Abstract:
KEY MESSAGE:A plant-derived 0.3 kb constitutive promoter was obtained from AtTCTP expression analysis, and successfully applied to the expression of a selectable marker gene for production of transgenic creeping bentgrass plants. The isolation and use of an efficient promoter is essential to develop a vector system for efficient genetic transformation of plants, and constitutive promoters are particularly useful for the expression of selectable marker genes. In this study, we characterized a small size of the constitutive promoter from the expression analysis of Arabidopsis thaliana translationally controlled tumor protein (AtTCTP) gene. Histochemical and fluorometric GUS analyses revealed that a 303 bp upstream region from the start codon of the AtTCTP gene showed strong GUS expression throughout all plant tissues, which is approximately 55 % GUS activity compared with the cauliflower mosaic virus 35S promoter (35Spro). To examine the possible application of this promoter for the development of genetically engineered crops, we introduced pCAMBIA3301 vector harboring the 0.3 kb promoter of AtTCTP (0.3kbpro) that was fused to the herbicide resistance BAR gene (0.3kb pro ::BAR) into creeping bentgrass. Our transformation results demonstrate that transgenic creeping bentgrass plants with herbicide resistance were successfully produced using 0.3kb pro ::BAR as a selectable marker. Northern blot analysis revealed that the transgenic plants with 0.3kb pro ::BAR showed reduced but comparable expression levels of BAR to those with 35S pro ::BAR. Moreover, the transcription activity of the 0.3 kb promoter could be increased by the fusion of an enhancer sequence. These results indicate that the 0.3 kb AtTCTP promoter can be used as a plant-derived constitutive promoter for the expression of selectable marker genes, which facilitates its use as an alternative to the 35S promoter for developing genetically engineered crops.
journal_name
Plant Cell Repjournal_title
Plant cell reportsauthors
Han YJ,Kim YM,Hwang OJ,Kim JIdoi
10.1007/s00299-014-1705-5subject
Has Abstractpub_date
2015-02-01 00:00:00pages
265-75issue
2eissn
0721-7714issn
1432-203Xjournal_volume
34pub_type
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journal_title:Plant cell reports
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journal_title:Plant cell reports
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journal_title:Plant cell reports
pub_type: 杂志文章
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journal_title:Plant cell reports
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journal_title:Plant cell reports
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