Background : A series of studies were conducted to optimize adventitious root induction in vitro from explants of Astragalus membranaceus using various nutrient media supplemented with plant hormones. Methods and Results : Levels of active components were analyzed from adventitious roots induced under different media conditions. Among the different media conditions, Murashige and Skoog medium supplemented with 1.0㎎• ℓ −1 indole-3-butyric acid resulted in the greatest adventitious root induction rate. The amount of the major active component of the adventitious roots of Ama1, calycosin-7-O-β-D-glucopyranoside was higher than that of other adventitious root samples. Conclusions : These results suggest that the adventitious roots of A. membranaceus could be used for the commercial production of medicines.

홍경천의 잎, 줄기, 뿌리 절편을 이용하여 기내 부정근의 생산 체계를 확립하였다. 먼저 홍경천의 잎, 줄기, 뿌리 절편을 0.1, 1.0, 3.0 및 5,0 mg/L의 IBA와 sucrose가 10, 30, 50 및 100 g/L가 첨가된 MS 배지위에 치상하여 부정근의 유도율을 조사하였다. 부정근의 유도는 잎, 줄기 절편에서 IBA의 농도가 5.0 mg/L 일때 가장 높은 유도율을 보였으며, 뿌리 절편은 IBA 3.0 mg/L 첨가된 배지에서 부정근 유도율이 가장 높았다. Sucrose의 농도는 30 g/L가 첨가되었을 때 잎, 줄기, 뿌리 절편에서 높은 유도율을 나타났다. 고체배지 조건에서 부정근의 유도율이 가장 우수한 조건을 기본으로 액체배양을 실시하였으며, 염의 농도에 따른 부정근의 증식조건을 조사하였다. 1/3MS 배지에서 홍경천의 부정근을 배양하였을 때 1/2MS, MS 액체 배지조건 보다 약 2배, 2.5배의 부정근 생장량을 보였다.

An adventitious root formation protocol from Smilax china L. was established for in vitro production of dioscin, a steroidal saponin having various bioactivities such as anticancer, antifungal, antiviral, and antiobesity. Optimal medium for root initiation from leaf explant was MS medium containing 30 g·L-1 of sucrose supplemented with 1.0 mg·L-1 kinetin + 2.0 mg·L-1 NAA. The induction of adventitious roots from in vitro initiated root segments was most favorable to MS liquid medium with 0.1 mg·L-1 kinetin + 2.0 mg·L-1 NAA. Among the 20 different adventitious roots originated from different plants, strain No. 10 was selected based on production ability of dioscin, and its stability through the successive suspension culture. The maximum growth stage of adventitious roots was noticed at 5 weeks after subculture while that of dioscin production in the adventitious root was at 7 weeks after subculture in suspension culture system. These results provide that suspension culture of adventitious roots of Smilax china L. have a potential for in vitro mass production of dioscin.

Scopolamine and hyoscyamine are important anticholinergic compounds obtained from Hyoscyamus niger. Adventitious roots induced from rhizome of H. niger and roots were cultured in SH medium supplemented with 3% (w/v) sucrose and 0.5 mg/L IBA. Roots were grown rapidly after 10 days of cultures. Scopolamine production was increased 7 times and hyoscyamine production was increased 12 times after 10 day of cultures. SH medium was best in root growth. But, highest scopolamine productivity was observed in WPM medium, followed White medium and best hyoscyamine productivity was resulted in MS medium. Sucrose was increased scopolamine and hyoscyamine production were increased the medium supplemented by sucrose comparing to than those by other carbon sources.

Scopolia parviflora Nakai, a rare and endangered species, is the sole plant producing tropane alkaloids (TA) among the Korean native species. In order to enhance TA productivity the SP72 root line was selected by screening 100 of root line, and the optimal culture media for root growth and TA production were investigated with the SP72 roots. Based on the several media, SH and 2B5 medium were determined as growth medium and White and NN medium as production medium. Among the four combinations of two-stage culture, 2BN (2B5 as growth medium plus NN as production medium) showed more enhanced root growth and TA production as compared with production media of White and NN medium and growth media of SH and 2B5 medium, respectively. However, bubble column bioreactor (BCB) cultures applying two-stage culture did not reveal the effective results despite of the each successful operation of two-stage culture in conical flasks and BCB cultures.