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RNA干涉AtSUS3影响拟南芥SUS家族表达模式及角果成熟

DOI: 10.1360/052011-36, PP. 615-625

Keywords: 蔗糖合成酶,RNA干涉,代偿效应,拟南芥,角果

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Abstract:

蔗糖合成酶(SuSy)是植物蔗糖代谢的关键酶,在植物生长发育过程中起着重要作用.为研究拟南芥中SUS3的功能,构建RNAi-SUS3干涉载体,通过农杆菌介导的真空渗透法转化拟南芥.筛选获得纯系转基因植株后,对AtSUS家族进行表达分析,利用环境扫描电子显微镜观察转基因植株表型,并对转基因拟南芥角果进行木质素组织化学染色以及透射电子显微镜检测.结果表明,RNA干涉技术能够抑制AtSUS3的表达,正常培养条件下该基因沉默后对拟南芥的表型没有显著影响,但可引起角果中AtSUS1,AtSUS2和AtSUS4表达代偿性增加,使转基因植株角果内果皮层细胞次生细胞壁增厚,木质化程度加深,同时果瓣厚度也有增加趋势.结果提示,转基因拟南芥角果的发育较野生型植株更为优先,AtSUS3基因沉默可能有利于角果的成熟.

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