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核农学报  2014 

鸭梨果胶甲酯酶基因反义表达载体的构建及转化

DOI: 10.11869/j.issn.100-8551.2014.04.0597, PP. 597-604

Keywords: 鸭梨,果胶酯酶,反义表达载体,转化

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Abstract:

果胶酯酶(pectinmethylesterase,PME)催化细胞壁中多聚半乳糖醛酸的脱甲酯化,可以降解植物细胞壁中的果胶多糖而与果实软化有关。本研究根据白梨果胶酯酶基因PcPME4的序列,设计一对含有特定酶切位点的特异性引物,以鸭梨(PyrusbretschneideriRehd.)cDNA为模板通过PCR扩增得到一段294bp的PME基因片段。将片段反向插入植物表达载体pBI121的CaMV35S启动子和NOS终止子之间,经限制性酶切分析和测序分析证明成功构建PME基因的反义表达载体pBI121-AsPME。将pBI121-AsPME电转化农杆菌EHA105,利用含pBI121-AsPME的农杆菌工程菌液侵染鸭梨外植体后于抗性培养基中诱导愈伤组织,获得的抗性愈伤组织经PCR初步检测含有反向PME基因片段,荧光定量PCR检测结果显示受侵染的愈伤组织中PME基因表达量降低,表明反向插入的PME基因片段起到了抑制内源基因表达的效果。

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