| Title: | The R2R3-MYB transcription factor OfMYB21 positively regulates linalool biosynthesis in Osmanthus fragrans flowers |
| Author(s): | Lan Y; Zhang K; Wang L; Liang X; Liu H; Zhang X; Jiang N; Wu M; Yan H; Xiang Y; |
| Address: | "Laboratory of Tree Genetics and Molecular Breeding, School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China. National Engineering Laboratory of Crop Stress Resistance Breeding, College of Life Sciences, Anhui Agricultural University, Hefei 230036, China. Laboratory of Tree Genetics and Molecular Breeding, School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China. Electronic address: xiangyanahau@sina.com" |
| DOI: | 10.1016/j.ijbiomac.2023.126099 |
| ISSN/ISBN: | 1879-0003 (Electronic) 0141-8130 (Linking) |
| Abstract: | "Osmanthus fragrans is a well-known landscape ornamental tree species for its pleasing floral fragrance and abundance of flowers. Linalool, the core floral volatiles of O. fragrans, has tremendous economic value in the pharmaceuticals, cleaning products and cosmetics industries. However, the transcriptional regulatory network for the biosynthesis of linalool in O. fragrans remains unclear. Here, OfMYB21, a potential transcription factor regulating the linalool synthetase OfTPS2, was identified using RNA-seq data and qRT-PCR analysis. Yeast one-hybrid, dual-luciferase and EMSA showed that OfMYB21 directly binds to the promoter of OfTPS2 and activates its expression. Overexpression of OfMYB21 in the petals of O. fragrans led to up-regulation of OfTPS2 and increased accumulation of linalool, while silencing of OfMYB21 led to down-regulation of OfTPS2 and decreased biosynthesis of linalool. Subsequently, yeast two-hybrid, pull-down and BiFC experiments showed that OfMYB21 interacts with JA signaling factors OfJAZ2/3 and OfMYC2. Interestingly, the interaction between OfMYC2 and OfMYB21 further enhanced the transcription of OfTPS2, whereas OfJAZ3 attenuated this effect. Overall, our studies provided novel finding on the regulatory mechanisms responsible for the biosynthesis of the volatile monoterpenoid linalool in O. fragrans" |
| Keywords: | *Transcription Factors/genetics/metabolism *Saccharomyces cerevisiae/metabolism Acyclic Monoterpenes Flowers/genetics Floral scent MYB transcription factor Osmanthus fragrans; |
| Notes: | "MedlineLan, Yangang Zhang, Kaimei Wang, Linna Liang, Xiaoyu Liu, Honxia Zhang, Xiaoyue Jiang, Nianqin Wu, Min Yan, Hanwei Xiang, Yan eng Netherlands 2023/08/06 Int J Biol Macromol. 2023 Sep 30; 249:126099. doi: 10.1016/j.ijbiomac.2023.126099. Epub 2023 Aug 4" |
