Abstract
Dragon’s blood is a traditional medicine that is produced mainly from Dracaenas plants and is widely used in the world. The main chemical compounds in dragon’s blood are flavonoids. Flavonoid 3′-hydroxylase (F3’H) is an enzyme that synthesizes 3′-hydroxylated flavonoids. DcF3’H plays a vital role in determining the flavonoid content during the production of dragon′s blood; however, the regulation of DcF3’H expression in Dracaenas plants is poorly understood. In this study, a 759-bp promoter region of DcF3’H was isolated from Dracaena cambodiana. The promoter sequence contained cis-acting elements related to various environmental stresses and hormones responses. Dual-luciferase assays showed that the DcF3’H promoter was up-regulated by 6-benzyl aminopurine (6-BA) and down-regulated by methyl jasmonate (MeJA), and these results were consistent with transcription levels of DcF3’H in stems that were verified by quantitative real-time PCR (qPCR). DcHLH1, a bHLH transcription factor identified in yeast one-hybrid screening, was capable of both binding to the promoter and activating the transcription of DcF3’H by ~10-fold. The results provide new insights into the regulatory mechanisms of DcF3’H in Dracaena cambodiana.
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Abbreviations
- F3’H:
-
Flavonoid 3′-hydroxylase
- 6-BA:
-
6-benzyl aminopurine
- MeJA:
-
methyl jasmonate
- TSS:
-
transcription start site
- ABA:
-
abscisic acid
- SA:
-
salicylic acid
- IAA:
-
indole-3-acetic acid
- ETH:
-
ethylene
- GA3:
-
Gibberellin A3
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 81773845), Central Public-interest Scientific Institution Basal Research Fund for Chinese Academy of Tropical Agricultural Sciences (1630052016002) and Innovation Research Group Program of Hainan Province Natural Science Foundation (No. 2017CXTD020).
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Communicated by: John J. Riascos
Jiahong Zhu and Pan Chen are co-first authors
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Zhu, J., Chen, P., Guo, D. et al. Identification and Functional Characterization of the DcF3’H Promoter from Dracaena cambodiana. Tropical Plant Biol. 11, 192–198 (2018). https://doi.org/10.1007/s12042-018-9211-5
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DOI: https://doi.org/10.1007/s12042-018-9211-5