诱导根癌土壤杆菌vir区基因表达信号分子的构效研究

以根癌土壤杆菌为介导的外源基因转化系统是目前应用最为广泛和有效的植物基因转化系统。根癌土壤杆菌D质粒毒性区。irA、virB、。irC、。irD。。irE、。irG6个基因位点，在外源诱导性信号分子的作用下，表达出转移DNA（T－DNA）复合物，整合人植物细胞核基因组中。利用根癌土壤杆菌这种天然的转化机制，已获得双子叶转基因植株。但单子叶植物难以被根癌土壤杆菌转化，某些研究者认为这是由于单子叶植物缺乏促使根癌土壤杆菌产生趋化运动以及诱导。ir区基因表达的信号分子［‘」。我们从幼穗分化期至抽穗扬花期水稻中分离获得2种高效…

Structure-activity Research of Signal Factors Inducing Agrobacterium vir Genes

Four rice (Oryza satia L. cv. IR72) signal factors with the functions of inducing Agrobaterium tumefaciens (Smith et Townsend) Conn vir genes were constructed. They were 5, 7, 4'-trihydroxy-3', 5'-dimethoxy-flavone (F1) and its structure analogues F2, F3 and F4. These four signal fartors were detected by Agrobacterium vir:: lzcZ fusion gene system as to compare their functions of inducing virA, virB, virC,virD, virE and virG genes. The structure characters and structure-activity relationship of these signal factors with the best inducing effects to Agrobacterium exogenous gene transformation system were defined which may provide some basic information for foreign gene transformation in rice.