Biologia plantarum 60:667-676, 2016 | DOI: 10.1007/s10535-016-0637-z

Functional analysis of the Malus domestica MdHMGR2 gene promoter in transgenic Arabidopsis thaliana

D. M. Lv1, T. T. Zhang1, S. Deng1, Y. H. Zhang1,*
1 State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, P.R. China

The first rate-limiting enzyme of the mevalonate pathway during isoprenoid biosynthesis is 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR). In this study, the expression pattern of the MdHMGR2 gene in Malus domestica suggests that MdHMGR2 was expressed in a tissue-specific manner and was significantly induced by ethephon (ETH), indoleacetic acid (IAA), methyl jasmonate (MeJA), and salicylic acid (SA). The MdHMGR2 promoter was isolated, sequenced, and analyzed through bioinformatics tools, and the results suggest the presence of various putative cis-acting elements responsive to different hormones. Activity of β-glucuronidase (GUS) driven by the full length MdHMGR2 promoter and its 5'deletion fragments was detected in transgenic Arabidopsis thaliana. A strong GUS activity was observed in seedlings, roots, newly growing true leaves, anthers, and stigmas in transgenic Arabidopsis containing the full MdHMGR2 promoter. The results indicate that a region from -1050 to -827 was crucial for promoter activity. In addition, the MdHMGR2 promoter was induced in response to ETH, IAA, MeJA, and SA. The analysis suggests that an ethylene-responsive element in the region from -1050 to -1005 was required for the ethylene inducibility.

Keywords: abscisic acid; apple; cis-acting element; ethylene; gibberellin; β-glucuronidase; indoleacetic acid; methyl jasmonate; salicylic acid
Subjects: gene promoter; gene expression; abscisic acid; ethylene; gibberellic acid; auxin; methyl jasmonate; salicylic acid; GUS activity; apple
Species: Malus domestica; Arabidopsis thaliana

Received: June 10, 2015; Revised: December 8, 2015; Accepted: January 18, 2016; Published: December 1, 2016Show citation

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Lv, D.M., Zhang, T.T., Deng, S., & Zhang, Y.H. (2016). Functional analysis of the Malus domestica MdHMGR2 gene promoter in transgenic Arabidopsis thaliana. Biologia plantarum, 60(4), 667-676. doi: 10.1007/s10535-016-0637-z.
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