Multiple Shoot Induction on the New Cltivar, Saxifraga fortunei 'Greenstar' by Different Media and Plant Growth Rregulators

This study was conducted to develop in vitro propagation techniques of new cultivar, 'Greenstar', bred by Highland Agriculture Research Center. The multiple shoot induction and plant growth of in vitro plant were analyzed by MS media concentration (1/2 MS, 1 MS and 2 MS medium), plant growth regulators and its proper concentration; CPPU [Forchlorfenuron(N-(2-chloro-4-pridyl)-3-phenylurea) (0, 0.5, 1.0 and $2.0mg{\cdot}L^{-1}$), thidiazuron [(TDZ), (0.01, 0.1, 0.5 and $1.0mg{\cdot}L^{-1}$), zeatin (0, 0.5, 1.0 and $2.0mg{\cdot}L^{-1}$), and BA [6-benzylaminiopurine(BA), (0, 0.5, 1.0 and $2.0mg{\cdot}L^{-1}$)] in MS (3% sugar and 0.8% agar with pH 5.7) media. The highest number of induced shoots, leaves and roots were shown in 1/2 MS medium concentration. On the 1/2 MS medium, shoot numbers, shoot length, leaf numbers and root numbers were 11.0, 1.9 cm, 24.7, and 8.0, respectively. On the absence of CPPU in the 1/2 MS medium, shoot length and root numbers was greater than CPPU treatment, but the highest number of shoots was induced by the $2.0mg{\cdot}L^{-1}$ of CPPU concentration in 1/2MS medium. TDZ, zeatin, and BA treatments were not effective on the induction of multiple shoot in vitro culture. As a result, in vitro culture of new Saxifraga fortunei, 'Greenstar' with $2.0mg{\cdot}L^{-1}$ of CPPU in 1/2 MS medium was most effective for the rapid multiplication.

배지 및 생장조절제 종류를 이용한 바위떡풀 신품종 '그린스타' 의 다신초 유도

바위떡풀의 기내 배양시 MS배지의 농도별로 12주간 배양한 결과 1/2 MS 배지에서 신초길이 1.9 cm, 엽수 24.7매, 뿌리수 8.0개, 신초수 절편당 11.0개로 1 MS나 2 MS 배지에 비해 효과적이었다. 1/2 MS배지를 기본으로 하여 생장조절제를 첨가하여 8주간 배양한 결과 CPPU 농도처리시 신초길이와 뿌리수는 무처리구에서 많았으나 신초수에 있어서는 농도가 높아질수록 많아져 $2.00mg{\cdot}L^{-1}$ 농도 처리구에서 8.2개로 가장 많아 증식에 유리한 것으로 나타났으나 TDZ, zeatin과 BA처리는 무처리에 비해 처리효과가 없는 것으로 나타났다. 그러므로 바위떡풀을 조직배양 방법을 이용하여 대량증식 시키고자 할 때에는 생장점을 초대배양(MS배지)한 후 신초를 CPPU $2.00mg{\cdot}L^{-1}$ 을 첨가한 1/2 MS배지에 치상하여 다신초를 발생시킨 후 다시 신초를 하나씩 분리하여 1/2 MS배지에 계대하여 배양한 후 순화하면 다량의 식물을 획득할 수 있을 것으로 생각된다.