Appropriate in Vitro Culture Conditions of Growing Medium for New Ever-bearing Strawberry 'Goha'

사계성 신품종 딸기 '고하'의 기내배양을 위한 배지의 적정 조건

This study was carried out to determine suitable in vitro culture conditions of new ever-bearing strawberry ($Fragaria$ $ananassa$ Duch.), 'Goha'. Four-week old plantlets which were derived from the meristem culture were used in this study. Three different culture media including MS, Gamborg B5 and White medium were used for the plant culture and the medium concentrations were at the 5 levels of $1/3{\times}$, $1/2{\times}$, $1{\times}$, $2{\times}$ and $3{\times}$. Sucrose content ranged at four levels of 1, 3, 5 and 8% (w/v). Crown diameter on the MS medium was thicker (2.1 mm) than in other media. Fresh weight on the MS medium was 482 mg, which was heavier than 88 mg or 260 mg of Gamborg B5 or White medium, respectively. Particularly, 1/2MS medium was found to have higher growth rate than these in other treatments (fresh weight, dry weight and D/F rate). Shoot length in the treatment of 1% sucrose concentration was 3.6 cm which was the longest. Shoot length was in inverse proportion to the increasing concentration of sucrose. Fresh weight was increased up to 3% sucrose concentration, but decreased above 5% sucrose concentration. From the results, we found that the best condition for in vitro culture of new ever-bearing strawberry 'Goha' was 1/2MS medium supplemented with 1% sucrose concentration.

본 실험은 신품종 사계성 딸기 '고하'의 무병주 생산을 위해 기내배양 시 적정조건을 구명하고자 실시하였다. 식물 재료로는 생장점 배양 후 4주된 유식물체를 이용하였다. 배지 종류는 MS배지, Gamborg B5배지 및 White배지 등 3종류를 사용하였다. MS배지 농도는 1/3배, 1/2배, 1배, 2배, 3배 농도 등 5처리, sucrose 농도는 1, 3, 5 및 8% (w/v) 등 4처리를 두었다. 배지 종류별 실험 결과, MS배지의 관부직경이 2.1mm로 가장 굵었다. 생체중은 MS배지가 482mg으로 Gamborg B5배지의 394mg과 White배지의 222mg에 비해 88g, 260g 각각 더 무거웠다. MS배지 1/2배 처리가 생체 중, 건물중, D/F율 등의 생육량이 다른 농도에 비해 높았다. 초장은 sucrose 1%에서 3.6cm로 가장 길었으며, 농도가 높아질수록 점점 짧아지는 경향을 보였다. 생체중은 sucrose 3% 농도까지 증가하다가 5%이상에서는 감소하는 경향을 보였다. 따라서 사계성 딸기 '고하'의 기내배양 시 1/2 MS 배지에 sucrose 1%을 첨가하는 것이 가장 적합한 것으로 판단되었다.