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番茄SlPP2C67启动子克隆及表达分析

Cloning and Expression Analysis of SlPP2C67 Promoter from Solanum lycopersicum

  • 摘要: 番茄(Solanum lycopersicum)PP2C67基因(SlPP2C67)是番茄蛋白磷酸酶2C基因家族的重要成员。本研究以‘Micro-Tom’番茄为材料,采用PCR方法克隆SlPP2C67 1 657 bp启动子序列。启动子顺式作用元件分析表明该启动子除含有CAAT-box与TATA-box等基本调控元件外,还包含多个组织特异表达元件、光响应元件和激素响应元件。用克隆的启动子同向置换pCAMBIA1300-GN载体上的CaMv35S启动子来构建重组表达载体,然后转化拟南芥(Arabidopsis thaliana)进行功能验证。GUS组织化学染色结果表明,SlPP2C67启动子驱动GUS基因在拟南芥叶片特异性表达。实时定量PCR结果表明SlPP2C67基因主要在番茄叶片表达,该结果与SlPP2C67启动子驱动的GUS基因在拟南芥中的表达结果一致。本研究为后续开展SlPP2C67基因的功能研究和番茄遗传改良提供理论依据。

     

    Abstract: Solanum lycopersicum PP2C67 gene(SlPP2C67) is an important member of protein phosphatase 2C gene family. In this study, the 1 657 bp promoter sequence of SlPP2C67 was cloned from ′Micro-Tom′. Analysis of cis acting elements of the promoter indicates that SlPP2C67 promoter contained basic regulatory elements, such as CAAT-box and TATA-box, and it also contained multiple tissue specific expression elements, light responsive elements and hormone responsive elements. CaMv35S promoter in pCAMBIA1300-GN vector was replaced by the cloned promoter to construct recombinant expression vector that was transformed into Arabidopsis thaliana for functional verification. GUS histochemical staining showed that the promoter of SlPP2C67 could drive GUS gene to express in A. thaliana leaves specifically. The results of real-time quantitative PCR showed that SlPP2C67 was mainly expressed in tomato leaves, which was consistent with the results of GUS gene expression driven by SlPP2C67 in A. thaliana. This study provides a theoretical basis for further functional research of SlPP2C67 and genetic improvement of tomato.

     

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