백합나무의 체세포배 유도에 미치는 ABA, 환원질소원 및 삼투압제 효과
Effects of ABA, reduced nitrogen source and osmoticum for somatic embryogenesis in Liriodendron tulipifera
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본 연구는 백합나무 배발생조직으로부터 체세포배 유도에 영향하는 ABA (abscisic acid)의 농도, 환원질소원 및삼투압제의 종류 및 농도 효과를 조사하기 위해 수행되었다. ABA농도 비교에서는 0.5 mg/L 첨가구에서 가장 높은 체세포배 유도 수 (640/10 mg 조직)를 보였으나 0.5mg/L 이상의 농도에서는 점차 체세포배 발생 수는 감소하는 경향을 보였으며, 20 mg/L 농도에서 가장 낮은 유도수 (250/5 mg 조직)를 나타냈다. 8종류 환원질소원 종류및 농도에 대한 체세포배 유도 효과를 비교한 결과 최대체세포배 유도는 500 mg/L casamino acid (223/5 mg 조직)첨가구에서 나타났으나, 그 외 환원질소원 종류 및 농도에 따라 매우 다양하게 나타났다. 삼투압제 종류 및 농도비교에서는 최고의 체세포배 발생 수 (317/5 mg 조직)는4% sucrose 첨가 시 나타났으나 maltose 첨가배지에서는농도에 상관없이 체세포배가 전혀 유도되지 않아 삼투압제 종류에 따라 큰 차이를 보였다.
Abstract
This study was conducted to evaluate effects of various kinds or concentrations in abscisic acid (ABA), reduced nitrogen sources (casein hydrolysate, casamino acid and L-glutamine) and osmoticum for production of somatic embryos (SEs) from pro-embryogenic mass (PEM) in yellow poplar (Liriodendron tulipifera). In comparison of various concentrations of ABA, the highest number (640/10 mg PEM) of SEs was marked in the treatment of 0.5 mg/L. With higher concentration than 0.5 mg/L ABA, number of induced SEs were decreased. And the lowest number of SEs were obtained from the treatment of 20 mg/L ABA. Differences of 8 treatments of the nitrogen sources in the medium were also compared. In the experiment of 8 treatments for SEs production, the highest result showed in the treatment of 500 mg/L casamino acid (223/5 mg PEM). In comparison of different kinds/concentrations of osmotica for SEs induction, the best response was obtained from the treatment of 4% sucrose (317/5 mg PEM). In contrast, no SEs were found from the treatments supplemented with any concentrations of maltose.
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