This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Abstract To investigate optimal conditions for plant regeneration in Platycodon grandiflorum (Jacq. A. DC.).Both leaf and hypocotyl explants were cultured on Murashige& Skoog's (MS) medium supplemented with combinations of 0.1, 0.5, 1.0, or 2.0 mg/L cytokinins (BA and kinetin) and 1.0 mg/L 2,4-D for 6 weeks, respectively. According to the type of explant, the total shoot organogenesis (56.38%) in leaf explants was higher than in hypocotyls (28.20%). In comparison with kinetin and BA for the plant regeneration, the frequency (70.38%) of leaf explants was higher in combination with kinetin and 2,4-D than of BA with 2,4-D (42.38%), whereas the frequency (35.56%) of hypocotyls explants was higher in BA combination than kinetin combination (20.83%). Thehighest frequency (94.20%) was observed from the cultures of leaf explants on the MS medium supplemented with 1.0 mg/L kinetin and 1.0 mg/L 2,4-D. Upon transfer onto
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