-D (0, 0.1, 0.5 and 1 mgl(-1)), respectively. Based on results, the highest mean shoot number (6.21) was obtained on MS medium supplemented with 2 mgl(-1) BA. Regarding the shoot elongation, MS supplemented with 2 mgl(-1) TDZ and MS containing 5 mgl(-1) BA showed the longest shoots (4.82 and 4.39 cm, respectively) after 6 weeks of culture. As a matter of fact, increasing all three tested cytokinins levels led to enhancement of explant response frequency and regenerated shoot number. On the other side, WPM medium supplemented with 0.1 mgl(-1) IBA was found suitable for rooting of regenerated shoots. RAPD molecular analysis revealed genetic stability of in vitro raised plants. In conclusion, individual application of BA, BAP and TDZ were in favor of S. avromanica direct shoot regeneration while treatment media with a combination of IBA and BA as well as 2,4-D and TDZ resulted in callogenesis in most explants. Finally, the in vitro raised plantlets were acclimatized and successfully established in the greenhouse conditions. Our developed protocol can be employed for the large-scale micropropagation and conservation of S. avromanica as a threatened medicinal plant.

In vitro propagation and conservation of Satureja avromanica Maroofi—an indigenous threatened medicinal plant of Iran