芦笋果聚糖:果聚糖6-果糖基转移酶基因Ao6G-FFT序列特征及达模式研究

来源 :植物生理学报 | 被引量 : 0次 | 上传用户:javaname40
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为分析芦笋(Asparagus officinalis)果聚糖合成关键基因功能特征,本研究以二倍体芦笋为供试材料,基于RT-PCR技术克隆果聚糖:果聚糖6-果糖基转移酶基因Ao6G-FFT,并通过生物信息学方法分析基因、启动子和氨基酸序列特征,通过qRT-PCR方法研究芦笋Ao6G-FFT基因在非生物胁迫处理下的表达情况.研究发现,Ao6G-FFT基因的cDNA及其基因组序列全长分别为1812 bp和17351 bp,基因组序列包含6个内含子和7个外显子,编码含有603个氨基酸残基的亲水性蛋白,并含有一个跨膜螺旋区和一个典型的信号肽结构.启动子区域(ATG上游约2 kb)含有TATA-box等保守元件外,还存在大量与非生物胁迫和激素诱导响应的元件.组织特异表达分析表明,该基因在不同组织器官中均有表达,但贮藏根等地下部组织器官中基因表达量显著高于地上部分.qRT-PCR分析表明,Ao6G-FFT基因受到冷胁迫、干旱胁迫、脱落酸和茉莉酸甲酯诱导表达,推测该基因可能参与芦笋逆境胁迫应答.
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