Laboratory of Physiology, Department of Botany, University of Liège, Sart Tilman, B-4000, Liège, Belgium.
Plant Physiol. 1976 Apr;57(4):632-9. doi: 10.1104/pp.57.4.632.
The onset of RNA synthesis in primary roots of germinating Zea mays embryos was studied. Incubation of excised embryos in the radioactive precursor solution was performed after different germination periods.It was observed that there are three successive stages in the reactivation of RNA synthesis. Stage one is characterized by the synthesis in the chromatin of heterodisperse nuclear RNA rich in adenine. Stage two is characterized by the synthesis of heterodisperse nuclear RNA in the chromatin and 2.3 x 10(6) rRNA precursor in the nucleolus. Stage three is characterized by the synthesis of heterodisperse nuclear RNA and rRNA precursor and by the processing of the latter in mature rRNA.
本文研究了萌发玉米胚胎初生根中 RNA 合成的起始。将切下的胚胎在放射性前体溶液中孵育不同的萌发时间后进行。结果表明，RNA 合成的重新激活有三个连续的阶段。第一阶段的特征是富含腺嘌呤的异质分散核 RNA 在染色质中的合成。第二阶段的特征是染色质中异质分散核 RNA 的合成和核仁中 2.3 x 10(6) rRNA 前体的合成。第三阶段的特征是异质分散核 RNA 和 rRNA 前体的合成，以及后者在成熟 rRNA 中的加工。
