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Identification and Functional Characterization of the CVOMT and EOMT Genes Promoters from Ocimum Basilicum L


 Methyl chavicol and methyl eugenol are important phenylpropanoid compounds previously purified from basil. These compounds are significantly enhanced by the water deficit stress-dependent mechanism. Here, for the first time, pObCVOMT and pObEOMT promoters were extracted by the genome walking method. They were then cloned into the upstream of the β-glucuronidase (GUS) reporter gene to identify the pattern of GUS water deficit stress-specific expression. Histochemical GUS assays showed in transgenic tobacco lines bearing the GUS gene driven by pObCVOMT and pObEOMT promoters, GUS was strongly expressed under water deficit stress. qRT-PCR analysis of pObCVOMT and pObEOMT transgenic plants confirmed the histochemical assays, indicating that the GUS expression is also significantly induced and up-regulated by increasing density of water deficit stress. This indicates these promoters are able to drive inducible expression. The cis-acting elements analysis showed that the pObCVOMT and pObEOMT promoters contained dehydration or water deficit-related transcriptional control elements.