Transformation of Chinese Cabbage (Brassica rapa L. ssp.pekinensis) by Agrobacterium Micro-Injection into Flower Bud

We obtained two lines of Chinese head cabbage (Brassica rapa L. ssp. pekinensis) selfed progenies containing both an anti-sense gene of BcpLH and a gene for resistance to kanamycin by micro-injecting buds of their primary transformants (T0) with Agrobacterium tumefaciens strain LBA4404. 31 positive plants resistant to kanamycien were recovered. Southern blot analysis confirmed the presence of T-DNA in two transgenic plants. One (DHZ-13-1) exhibits the characteristics of out-toward rosette and cauline leaves, and nested flower model in which secondary complete flower developed from the base of the primary ovary and the third flower from the ovary in the secondary flower, and so on, while another(DHZ-6-1) has no phenotype change. ABA and IAA affected the root growth of progeny of DHZ-13-1, but 6-BA was insensitive to hypocotyl growth during its seedling development.     

结球白菜反义BcpLH基因转化株幼苗对生长激素的反应

4种浓度的植物生长素处理苗期的结球白菜反义BcpLH基因转化株后发现, IAA处理的转化株叶色变淡,叶片外卷.激素浓度在0 ～ 0.01 mmol·L-1和1.0～10.0 mmol·L-1两个区域时,转化株和非转化株的叶形指数略有增加,而在0.01～1.0 mmol·L-1范围内,两者的叶形指数均呈下降趋势,表明IAA在此浓度范围内,叶肉细胞沿主叶脉方向的纵向生长受到的抑制强于横向生长所受到的抑制.虽然0.1 mmol·L-1以上浓度的IAA对转化株和非转化株的叶柄生长都具有抑制作用,但与非转化株相比,转化株的反应较为迟钝.对非转化株的下胚轴生长有不同作用的IAA拐点浓度是0.01 mmol·L-1,而转化株的拐点浓度是1.0 mmol·L-1.IAA对转化株和非转化株的主根生长都有促进作用,但转化株对IAA的敏感性弱于非转化株.