In vitro propagation of a rare and endangered species, Echinosophora koreensis Nakai, by axillary bud culture
2008
Moon, H.K. (Korea Forest Research Institute, Suwon, Republic of Korea), E-mail: [email protected] | Kim, Y.W. (Korea Forest Research Institute, Suwon, Republic of Korea)
An efficient micropropagation was established by using axillary bud explants from two-year-old tree (Echinosphorea koreensis Nakai), which has been known as a rare and endangered species. Among various basal media tested, DKW medium was shown to be the best for axillary shoot elongation. The addition of both BA and TDZ to the medium induced 6 to 10 shoots per explant during eight weeks of culture, without showing any abnormal morphology at the shoot proliferation stage. However, high concentration of TDZ (greater than 0.05 mg/L) appeared to cause hyperhydration on either leaf or shoot at the later developmental stage. Approximately 20% of shoots produced roots by the addition of 1.0 mg/L NAA but not by IBA (0.2~1.0 mg/L). Ex vitro micro-cuttings were better source for root induction; up to 58.6% of the micro-cuttings rooted when 100 mg/L IBA was applied to the soil (vermiculite). More than 90% of plantlets with roots were successfully acclimatized and grew normally in the field. Therefore, we suggest that this endangered tree species can be effectively micropropagated by axillary bud culture system developed in this study.
显示更多 [+] 显示较少 [-]