摘要
来源于水稻 (OryzasativaL .)的一个 82 0bp多拷贝重复序列RRD3 ,含有植物启动子TATA_box、CAAT_box等特征保守基元。用RRD3取代Ti载体pBI12 1中的CaMV 35S启动子 ,通过植物转化鉴定RRD3的启动子功能。组织化学分析表明 ,根癌土壤杆菌 (Agrobacteriumtumefaciens (SmithetTownsend)Conn)LBA44 0 4转化后的烟草 (Nico tianatabacumL .)再生植株和水稻愈伤组织都显示了gusA基因的表达 ,并且发现转基因烟草茎端组织的GUS活性比其他部位强。这些结果提示RRD3在转化的植物中行使了启动子功能 ,该DNA片段中启动子核心功能序列的确定正在进行中。
A 820 bp rice ( Oryza sativa L.) repetitive DNA sequence, the RRD3, was cloned by annealing kinetics. From the sequence analysis, there are several conserved promoter motifs in the sequence such as TATA_box, CAAT_box, etc. In order to detect the promoter function of RRD3, RRD3 was inserted into Ti plasmid pBI121 to replace the CaMV 35S promoter DNA fragment. Both transgenic tobacco ( Nicotiana tabacum L.) G28 and rice callus showed the β_glucuronidase (GUS) activity by histochemical assays, the GUS activities of the transgenic tobacco were primarily localized at or around the vascular tissue in leaf and stem. These results indicated that RRD3 can exercise promoter function. The core sequence of promoter of RRD3 will be located.
基金
国家"8 6 3"项目!(BH_0 1_0 2_0 2_0 3)
广东省自然科学基金!(990 2 5 8)&&
