biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 65:60-67, 2021 | DOI: 10.32615/bp.2020.141

Cloning and functional analysis of the promoter of the sesquiterpene synthase gene ASS1 in Aquilaria sinensis

Y.H. XU1, F.F. LV2, P.W. SUN1, M.H. TIAN1, J.H. WEI1, 2, *
1 Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education; Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100193, P.R. China
2 Hainan Branch of the Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Haikou 570311, P.R. China

Agarwood, the resin part of Aquilaria spp., is valued in medicine, perfumes, and incense. The most important components of agarwood are sesquiterpenes, which are produced only when a healthy tree is wounded. Agarwood sesquiterpene synthase 1 (ASS1) is one of key enzymes responsible for the biosynthesis of sesquiterpenes in Aquilaria sinensis (Lour.) Gilg, and it is a typical wound-inducible synthase. To elucidate its regulatory mechanism at the transcriptional level, a 978-bp sequence upstream of the translation initiation codon ATG of the promoter for ASS1 was cloned. Computational analysis revealed that this promoter contained many known cis-elements including several defense related transcriptional factor-binding boxes. To functionally validate the promoter, a 5' truncated fragment fused with the β-glucuronidase (GUS) reporter gene was used for generating stable transgenic Arabidopsis plants. The spatial and temporal expression patterns of GUS in transgenic Arabidopsis showed that the promoter of ASS1 was induced by mechanical wound and mainly expressed in vascular bundles. Subcellular localization showed that ASS1 localized in the nucleus and plasma membrane. Here, identification of the ASS1 promoter not only lays a foundation for studying its transcriptional regulation, but also provides clues for studying the synthesis mechanism of agarwood sesquiterpenes.

Keywords: agarwood, β-glucuronidase, onion epidermis, transgenic Arabidopsis plants.

Received: April 27, 2020; Revised: September 25, 2020; Accepted: September 29, 2020; Published online: March 29, 2021  Show citation

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XU, Y.H., LV, F.F., SUN, P.W., TIAN, M.H., & WEI, J.H. (2021). Cloning and functional analysis of the promoter of the sesquiterpene synthase gene ASS1 in Aquilaria sinensis . Biologia plantarum65, Article 60-67. https://doi.org/10.32615/bp.2020.141
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