采用农杆菌介导的遗传转化技术, 将Bt基因cry1Ab导入三系恢复系明恢63获得了一批抗虫性及农艺性状较好的转基因纯合株系。研究中, 进一步检测了这些纯合株系的拷贝数、Bt蛋白含量、抗虫性及主要农艺性状。结果显示: 5个转基因纯合株系均为单拷贝; 纯合株系T_1Ab-10及其杂种的Bt蛋白含量最高; 人工接虫和自然感虫试验中, T_1Ab-10对二化螟、三化螟和稻纵卷叶螟均表现高度抗性; 喷药试验中, 阳性植株与阴性植株、对照植株的主要农艺性状均没有显著差异。这说明转cry1Ab基因纯合株系T_1Ab-10具商品化潜力, 可作基因聚合材料。

Gene cry1Ab was transformed into Minghui 63 (Oryza sativa L.) via Agrobacterium and several homozygous transgenic lines were obtained. In this study, the copy numbers, Bt protein contents, insect resistance, and main agronomic traits of these lines were examined. All these lines had single-copy number of cry1Ab through Southern blotting analysis. The line T_1Ab-10 and its hybrid expressed the higher Cry1Ab proteins than any other lines and their corresponding hybrids when assayed by ELISA. After artificial infestation of first-instar YSB (Yellow stem borer) and natural affection of stemborers and leaffolders, the line T_1Ab-10 showed high insect-resistant to these insects. Field trial displayed that, under the pesticide-applying condition, there was no statistical difference between the negative plants of T_1Ab-10 and control cultivar Minghui 63. These results indicate that the transgenic line T_1Ab-10 has the potential for commercialization and gene stack-ing.