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通过农杆菌介导的转基因烟草研究表明 ,棉花曲叶病毒 (CLCuV)外壳蛋白基因 (CP)启动子驱动的GUS基因表达活性不仅存在于韧皮部 ,而且出现在叶肉组织和根尖分生组织中 ;基因枪轰击的瞬时表达研究表明 ,AC2激活后的CP启动子在叶肉及叶脉均有表达活性 ,暗示该启动子为近组成型的启动子。
Studies on Agrobacterium-mediated transgenic tobacco showed that the expression of the GUS gene driven by the CP gene promoter of cotton leaf curl virus (CLCuV) was not only found in the phloem but also in the mesophyll and apical meristems. The transient expression study of gene gun bombardment showed that the CP promoter after AC2 activation expressed both in the mesophyll and veins, suggesting that the promoter is a nearly constitutive promoter.