Biologisches Institut II, Universität Freiburg, Schänzlestraße 9-11, D-7800, Freiburg i. Br., Federal Republic of Germany.
Planta. 1975 Jan;124(2):215-7. doi: 10.1007/BF00384765.
Cotyledons of mustard (Sinapis alba L.) seedlings irradiated with far-red light were shown to synthesize high molecular weight precursor rRNA (2.4×10(6)-2.9×10(6) dalton) at a considerably enhanced rate compared to dark-grown cotyledons. This result was obtained by pulse-labelling cotyledons isolated from 48 h old seedlings (which were either irradiated for 12 h with standard far-red light before dissection, or kept in darkness) with [(3)H]uridine for 15 min. The data verify the conclusion that phytochrome is able to activate the transcription of rRNA cistrons.
远红光照射的芥菜（Sinapis alba L.）幼苗子叶以相当高的速度合成高分子量前体 rRNA（2.4×10(6)-2.9×10(6)道尔顿），与黑暗中生长的子叶相比。这一结果是通过用 [(3)H]尿嘧啶核苷对离体 48 小时幼苗的子叶进行脉冲标记 15 分钟获得的（这些子叶要么在解剖前用标准远红光照射 12 小时，要么在黑暗中保存）。这些数据证实了光敏色素能够激活 rRNA 顺式基因转录的结论。
