数字农科院2.0

Isolation and Activity Evaluation of Callus-Specific Promoters in Rice (Oryza sativa L.)

文献类型： 外文期刊

作者： Ma, Xiaojiao;Wu, Chuanyin

作者机构：

关键词： callus;specific promoter;GUS reporter gene;genetic transformation;gene editing;rice

期刊名称： GENES

ISSN：

年卷期： 2025 年 16 卷 5 期

页码：

收录情况： SCIE（2025版）

摘要： Background/Objectives: In crop genetic engineering, morphogenic genes have attracted increasing attention, given their ability to facilitate the transformation of a broad range of otherwise nontransformable cultivars. However, few callus-specific promoters have been identified to date that can be employed to avoid the adverse effects resulting from the ectopic expression of morphogenic genes on shoot regeneration and growth. Methods: A set of potential callus-specific genes were initially selected based on publicly available data. These genes were then screened using quantitative real-time polymerase chain reaction (qPCR), followed by promoter activity evaluation using a transgenic approach with the GUS gene serving as a reporter. Results: Of the 24 evaluated promoters, 12 were verified as being callus-specific using qPCR. Five genes (Os11g0295900, Os10g0207500, Os01g0300000, Os02g0252200, and Os04g0488100) were chosen, and their promoters were cloned. Based on GUS staining, the pOsTDL1B (Os10g0207500) promoter showed strong callus-specific expression, pOsEDC (Os01g0300000) was a medium-level callus-specific promoter, and pOsDLN53 (Os02g0252200) was strictly callus-specific, although its activity was low. Quantification of GUS activity indicated that all three pOsTDL1B:GUS transgenic lines exhibited strong callus specificity relative to the various tissues tested. Conclusions: A callus-specific promoter was identified that can be used to drive the expression of morphogenic genes in crop transformation.

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