抗菌肽cecropin B和兔NP-1融合基因转化鱼腥草的研究

目的:将抗菌肽cecropin B和兔NP-1(CN)融合基因转入鱼腥草,培育鱼腥草基因工程新品种。方法:设计并合成抗菌肽融合基因CN,构建重组质粒pBI121-CN,并转入农杆菌LBA4404,以农杆菌介导法转化鱼腥草外植体,将卡那霉素筛选获得的再生抗性植株以快速筛选PCR法进一步筛选阳性植株,再提取基因组DNA进行PCR-Southern鉴定,RT-PCR分析目的基因在鱼腥草中的表达,以大肠杆菌K12抑菌圈实验和立枯丝核菌感染实验分析转基因鱼腥草抗菌能力。结果:抗菌肽基因已整合到转基因鱼腥草基因组中并表达,表现出抗菌能力增强的性状。结论:以抗菌肽融合基因CN转化鱼腥草,初步获得抗菌活性提高的转基因植株。

Transformation of antimicrobial peptide fusion gene of cecropin Band rabbit NP-1 to Houttuynia cordata

Objective : To transform the antimicrobial peptide fusion gene of cecropin B and rabbit NP-1(CN) into Houttuynia cordata to improve its antimicrobic capability. Method : The fusion gene of CN designed and synthesized artificially was recombined with expression vector pBI121. The recombined vector was transformed to Agrobacterium tumefaciens LBA4404, by which CN gene was transformed to the explants of H. cordata. The transgenic regeneration plantlets were selected by kanamycin and rapid screening PCR. The transgenic plants were identified by PCR-Southern of genomic DNA and RT-PCR. The disease resistances were detected by antibacterial zone trail of leaf extracts to E. coli K12 and infection by Rhizoctonia solani. Result : Gene of interesting CN was inserted into genomic DNA and expressed in transformed H. cordata, whose resistance to E. coli K12 and Rh. solani was stronger than that of the non-transformed control. Conclusion : The fusion gene CN can improve antimicrobic capability of transformed H. cordata.