Effects of Dessication, Sucrose and Salt Stress on the Regeneration of Portulaca oleracea Cultured Cells

건조, 염분 및 탕의 처리가 쇠비름(Portulaca oleracea L.) 배양세포의 재분화에 미치는 영향

The optimal level of growth regulator for callus initiation stem explants was BAP 0.1mg/L combined with 2,4-D 1.0 mg/L in Murashige and Skoog (MS) medium supplemented with 30g/L sucrose and 10g/L agar, and that for cell growth was BAP 0.1+2,4-D 0.5 mg/L in MS liquid medium. The regeneration frequency of P. oleracea cells was significantly increased by subjecting the cells to dessication for 1and 2 h up to 83%, respectively, as compared with untreated control showing 61%. Cell viability and survival rate was inhibited by pretreatment of 0.6% NaCl for 2 days, while regeneration ability was not affected by the treatment. Pretreatment of 100g/L sucrose for 2 days markedly stimulated the regeneration of cells up to 81%. These results suggest that in addition to physiological changes, water stress resulted from dessication and high concentration of sucrose and NaCl is closely related to the regeneration of P. oleracea cultured cells.

쇠비름(portuaaca oleracea L.)의 줄기절편체로부터 캘러스유도를 위한 적정배지는 BAP 0.1 + 2,4-D 1.0 mg/L., 30g/L sucrose 및 10 g/L agar를 첨가한 MS배지로 나타났으며, 액체배양에 의한 세포의 증식에는 BAP 0.1 + 2,4-D 0.5mg/L가 함유된 MS배지가 효과적이었다. 장시간 건조처리는 세포는 활력과 재생 및 재분화율이 강하게 억제되나, 1시간 및 2시간동안의 단시간 건조처리한 세포의 재분화율은 각각 83및 80%로 나타나나 무처리 61%에 비해 높았다. 0.6% NaCl의 2일간 전처리는 세포의 재분화율에는 영향을 미치지 않으나, 세포활력 및 재생률에는 억제작용을 나타내었다. Sucrose 70및 100 g/L를 전처리한 쇠비름세포의 재분화율은 각각 80및 81%로 무처리에 비해 높았다.