Correlation Between GL6 Expression Driven by Varied Promoters and Development of Epidermal Hairs on Leaves of Rice Plant
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摘要:
目的 研究水稻茸毛发育机制及相关基因的功能与调控模式,为深入研究相关基因功能及其在生产上的应用提供理论支撑。 方法 从不同水稻品种中克隆叶片表皮毛发育相关基因GL6的启动子序列,并将具有显著表皮毛特征的突变体品种75-1-127的GL6基因启动子与叶表无显著表皮毛特征的野生型品种相应基因的启动子序列进行比对,同时克隆突变体品种75-1-127中GL6基因的CDS序列,并分别构建以玉米泛素蛋白Ubiquitin和花椰菜花叶病毒CaMV35S为启动子驱动的过表达载体,以农杆菌介导的方法转化野生型粳稻品种Kitaake。 结果 不同品种中克隆的启动子序列区存在显著的序列差异,以玉米泛素蛋白Ubiquitin启动子驱动的过表达载体获得的转基因水稻出现了显著的表皮毛特征,以花椰菜花叶病毒CaMV35S为启动子驱动的过表达载体的转基因水稻则未出现典型的表皮毛特征。 结论 目标基因GL6的表达调控受启动子的影响,突变体品种75-1-127的叶表皮毛发育特征是因启动子区序列差异所致。 Abstract:Objective Being one of the important agronomic traits that reflect the yield and physiological functions of a rice plant, the growth and photosynthesis of the fine hairs on the surface of rice leaves were studied. Method The sequences of GL6 gene promoters relating to leaf epidermal hair development were obtained and cloned from different rice varieties. That of Mutant 75-1-127 showing the characteristic epidermal hair development was compared with those of the wild type rice lacking it. The CDS sequence of the mutant gene was cloned. Then, the maize Ubiquitin and cauliflower mosaic virus CaMV35S were used as promoter-driven overexpression vectors to transform the wild-type Japonica rice, Kitaake, mediated by Agrobacterium. Result There were significant differences on the sequences in regions of the genes regulated by the promoters and cloned from different cultivars. The leaves of transgenic rice plants with GL6 driven by maize Ubiquitin promoter had significant hairy phenotype of the typical velvet appearance, but not those involved CaMV35S as a promoter. Conclusion It was clearly demonstrated that the promoters affected the expression of the target gene GL6 and that the epidermal hair development on leaves of Mutant 75-1-127 was derived by the promoter with a unique sequence. -
Key words:
- rice /
- promoter /
- gene expression /
- leaf epidermal hair development
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图 4 不同启动子驱动下的转基因植株叶片表皮毛表型
注:A和B: CaMV35S启动子驱动GL6转化Kitaake叶片上下表面扫描电镜观察;C和D:Ubiquitin启动子驱动GL6转化Kitaake叶片上下表面扫描电镜观察。
Figure 4. Phenotype of transgenic plants driven by CaMV35S promoter (A&B) or Ubiquitin promoter (C&D) as observed under SEM on adaxial and abaxial sides of leaf of Kitaake
Note:A&B: SEM observation on the adaxial side and the abaxial side of the leaf between KitaakeGL6trangneic driven by a CaMV35S promoter (A&B)and Kitaake-GL6trangneic driven by a Ubiquitin promoter(C&D).
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