作物学报 ›› 2016, Vol. 42 ›› Issue (03): 368-375.doi: 10.3724/SP.J.1006.2016.00368
杨江涛,庞伟民,王旭静*,吕少溥,唐巧玲,王志兴
YANG Jiang-Tao,PANG Wei-Min,WANG Xu-Jing,LÜ Shao-Pu,TANG Qiao-Ling,WANG Zhi-Xing
摘要:
在基因工程发展中,有应用前景的纤维特异表达启动子的缺乏是制约棉花纤维品质改良的主要因素之一。本研究利用反向PCR的方法克隆到陆地棉纤维优势表达基因GhRACK1的上游启动子GhRACK1-P。GhRACK1-P全长为1987 bp,含有TATA-box、CAAT-box、MYB2和I-box等顺式作用因子和调控元件。根据调控元件的分布对GhRACK1-P进行不同程度的缺失,获得了p1、p2、p3和p4缺失体;构建不同缺失体和全长GhRACK1-P的植物表达载体并通过农杆菌介导法导入烟草,获得不同类型转基因烟草。GUS组织化学染色结果表明,全长启动子GhRACK1-P只能驱动gus基因在转基因烟草的幼根及根毛中表达,其它缺失体驱动gus基因在转基因烟草的花粉、叶片和根中表达,为组成型表达启动子。由于根毛与棉花纤维具有相似的发育机理,推测全长GhRACK1-P可能为纤维优势表达启动子。研究结果为棉花纤维品质改良基因工程提供了新的调控元件。
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