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棉花GaMYB7和GbGLU基因启动子的克隆和初步功能验证
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摘要
棉花是第一大天然纤维产物,在世界纺织工业中具有重要的经济地位。随着人们生活水平的提高和纺织技术的进步,也对棉纤维品质提出了更高的要求。而阐明纤维发育的细胞和分子机理,发现改良棉纤维的靶基因,是改良纤维品质的基础。研究这些棉花纤维特异基因的启动子既有助于进一步明确该基因的功能,也为基因工程的研究打下了基础。
     棉花黄萎病(Verticillium spp)是棉花生长过程中最具破坏力的病害之一,在世界范围内流行。在我国,棉花黄萎病是棉花生产的主要障碍之一。使用棉花黄萎病病原诱导的启动子来介导抗病基因的表达,不仅会获得目的产物、达到预定目标,而且也不会产生副作用。植物抗病相关启动子的调控特性研究、分离及其应用对于提高植物抗病性极其关键。
     本研究选取了两个目标基因,棉花花和纤维特异表达基因GaMYB7和棉花黄萎病诱导表达基因GbGLU,克隆了这两个基因的启动子序列,具体工作如下:
     (1)通过筛选江陵中棉BAC文库的方法,得到了含有GaMYB7基因的阳性单克隆,以此作为TAIL-PCR的起始模板,获得的总长度1566bp的GaMYB7基因上游序列。经过序列分析确定了转录起始位点(TSS)、TATA box和CAATbox。通过序列分析发现,该序列包含多个光调控元件,还具有生长素和赤霉素应答的基本结构。在此基础上,构建了3个5'端启动子片段驱动GUS基因的植物表达载体。通过基因枪转化棉花胚珠瞬时表达实验发现,三个启动子片段均能指导报告基因在棉花胚珠中正常表达。TM-1棉花0DPA胚珠离体诱导实验表明,GaMYB7基因的表达受GA_3和IAA浓度的影响,10uMIAA时,GaMYB7基因的表达量最高;但是过高浓度的GA_3会抑制GaMYB7基因的表达。在20001x的光照强度下诱导处理棉花胚珠发现,与暗处理相比,早期(10天之前)光照处理可以有效提高GaMYB7基因的表达量;后期(10天之后)反而会抑制GaMYB7基因的表达。因此,GaMYB7启动子可用于研究棉花纤维的发育、品质改良以及外源基因在棉花纤维中的特异表达。
     (2)通过筛选陆地棉遗传标准系TM-1 BAC文库,得到了GbGLU基因的阳性单克隆,以此作为TAIL-PCR的起始模板,分离了GbGLU基因5'侧翼序列,总长度为1357bp。PLACE分析表明,该序列含有TATA box和CAAT box,还有病原菌诱发子反应元件W-box、GT-1、MYB、MYBST1等。将GbGLU基因5'侧翼序列以不同的缺失与GUS基因融合构建了3个植物表达载体。通过农杆菌介导转化棉花胚性愈伤发现,三个启动子片段均能指导报告基因在棉花愈伤中表达。GbGLU启动子能否用于棉花抗黄萎病的转基因研究还需进一步实验证明。
Promoter can control foreign gene's expression feature:where,when or how much.Constitutive promoter,which drives the foreign gene expressed in all plant organs and throughout the plant developmental period,is widely used in plant genetic engineering studies now.This may squander the plant nutrient and energy and results in increased metabolism burden of the plant.We can control foreign gene's expression if we instead the constitutive promoter by a fiber-specific promoter or a disease inducible promoter in cotton genetic engineering.
     In this study,we try to isolate a cotton fiber-specific gene(GaMYB7) promoter and a Verticillium dahliea induced up-regulation expression gene(GbGLU) promoter.
     The mainly result includes two sections:
     The ordered array of the pooled BAC clones was screened and the BAC clones containing the GaMYB7 gene were identified.With the BAC-DNA serving as template for the first round of TAIL-PCR,we successfully obtained a sequence 1566 base pairs in length upstream of the ATG start codon of the GaMYB7 gene.Cis-acting element prediction results showed the basic sequence structure was consisted of identified putative core promoter elements and other upstream promoter elements, including light response elements,auxin and gibberellin response elements.The effects of GA_3,IAA and light on GaMYB7 expression in fiber cells were studied by in vitro cotton ovule culture and real-time fluorescent quantitative PCR.The results showed that GaMYB7 expression could be significantly induced by 10uM IAA,5uM GA_3 and 10d light treatment,respectively.In transient assays with cotton ovules cultured in vitro,both this promoter sequence and a series of tnmcations could drive theβ-glucuronidase reporter gene(GUS) specifically in ovules and fibers.Therefore, the promoter is considered to be a useful expression element for deep researches on molecular mechanisms of cotton fiber development,modification of fiber quality and expression of foreign genes in fiber.
     We also identified the BAC clones containing the GbGLU gene from upland cotton genetic standard line TM-1 BAC library screening and isolated a sequence 1357 base pairs in length upstream of the ATG start codon of the GbGLU gene, successfully.Several cis-acting elements,including W-box,GT-1 box,ARE,BOX4, as-2-box,3-AF1 binding site,Root-motif elements,were recognized with the aid of PLACE program.Four different regions of the promoter sequence of the GbGLU gene were fused to theβ-glucuronidase(GUS) coding region.In Agrobacteriummediated transient expression assay,the transcriptional activations of the promoter deletions were examined in cotton embryogenic callus.
引文
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