植物在逆境胁迫下大量基因的表达往往会发生改变,最终导致对逆境的诱导抗性。剖析逆境作用下差异表达基因的功能是阐明植物抗逆分子机制的重要途径,而获得逆境作用下差异表达基因的全长cDNA是上述研究的基础。建立获得辣椒应答疫霉侵染差异表达基因全长cDNA的技术平台:利用抑制性差减杂交技术构建辣椒叶片在疫霉侵染下的SSH文库,随机挑取150个克隆测序,获得24个功能已知的序列,BLASTN分析发现这些差异表达基因从功能上可分为能量代谢过程、信号传递、光合作用、抗逆反应等几种类型;利用DSN(duplex-specific nuclease)均一化技术与SMARTTM(switching mechanism at 5’end of RNA transcript)建库技术相结合的方法,构建了辣椒全长均一化cDNA文库,该文库含有1.8×106个独立克隆,插入片段平均长度为1.75kb,重组率为97%;基于SSH获得的差异表达基因序列设计特异性引物,从均一化文库中分离获得其相应的cDNA,结果表明:所获得的差异表达基因cDNA片段相对应的cDNA阳性克隆均为全长cDNA,所构建的SSH和均一化cDNA文库可较好地应用于辣椒应答疫霉等逆境差异表达基因全长cDNA的分离,为进一步开展差异表达基因的功能鉴定奠定基础。
More and more evidences showed that plant secondary metabolites had various biological functions, and among these functions, the chemical ecological functions of plant secondary metabolites and its effects on quality of plant products had been attached great attention. The plant secondary metabolic pathways were regulated by enzymes in multiple points along the pathways and for a specific kind of secondary metabolite, its biosynthesis pathway existed as metabolic channels. The metabolic pathways could be modified by gene addition, gene knockout and engineering of transcription factors or regulating genes to enhance or reduce the production of specific secondary metabolites in order to boost the stress resistance of plants or to improve the quality of plant products. Fig 1, Ref
