Studies on the Transformation of Crop Plants. IV. Biochemical Characteristics of Embryogenic Callus in Rice

곡물류의 형질전환 유도에 관한 연구 (IV) 벼 배발생 세포의 생화학적 특징

Rice (Oryza saliva L.) calli containing both embryogenic callus (EC) and non embryogenic callus (NEC) regions were initiated from the mature seed on MS medium supplemented with 2.0 mg/L 2,4-D, 0.5 mg/L kinetin. The calli were developed into two callus type which can be distinguished by visual examination depending on color and appearance. In order to illucidate the polypeptide composition between EC and NEC, the total protein extracted from two types of callus was analysed by electrophoresis. By one-dimesional anlaysis of SDS-PAGE and Isoelectric focusing, several protein bands showed quantitative and qualitative difference in each type of callus. The further analysis of the total protein with two-dimensional electrophoresis showed at least 20 EC specific protein and 10 NE specific protein. Also 3 specific protein spots showing micro heterogeneity of 90, 65, 50 kD were detected in EC, while a series of acidic heterologous protein spots were visualized in NEC.in NEC.

벼(Oryza sativa L.) 캘러스는 2.0 mg/L 2,4-D와 0.5 mg/L kinetin이 첨가된 MS 배지에서 성숙종자로부터 유도되었으며 embryogenic callus(EC)와 nonembryogenic callus(NEC)는 색깔과 외부형태에 의해 경시적으로 선별되었다. EC와 NEC의 전체 단백질로부터 SDS-PAGE와 등전점 전기영동에 의한 전기영동적 분석은 EC와 NEC의 각각에 대해 특이적, 양적인 차이를 보여주었다. 또한 EC와 NEC의 2차원 전기영동 분석은 약 20여개 이상의 EC 특이단백질과 10여개의 NEC 특이 단백질 양상을 보여주었으며, 아울러 EC 특이적인 90, 65, 50 kD의 단백질은 microheterogeneity를 보여주는 반면, NEC에서는 분자량의 변이가 큰 일련의 산성 이질단백질군을 보여주었다.